3ROAOCAST Feb. W R NY 2 Gents 1 STATION

oar

,pá / ,i.

I F

,

fr.

MOTOR WHIP FOR ICE SKATERS See Page 881)

EXPERIMENTéR PUBLISHING COMF ANY, NEW, YORK; PUBLISHERS OF RADIO NEWS -.RADIO LISTENERS' GUIDE -FRENCH HUMOR- . AMAZING STORIES This onderlf D L,,_ Sent .-- - On . Wi11 Trial , ; - You ' . a Craftsman Oily

- 11OQ0\nowx

% ty.

t

` .

a ,

A Complete Set of Craftsman's Home Working Tools Red Jacket electrically driven tools turn out work like magic. A complete made to order workbench equipment of perfect, efficient and powerful craftsman's tools that are small and com- pact enough for portable use and so inexpensive that any man or boy may have one. ed Jacket free free Waco CRAFTS BLU E Craftsman's Lathe c RED JACKET-A chest full of tools designed by a COURSE PRINTS master for the private use of tool lovers and men who want to build, construct, invent and create at .- home. You will be able to make everything- Special Crafts Course FREE attractive odd furniture, toys, home and garden im- SPECIAL CRAFTS COURSE and provements, all around manufacturing, repairing. Blueprint service is free to Red Turning Sawing THE COMPLETE EQUIPMENT consists of a Jacket Shop owners-all that there Winding powerful is to know about handicraft Spinning Red Jacket Drill Motor, with direct drive Grinding to the Waco precision wood turning lathe (capacity methods, raw materials, woods, Bulling x carving, sawing, Polishing 9 in. 34 in.); a bench saw, that has depth and side turning, designing, Cabinet gauges, scroll and jig saw; and all accessories for carpentering, decorating, is taught Slaking special Scroll both portable and stationary power drilling, buffing, by correspondence. Sawing grinding and cleaning. Drilling Attaches to any light socket Repairing and converts your work bench into a complete pri- The Waco GUARANTEE Dove- tailing vate tool and machine shop. If It Is Not What YOU Want When Pointing You Get It-Send It Back Jointing Buy On Your Own Terms : Sharpening 1 Sanding Only $10.00 down. Liberal discounts I Look Scratching out for imitations. There Carving for cash. Easy monthly payment is only one Red Jacket-one Waco plans. is no hardship Successful It to own a -one Wm. L. Aylward, Master - Master- Red Jacket. \s craftsman. pieces SO DAYS' FREE TRIAL -e r Our literature tells you how to This Headstock start a job of your own. If you furnished where WACO TOOL WORKS, Inc. are not pleased return the no electricity is 542 N. Parkside Ave., Chicago Shop. available. Manager, Dept. 201. Please send me particu- Interesting lars about 10 -day free trial, free blueprints, and Literature Free $10 down payment. Send the coupon. You will be surprised with all it contains. Beautiful, Instructive, Fascinating, In- teresting. Name Address Science and Invention for February, 1928 873

Drafting, Lessonsd

tf

.. ".Leearrow . ?A.... -ái:f.. ._ ~Si

Yee to prove you can learn at Home, in spare time! We have developed a new simplified, rapid an way to teach Drafting, and we want to send you Home-training backed with three sample lessons without cost or obligation. So agreement to get you a you can test your own ability to master this fascinating work at home, in your spare time. And see DRAFTING JOB at a 50% RAISE for yourself how quickly and easily you can qualify for -or money refunded a fine, well -paid Dra`ting position. Here is a word-for-word copy of the Contract which to we have made with 30,000 men in the past three $50 to $125 a week paid years. I shall be glad to make the same agreement, DRAFTSMEN backed by our entire resources of $1,500,000.00- EXPERT with YOU! Pick up the want ads of any big -city news- paper and you'll see why we urge men to go Come '115. into Drafting. 70,000 fine positions advertised Into Drafting! in the past year. Draftsmen are urgently The ability to read blue- pri nts and draw plans is needed in Building Construction, Manufacturing, in the entering wedge to Electrical, Structural success in all building the Architectural, Mechanical, and manufacturing and Automotive industries. Get in touch with me, and ) lines. Learn Drafting jobs. and you'll be "sitting I'll tell you how you can get one of these fine It'wsINTorkER- ESrettyyNGTI and The American School of Position and 2= Draftsmen are a won- Guarantee derful bunch of fel- Chartered 30 years ago as an ED- 'l lows. You're bound INSTITUTION, Increased Pay toenjoythegood-. UCATIONAL natured atmos- and, like the best resident schools To-- - -- phere of a and colleges, conducted NOT FOR -- office PROFIT. We offer complete, thor- igj WE GUARANTEE to find you a satisfac Drafting you fin and the con- ough. up-to-date instruction-pre- I tory position within 60 days alter tact it gives pared by 200 leading Engineers. 'sh our complete course of home training in you with im- A Drafting; portant ac- Executives and Educators. tivities and unique instruction, built to meet 111 And, further, 14-5 BIG MEN. the specifications of well -paid jobs as laid down by employers them- WE GUARANTEE that midposition will selves-yet simplified for ready R 4 pay you a salary of at least 50`. more than by men with only J3 you are earning today. provided your present understanding is less week; common schooling. salary than S40 per - 4.1 And we are the first in the home OR FAILING TO DO SO. we guarantee to study field to recognize the need of {$) refund to tint immediately the entire amount giving a COMPLETE SERVICE that you have paid for this training. to ambitious men-training plus employment. Which takes you as you are, supplies the equipment you lack, and lands you in the better O. C. MILLER job you seek. Without risk to you I Director Extension Work ,455okkW11.7f.:1V 11,y r.'It;5".?,Wek-eff:riffle O. C. MILLER, Director, Extension Work, The American School This agreement proves our training does make real Draftsmen. It proves that after you Dept. D.226 Drexel Ave. 6t 58th St.. Chicago finish,lhere are well -paid jobs available. And you can prepare yourself without losing a I am interested to get particulars of your Job and Raise Guarantee. Also or leaving day's pay or time, without quitting your job hornet send 3 Drafting Lessons without cost or obligation.

Name ciiooi Address Age Occupation Árataxican'"Dept D226 Drexel ..venue d 58th Street, Chicago 41tn and enton

Vol. XV Formerly ELECTRICAL Whole No. EXPERIMENTER ri8 COMBINED WiTH "THE EXPERIMENTER" Member Audit Bureau of Circulations EDITORIAL. ADVERTISING AND GENERAL OFFICES: 230 Fifth Avenue, New 1 ork City Published by Experimenter Publishing Company. Inc. (II. Gernsback, frig.; S. Puaosue,a of SCIENCE AND INVENTION, RADIO Gernsback, V -Pros. and Treas.) NEWS. RADIO LISTENERS' GUIDE, AMAZING STORIES and FRENCH HUMOR.

Editorial Staff Contributing Editors HUGO GERNSB:SCK, Editor -in -Chief. Astronomy- Automotive Subjects- George A. Leers II. \VINFIELD SECOS, -1ian:aging Editor. Dr. Donald H. Alonzo], Ph.D., Liek Observatory; W. J. Lumen, of T. O'CONOR SLOANE, PH. D., the Harvard College Observatory. Radio- A. P. Peck, Herbert Hayden. Associate Editor. Entomology and Allied Subjects- Magic and Psychic Phenomena- lie. Ernest liado, Ph.D. Joseph Dunninger, Joseph F. Rion. Edward Merlin. TosEºII Ii. KRAUS, Field Editor. 1'hysics- Foreign 1'AUI. \VF.LKER, Correspondents- Radio Editor. Dr. Darold F. Richards. Ph.D., Ernest E. Chapin. Dr. Alfred Grademvitz, Germany; Dr. H. Becker. S. GrRNSSACK. Wrinkles Editor. M.A.. Ur. Donald R. Menzel, Germany; C. A. Oldroyd, England; S. Leonard Bas- Chemistry- tin, England; Count A. N. Mirzaotr, Franco; Hubert \V. J. ROMAINE, 8louka, t Art Director. Raymond 1;. Wailes, zecho-$loralda; P. C. san Petegem, Hol- Dr. Ernest Dade, Ph.D. land; Millard Neumann, Austria.

IN MARCH ISSUE CONTENTS OF THIS NUMBER Tail -Spin Eliminated! Editorial 883 Alarm Clock Case from Wall Board 906 It is believed that the brave By Hugo Gernsback By H: L. Weatherby Science in a New Theatre fliers who lost their lives in an 884 Model Dept.-" Wa-hoo"-Speedy Cruiser By Joseph H. Kraus Wins attempt to span A Cup 907 the Pacific Motor -Whip for ice Skaters 886 Experimental Chemistry Ocean were the victims of tail- By ilugo Gernsback and Electrics 909 Testing I:iectric Edited by Dr. T. O'Conor Sloane spins. This article will, there- Machinery in liege Pit 888 Locomotives-Old and New 889 Constructor Dept.-Building an "Electric fore, be of extraordinary in- Man-made Storm Ventilates Iludsan Auto Bull," for Lodge Entertainment 911 terest to Tube Magazine Mysteries 912 everyone. 890 By Pendulum Locates Oil Deposits 891 Bert Douglas Hobbies of Famous Men Ry S. R. Winters Making Prince Rupert's Drops 913 No matter how famous a man Television May Solve Star Secrets 892 By Raymond B. Wailes or By Donald H. Menzel, Ph.D. A Duplex woman becomes, invariably Lick Observatory Phonograph 913 we find How -to -Make -It Department 914 that they have a hobby. The Flying Piano ' 893 Readers' Forum By H. Winfield Secor 915 Cities in Miniature The Metal Wrinkles, Recipes and Formulas 916 Emperor -5th Installment 894 Edited by This article gives many con- By .4. -Merritt S. Gernsback Scientific Progress Radio Dept.-Horne Broadcasting a New structional hints, and shows 896 Pleasure how marvelous miniature repro- A Rotary Valve Auto Engine 898 917 Glands Make Giants-Not Prizefighters 899 By Paul Welker ductions of buildings, trams, By Frederic Damrau, M.D. New Radio Devices of the Month 918 trees, et cetera, are built. Enlarging Photos by Stretching 900 SCIENCE AND INVENTION Three -Tube D.C - Gas Detector for Miners 901 \.C. Set 919 A Students New Super -Het. Study Electrical Refrigeration 901 The llayden De Living Plants in Luxe Super-Building the New radio sets may come and Sealed Containers 902 Power Pack 920 By Joseph H. Kraus Radio Oracle go, but the super -het of efficient Motor hints 923 903 Scientific Humor 924 design still retains its prestige. by George A. Leers Conducted latest Patents 925 The one to be described in the Can You Answer These Scientific Ques- oracle tions? 926 March number has super-selec- 904 PatentAdvice 934 Magic-.\ Monthly Feature 905 Book Review tiv:ty and range. Ry 954 Dnutniuger Radio Wrinkles 962

now To RtiRSCRiiE FOR "SCIENCE AND INVENTION." Send your name. address and remittance to Experimenter Publishing Co.. 230 Fifth Ave.. New York Cit Checks and money orders should he made payable to Experimenter Publishing co.. Inc. publish RADIO NEWS, AMAZING STORIES, R.LDIO LIS'1'NliRS' Mention magazine desired. Inasmueh as wo also GUIDE and FRENCH Hl'\IOR, a weekly. Rubscrintlnits may be htnatlnn with the other puhllrntlnns lust mentioned at special reduced club rates. Send made In com- Ex RAT ibshti for nub rate card. Subserlptiona start with the current Issue unless otherwise ordered. ON pi ION of your subserint ion we enclose a renewal blank by -In our list number to you, and notify you mall. 'then, unless we reecho your order and remittance of a renewal, zine is stopped. delivery of the maga- SCIENCE 4ND IX ENTION is pr+bltshed on the 10th of each month. There are :2 numbers per year. Sub- scription prlee is $2.50 a year In I'. S. and possessions. Canada and foreign countries. a U. S. robs as well as U. S $3.00 year. stamps accepted (no fnrelgn coin or stamps). Single copies, 25c each. All enmmunleallons and contributions to this journal should be addressed to Editor. SCIENCE 230 AND INTEN- TION. Fifth Ave., New York City. N. Y. Unaccepted contributions cannot be returned unless f ll postage has been Inrtuded. ALL accepted contributions are wdd for on rublicalloh. SCIENCE AND INVENTION Monthly. Entered as second-class matter May 10. 1924. at the New York. N. Y.. Post Office at under the art of March 3, 1879. Additional entry at Uunellen, N. J. Title Registered at the Patent office. Copyright. 1920. by E. P. Co.. Inc., New York. The Contents of this Magazine are copyrighted and must not be reproduced without gising full credit to the publl- cotion. SCIENCE AND INVENTION is for sale at all newsstands in the United States and Canada. European Agente. S. J. Wise Et Cie. 40 ,Piare Verse, Antwerp, Belgium. ADVERTISING REPRESENTATIVES L. F. McCLURE, 720 Cass St.. Chicago, III.; DAVIES. DILLON Sr KELLY. 15 West 10th St.. Kansas City Mo.; T. F. M-\OltANE, Roston. Mass.: Park Situare Bldg, HAUNTIs. hYDE, 548 Drexel Itldg., Philadelphia. Pa.; A. .1. NORRIS DILLCO.. 5 Third Si,, San Francisco, Calif.. 412 West lith St.. Los Angcles, Calif.; Leary Seattle. Wash. Itldg.,

A ITANDY RULE FOR YOU

¡liullli I I I ulllhillIli9llliIFIIljIlIt(IFIIIIllllll

I;iT 1 2 3 4 5. 6 7 8 9 10 11 13 14 15 CENTIMETERS 1I 2I 31 4 6 INCHES 7 Illlllllllll j1L111111111111111111 llllllll1111 III'j 1111111 1111111 111 1111!111111 1174 Science and Invention for February, 1928 873 This Singular Book Wields a Strange Power Over Its Readers Giving them a MAGNETIC PERSONALITY almost instantly//

°'- ,. ,I1/ii ' _ =.-Qn,.R,t,t

,ffTI-11111 Will You Read It 5 Days FREE --to Prove It Can Multiply Your Present Income? ASTR.' N GE book! t book that seems transforming people into entirely new beings! What Others Say ' to cast a spell over every person who Quietly, almost secretly, Shaftesbury's turns its pages! fame spread. Great men came to him. His What priceless benefits! So profound! So A copy of this book was left lying on a students and friends embraced such names far-reaching! Is it any wonder that thousands hotel table for a few weeks. Nearly 400 as Gladstone, Queen \ ictoria, Edwin Booth of men and women say that they are over- people saw the book-read a few pages- Henry Ward Beecher, Cardinal Gibbons, and joyed with the results they have received? and then sent for a copy! others of equal fame. One enthusiast said of this volume, "Things In another case a physician placed a copy Until recently, Shaftesbury's teachings I have read there I would never have dreamed on the table in his waiin -roofn. More than have been available only to people who of." Another wrote, "Certainly wonderful; 200 of his patients saw the book-read part could pay $25 or $50 each for instruction like walking up a stairway to a higher life." of it-and then ordered copies for themselves! books. But now, through the efforts of a Another w rote, "I would not gi e up what NChv are men and women so profoundly group of his students, his wonderful teach- Shaftesbury has taught me for $100,000!" affected by this book?-so anxious to get a ings have been collected into a single volume, Its your everyday life-in social life-and especially copy. The answer is simple. The book re- at a price within the reach of all! Ind further- in business, you will find what those people say to be them for the first time how any has consented reveal true. You will find this book of immense value. You veals to more, Shaftesbury to will quickly learn to fascinate people you meet-to man or woman-old or young-can develop hundreds of new discoveries never before put attract new friends-to gain the speedy promotion a Magnetic Personality instantly! It ex- into print. and big pay which always como to men and women to personal who have developed that most wonderful of all quali- plains how gain overnight the ties-a MAGNETIC PERSON 1LITY! charm that attracts countless friends-the Strange Effect on Readers self-confidence that insures quick success 5 in any business or profession. Readers of this book quickly become Read This Book Days Free masters of a singular power to attract others- It tells how to draw people to you at once, You must see this book for yourself-examine it- irresistibly-how to be popular everywhere, to influence men and women around them. let it influence indelibly your own personality. Merely in any society-how to overcome almost at Not by force-not by loud argument. Bttt mail coupon below and this remarkable volume, with rather by some subtle, in- cover in handsome dark burgundy cloth, gold em- once any timidity or self-con- bossed, will be sent you by return mail for 5 days' sciousness you may have- sinuating power that sways free examination. If you aren't stirred and inspired how to he a magnet of Book Tells You men's minds and emotions. in the 5 -day free period, return it and it coste you They are able to play on nothing. Otherwise keep it as your own and remit human attraction, popular How to develop a Magnetic the Special Price of only $3 in full payment. This and well -liked wherever you Personality people's feelings just as a volume was originally published to sell at $5-but in How to use Certain Oriental go! skilled violinist plays upon a order to reach as many readers as possible-it is Secrets violin. being offered at this special reduced price. This offer It not only tells exactly How to gain perfect nerve may never appear again, so you are urged to act at how to accomplish these control Folks are never the same once, before it is withdrawn. Remember-you do How to .gad people's feelings after reading book. not pay unless you decide to keep the book. You risk things-it tells you how to by watching their mouths this Their manner changes. The nothing-so clip and mail this coupon NOW. Ralston accomplish them without How to read people's University Press, Dept. 30-B, Meriden, Conn. delay-instantaneously! thoughts by watching tone of their voice, the expres- their eyes sion in their eyes-yes, even How to develop a magnetic Whence Comes This eye their actual features seem RALSTON UNIVERSITY PRESS, Volume? How to make your face ap- to change-seem to grow Dept. 30-B, Meriden, Conn. Uncanny pear 20 years younger more cultured, more re- How to control others by a fined. All right-I'll he the Judge. You may send me the Forty years ago, Ed- glance volume -Instantaneous Personal Magnetism" for 5 days' mund Shaftesbury, famous How to use Magnetic Heal- The eyes-windows of the FREE Examination In my home. Within the 5 days I student of the human mind, ing soul-become clear, beauti- will either remit the special low price of only S3.00 In full How to end awkwardness payment. or return it without cost or obligation. set out to discover the secret and timidity ful, expressive, luminous as of that rare quality-Mag- How to attract the opposite a crystal sphere. The netic Personality. Ile first sex voice grows rich, resonant- Nme How to get ahead in your applied his discoveries in his business or profession mellow as a golden bell. listen own circle of friends. Results How to make your subcon- Folks spellbound- Address were astonishing! His scious mind work wonders charmed by the fine modu- And dozens of other vital methods seemed to have the topics lations-the cultured fluency power of almost instantly of the tones. C!ty State 876 Science and Invention for February, 1928 INDEX TO ADVERTISERS

PAGE PAGE PAGE A E PAGE LaSalle Extension University 950 Polachek Z. American Auto & Radio Mfg. Electro Magneto Tool Co 881 Lederer School of Drawing 962 Polk H936 & Co., R. L Co. 946, 954, 957, 960, 957 964 Electro Thermal Company, The 932 Leonard, \. 0 960 Popular Chemistry 946 American Chime Clock Company 941 Evans & Co., Victor J. 937 LePage's Craft League 931 Press Guild Inc American Detective 955 Ssytem 942 F Liederman, Earle E 965 Publishers Classified Service, American Finance & Develop- Loftis Brothers & Company Fanspeaker 953 The 963 ment Corp. 936 Radio Co. 954 Mc American School 873, 956 Farmer Burns School of Wrest- R American School of Aviation 953 ling 952 McGraw-Hill Book Co 933 1ticSneeney Radio Association of America 961 American School of Music 942, 951 Fawcett Publications, Inc. 927 Electrical Schools 961 Radio Ferry & Company Institute of America 961 American School of Photography 946 953 M Radio Power Company. American Telephone & Telegraph First Ilawaiian Conservatory of 962 Maxson, F. P 965 Radio Specialty Company 929 Co. 941 Music, Inc. 953 Metal Arts Ralston University Fisher Mfg. Co., Adam 936 Company, The....., 951 Press 875 Anita Company 951 Metal Cast Products Company Randolph & Company Audel & Co., Theo. Franklin Institute 945, 950 958 934 Midwest Radio Corp n 945 Ray Laboratories 957 Inside Back Cover G Miller, Monroe E Ross -Gould Automatic Rubber 934 Company 961 Co. 962 Gaston Manufacturing Company Milwaukee School of Watch Royal Novelty Company Aviation Institute of U. S. A 950 940 956 Gerold Company 960 Repairing, The 960 Royal Sales Company 965 B Gilson Slide Rule Company 965 Miniature Ship Models. Inc 880 Givens, E. Movie Operators S Balda Art Service S. 964 School 950 958 Greer College of Munn & Company 934 School of Engineering of Bathe Manufacturing Company 960 Automotive Engineering 951 N Milwaukee 949, 959 Bell Perfume Company 943 Self -Improvement Blancke Auto Devices H National League of Co 936 Automotive & Electrical America 882 Bliss Electrical School 948 Hardin -Lavin School Company 948 961 Shure Radio Company 959 Boeing, M. L. 951 Hamilton -Carr Radio National Cigar Company Corp. 964 960 Sinclair, James 960 Bryant & Lowry 936 Haywood Tire Company 959 National Radio Institute 879, 955 Standard Business Training Buescher Band Instrument Co 930 National School of Iligh School IIome Study Bureau 962 Cartooning.. 964 Institute 959 Bureau of Inventive Science 936 Hobart Brothers Company 947 National School of Watchmaking 938 Stanley Nestles' White Correspondence Iloenack Paul 936 Rubber Fusing Com- School of Magic, The C Holton Company, pany, Inc. 952 Frank 960 949 Strongfort Institute 939 Carlson Cartoon Service 960 I New Age Illustrated 968 Cervenec System, A. S 951 New Method Mfg. Co 949 T Ideal Aeroplane & Chemical Institute of N. Y 878 Supply Com- New \ork Electrical School 943 Tamblynt F. W Chicago Correspondence School pany 928 New York Institute of Photog- Tarbell 948 Inkograph Company, The System, Inc 957 of Music 954 raphy 959 Treasure Sales Chicago Solder Back Cover No -Frost Company 951 Company 948 Company, The 941 Trilety, M. 949, Clarkson, David B 964 International Accountants So- North American School of 961 Coleman, Watson E ciety 956 Drawing u 936 International 945 Conn, Ltd., C. G 954 Club 961 Norton Institute 954 United Electric Motor Company 959 Consrad Company International Correspondence Universal Plumbing School Schools ...... 938, o 953 876, 942, 946, 950, 952, 958, 961 952, 958, 964 United Scientific Laboratories 947 Irin Aircraft Company 949 O'Brien Clarence A 935 U. S. Cox, S. J 936 Ogilvie Publishing Swiss Agents957 Coyne Electrical School 877 K Company -938, 964 V G. A Owen, Richard B 934 Culver, 944 Kelly, T. W. 943 VanDeventer, II. R 936 Curtatt-Quickstart Co. 961 P Kelsey Company, The 936 Cushing, H. C., Jr 964 Parks Woodworking w Kitchin, Edgar \I 936 Machine Waco Tool \\-orks..Inside Front Cover D L Company 949 \1 ashington School of Cartoon- Pathfinder Publishing Company 960 ing David, Charles 965 Laboratory Materials Company 957 Perfect Penmanship 940 Douglas. Lyle Institute 964 \\'ashington Show Card School 942 942 Lacey & Lacey 936 Plymouth Rock Squab Company 956 Whirlwind Dryer, Prof. J. A 957 Lancaster & Allwine 936 Pohl Brothers Carburetor Company 959 959 Wood Memorial, Leonard 940 BUILD THE PERIDYNE WHAT RADIO NEWS SAYS ABOUT THE "PER IDYNE"

RADIO NEWS says:

The "Peridyne" receiver is revolutionary. It embodies an entirely new principle in what we have named the "Peridyne" method of shield -tuning. A new radio symbol, the "Peridyne" character, had to he created by the author, as no symbol for this arrange- ment is provided in the present radio practice. We great predict commercial possibilities for this invention ; which makes it possible to bring a single dial into resonance set perfect interstage and consequently to operate it at the maximum possible efficiency. The "Peridyne 5," a receiver you can easily build yourself, is a five -tube set, by means of which the author in New York receives Pacific Coast stations several times during the week, even during the summer. RADIO NEWS further says: The "Peridyne 5" is the greatest 5 -tube DX set that has ever been described, anywhere. Use the Official Construction Booklet on this Circuit containing elaborate Booklet with full instructions and full size Blueprints of all Parts. PRICE 50c

CONSRAD CO., INC. - 230 Fifth Avenue, New York Veicnce and Invention for February, 1928 877

u ' t t . , r r -= J r' p.p

tw'r 1 ,r <

o

A Glimpse Into the Coyne Electrical School f Those who see the great roaring shops of Coyne from doorbells to farm power systems. Here, with for the first time are amazed. Itere are students from this full-size machinery In full operation every day. every State in the Union working on the greatest Coyne students get years of experience In a few outlay of electrical apparatus ever assembled In any months. Here-and nowhere else In the world- school ... costing hundreds of thousands of dollars can you get such training? r real dynamos, huge motors, actual skeleton The photograph above Is one of 150 views In our 1 houses, complete power plants, transmitting sta- catalog, a copy of which will be mailed free upon , I See below. tions, switchboards of all kinds . . . everything request. coupon ELEcT;,U :cITY./ On Actual Electrical Machinery -In 12 Weeks By Actual Work-in the Great Shops of Coyne SOME kinds of jobs ought to be labeled with a big sign that says "Man - No Advanced Education or Experi- killer." They are either so heavy, dirty and hard that they sap a man's With a personal, practical method like strength and keep him dog-tired all the time-or else they are so dis- ence Needed this, is it any wonder I say I can make agreeable uninterestin and poorly paid that they kill his ambition in almost You ,I a can have! any man into a practical electrician in 12 happy weeks? no time. And AMBITION is the most valuable thing man don't need a bit of previous experience or advanced education. Many of our most successful graduates are fellows who never Fascinating Work-Real Pay! went to high school and hated ' book -learning." The Coyne That's why so many men are turning to ELECTRICITY, which offers method is different! unlimited rewards and opportunities-with ordinary salaries of $50 a week make up your mind and up! Right now big electrical jobs are actually going begging! Trained Earn While Learning today to get into one of electrical men are in demand-and the need is growing every day! The these real -pay electrical jobs. Electricity is the world's great- situation is one that spells O-P-P-O-R-T-U-N-I-T-Y'in letters a foot high for est industry. Trained men are in demand. At the man who is wide-awake enough to see it! Coyne, you can earn while you Let me make you a practical elec- learn because I help many fel- Learn Quickly trician-the Coyne way. I've done lows to part time jobs where - it for thousandsof others-farmers, laborers, factory men, and they can make most of their Mail This hundreds who haven't had more than 8th grade education! I living expenses while learning! can do it for you-and start you off on the road to indepen- $60 FREE employment service for dence and big earnings in just 90 days! A Week Jobs life after graduation, too. We FREE The secret of Coyne -training is place dozens of men in wonder- Learn by Doing work. No are common in electricity. ful jobs every week 1 that it is PRACTICAL Our free employment BOOK unnecessary theory. In the great shops of Coyne you learn bureau puts you in touch the "ins and out" of Electricity by actual work on real elec- with many openings to Send for Free Book trical equipment-the finest outlay in the country! And best choose from. Our students Just give me a chance to tell you Coupon of all-instructors work right with you every step of the way, get rositions which lead to about the unlimited opportunity that all elec- salaries of $50.00 -- $60.00 awaits you. Let me send you big hook showing you the and up per week. The 150 _ T7u New rrt,000.uio free, containing over Coyne School trical secrets that are es- following are a fewof them: photographs-listing and To day r!/`vision that made him celebrated throughout his long career as a colleco professor. Your NEW YORK instruction from the very beginning is made Interesting and practical, and we supply you Home with apparat:s and chemicals for performing the fascinating analyses and experimental Extension nark that plays such a large in part our method of teaching. and you are awarded the Division 2 Institute's official diploma after you have satisfactorily completed course. / the Experimental Equipment 16-18- S S. 30th St. Easy Monthly Payments NEW YORK CITY Furnished to Every Student You don't have to have even the small price of the course to start. You can Please pay for it in small monthly amounts-so small that you send me at once, We give to every student without additional charge this won't feel them. without any obligation on my The cost of cur course 1s very low, and Includes everything, even ' of the / free chemical equipment. including forty-nine places labora- aro part, your (took "Opportuni- and chemicals chemistry outfit-there no extras to buy with our course. Our plan ties for tory apparatus and supplies, forty different of a Chemists." and full par - and chemicals monthly payments placee chemical education within the reach of doliars about and reagents. These comprise the apparatus Write us and us ' the Experimental Equlp- everyone. let explain our plan used for the experimental cork of the course. The fitted In full-give us the meet giren to every student. Also please opportunity of showing you bow you can qualify for a I tell me heavy wooden serves not only as a Case for the outfit highly trained abort your plan of box technical position without crop giving up your payment and bet also es a useful laboratory accessory for performing present employment.'' the reduction In the tuition price. countless experiments. TUITION PRICE REDUCED Besides furnishing the student with his Experimental; 24-1y1E Equipment, wo hare been able, through the big Increase INSTITUTE in our student body, to redu,e the coot of the course. CHEMICAL Write (relay for full information anal free book, "Op- portunities for Chemists." Send the coupon right 'ADDRESS OF NEW YORK, Inc. now, while 1t le fresh in your mind. Or just write your name and address on a postal and Home Extension Division 2 mail It to us. 16-18-a E. 30th Street NEW YORK. CITY DON'T WAIT-MAIL COUPON NOW! CITY STATE ... S. & 879 Science and Invention far February, 192R

Always outside of things- that's where I was just twelve short months ago. I just didn't have the cash, that was all. No theatres, no parties, no good restaurants. No real enjoy- ment of life. I was just getting by, just existing. /Yhat a dif- ference today! I drive my own car, have a good bank account, enjoy all the antusentents I please.

I Couldn't Get the Good Things of Life Then I Quit My Job and "Found" Myself

a very small unfurn- low some other line of Radio besides building my HOW does a man go about making more 1: I figure you can afford own retail business, such as broadcasting, manu- money? If I asked myself that question ished apartment, make your payments on enough fix such an apart- facturing, experimenting, sea operating, or any once, I asked it a hundred times! plain, inexpensive furniture to water bills, one of the score of lines they prepare you for. And I know the answer now-you bet. I know the ment up, pay your electricity, gas and for to think that until that day I sent for their eye- way good money is made, and I'm making it. buy just about one modest outfit of clothes a opening book, I'd been wailing "I never had a Gone forever are the days of cheap shoes, cheap both of you once a year, and save three dollars clothes, walking home to save carfare, pinching week for sickness, insurance, and emergencies. chance!" pennies to make my salary last from one pay-day But you can't eat. And you'll have to go without Now I'm making real money. Louise and I to the next one. I own one of the finest Radio amusements until you can get a good substantial have been married six months, and there wasn't stores you ever saw, and I get almost all the raise in salary." any kidding about budgets by Mr. Sullivan when Radio service and repair work in town. The other I began to burn red as fire. we stepped off, either. I'll bet that today I make he said, Radio dealers send their hard jobs to me, so you "That budget isn't so good after all," more money than. the old boy himself. Budget No. 2 will can see how I stand in my line. glancing at me; "maybe Here's a real tip. You may not be as bad off as But-it's just a year ago that I was a poorly - sound better-" I was. But, think it over-are you satisfied? Art I said. "Have paid clerk. I was struggling along on a starvation "That's enough, Mr. Sullivan," you making enough money, at work that you see things pretty clearly now; salary until by accident my eyes were opened and a heart. I can like? Would you sign a contract to stay where before. Let me I saw just what was the matter with me. Here's things I was kidding myself about you are now for the next ten years, making the I went, the story of just how it happened. go home and think this over." And home same money? If not, you'd better be doing some- my mind in a whirl. thing about it instead of drifting. life had come. I One of the big moments of my This new Radio game is a live -wire field of At home I turned the problem over and over in hat just popped the fatal question, and Louise rewards. The work, in any of the 20 dif- my mind. I'd popped the question at Louise on golden said "Yes!" ferent lines of Radio, is fascinating, absorbing, impulse, without thinking it out. Everything Mr. Louise wanted to go in and tell her father about well paid. The National Radio Institute-oldest when had said was gospel truth. I couldn't it right away, so we did. He sort of grunted Sullivan and largest Radio home-study school in the world see anything to do, any way to turn. But I had we told him the news, and asked Louise to leave train you inexpensively in your own home looked to have more money. -will us alone. And my heart begin to sink as I to know Radio from A to Z and to increase your I began to thumb the pages of a magazine at his face. earnings in the Radio field. "So you and Louise have decided to get mar- which lay on the table beside me. Suddenly an leap at my Take another matter what your plans ried," he said to me when we were alone. "Well, advertisement seemed almost to out tip-no are, no matter how much or how little you know Bill, just listen to me. I've watched you often eyes, an advertisement telling of big opportuni- the great new about Radio-clip the coupon below and look here at the house with Louise and I think you are ties for trained men to succeed in the advertisement was a cou- their free book over. It is tilled with interesting a pretty good, upstanding young fellow. I knew Radio field. With I facts, figures, and photos, and the information it your father and mother, and you've always had a pon offering a big free book full of information. received a will give you is worth a few minutes of anybody's good reputation here, too. But just let me ask sent the coupon in, and in a few days in colors, time. You will place yourself under no obligation you just one question-how much do you make?" handsome 64 -page book, printed two in the Radio book is free and is gladly sent to anyone "Twenty-eight a week," I told him. telling all about the opportunities -the prepare quickly and who wants to know about Radio. Just address He didn't say a word-just wrote it down on a field and how a man can of these oppor- J. E. Smith, President, National Radio Institute, piece of paper. easily at home to take advantage and when I Dept. 2T, Washington, D. C. "Have you any prospects of a better job or a tunities. I read the book carefully, good raise some time soon?" he asked. finished it I made my decision. "No, sir; I can't honestly say that I have," I What's happened in the twelve months since admitted. "I'm looking for something better all that day seems almost like a dream to me now. J. E. SMITH, President, a Radio the time, though." For ten of those twleve months I've had National Radio Institute, I Dept. 2T, Washington, D. C. eh? How do you go about it?" business of my own! At first, of course, started "Looking, Dear Mr. Smith: Well, that question stopped me. it as a little proposition on the side, under the Please send me your 64-page book, printed in two a job guidance of the National Radio Institute, the in- How did I? I was willing to take better colors, giving all information about the oppor- gave me my Radio training. It if I saw the chance all right, but 1 certainly had stitution that tunities in Radio and how I can learn quickly and so to do in of them. I laid no plans to make such a job for myself. When wasn't long before I was getting much easily at home to take advantage little understand this request places me under no obliga- saw my confusion he grunted. "I thought so," the Radio line that I quit my measly he my tion, and that no salesmen will call on me. he said, then he held up some figures he'd been clerical job and devoted my full time to scribbling at. Radio business. Name "I've just been figuring out your family Since that time I've gone right on up, always at the Address budget, Bill, for a salary of ttsenty-eight a week. under the watchful guidance of my friends I've figured it several ways, so you can take your National Radio Institute. They would have given Town ...... et.,te to fol- pick of the one you like best. Here's Budget No. me just as much help, too, if I had wanted 880 Science and Invention for February, 1928 Build a Ship Model CAN BE PUT TOGETHER BY A SCHOOL BOY ¡N A PEW HOURS --- - L

CONSTITUTION 15 Wins LA PINTA Size: -Year -Old Schoolboy Ship Model Loudspeaker $6.98 26' high: 27' long; 81' wide First Pri:e $12.5 Size: 26' high:27 long; 12' wide A historical ship model should be in every home. We supply be measured in dollars and cents. Boys like to build things all the parts, cut to fit, and ready to put together. Every They learn while they build. part necessary to construct any of the models pictured. A These models, with the exception of the full Constitution, may diagram of numbered parts comes with every kit, with be converted into a beautiful toned loudspeaker that serves a full deta led instructions so that it is impossible to make a double purpose, being useful as well as beautiful. The mainsail mistake. All you need is a small hammer to tap parts in place. acts as the diaphragm, and is driven by a unit of the electro- Here is a part of the instructions copied from the regular sheet magnet type. This is attached to the mainmast, which is im- that comes with every kit. Take part No. 57, place it at the bedded in the hull. Power amplification is not needed, as the front end of No. 56, and down on No. 55. Next take part unit will operate a 72 -in. cone. This assures you faithful No. 58 and place it at the rear end of No. 56, and tap in place reproduction at all frequencies. with a small hammer. These Ship Models are not only for boys, but make a So clear are the instructions that the 15 -year-old boy pictured beautiful gift for everyone. Doctors, Lawyers, Business Men, above won First Prize Nurses, Stenograph- in a model contest ers and Housewives held by the publish- all over the country ers of Science and In- have built models jtl` vention Magazine. from our complete Hundreds of ship kit of parts. They models were entered have become so in- from all parts of the terested in building country. This model the first model that, was constructed from in many cases, they a regular kit of our have sent for the parts. The educa- parts to construct tional and historical all our models, value a boy gains in Ship Model building constructing one of is indeed a fascinat- these models cannot ing pastime.

Sold on money -back guarantee ALL GOODS SHIPPED SAME MAYFLOWER DAY ORDER IS RECEIVED SANTA MARIA Size: Size: $4.98 25' high; 10' wide: 26' long $4.98 25 'high; 11' wide; 27' long..,.

1 MINIATURE SHIP MODELS, Inc., Dept. S-5 When the model is completed it makes one of the finest 3818-20-22-24 Baring St., Phila., home decorations that money can buy, and the adventure Pa. Please send me complete parts, cut to fit and ready to of building own models adds zest for assemble, your to the achieve- the Constitution, 56.94 ; Santa Maria, $4.98 La Pinta, 51.98; ; ment,. You will be proud of your model because you are 0; Mayflower, $1.98 O. Melody Ships: La Pinta, the builder. 812.50 ; Santa Maria, $12.50 O; Mayflower, $12.50 O. I will pay postman purchase price plus postage (a few cents). Check which model you want shipped. Catalog only MINIATURE SHIP MODELS, Inc. Pl.rssi: PRINT N \ND U ./DRESS PLAINLY 3518-20-22-24 Baring St., Philadelphia, Pa. Name Canadian Branch: 1485 Bleury St., Montreal, Canada Street or R. F. D. No. City Canadian Prices Slightly Higher. Send all Canadian Orders to Canadian Office. State Science and Invention for February, 1928 881

. 0 -r-,4001,7--oi N I r

'

-

--ok.' - - .'---...:514' . ' . :', It ' -019-'"iiionnaZ ...- . it .vatavv.1; 111 C

Yours for the Trivial Down Payment We'll show you how to cant or save Asking the small down payments that come due just once a month. So simple too, Everyone who fills in and for any man who knows his ABC's mails the coupon will re- about tools. Ask what 11r. Watts of ceive free of all charge, Miami, Fla. did. Send in coupon today! illustrated plans and in- structions for making Free Trial and this beautiful Priscilla Instruc - Sewing Cabinet. Perhaps tíons-Free Plans you read about it in arecent and Materials issue of a well-known maga- Practical Bench \Ve are Handy Jig Saw I you anxious that every owner of a SpeedWay Saw zine but want to show Shop shall get the maximum pleasure and profit from This Pattern Maker's Built heavy and how to make it in one fourth it. That's why we have established the SpeedWay Jig Saw is part of the strong. Set into place the time on my MOTOR- Personal Service Department. Model "11S" Shop. and operated in five Follows a perfect line. seconds.Rips, mitres, IZED work bench-the- Extra blades included groove., aml cross- Speedway Shop! free. cuts. 24 Blue Prints Free With each Shop we include 24 Blue Prints of Furniture, Discard Your Hand Toys, etc., that anyone can make with 0.1 s:TzP the SpeedWay Shop. Mr. L. L. Hull, in charge of our Personal Service Depart - Tools mein, will answer your special questions. Here is a real Don't let hand tools put a limit service department at your beck and call. on your Craftsmanship. Let me IT show you how to start with this simple Priscilla Cabinet-go on Free Crafts Book into grooving, mitreing, mortis- \\ hen we receive your coupon we will send you a list of the best books on Craftsmanship from which to make your selec- ing, scroll work, wood turning- tion to be sent free with your Shop. make Humidors, Fancy Gateleg Tables, etc. Why limit your in- genuity when it is so easy to own Quick Action Needed Get Your Magazine Basket a SpeedWay Shop? Remember- \Ve cannot continue Special Offers like this indefinitely. Use Quick ! SpeedWay is the Shop used by the coupon today, and we will send the Priscilla Cabinet plans Manual Training instructors and Instructions at once! Mail tray! everywhere. V, hile they last, we , - are giving away the ;- lumber to make the beautiful magazine Motorize Your MAIL TODAY! EVE, basket shown down in thelawer left-hand Workbench he you're getting the right shop when you Electro Magnetic Tool Co., - corner. It is yours You can sure -, Dept. 3-F, " Jr - alone has been serving the World's 1832 So, 52nd Ave., Cicero, to keep even if you realize that SpeedWay Gentlemen: Please send me tree the complete ,"1,401. should deride to re- Industries with Portable Electric Tools for the last plans and Instructions for making the Priscilla turn the Shop. Art twenty years. I want you to examine the exclusive Sewing Cabinet shown above. Also complete details about your Shop at once before they features nf a SpeedWay Shop. Name and tree offers. ." are all gone. In- Street structions for mak- Cite State ing it are included, ELECTRO MAGNETIC TOOL CO. 'sly ase is Occupation of course. 1 will use Shop for at' Department 3.F 1832 So. 52nd Avenue hui CI or prom CI Cicero (Adjoining Chicago> Illinois imow, 882 Science and Invention for February, 1928

. "What Has 'Come Over' Jimmy Smith? ---He's A New Man!" "SURELY that can't be Jimmy By doing a very simple thing you Thousands of men and women of all ages, Smith! What on earth has come can throw off these handicaps suc- the country over, testify in glowing terms to to the wonderful change in their personal S over him? Why, Jimmy used to cess. You can quickly develop the affairs that this remarkable method has be a meek, apologetic sort of chap who delightful poise and self-assurance of quickly produced for them. Self-confidence looked as though he was half afraid a widely -traveled man of the world. quickly developed. Fear and worry banished. of himself. You can be sure of Health improved. Quick promotions. New yourself and able opportunities opened up. Hidden talents "But look at him now!-swinging to meet, talk with, and hold your own developed. Income increased. New, delight- snappily down the street, bubbling with anyone and everyone under any ful friendships formed. And people lifted over with confidence, keen and alert, and all conditions. up from a narrow, monotonous existence dressed in expensi ve clothes, into an expanding, thrilling, joyous life of abounding happiness and wealth. and looking as though he's Amazing Things The Law of Success just come into a million Sent to You FREE dollars. What on earth has That You Can Do The success you achieve, produced this amazing How fo- and the way people treat flow it is' done is told in two delightfully - -increase your income. you, depend upon your per- written manuscripts, entitled "The Great change in him?" Discovery," Secret get ahead quicker. sonal qualities. You get and "The of Life." They -charge yourself with are yours for the asking. They'll show New Thrills For You energy. what you are entitled to you, as they've shown thousands of others, '-use "hidden powers" to have. Water always finds how to win joy and happiness and financial You can imagine the help you m emer- its own level. It's the success greater by far than you ever thought genies. possible. Mail the coupon NOW! The two joyous thrill Jimmy ex- love, same way with win friends, and people. manuscripts will go you immediately, companionship . to perienced as he over- The level, or kind, of free -build Supreme self- of charge or obligation. heard his friends make confidence. qualities you have deter- The these remarks. And later, -develop a charming, mine the success you Self -Improvement League of America when he stopped and told magnetic personality. Suite 714, 75 Westland Avenue, Boston, Mass. -get new, wonderful achieve. People are where them all about it-how he thrills out of life. they are because of what had literally "made him- -know the secrets of joy- they are. That is Natural I self over," and was now a ous health. Law, , -understand the vital facts and there's no get- he 9reat big success. about sex life. ting around it. -overcome fear, discour- % This is a true -life in- agement, worry, ner- Raise the level of your cident, which actually vousness. etc. personal qualities and you happened to "jimmy" automatically raise - in- Smith, who lives in Cleveland, al- crease-your success. People act dif- though, of course, that's not his real ferently toward you-treat you with name. Hundreds of others have done increased respect. Annoyances you THE SELF-IMPROVEMENT LEAGUE it, too. You can do it. You can now have to put up with, vanish. OF AMERICA, actually "make yourself over" in a Bigger opportunities are offered to 1,I Suite 714, 75 Westland Ave., Boston, Mass. I'd like to see your two manuscripts. remarkably short time. Like many you with higher pay and more con- "The Great Discovery," and The Secret of Life." No charge or obligation to me. people, you may be lacking in self- genial surroundings. You are made of course. confidence. Or embarrassed in the happier in every way-actually find Name presence of others. Or of a sensitive, yourself living in a new world. You I retiring disposition that causes you to get higher and better things simply la Street take a back seat while others push them- because you have developed higher selves forward and get ahead of you. and better qualities. I City State Copyright, 1928, by The Self -Improvement League of America- Volume XV FEBRUARY, 1928 178 &nee No. 10 Whole No. in erit HUGO GERNSBACK, Editor -in -Chief H. WINFIEI.D SECOtt, Managing Editor DR. T. O'CONOR SI.OANE, PH.D., Associate Editor Editorial and General Offices - - 230 Fifth Avenue, New York

"Those Who Refuse to Go Beyond Fact Rarely Get as Far as Fact" - - HUXLEY DU WE LIVE IN A SUPRA -WORLD? By HUGO GERNSBACK

FISH swimming in the water, its natural element, is Light rays, being of electro -magnetic nature, it would seem not aware of the fact of the water itself. A six year that they would fall under the classification of supra -conductors. old child does not realize that it lives in a very dense In a sense, it is therefore quite possible that the light which we medium-air. Yet, the air exerts a pressuré upon obtain from the sun, for instance, comes to us without any appre- the human body of almost fifteen pounds to the square ciable loss, whatsoever, because space being at an absolute zero, inch of its surface. Only by waving our hands rapidly will offer no resistance to the passage of the light rays, and the through the air do we become conscious that we are immersed in latter, therefore, are not at all weakened in the passage from the a perfectly transparent fluid. sun to the earth. No energy is consumed while they traverse 92 It is this ocean of air in which we live that prevents us from million miles. This would give an excellent explanation why light, actually knowing what is outside of that ocean. For instance, a and the subsequent transformation to heat of the sun's rays suffer deep sea fish near the bottom of the ocean, is not conscious that no appreciable loss at all in transit. It would also appear that there might be another world outside of the water, and even if he the sun furnishes no energy to space itself, except where the rays was a thinking individual he could hardly comprehend that such a strike a celestial body, such as the earth or the other planets. This world could exist in a different sort of fluid. would be similar to an alternating current generator, that runs Carrying this analogy a little further, we may ask ourselves the practically idle, as long as no current is used at the far end of the question: What is outside our earth? What does our outer line. Yet the line wires are there, and while there must be poten- space consist of, and what are the properties of this outside space? tial changes in the line. still no current is being used until the load Astronomers have been telling us for many years, that for one is put across the line. thing, outer space is practically a vacuum, there being of course, It would also appear, that gravitation, whatever its nature, would no atmosphere. The proof of this is easy to obtain astronomically, fall into the classification of the supra -conductor. This would as for instance, we know today from observations of astronomers explain many celestial phenomena that are obscure today. For that there is practically no air on the moon, our nearest neighbor. instance, it can be proved, that the earth revolving around the The moon eclipses a star instantaneously-a phenomenon impossible sun has a centrifugal force, similar to that developed by the action is atmos- if the moon had an appreciable atmosphere. If there an of the boy who swings a weight around his head by means of a phere, it clings quite close to the moon, and certainly does not string. The faster he spins the weight, the more strain there is extend more than a few hundred feet from the surface, whereas, on the cord. Yet, the earth spins around the sun at the tremendous the atmosphere of the earth does not extend for over 600 miles velocity of 65,000 miles an hour, but there is no string to hold above its surface. the earth to the sun. Indeed, the speed is so great, that you would Science now knows that outer space contains no heat whatsoever, need a cable almost as large in diameter as the earth itself, accord- in figures, and that all space is at an absolute zero, which, expressed ing to theoretical calculations, to keep the earth from flying out is minus 459.4.. Fahrenheit. These are well-known facts, and have into space at a tangent. Yet, there is no chain holding the earth been known for years. but the experiments of excessive degrees of to the sun, and the earth does not fly out into space. What holds of Leyden, cold by Professor Kanterlingh Onnes at the University the earth in its orbit against this tremendous pull ? Science will made during the past few years, have given us a great deal of tell us that it is gravitation, but this is but a poor answer to the food for thought. Professor Onnes. by means of liquifying helium. question; it is only a name. has been able to closely approach absolute zero, when he reached the low temperature of minus 457.6°F. This approaches the abso- It would seem, therefore. that we should think of gravitation lute zero closely. At such extremely low temperatures, a number as some invisible, yet solid enough chain, which is actually in things begin to happen. existence. But gravitation probably being a supra -conductor, that of astonishing now simple As is well known, an electric current traversing a conductor, is, of no resistance, it becomes fairly to our imagination, rise to heat. If the conductor passes a sufficient current it because a supra -conductor can transmit a practically infinite amount gives if is becomes white hot, as for instance the filament in an incandescent of power through an infinitely small conductor, and gravity lamp. But if you took the same electric lamp bulb into outer space this conductor, a lot of things become clearer to our understanding. hundreds of miles above the earth's surface and tried to light it up It even opens up new avenues for inter -stellar space flying, with the identical current, a most surprising thing would he seen. because we can imagine a small electric generator operating outside You would find that it no longer would light, for the simple reason of our space flyer and therefore immersed in absolute zero. Once that at such extreme colds, all conductors of electricity lose their started, such a machine would furnish current without stopping, resistance entirely. Professor Onnes in this manner, was enabled which could be used for navigation, when the principles of gravi- to send tremendous currents through very thin conductors, that tation arc fully understood and harnessed. would ordinarily have become white hot and burn up or volatilize. is learning much from -conductors. such colds, conductors are termed supra -conductors. One thing sure, we are supra Under extreme motion on a prac- because they become supra -conductive to the electric current. But We know for instance, that although perpetual Inasmuch as metallic wires in absolute zero lose tical scale is perhaps never possible on earth, yet the earth and the that isn't all. in is possible to start an electric current in a con- rest of the planets are perpetual motion machines, a practical all resistance. it other planets revolve ductor, and that current will keep on flowing without stopping. sense. The earth, the moon and the about here we have a sort of perpetual motion, but of the sun, and require no power, once they had been started. They In other words, for millions of years. This, no doubt, is course, it requires so much power to obtain it, that it would not have thus revolved we live in _a supra -world, that has no resistance and offers be practical. because see what happens out in space if we apply this no resistance to anything once it has been started in motion. It is Now let us machine reasoning to astronomy. I believe the thoughts which I present the most ideal frictionless Imaginable, and the most eco- herewith have not been considered up to this time. nomical that could he evolved.

Mr. Hugo Gernsback speaks every Tuesday at 9.30 P. M. from Station WRNY on various scientific and radio subjects. RR3 884 Science and Invention for February, 1928

i" " e _ _._..1, 1

I J1

t-

t 111 ' 3T. it , nn ñ + . --":t"111-~7\5311°' _al 1 ti 1 qtC1cn t 111,ty7Qi 11 111tt1t'1. fI1 Tt li'I 4SI4444449º "^^^ ` ` e 1 rte\

°~.- - - 1 1, 111 i7-Íf~ '' "1+'lf--fí:rnt.r,+f, J 111 lc-79174 tv t a- ' it ` h ~ . ` ry t -"r" ,5 t . ó 14111111 '42" Here is a view of the stage of the new Hammerstein this theatre is Theatre in New York. The organ in beneath the stage. The structure is pure Gothic in design. Storm, with the Entire Stage Flooded with Rain in One Moment and Dry the Next, Entirely Makes the Presentation of "Golden Dawn" Wonderfully Spectacular By JOSEPH H. KRAUS A the new Hammerstein Theatre, re- itself is on a special platform which can be cently opened in New York City, we smaller than those found in theatres of the raised or lowered by a motor -driven screw ; find many architectural wonders, unique same size. Here we see merely a series of in thus the operator at the console can bring handles, interspersed with a theatre design. The auditorium it- himself few pilot lights, self is into view or can gradually descend and a single master control wheel. of pure Gothic design. Beautiful beneath These leaded glass the stage -floor level. A second con- handles are so arranged that they can be panels emblazon the wall. trol will be found on Suspended from the center the switchboard to one twisted to the right or left, engaging in a of the dome -like side and a little above the stage -floor ceiling, there is an immense Gothic lamp level. slotted disk. Ordinarily such switches are of manipulated quite unusual design. The windows them- ORCHESTRA APPEARS ON RISING by hand, or operated by rapidly selves are illuminated from behind and most PLATFORM turning a large screw which communicates of the lighting effects in the entire theatre the motion to all of the switches arranged in The same feature is applicable to the tandem but not are either indirect or semi -indirect. Instead orchestra so at this new theatre. Here of the organ because the entire orchestra plat- we find a hydraulic control dimmer. This is pipes being arrayed on either form can be raised and lowered side of the proscenium by motor - so arranged that it operates all of the rheo- opening, the organ is driven screws. The electric motor is found in a large sound -proof room coupled stats by moving a piston approximately eight immedi- to a shalt at one end, and it communicates inches in ately beneath the stage. The organ music diameter up or down. The dia- issues the power through a worm operating a series gram for the dimmer control is briefly in- through baffle -controlled openings to of screws the auditorium. located under the platform. In dicated in the insert on these pages. It will this way the orchestra can be made to rise be found that when the is The largest pipe in this organ is 16 feet fully into valve turned as long. view, or to disappear from sight, illustrated, that the piston will have a ten- The room itself is immense, yet filled and even leave their position with pipes in such a fashion in the pit with - dency to move upward if water is let in that one won- but anyone knowing it. through ders how it is possible for a man to in the bottom opening. This move- move ment can be and out among them, when changing or tun- THE MARVELOUS ELECTRIC so controlled that the lights do ing them properly. Even SWITCHBOARD not completely dim for several hours, or can the cathedral gongs be made are confined in this sound room so rapid that the effect is practically -proof be- A word or two now concerning the switch- like a flash. At neath the stage, which is provided the same time that one of with board for which Mr. Dolan, Mr. Hammer - the groups of lights are baffles, so that the volume can be controlled stein's being gradually electrician is largely responsible. dimmed, another group can be made to light at the will of the organist. The console While this is quite a large affair, it is much up thus producing a perfect dissolve. It is Science and Invention for February, 1928 885 eat. e

b

ECCENTh'IC(é áA \J /l !

MOVING MIRROR

CLOUD MACHINE

RAIN EFFECT PERFORATED PIPE FOR CONCENTRATI NG .._-'--- LENS CLOUD SLIDE

- I .,i,, .. DETAIL OF POERFULW LIGHTS'OF DIFFERENT i,hl' 11, CLOUD MACHINE i , COLORS THROWN INTO THE FALL, . '. iiiii4....,,r,;.....ING SHEET OF WATER GIVE THE .', EFFECT OF THE ENTIRE STAGE;;'¡ WITH RAIN - TO RHEOSTATS BEING FLOODED, ,, ',octrr,c,cl IqQ' VV/11/..1 ( ,, ,SWITCHBOARD'' ',;; i.i_,f..rF--(?*?/ (f_' e - - ;%'. InI,'*'G TO RHEOSTAT 6;3L f¡ ' '' ORGAN CONSOLE ,,t i '1,- RAISEOAriDLOWERED ' SCREW, Q t @v MOTOR DRIVEN WiTEF3PROOF , 0 f=ABi'il- ROUGH ' -- -''-i a_ i -- ORGAN . VALVE I -4-- -Z. SOUND PROOF l INTAKE ORGAN auno -1 - j ,J I IiI ROOM - , `st OUTLET ORCHESTRA PLATFORM RAISED ANDLOWERED BY MOTOR DRIVEN SCREWS -'-----

PUMDAND HYDRAULIC DIMMER CONTROL MOTOR (RAIN EFFECT) really uncanny to watch this switch board tating about a center point, the rotation be- REMARKABLE RAIN EFFECT fairly operate itself. ing controlled by a motor. For each lens In order to produce the effect of the we find an oscillating mirror which can be storm, a perforated pipe is mounted in back is supplied THE CLOUD PRODUCER controlled from the switchboard to operate of .the proscenium opening. This slowly or very rapidly. It is these oscillat- with water under pressure and the water is Depending from the grid we find a ing mirrors which cause the clouds to roll caught in a water -proof fabric trough made unique cloud machine used in one "f the about violently. The housing contains a to represent the foreground of the scene. scenes in the "Golden Dawn," now playing three thousand watt special incandescent This trough is raised at both ends and does at the theatre. The "Golden Dawn" is .a bulb, the light of which after passing through not communicate with any drain or other musical drama of intense appeal. In one of a condensing lens, passes th-ough a slide disposal method. Now when it comes time the scenes, a storm is required and here is which is an actual photograph of cloud for- for the storm, and the sky darkens, and after one place where we have it. Lightning, mation. The slide itself is only one of the we hear the distant rumbling of thunder, thunder and rain, torrents of it-it seems as series, the entire group being mounted in the we see a down -pour, the like of which has though the whole stage is flooded. The ring of projectors. Between the incandescent probably never been duplicated on any New clouds roll from one end of the horizon to bulb and the lenses, a vignette of tin is em- York stage. It appears as if the entire the other, and then roll back again. They ployed which cuts down the possible cloud stage from the footlights to the back wall are absolutely true to nature, and yet far projections on the building, trees, and other were flooded, yet when the curtain rises more perfect than they could ever be ob- scenery, and limits the projection of clouds again, the water has miraculously disap- tained with a motion picture machine. to the sky portion of the horizon. The peared and strange to say, the artists cos- The cloud machine consists of a large lightning and rumble of thunder are pro- tumes are all dry. The illusion of depth to multiple lens multiple mirror projector, ro- duced in the well know stage -time methods. the effect is obtained by proper lighting. 886 Science and Invention for February, 1928

S eit

Motor.' r. Whip for Ice Skaters i- By HUGO

GERNSBACK The motor-whip is here seen in action on an ice -covered pond. A brand new sport.

CE skaters are constantly looking for motion imparted to him by the wheel, new pleasure, and any new ice sport. shoots him off at a tangent. The SPOIS_ that comes along, is usually greeted game is supposed to be played in ' HUB wPINS Jiii HAN D Some years ago, such fashion, is HOLD with enthusiasm. a that the skater FEED I constructed a simple apparatus which not allowed to move his feet to assist 2" PIPE WIRES SPEED CONTRO' I termed the Molor-Whip, and which the propulsion speed which he has was used with excellent results on a small obtained from the wheel. 3" PIPE lake, in the country. The idea is very Naturally, the distance traversed L simple, and consists in a few words, of by the skater is determined by a num- %4 H.P. a large wagon wheel attached to a small ber of factors, such as sharpness of ELECTRIC fractional horsepower electric motor. MOTOR The wagon wheel has ordinary handles, OR 1/2 rol H.P. attached at its circumference, as shown T READED CLAM P GASOLINE INTO PI PE -A ENGINE in the illustration. The wheel revolves HUB at a fair speed, not too great to make the sport dangerous; say about two revo- IRON or 120 revolutions HUB lutions per second per 2 -PIPE+ f= G"TOIO"LONG-; IC minute. The skater comes along, grabs , one of the handles and whirls around, one turn. At a predetermined TWISTED 2'XE complete BELT FOR PLANK Sectional view through motor -whip showing point, he releases his hand hold, and the ,HORIZONTAL,____,, spur -gear drive from electric motor. The gear ENGINE teeth ratio may, be about 15 to 1. I Wiring diagrams for the motor, as well as the lights atop the pole, are shown below; to- 3'PIPE; in the illustration. For instance, in fig- gether with an optional desig of home-made ENGINE7=~__-1 ure 1, a double whip is shown, where wheel. In this design of wheel, two by six- I . two skaters are flung out. Thus, the inch planks are mortised at the center, and BELT PULLEVON MAIN SHAFT contest can be staged between couples, bolted to a standard machine belt pulley, IDLER PULLEY the hub of which clamps to the revolving shaft. seeing which one goes out the furthest; %g RIVETS the one going the furthest, naturally get- FLUSH ting credited with the highest amount COUNTER- LIGHTS ENGINE PULLEY. SUNK HEADS of points. In Figure 2, another simple arrange- HO op, 220 ment is shown, where a marker, with a Two other designs of home-made wheels flag, is ice. VOLT LINE for the motor -whip are shown above, to- stationed on the The skater's gether with several hints for various problem is to round that marker one full WIRING belt drives. turn, and then it is up to him to see how DIAGRAM much further he can go on towards the goal as shown. ABOUT 2FT DIAMETER skates, SWITCH BELT PULLEY. weight of the skater, wind It should be understood, that this en- R resistance. skill in skating, that is, tire sport revolves about the fact, that SPEED REGULATOR OPTIONAL keeping both feet strictly parallel, a skater at no time must move either ®L , >. WHEEL DESIGN. and other minor points. his feet or legs to actually propel him- The sport, however, does not con- self. The SPEED ,JI feet are not to be lifted from REGULATOR y SERIES sist of this one method alone, but the ice and must he held close together; RESISTANCE MOTOR a number of games have been evolved parallel. Referring again to figure 2, by me, and which are also shown it will be seen that a good deal of skill Science and Invention for February, 1928 887 is required to round the marker, and yet be turned on or off by the skaters at will, purpose. The wheel can also be made of enable the skater to cover a fair distance simply by reaching over in case it is desired one and a quarter inch pipe, as shown. Hand after he has thus rounded it. After a num- to start or stop the motor. grips are arranged at intervals around its ber of trials, more skill is acquired, and For those technically inclined, further in- circumference, for the convenience of the formation is given underneath the illustra- skaters. A method of tightening or loosen- tions. This gives sufficient data for the ing the belt's drive should be employed, sev- builder. The important thing to remember eral suggestions of which are given in the is that the base upon which the entire appa- illustration. The wheel revolves at a speed ratus rests must be quite solid, and should of about 2 revolutions per second or 120 per not wobble, inasmuch as considerable strain minute, so that the sport is not dangerous. is put upon the support and for that reason The skater holds on to the wheel for otie the plank or planking supporting the wheel 'complete turn, and at a certain point he re- must be well anchored in the ice. The more leases his hold, flying off at a tangent. A support there is, the better the apparatus goal is arranged at a distance from the will work. Be sure that it is absolutely wheel and the skater must reach this goal solid, and does not move sidcNays in any without moving his feet to assist the pro- respect. Usually by taking a pail of water pulsion speed which was given him by the and pouring it under the planking, enough wheel. The distance traversed will be de- ice will form to secure a good support. termined entirely, by his skill in skating and At one time, when thaw threatened, it a number of other factors such as the sharp- was necessary to remove the apparatus ness of the skates, the wind resistance and quickly, and this was done, simply by pour- the like. The sport, of course, can be greatly ing a few pails of hot water around the varied. One idea is to place an obstacle planking, which loosened the apparatus in- post in the pathway to the goal which the side of three or four minutes, after which skater must encircle before continuing on was pulled to the shore and stored in a It his way to the finish line. A number of shed. these posts may be arranged in a line, the object being for the skater to wind his way in and out between these until he reaches the goal. A variation of the sport, which can be carried out with the goal post alone, is also shown. This consists in encircling Above we see two skaters who are holding on to the wheel, hand in hand. The sport in- one or both of the goal posts before the creases by holding on in this manner. Fig. 1. finish is reached. A good deal of skill is required before the skater will become pro- the skater becomes more proficient. In ficient in this sport. Throughout the con- Figure 3, we have a similar arrangement, test. the feet are not lifted from the ice, but whereby two markers or goal posts have to are held close together in a parallel position. be rounded in the Figure 8 style. and after The apparatus can also be equipped with successfully negotiating the figure 8, the a number of electric lights, so that it can skater tries to cover a further distance if be used at night, giving sufficient illumina- he can do so. Another variation in the same tion for carrying on the sport. The Motor - sport is shown in figure 4, where a number Whip can be built at a very reasonable cost, of markers have to be negotiated. Of and should provide many hours of healthy course, most skaters will never be able to amusement. Enough data has been given so negotiate all of them, unless they are quite that anyone who is handy with tools will be skillful. Their speed has been reduced a able to build the whip. The base upon great deal in the negotiation of each subse- which the apparatus rests should be solid quent marker, for it must be remembered, and be able to stand the strain which is put that every time the skater leans sideways, upon it. Furthermore, it should be anchored a braking action occurs, which cuts down in the ice by a number of pegs. The motor the speed. switch handle extends both ways above the These few examples have only been given wheel, but does not revolve. This switch to elucidate what can be done. Of course, handle operates the motor wheel and can be there are many others that the skaters them - turned off by the skaters at will, simply by :elves can work out, as for instance back- reaching across the wheel in case they desire ward flipping; one skater backward and the to start or stop the motor. Electric heating other forward, etc. The apparatus is not coils may be built inside the pipe pegs, and difficult of construction. Any good elec- switched into circuit at the desired time. trician or anyone handy with tools and This will quickly loosen the pegs. machinery can build one for a few dollars. L An old second-hand motor will come in good stead, and the entire outfit can be built for Two variations of the motor -whip game are shown above. Fig. 2 consists in circling a .- a nominal amount. marked post before heading tom ards the goal, The apparatus which I originally built and Fig. 4, in winding a zigzag course in was mounted on a number of heavy planks, between a number of these poles. about 5 feet square. The wheel itself, was a 6 foot light wagon wheel. After the ice A motor turning over at about 1,800 revo- had formed, the apparatus was taken out lutions per minute is used on the ice and then secured by means of to supply the power to turn the whip. the is four wooden pegs into the ice. where they If motor of the gasoline type, it should be were frozen in after a few hours. The rated at about to apparatus was left in this position until the one-half one horsepower, but an electric motor of one -quarter horsepower will drive end of the skating season or as soon as I' !43i thaw threatened by weather report; then it nicely. The rotary motion :s imparted to . the wheel it was moved to the land in a safe position, by gears having a ratio of about so it would not sink. fifteen to one. The stand or upright por- is ,..,...... -....1- 1,...... The apparatus also was equipped with a tion made of two pieces of pipe, one two number of electric lights so it could be used inches in diameter, and the other three inches. The electric light wires running to by night as well, giving sufficient illumina- s. .. tion for all purposes. An installation like the motor are brought in at the top, and > that shown and the entire construction of led down through the pipe. The whole ar- the apparatus, with the second-hand motor rangement is mounted upon a strong plank excepted, with all labor amounted to less base about 3 feet square, which has four than $30.00. In the detailed illustrations, pegs made of pipe or wood projecting down- sufficient technical data has been given to ward, so as to hold the Motor -Whip firmly enable anyone handy with tools and machin- in the ice. ery to build the Motor -Whip. Of interest, The illustrations show various ways in is the handle which extends both ways on which the wheel can he constructed, a belt top of the wheel. This motor switch handle pulley about two feet in diameter, with a The method of scoring a goal as shown above does not revolve, but remains stationary. cross of wood bolted firmly to it, may he Is probably the most intricate and thrilling This handle works the switch, which used as the of them all. In order to score, the skater oper- wheel. If an old wagon wheel must first encircle one of the supports of the ates the motor wheel. Thus the switch can is handy, this will serve admirably for this goal, as shown in the above illustration, Fig. 3. 888 Science and Invention for February, 1928 Test Machines at High Speed in Pit

r,aw1014 1 - -5

Vacant Land 1, Mile

Company Building/ iw Not Factory 3. kyl Test Pit Observation Building 300h.

r/ Electric wires enabling 1` aerial and visual check on rotors behavior Note Above is a photo showing the interior of the huge Man testing pit. To the left we have another the pit, view of Above we have together with the top plate. This plate is an illustration show- 8 feet thick and is made of ing the situation of the pit, the ob- concrete and steeL servation building and the factory. The observation building is situated 300 feet away from the testing pit. The pit itself is one -quarter mile away from the factory. PIT CROSS SECTION

THE 1 OLD , /Motor WAY ' \y, 1 Platform Floor I-: - 1 ',.,;.."/../ ' ` ,/ Level Rotor st 11 i retei 1Sandll " THE NEW Cushion /: /} ír. WAY f4 CSlnv,ete' / Pilesdriven iijT to Rock i/ r'= --t - _ -__ - T- 11 ' i r . . 4 -500 Ton Bearing / / l 11 11 r-6 / - --.-r -.- hazi=.I-- .-2u T1R-1 The illustration above shows the old way and the large pieces of new way of testing The illustration above shows a revolving machinery. The old way of testing was cross section of the pit, with most extremely dangerous. of its salient features. Courtesy General Electric Co. The world's largest testing pit, which cated anywhere permits the testing of else in the world, at the building has been erected 300 feet from large pieces of revolv- present time. It will test rotors the ing machinery with safety to the from the pit. In this building are cables controlling operators, smallest size up to a huge machine 40 feet has just been completed by the General Elec- the motors in the pit and means of obtaining in diameter, and weighing as much as 500 either tric Co., at Schenectady, New York. This tons. visual or photographic records of pit will The pit itself is a circular chamber the amount of vibration. permit tests which cannot be dupli- with a depth The testing of of 30 feet. An observation high-speed rotors is thus made safe. Making Bubble Toys By RAYMOND B. WAILES WIRE SCREEN' Bubble toys, resembling a man, a monkey, and the like, with a glass tube in their mouth, upon which they are sucking at all times, may be constructed easily. The details of this novel toy are shown in the illustration. The finished toy can be dressed appropri- WICK COLOREDE WATER At the left we have a photograph of the com- ALCOHOL pleted bubble toy. It has a glass tube in its mouth upon which it seems to be sucking merrily at all times.

ately. From time to time, the water which evaporates will have to be replaced. This little scientific toy is' in reality a hygrom- WATER, eter which shows the amount of moisture in the air. When there is much moisture in the air the water will not evaporate from the cloth head as fast as it will if the humid- `.,,-rA tl. ity is low, so the drop of liquid would only run up the tube say about 60 times a minute. If the air is dry, the drop will move Above we have an 11 ustration showing the faster. details of construction of the bubble toy. Science and Invention for February, 1928 &S9 Locomotives ----Old and New One Modern Locomotive Weighs Almost Twice as Much as Eleven "Old Timers'

N 1769 Nicholas Cugnot, of France, built what west of the Mississippi. This historical locomotive is might be termed the father of the present-day shown in the illustration with a train of cars. The engine locomotive. His invention represented the first was originally a wood -burner and later was changed so practical step toward the goal of steam pro- that coal could be used. With the growth of the railway, pulsion on land. This machine has been carefully heavier and more powerful engines were required, and preserved and is still in existence in Paris. Vari- the "William Crooks" was relegated to other work. Its ous other advances were last active service was performed in 1908, nearly a hall made along this line and =á - a century after it made its first run. The old locomotive on August 25, 1830, the ^ was used again in 1924 on an exhibition tour, along 'Tom Thumb," the first T' .. with one of the new huge oil -burning power locomotive built in this ,. i\.. units. The small engine was dwarfed in country, ran a distance size by the modern giant, but it lived of thirteen miles under tip to its record of fifty years of its own power, making service by making the entire a successful trip from fi tour under its own power. The Baltimore to Ellicott's locomotive was named after Mills, pushing a small William Crooks, the first en- open car with eighteen gineer of the St. Paul & passengers a b o a r d. Pacific R.R., which was the Various other engines beginning of the present with numerous im- Great Northern Railway. provements followed In the years following the "Tom Thumb" Weighed in the balance and found after the Civil War, the wanting-in weight. Eleven old in and its predecessors. time steam engines weighing ap- railroad systems then until now we have proximately 174 tons are outweighed existence grew rapidly by modern locomotive the super -locomotive . the super and extended their lines "The Confederation" which has a over greater territory. which weighs 652.- ! total weight of 326 tons with the II 000 pounds or 326 ? tender. In the balance at the left After the advent of No. 1 is the "Cugnot" which the first engine. the It weighed about three tons. No. 2 is the "Trevithick III," weight "Cugnot," in 1769, in one ton. No. 3 is the "Evans' France, Captain Rich- Scow" which weighed six tons. The ard Trevithick built next engine is the "Rocket" weigh- ing five tons. Next we have the 'he "Trevithick III." first locomotive built in America This was the first known as the "Tom Thumb," weigh- locomotive in the 'pY: ing one ton. No. 6 _s the "Brun- ton," weight six tons. "Feet" and world to run on ti jointed legs pushed it forward. rails and was oper- No. 7 is the "South Carolina," , weight ated on the South .- twenty tons. No. 8 is the "Jervis Engine," which weighed Wales tramway, in fifteen tons. No. 9 is the famous England. It was a "Camel -back" engine success in every which weighed f o r t y tons. No. 10 is the "Wil- way, except from liam Crooks" locomotive a financial stand- which weighed seventy as horse tons, including the train point, and cars. No. 11 is the operation w a a "Atlantic" which weighed less expensive six and one-half tons. upkeep Illustrations C ourtesy than the Baltimore and Ohio R. R. of the loco- motive. Thp "Brunton," constructed in 1813, was known as the

10 .4nliírj2RE'fi - _Jr t n

tons, including the tender. This huge "iron horse" is known as the "Confederation" and is used by the Canadian National Rail- way. It is fifteen feet, four inches high, ten feet, eleven inches r.i wide; and ninety-three feet, ten inches long, including the tender. Some idea of the tremendous power which this engine is capable of generating may be obtained from the fact that the boiler pressure is 250 pounds per square inch, and that it can develop more than 3,200 horsepower. The next largest locomotive to this is "horse -leg locomotive" and was one of the oldest of all the early the "President Washington," which weighs 270 tons, including the types. The "Brunton" was operated by a mechanism which alter- tender. The little "William Crooks," built in 1861 by Smith & nately caused one of a pair of very long legs and "feet" to push the Jackson. of Paterson, N. J., was the first engine to pull a train engine forward. It lost out, due to its slow speed of 3 miles per hour. 890 Science and Invention for February, 1928

rp . " .--=VITIATED Man -Made Storm AIR I NORTH WEST FRESH AIR Ventilates TOWER Hudson Auto Tube Huge Blower System Supplies Fresh °I AIR-imEr ENTERS LOÚVulS Air to Tubes ,1 ~r,z1 t, ONE of the most important problems facing the engineers in the construction of the Holland Tunnel was a sys- .1% tem of ventilation which would supply fresh air at

^ all times. This has been accomplished by means of huge -g. -JL ventilating shafts or buildings which supply a man-made gale blowing at the rate of miles `I F.ErÓtB +Fj- +w E3FR seventy-two an hour which sweeps the carbon monoxide gas out of the twin tubes of .'1- R _ f .:STÁ. 'I 1 the tunnel. Beneath the roadway is long + l t-f a duct with branches leading to rQ_ an expansion box in which the storm '-_-F R1 0 1./ '_.,-ºr^9 _. O, I . expends most of its fury, so that only a gentle breeze emerges from the box. Exhaust fans placed above the Ir MOTOR roadway suck out the foul air. The ventilating shafts are as high as 17. an ordinary ten -story building, and are equipped Í with eighty-four fans, forty-two blowers and forty-two exhausters. These fans are not in operation at the same 1 time, some are held in reserve as an added precaution. Three ' 2 30ovOLT t electric cables run from the New York ówfRtcl y side, and three from I New Jersey. A large switchboard contains a number of lamps, which indicate the amount of carbon dioxide and water in the tunnel. TRANSFORMER AIR ROOM y j CROSS SECTION N.Y.RIVER BLDG.

I ',= # - X. I `I 1 r j ., ; , I 1 # VITIATEDa 1 S _'1 1 AIR DUCT. ° a j t - wITfATEG 1 ' _ ``yr, AIRGV a / i -- . , L,o!

, t. ` áRESH AIR FRESH AIR DUCT DUCT

MAIN CONTROL - SWITCHBOARD ^.Y.t,^ºº:oc /pr .l.LbD .c.-,aº.,_ r. r3 .+...Ir,c- Above -A cross -sect on of one of the r four ventilating towers, I I$ showing the 1 ; elaborate blower system. This plant TYPICAL supplies flesh air to the SECTION UN- tunnel and DER RIVER eliminates the deafly carbon mon- / Y4702: oxide gas. This is the New York River building. Above is a At the cross-section of one of the twin tunnels left is a view of the master as it appears beneath the river. The fresh air duct control board of the Holland Is placed where tunnel, beneath the roadway and the foul air is all the wires of the gigantic drawn off above. Vents placed in the ceiling pro- tube system are collected. vide an board From this outlet for the poisoned air. The tunnel is it is possible to 29ft. 6 inches in times just tell at all diameter and has a length of 9,250 ft. what the conditions within Sand boxes and "foam" extinguishers for fire fighting e- the tunnel axe. are arranged at frequent intervals.

G.L.3 w. R.R.YARD T'l..a n. EyIPLA HO LLANO . t --e, ' 1 - ..LaNue- ( TUNNEL;S or h..-- N.J. LAND µ=OMIT 1 FiLOGJf/1.- - -^ oila7 £7-3 1 - ENTRANCE PLAZA C0n.4, I - HUDSON gTPLAZA . RIVER ií -ERIE R.R.YARD AO trRAT1T10B® l Ur e r 5 {, L l The above drawing shows the exact location of the Holland Tunnel and the exit and entrance plazas on both sides of the river. Science and Invention for February, 1928 -'891 Pendulum Locates Oil Deposits By S. R. WINTERS Variations Caused in Pendulum Swing by Gravity Changes Occasioned by Presence of Oil PENDULUM may qualify as the during the observations, the air pressure is the determination of gravity is called the modern divining rod in searching reduced to 60 millimeters of mercury. The relative method. The pendulum is swung at for oil and precious minerals below pendulum swings freely and the impulse the base station in the office of the Coast and A the surface of the earth. Unlike the which gives it momentum is one's hand, Geodetic Survey, in \Vashington, and again twig of hazel or willow, which is supposed which pushes aside the pendulum bob 4 milli- at the field station. The determination of to exercise magic in discovering the presence meters from the vertical. The plane in the the difference in the times required for one of hidden wealth, the gravity pendulum gives head of the pendulum and the knife-edge on oscillation at each of the two places makes promise of revealing the locations of rich the case are of agate and the former is it possible to determine the difference in oil fields in accordance with a well-founded made with such great precision that the pen- gravity between the two points. The obser- scientific principle. dulum will swing for 12 hours without ceas- ations are usually continued for two days, Dr. William Bowie, Chief of the Division ing. in order to get checked measures of the of Geodesy of the United States Coast and The case containing the gravity pendulum value of gravity. Geodetic Survey and President of the Sec- is placed on a concrete or stone slab, resting "The process by which one would attempt tion of Geodesy of the International Geo- on the ground; or it is set on a concrete to apply the gravity pendulums in the search detic and Geophysical Union, is convinced floor, if a basement is available in which to for petroleum -bearing materials would be to

Standard Pendulum Time .{c z.14 ^'1..r+^ R"3it-- ;. . '-`:. -"- . A B E 4 °..,::;.,:s. .^ :';!' _ `-; - t ` , D Difference intime for oscillation of pendulum - FixedsurveyPoints in test position ' - for pendulum tests Above we have a photo s !_ - --.. showing the pendulum oil locator. A and B-pendu- .. lums; C-telescope and . .n`. .---- : lamp; D-airtight case in which pendulum is swung. Presence of/-bear/n.9 of ot.S mirror Moving micro so,/ alters rote ofpen- moves reflected onpendu/um -- du/um osti//otión to observer Fired I mirror Telescope

Li ht beam Shutter i/gminotet Swinyiny both fixed pendulum e=4;="1-. V Source and moving .r.: of light mirrors H.. Mirror or prilm A diagram showing just how ".t ..t.So:.-' appears .- < this oil locator. works, 4- ' i above. The differences in time --Chronometer in the period of swing of the f pendulum are recorded by an e.' astronomical method. a- Battery

A number of test points are fixed over a proven field as shown above. The oil -locating pendulum is then placed on each one of these spots, and the presence of oil-bearing strata alters the rate of oscillation.

make observations. The pendulum ís con- observe gravity first at a number of points that there is a well-defined relation between observa- the gravity or pull of the earth and the den- structed of invar, an alloy that does not con- over a proved field. From these crust. tract nor expand when subjected to tempera- tions one could determine whether the small sity of the material under the earth's the material below Therefore, a gravity peddiflum can be used ture fluctuations. Formerly, when employ- differences in density of ing bronze pendulums, it was necessary to the surface caused a chaiige in the gravity in determining these variations in the earth's thus obtained pull and, to that extent, serve as an index to use them in a room or vault where tempera- values. If so, the information were fairly uniform. The could be used in prospecting a new field and the density or thickness of the under -surface ture conditions found at of oil-bearing oscillations or to and fro movements of the if abnormal values of gravity were strata and possible presence idea of the sub- rock. gravity pendulum are compared by the so- the various stations some be obtained. A large oil company is now employing a called coincidence method with -na astro- surface structure could nomic chronometer. "I do not feel that a definite prediction can pendulum, similar to that used by the Coast can be and Geodetic in its search for new Captain Edwin T. Pollock. Superintendent be made that the gravity pendulum Survey, salt domes or oil -indicating oil fields. Dr. E. A. Eckhardt, a distin- of the United States Naval Observatory, re- used to detect cently stated that radio time signals were rocks, but I am positive that the larger sub- guished scientist, resigned his position as by the of the Bureau of being used in locating oil deposits. This structural features can be outlined Chief of the Sound Section am of the opinion that become identified with a large statement implied that in employing the gravity pendulum. I Standards, to pendulum should be thoroughly western oil company whose search for petro- gravity pendulum in searching for petro- the gravity leum chronometer or timepiece must be tested, as is now being done by nne of the leum involves the use of a gravity pendulum the learn Investigations by the rated by local observations on the stars with large oil companies, in order to or similar device. methods can he devel- Coast and Geodetic Survey at 300 gravity a telescope or by means of time signals whether or not new flashed by radio from the Naval Observa- oped in searching for petroleum. stations indicate that there is a definite re- to pull or gravity tory, through the Annapolis or Bellevue ra- "At least, it would appear worth while lation between the earth's over a large area and the density of the material of the earth's tio stations. The period of swing of the make a gravity survey pendulum is thus obtained with so great an where there is a possibility of oil to learn crust. is indicated The modern divining rod for making an accuracy as the ten -millionth part of a sec- whether the subsurface structure the earth consists of ond. as clearly as seems possible, judging from X-ray of the bowels of far obtained in the a pendulum one-fourth of a meter long. "The method employed by the Coast and the gravity results so Dr. Bowie, "for (Continued on page 947) ' This functions in an air -tight case in which, Geodetic Survey," explains 892 Science and Invention for February, 1928 Television May Solve Star Secrets Color Images of Planets Cali Be Broadcast from Observatories and Flashed on Screen at Distant Point By DONALD H. MENZEL, Ph.D Lick Observatory

.------'--- ' - Mp,Rs .. MARS T o -- % . . . .

CANADA r_s ; - -Y"'` ,..r1>.?` t

VOICE FROM TRANSMITTING STATION. "THE WHITE CIRCLE IS THE POLAR CAP"

GULF or MEXICO

' S TELEVISION BEAM OF LIGHT -5 ENDER RECEIVING STATION

RED IMAGE In the upper portion of the The above drawing shows the receiving station OF MARS drawing, we see the observatory and the color projector, which throws the actual TO frm with its battery of telescopes image upon the screen. AMPLIFIER k which transmit the television images. These images will be explained by radio messages of the object. It is even possible that a sent out from the observatory. NS' battery of telescopes, trained on the same body, may be utilized. If red, yellow, and IMAGE OF ,// ,

Latest Stage Novelty Mystifies New York Audience

By H. WINFIELD SECOR

IN the flying piano act, the instrument was suspended from each corner by 3/4/ -inch steel cables which passed t trough eye -bolts fastened to the case. The four cables eventually carne together in a :Y -inch steel cable, which was led a through the gridiron above the stage, over several pulleys and thence back -stage to a motor winch. This winch wound in or let out the cable, thus regulating thé movements of the piano. These movements were further controlled from the fly gallery NCH NEW YORK'S latest stage by a stage hand, who regulated two cables attached tc t:ie sup- sensation was recently exhib- porting cables as shown. The stage orchestra was situated -STEEL .GABLE. t, ited at a well-known upon a moving platform, the- which further added to the novelty of 1. = atre. The audience was astounded the performance. A dark back drop was used and all stage the when a piano gently rose from the lights, as well as most of the lights in the theatre, were put out. stage and sailed into mid-air, A bank of powerful lights were as then directed toward the audi- gracefully as some huge white bird. ence. All these various so-called stage tricks preven-ed the During the flying episode from a young audience determining just how the piano floated :n mid- woman rendered various piano air, and thus made the act mystifying as well as entertaining. selections. This may seem a strange Several small shielded lights were placed above the key- and thrilling feat when viewed from board of the piano, so that the musician could see the keys CONTROL` the audience, but if one goes back- clearly. This is one the most successful means of of I stage as our artist did, this seem- producing a flying or floating but effect, several others ingly impossible act is readily ex- have been used previous to this occasion. The follcw=ng plained as shown in the illustration. was used in theatres , method some years ago, in connect on s¡ By the skillful arrangement' of the with an aerial singing act. The singer was seated upon 1 ghts the steel cables supporting the end of a steel boom, supported a which the by steel cable piano could not be discerned and passed through a pulley and thence back -stage. A black ¿id not contrast with the dark back velvet drop was used and the steel boom passed throtgh ` LLER' crop which was used. Powerful - this so that its movements could be regulated by the stage lights were directed toward ]lands. The velvet back was the drop slit in the center, allow- audience and the remainder of the ing for the insertion of the boom. A spotlight was theatre was plunged in almost thrown directly upon the singer. A counterweight could total darkness. Another novelty used in also be employed, and in some cases was fastened to conjunction with this remarkable (Continued on page 933) act was the moving platform upon which the stage orchestra was seated. During the act the foot- LIGHTED KEYBOA D .. -' lights were extinguished and a bank of / «48 IN. small shielded lamps, which were r .,.- ,__ ,Es....,a .- placed above the keyboard of the d STEEL - Z .; w . Z.*oí ; piano, were lighted. CABLES

. . AU. TAGÉ pGbITS O11T .u.! ' o z . c ...... ° 4114. fy-V.!J.í.r y M w, -g ..94. -4. 4A., EYE W1 IGS ._.-. BOLTS DARK -.=- - THROUG BACK ti' "- PIANO DROP . CASE , W. 1.4 "++ M ST, GE . 440.,...... ORCM :oil. ¡STRA' tvJ - I ... ,v~ ~ . . r .. , ,+ POWERFUL LIGHTS ,ü ( 1 t. IN FACE OFAUDIENCE 03 :

03 Mo i , a `PLATFORMo: .. +a MOTOR WINCH STAGE LEVEL RAISES AND EDOTLI'GH S LOWERS PIANO (OUT) - -

?he illustration at. -e shows the method of obtaining a flying effect as used in some theatres. 894 Science and Invention for February, 1928

1 / /' " bye.. YYIerrstt 74uil r of THE MOON POOL", "THE FACE IN THE ABY55"etc.

CHAPTER XV. "FREE! BUT A MONSTER!" (Fifth Installment; HE peculiar ability of the human tion, some strength -testing strugglé, back She lifted Ventnor's head from her lap mind to slip so readily into the refuge into the shelter of the obvious, finding in and rested it on the silks. She arose, eyes of the commonplace after or even it a familiar environment that demands no wrathful, her hands clenched as though to T during some well-nigh intolerable slightest expenditure of mental energy or strike Drake. crisis has long been to me one of the most initiative, and gaining fresh strength to "Oh-you brute!" she whispered. "And interesting phenomena of our psychology. sally forth again into the unfamiliar. I thought-I thought-Oh, I hate you !" It is instinctive, of course; a habit acquired I crave pardon for this digression. I set "That's better," said Drake, and smiled through precisely the same causes that have it down because I remember how when upon her. "Go ahead and hit me if you given to the animals their protective colora- Drake at last broke the silence that had want. The madder you get, the better you'll tion-the stripes, say, of the zebra and tiger closed in upon the passing of that still, feel." that blend so cunningly with the barred and small voice the essence of these thoughts For a moment I thought she was going speckled shadowings of bush and jungle, the occurred to me. to take him at his word, then her anger fled. twig and leaflike shapes and hues of certain Determinedly he strode over to the weep- "Thanks-Dick," she said quietly; and insects; in fact, all that natural camouflage ing girl, and in his tones was a roughness while I sat studying Ventnor, they put to- which was the basis of the art of conceal- that angered me until I realized his purpose. gether a meal from the stores, brewed tea ment so astonishingly developed in the late "Get up, Ruth !" he ordered. "He's come over the spirit -lamp with water from the war. back once, so he'll come back again. Now bubbling spring, and in these commonplaces Like the animals of the wild, the mind of let him be and help us get a meal together. I knew that she at least was finding relief man moves through a jungle-the jungle of I'm hungry." from that strain of the abnormal under life, passing along paths beaten out by the She looked up at him, incredulously, in- which we had labored so long. To my sur- thought of his countless forefathers in their dignation rising. prise I found that I was hungry, and with progress from birth to death. And these "Eat!" she exclaimed. "You can be deep relief I watched Ruth partake of food paths are bordered and screened, figuratively hungry !" and drink even though lightly. and literally, with bush and trees of his "You bet I can-and I am," he answered About her seemed to hover something of own selection, setting out and cultivation- cheerfully. "Come on; we've got to make the ethereal, elusive and disquieting. Was shelters of the familiar, the habitual, the the best of it." it the pellucid light that gave the effect, I customary. On these ancestral paths, within "Ruth," I broke in, gently, "we'll all have wondered. And knew it was not; for as I these barriers of usage, man moves hidden to think about ourselves a little if we're to observed her, covertly, I recognized upon her and secure as the animals in their haunts- be of any use to him. You must cat-and face that shadow of inhuman .tranquility, or so he thinks. then rest." of unearthly withdrawal which, I guessed, Outside them lie the wildernesses and the "No use crying in the milk even if it's had more than anything else gardens of the unknown, and man's little spilt;" observed Drake, even more cheer- maddened Ventnor into his at- trails are but rabbit runs in an illimitable fully. "I learned that at the front where tack upon the Disc. forest. But they are home to him. we got so we'd yelp for the food even when I saw her fight against Therefore it is that he scurries from some the lads who'd been bringing it were all it, drive it back. open place or revelation, some storm of emo- mixed up in it." She raised Is e r e The black eunuch squatted a dozen feet away, facing us. . He dropped his eyes and began a slow, curious motion of his long arms, the hands running along the floor upon their talons in arcs. . And now I could see only the hands, shuttling so smoothly, so rhythmically back and forth-weaving so sleepily, so sleepily back and forth- Science and Invention for February, 1928 895

head, and met my gaze. In her eyes I read "You asked-and-you must listen." away from me. I tore it away. And, O both terror and shame. It 'came to me that, When once more she spoke her voice was Louis-Dick-it hurt-it hurt-and for a panitul as it might be fór her, the time for low, curiously rhythmic, her eyes rapt. breath before I ran to him it was like - questioning had come. "I was free- "Ruth," I said, "I know it's not necessary free of every to remind you that we're in a tight place. human fetter of 1J44344~01110» Every fact and every scrap of knowledge fear or sorrow that we can lay hold of is of the utmost or love or hate. importance in enabling us to determine our Free even of course. I'm going to repeat your brother's hope-for what .?. " question-what did Norhala do to you? was there to ,rn;>>_ \\-liat happened to you when you were float- hope for when ing before the disc?" everything de -rf adá "There was nothing," she whispered-then siráble was defiantly-"nothing! I don't know what you mine? AndL- mean!" was elemental, 011r "Ruth !" I spoke sharply now. "You do one with the know. You must tell us-if not for our eternal things- sake, then for his." And I pointed toward yet fully con- Ventnor. scious that She drew a long breath. was-I! Ir "You're right-of course," she said, un- "Out of what steadily. "Only I-I thought maybe I could held me, out of fight it out myself. But you must know- the fires within there's a-a taint upon me!" it pulsed life, a "A taint I" I cried, and caught in Drake's flood of life in swift glance the echo of my own thrill of which I was apprehension for her sanity. bathed. And it "Yes," she said, quietly. "A taint. Some new and alien thing within my heart, my brain. my soul. Something that first came to me from Norhala when we rode the flying block together, and that-it-sealed upon me when I was in-It's ..." she crim- soned, and whispered-"embrace. A thing that urges me to forget you two-and Mar- tin-and all the world I've known; that tries to pull me from you-from all-to drift untroubled in some vast calm filled with an ordered ecstasy of peace. And whose H--- calling I want, God help me, oh, so des- perately to heed! trr/d'/ "It whispered to me first," she went on, breathlessly, "from Á Norhala-when she put her arm ; around me. It world in which there was whispered, a n like coming from a d no disorder, no sorrow, no doubts, a rhyth- and music, ... .- was as though this life mic, harmonious world of light reassembling me, a world that was like a black / . were - into-into : fitting me closer to the and dirty kitchen. elemental things, changing me into them. "And it's still there," her voice rose. "Then the shots. Awakening was- "It's still within me-the taint; whispering, dreadful, a struggling back from drowning. whispering; urging me away from you, from I saw Martin-blasted. I drove the-the spell Martin, from every human thing; bidding me give myself up, surrender my humanity ,,,,,,Ml,,,, .,.,ll.,.MMl,,,,,,,,lll. llll,.,, WM.,MWMMM.M:,,MMMM.M to-to what? then it seemed to "Its seal," she sobbed. "Something that float from her and Synopsis strives to make the human in me a slave- cover me like if - Dr. Louis Thornton is traveling through that waits to overcome my will-and I like a substance, and from head Tibet with his Chinese servant -cook, Chiu surrender gives me freedom, an incredible to foot. It was a quietness and Ming, and two ponies that carried the im- freedom-but makes me, being still human, a white man peace that held within it a hap- pedimenta. They came uptn a-monster !" piness and at one and the same time utterly who introduces himself as Richard Keene Drake. Drake's father had been very She hid her face in her hands. . tranquil and utterly lawless. friendly with Thornton. The three decide be at the threshold un- to carry on and come upon Martin Vent - "I f I could only sleep," she wailed. "But "I seemed to of his daughter. known raptures-and the life I had known nor, a geologist, and Ruth, I'm afraid to sleep. I think I shall never The latter are guarding themselves against sleep again. For how do I know that if I only a dream-and you, all of you-even hundreds of soldiers who belong to an age Martin, dreams within a dream. You weren't at least twenty centuries back. While es- sleep-it-may not conquer me?" caping they are attacked and would have I caught Drake's eye. He nodded, under- -real-and you did not-matter." been exterminated. were it not for the "Hypnotism," muttered Drake, as she timely intervention of Norhala, a tall, standing fully my unspoken question. I paused. beautiful, metallic -haired woman, whose slipped my hand down into the medicine "No." She had heard him and shook her control over lightning and over heavy case, and brought forth a certain potent and metallic blocks was phenomenal. These I head. "No, more than that. The wonder of blocks, at her command, would make a tasteless combination of drugs which carry it grew-and grew. I thrilled with it. I bridge for her to walk on or form them- invariably upon explorations. remembered nothing of that ride, except selves into battling monsters to protect her or obey her every whim. Chin Ming I dropped a little into her cup, and then once when, through the peace enfolding mc, is killed in the battle, the survivors leas, held it to her lips. Like a child, unthinking, there pierced a warning that Martin was in ing with Norhala. Ruth and Norhala get she obeyed the suggestion and drank. peril, and I broke through to sec him clutch- on one of the blocks. The others stand upon a second composed of four smaller "Brit I'li not surrender!" Her eyes were ing Norhala and to see floating up in her ones joined together by their own peculiar tragic. "Never think it! I can win-don't eyes-death-for him. super-normal power. The platforms speed you know I can?" "And I saved him-and again I forgot. through space at a terrific rate, arriving Then, when I saw that flaming shape-I eventually in the court of the Metal Em- "Win?" Drake dropped down beside her. peror. Angered by the influence of Nor - felt no terror, no fear-only a tremendous drew her toward him. "Of course you'll hala over Ruth, Ventnor raises his rifle win. Nine -joyous-anticipation, as though-as though and fires at the red ruby-like object he -tenths of what you're thinking - " she faltered, hung her head, then leaving believes to be the brain of the metal now is purely overwrought nerves and weari- that sentence unfinished, whispered: "And monster. He is struck down by a lance ness. You'll win-and we'll win, never of green flame and rendered unconscious. doubt it." when-it lifted me it was as though I had The metal monster gives Norhala the en- come at last out of some endless black tire company to serve as her toys. She "I don't," she said. "I know it- It will ocean of takes them to her home, where she in- be hard-hut I despair into the full sun of Para- forms Yuruk, her ape -like eunuch at- will-I will-win--" dise!" tendant, they are not to be harmed. Vent - Her eyes closed, her body relaxed. The "Ruth!" At the shocked wonder in nor talks then lapses into unconsciousness potion had done its work quickly. agair. Now go We laid Drake's cry I saw her wince. on with the story. her beside Ventnor on the pile of silken "Wait." she heid up a tremuious band. ((a,rhn red on page 937) 8% Science and Invention for February, 1928 SCIENTIFIC

A Photographic Picturization

The entire world is anxiously watching the progress of aviation. This science is leaping forward so rapidly that it is almost impossible to keep up with its prog- ress. There arc advances in the small plane field as well as those in the passenger carrying and freight carrying types. Rapid strides are being taken to eliminate It looks like a toy, doesn't it, yet this airplane, with a stalling in the air-the latest discovery will be described in the March number. wing span. of . only 14 feet and powered with a 20 -horse - power motor-is, 'without a question, the fastest, smallest plane built. Speed -140 miles per hour, with Jack Erwin piloting.

f --,2f fr1r r,

i1=122.027:2

1 V1 It

liilk, J _ -111 - --.7".=.j5-1 N ,,.-_,.-- y ,.. - . :-

-_ J Were P. T. Barnum still alive, he could capitalize on this immense machine indicated above. It á stands about 15 feet high. How would you like to be the mechanic to repair it? The what -is -it happens to be a new British engineering triumph in the form of a ma- chine for making a million bottles a week. It sure is a formidable looking object.

t,

Axel Bisguard builds boats of

. newspaper. The newspaper is - `.-1EN cut up in the form of strips 1 inch wide and laid on a Attempts to graft hair into the head h . wooden form, after being wet. been varied and numerous. Here is another J After this, layer is glued on system slightly different, invented by Prof. v layer until a shell containih,; Christian Askhaven, of Oslo, Norway, oper- about 30 thicknesses is formed. ating on Miss Peggy Tudor. He plants the The entire shell is then re- hair in the scalp by the aid of a fine gold - a . moved from the wood, sand- spring which acts as an anchor. It is claimed papered, varnished, shellacked that the hair remains alive permanently- . f4 and fitted with deck and sails. this is doubtful. Science and Invention for February, 1928 897 PROGRESS

of Modern Scientific Advances -

But one must not suppose that the progress in the scientific world is only in the direction of aviation. Everything from garden furniture to baldness cures WY. s. is receiving its share of well deserved attention. Toys and games are becoming more wonderful and more startling as each new invention is announced, or as the new developments are brought to the attention of the public. Today is indeed a day of progress; perhaps the entire world will move strictly along scientific lines tomorrow. It, therefore, pays the modern student to keep abreast of science be- %-.- ' 1 cause as it develops, so will the student develop. f

The photo above shows Pierre Chevreau, on the right, explaining his newly r -- -invented landing gear to his pilot, Peuillox. Observe the cater- pillar treads. The plane actually took off in recent Paris test flights. -w - r7 r..-- I

G,

Here is something new and unique 5 in the line of golf courses. It is made almost entirely of pieces of pipe, wood, and bricks, which form the various obstacles.

In the front yard of the Astoria Gas Co., the Cameraman discovered the peculiar golf course where the hazards are made of pipes and pipe fittings and loose_ brick. The course itself is a nine -hole affair, and occupies but very little space. Because of the numerous obstacles, it cannot be covered with but a few strokes and, moreover, requires much skill.

` . y>.Z á; .ir í+ Would you like to do some work in your garden during the winter months? If so, you can start by gathering quite a few choice cobblestones from neighboring hillsides for the construction of this startling yet decorative flower basket.

The photo above shows the dining room of the This touring house is fitted with two Road Yacht, the newest sleeping cabins, an electric galley, a writ- idea in motoring. This ing desk, a table, a radio receiver and a is really a touring house phonograph. There are book shelves on or, had one better Say, the wall and there is a complete lavatory. a palatial yacht on It will accommodate five people. Its over- wheels. The driver's seat all length is 18 feet. It is 6 feet 6 inches is not occupied during wide, and the wheel base is 12 feet. A meals. speed of 45 miles per hour is easily ob- tained over normal roads. Because of its multi -windows, the tourists get an abun- dance of sunlight. Curtains in back of the windows give them as much privacy as they desire. 898 Science and Invention for February. 1928 New Rotary Valve Auto Engine

Revolutionary Design of Valve for Gasoline En gines May Supplant Present Poppet Type

aa,

-^.- ~ .

:i 4., .

Above we have a photograph of one of the rotary valve engines which Another view of the new engine was used on a car since May of appears above. The rotary valve engine this year. shaft revolves at 4,000 revolutions per minute.

AROTARY valve for internal combus- mechanism and other parts. A special pack- cylinders. This disposition of the several tion engines has recently been invented ing has been adapted to prevent leakage valves and time relation by F. Mayer, of St. Louis. of the firing of Joseph The between the valve and the wall of the bore the several cylinders are such that one cylin- engine can be constructed cheaper than those in which the valve is positioned; thus all der fires immediately after the other. Pas- used on the present sages are day. motor cars, and arranged give an increased so that they serve as will common or combined mileage per gallon of inlet or discharge gasoline for automo- ports for their re- biles of any descrip- spective cylinders and tion. The three main features of new the valve ports. The the head ports are so lo- motor are: one valve cated that when the covering two pistons, valve member is ro- a shoe which pre- tated, the ports are vents leakage of gas, adapted for registra- and a lining of ray- tion in turn with the is kept bestos which head ports, in proper continually soaked sequence for the op- with oil. This engine eration of the engine. turns over at 4,000 Within each valve revolutions per min- member is a fixed ute and can be read- wall, the ends of ily applied to any which arc radially four, six or eight disposed in opposite cylinder car. The directions and engage motor was installed the inner face of the in a small coach and Above we have a drawing showing a view through two of the cylinders. The rotary valve is also shown. wall of the valve. made a run for four- Each valve is thereby teen hours, with an average speed of 41 parts, with the head, are conveniently re- provided with discharge and intake cham- miles an hour, covering 28 5/8ths miles on moved or detached as a unit whereby easy bers, one chamber having a portion dia- a gallon of gas. access may be had to the interior of all the metrically opposed to a corresponding por- The principal features of the rotary valve tion of the other. The interval of time motor are an axially rotatable tubular valve between cylinder exhaust and intake has also for controlling the intake and discharge of been reduced to a minimum. The ports are a companion pair of cylinders, and a head in such relative dimensions that on the rota- common to each pair of cylinders. The head tion of the valve one cylinder is exhausting has passages leading into the respective through one port, while the companion cylin- cylinders and each passage serves as a com- der is intaking through the other. mon or combined inlet and outlet, to and The engine as a whole is of comparatively from its respective cylinder. A unique form simple structure and of relatively few parts. and location of packing, obviates any leak- Besides this it is exceedingly durable and age between the valve and cylinders. En- efficient and maintenance costs are reduced gines constructed with the use of this valve to a minimum. The heat imparted to the are relatively simple in form and structure, partition wall by the exhausting gases is durable. reliable and efficient in use and used to warm the incoming combustible operation, claims the inventor. An enlarged fluid, thus facilitating its combustion. Roller sectional view through a pair of cylinders bearings are suitably interposed in the head of an internal combustion engine using the for the valves and another bearing is used new rotary valve is shown in the drawing at the intake end of the valve to take up appearing here. An enlarged longitudinal end thrust. The leakage between the valves sectional view of a valve of the engine is and the hearings is prevented by suitable alsó shown. The new engine may have one packing. A means is also provided whereby or more pairs of cylinders adapted to be the engagement of the valve seats with the fired in a certain sequence. An engine of The drawing above shows an enlarged sec- valves is done automatically, suitable to the this type has a single cylinder head in which tional view of the valve of the engine. The pressure incident to the engine. A rectangu- a rotary valves located. engine using this may comprise one or more pair of are The pairs of cylinders adapted to be fired in a lar oblong valve seat and aperture are used. head also supports the spark plugs, driving certain sequence. A chain drives the valve shaft. Science and Invention for February, 1928 899 Glands Make Giants Not Prizefighters

7=

401111k

L- What over -stimulation of the pituitary gland Over-secretion of the pituitary gland cannot possibly account for the fistic prowess of Jack does do, is to produce giants. If over-stimu- Dempsey and Gene Tunney, shown in the photograph above as they appeared in their last latian occurs after maturity, a condition engagement at Chicago. There are tens of thousands of people who have over -activity of this known as acromegaly is formed. Note the gland, but there is only one Gene Tunney and one Jack Dempsey. The statement that the glands large Jaw and separated teeth on John Aasen, are responsible for the fighter's ability does not hold true, states Dr. Damrau. who is 8 feet, 9'y, Inches tall.

By FREDERIC DAMRAU, M. D. How the Tiny Pituitary Gland, Located in the Skull, May Make You a Giant

FVEN from nursery days, when we and development of our bodies in a most might be compared with telegraphy. But eagerly listened to the story of Jack tyrannical fashion. And, if we wish to find the glands of internal secretion-and this, and the Bean Stalk. most of us have out why some persons attain such enormous of course, applies to the pituitary gland- been interested in giants. Of course size as to justify being called giants, we have an entirely different means of com- we now realize that the terrible monsters must study the function of the pituitary pelling the organs to do their will. They of whom we read in our fairy tales never gland. send hormones-or chemical messengers, as really existed; but history records the cases This little tyrant, the pituitary gland, lies they are called-into the blood, and these of authentic giants, and most of us have in the interior of the skull, a short distance hormones are rapidly carried to all four seen them with our own eyes at the circus. behind the root of the nose. It is connected corners of the body, as we might say. Frederick the Great had a mania for re- by a stalk with the bottom of the brain The hormone secreted by the anterior cruiting enormous men for his personal and lodged in a bony hollow at the base of lobe of the pituitary gland-which is the guard. His crowning glory in this respect the skull. If you were to hold in your hand medical term for the front portion-carries was the Scotch giant, who measured 8 feet a brain hardened by formalin and beheld a message for the bones of the body. And 3 inches in height. Patrick Cotler, an the tiny pituitary gland dangling at the end that message is, "You must grow !" Irishman who died in 1802, exceeded this of its flimsy stalk, you would never dream When the pituitary gland fails in its record by touching the measure at 8 feet that this unimportant -looking little body duty, the growth of the body is retarded 7 inches. In the Royal College of Sur- plays so large a part in dominating our and the bones fail to harden as early as geons, London, one may see the skeleton careers. they should. Children with this trouble are of the famous "Irish giant," Charles Byrne, There arc two parts to the pituitary gland, usually of the roly-poly type and decidedly who was 8 feet 4 inches tall. a front and a rear one. It is only the front, backward mentally and sexually. The ab- Chang -woo -goo measured 8 feet 2 inches; or growth -controlling, portion in which we normally inactive pituitary gland may leave Joseph Winkelmaier, 8 feet 9 inches. The are interested with reference to the subject a permanent impression on the body's de- tallest man in the world in this time was of giants. The rear portion has other im- velopment. The burly thickset individual Machnow, the Russian giant, wlfo stood portant functions, principally the secretion with the short neck, or almost no neck at 9 feet 3 inches when he was exhibited in of a substance that raises blood pressure all, is frequently one whose pituitary gland London in 1905. His hands were 2 feet and increases the tone of muscles not under has failed him during the growing period. long, but we do not have accurate figures control of the will. WHAT MAKES A GIANT as to the size of his gloves. How does the pituitary gland act to pro- Giantism represents but one of the pranks duce such profound changes in the body? Dr. Wilhelm Falta, of Vienna, in his book that the glands of internal secretion may It does not work by way of the stalk con- on Endocrine Diseases, reproduces a most play upon us. \Vhat we are mentally and necting it with the brain, as might be con- impressive X-ray photograph of the skull physically-our personalities as well as our cluded at first thought, but by producing of a giant. This picture fully shows the bodily peculiarities-depends to a large ex- definite chemical substances, which it gives importance of the pituitary gland in pro- tent on the activity of these small glands. off directly into the blood. ducing the condition of giantism. The bony The controlling centers of the body have chamber in the skull which holds the THE TYRANT pitui- PITUITARY various ways of exacting obedience from tary gland-called the Sella turcica because In the case of the giant. it is the pituitary the organs. Messages from the brain are of its resemblance to a Turkish chair --is gland that is responsible. This gland is no responsible for much of this control. This greatly enlarged, thus indicating that the larger than a pea, but it controls the growth method of regulating the action of organs (Continued on page 932) 900 Science and Invention for February, 1928 Enlarging Photos by Stretching. . The large photograph at the left has been stretched in the manner described here. The original photo from which the enlargement was made is shown below. Note the quality of the enlargement which is undistorted and is as clear as the original photo. The size of the enlargement is alone deter- R mined by the thickness of the emulsion and temperature of the water used. Experiments have proven it possible to en- large a photo to ten times its original size, by means of this simple process. Ordinary plate emulsions yield an E -t t enlargement exactly double the size. At the right we have an illustration showing an original and an en- largement which was made from it. In this :ase, the photo has been 11119 enlarged to ten times i its original size. -E7_77-1 Jo, IL ORIGINAL ENLARGEMENT

THE new "Kluni" method, called after hahn of Berlin, amongst other ingredients of enlargement is entirely dependent on the its inventors, works without any enlarg- 14.01% potassium and 4.96% sodium which thickness of the original film and the tem- ing apparatus. It is independent of consolidate the film by means of a chemical perature of the water used for the stretching any electric connection and workable- with action, at the same time preparing it in such solution. The thicker the film and the higher the means at the disposal of any amateur a way as to allow it to be pulled off the the temperature the greater are the stretch- photographer, as the enlargement is caused plate without any difficulty. After placing ing capabilities. Experiments have proven

1 2. 3. . 4. - r .1111111% '- % .,, -;,_' -l _ _ / .a.' 91 .y,l . -, - Í _ IIIIU l . a// dll -1/ I, clOAK PLATE IN REMOVE EMULSION e.SPECIAL cSOLVTION PROM PLATE J'TRETCH EMULSION DRY ON GLASS

e above movie strip shows the various stages in the enlarging of a film as further described in the text. by the stretching of the film itself. The the film into water, it can be easily stretched. it possible by means of this simple process plate, that is to be enlarged, after having evenly and in all directions, to such an extent to enlarge a photo to ten times its size. The been developed in the usual way, is put into as to fit any size plate desired. When dried, exact formula for preparing the solution a special solution containing, in accordance a perfectly enlarged negative of the original has not been given. with an analysis of Professor Dr. A. Jung - .photograph is obtained. The desired extent A. W. Herbert. The Radio Airplane "Detective" AREMARKABLE detector of airplanes series of small holes drilled in a brass plate. An ordinary set of radio ear phones is used has been evolved and perfected recently A very sensitive aluminum diaphragm is to increase the audibility of these vastly at the Bureau of Standards. It is an placed a short distance behind this plate. magnified sounds. This efficient apparatus efficient sleuth for the detection of aircraft that are anywhere from five to twenty miles away from the point where the tests are made. The detection is made by means of sound waves, the apparatus which has been -'/// I / . developed for that purpose being compact ,'i and reasonably simple. // / / SOUND WaiE Here in brief, popular language is the way ¡ in which the modern detector of airplane / / // " The drawing at the right / / // presence works. The sound waves from the shows the principles invisible and -away of op- // / / far aircraft enter a large eration of the airplane de - horn and then pass through an extensive t e c t o r. The ¡ / J OUND P/C/K-1.40 sound pick - up // / / /' / FIMPL/f/ER device and the - / / / / // amplifier may be / seen mounted / upon the truck. // / / / / / Even though the / / I airplane , is five j to ten ,i_ gm. miles dis- / .41 tant. science is % able to deter- LftTJ mine the travel / LV,-....~».. _\ direction of the / ..,- "cloud cruiser" /Y-- with reasonable - ,../ + ` ^' ' M.-, accuracy.1 +--y'

1.91,°r1 The sound waves, speeding has been used successfully in detecting am" with the rapidity at which sounds from an airplane in flight from sound travel s, eventually eighteen to twenty miles away-and it is a reach the device and set in simple matter to distinguish these particular vibration the aluminum dia- sounds. phragm. These vibrations are airplane is in Above is a general view of the receiver used to detect air- If the operation only five planes by sound waves which has been developed by the transformed into amplified to ten miles away, its direction can be Bureau of Standards. sound waves by vacuum tubes. determined. 901 Science and Invention for February, 1928 Gas Detector for Miners By S. R. WINTERS At the right is a view of a new gas detec- tor which has ir recently been I perfected at the U. S. Bureau of Mines. The long tube is held in the hand and the other apparatus is worn sus- pended around the neck. The gas recorder is particularly susceptible t o ADEVICE, that not only automatically records the carbon monox- presence of carbon monoxide, but gives warning ide and is only when the percentage of this deadly gas .is sufficiently slightly affected the by the presence high to jeopardize human life, has been invented at of other gases. Bureau of Mines, U. S. Dept. of Commerce. The principle underlying a device of this nature is the use of thermo-couples for determining the increased tem- G perature of gases when the carbon monoxide and oxy- gen react chemically, in the presence of a catalyst. The thermo-electric effects are recorded by means of a potentiometer. A complete gas de- I: tector includes a blower for the gases, a gas t . soda material. it »; cleaner and purifier and caustic

I The various parts which are used in the construc- rk tion of a gas detector are shown at the left. The reaction of this apparatus being used Above we see a new gas recorder i a1' to a death -dealing gas is in a mine. Sensitive to 1 part in 1.000,000, based on the thetmo-elec- a gas recorder has practical possibilities in tric effect in different coal mines, vehicular tunnels, garages and thermo-couples when air, other enclosures where the health and safety containing carbon monox- of persons may be endangered by poisonous ide, is passed through a gases. A gas recorder of this nature should catalyst surrounding the be serviceable in promoting economy in boiler hot junctions of the ther- furnaces, blast furnaces and other metallur- mo-couples. This device gical and chemical equipment and for prosecut- ~ '! records carbon monoxide. ing investigations relating to them. Handy Motor Lamp In; i,:- 1C-: WI.. ..ROt1ND OrF 1RI1L NO matter how carefully one may drive an automobile, trouble is bound to come up. The trouble light described here is a friend in _.. I j 4 c f IBER. base, attached to a .` I . need. It is a powerful light on an electro -magnetic ' be :_ _' .. l, .r,. ..+_ ten foot cable cord equipped with spring clips. This wire may . clamped to the terminals of the storage battery or hooked on any circuit in the car's electrical system. The light can then be placed on any iron surface, and its magnetic power will keep it there, leaving both hands free to do whatever work is necessary. As an emergency tail light it will *".!tr:=1,0~~1211 stick on the spare rim and stay there no matter how rough the road. The coil and the 21 candle power lamp draw 3.2 amperes at 6 volts. The 6 VOLT MLA) lamp is protected from breakage by a metal guard. The magnet pole "t1 CR faces are ground off flush with the base, and thus the light readily ad- heres to any metallic surface on the car. This novel light should prove especially useful when making repairs on the car at night. A sketch of the device, showing its construction, appears here and should make the details clear to the reader.

Above is a view of the Refrigeration motor lamp in use and Students Study Electrical rl l also a sketch showing the At the left we construction. The bulb is have a view of a 6 volt head lamp of the refrigerating 21 candle power and op- - equipment which erates from the automo- is being assem- bile storage battery.- bled by the stu- Courtesy United dents. Note that Elec. Prod. Mfg. Co. all necesary ap- paratus is furn- offered by one ished and the re- ACOURSE in electrical refrigeration is now being frigerating unit of the larger engineering schools. This course extends over a itself is of the period of three months and intensive training is given to all students. standard house- ín an elec- 9 hold size.- The photograph shows a group of students engaged testing .' Photo Courtesy trical refrigerator of the household type. The refrigeration laboratory School of is fully equipped with all well known makes of household units. Much Erryin both for conducting tests and ' certny. specially designed apparatus is available os .Milwau- experiments on the actual refrigerating equipment; such as heat and kee. insulation tests, detertnination of efficiency, the properties of refriger- Y ants and the like. The course in refrigeration is amply supplemented by laboratory work, in addition to the classroom lectures. in which the essential theory underlying the science is presented. Any student com- for electrical refrigera- pleting a vocational course may register the ,ta 4 tion course. The training given in this three months course covers / .1...4,-.- every branch of refrigeration and should enable the graduate to serv- sl" household units any well known type. As the 1:---:,A ice, repair and install of used in the different machines are all the principles of refrigeration :...t._... same, the student should in fact be able to repair the commercial units N-:-1.- as well as the smaller ones used in the home, with little or no dif- ficulty. Science and Invention for February, 1928 Li -wing Plants in. Sealed. Containers No Attention Need Be Given Ordinary Garden Plants When Grown in Sealed Containers By JOSEPH H. KRAUS

ONE of the most unique systems for come the too impoverished to maintain life, for layer of a- cement made of litharge cultivation indoor a number and of plants is the of years. Before the plant is sealed glycerine is put around the method patented by Raymond H. in its base as indicated Wal- container, a sufficient quantity of water in the diagram. This cement will lace of Livermore, Iowa, under his patent is supplied to the adhere soil. After that the plant very well to the plaster of Paris in the No. 1,621,818, issued to him on March 22, requires no further attention. base. On top of this to finish the job and to fur - The photographs on this page show two plants sealed in glass containers, which, for experimental purposes may be made from large incandescent bulbs. The requisites are few; thus by inspecting the diagram we find that there is a glass base which may be colored for its decorative effect. This glass base is set on the table awaiting the next step in the process of preparation. This consists of taking an ordinary thistle tube, 5 such as the average chemist uses, and by heating the lower end, after having cut it to the desired size, the end is flared out with charcoal or by any other suitable manner so that it becomes quite irregular and more or less enlarged. It is desirable that the base of the thistle tube does not touch the glass at all points; otherwise the water given off could not feed back into the thistle tube. One will observe in the drawing that the very bottom of the thistle tube, therefore, appears more or less convoluted. Having constructed the thistle tube, the next step is to mix some plaster of Paris, pour it into the base with the thistle tube upright and as near the center of the base as can be judged. The article is held there until the plaster of Paris is nearly dry, after which the plaster is cut with a sharp knife or other suitable tool so as to form a cone -like center support. The thistle tube is now filled as far as in- Above is a photograph of the garden variety of Tobacco plant. In the sealed container it dicated with some fine white seashore sand The mimosa or sensitive plant can be grown requires no attention for two years. which serves to convey the water back to under the glass covering. The resulting article is the roots of the plant by capillarity and artistic as well as unique. 1927. In this system he has taken advantage white sand is used primarily for decorative of the more or less "balanced" plant life purposes, any other kind sufficing. The mid- ther prevent any evaporation, a layer of process of photosynthesis and respiration in dle portion of the bowl of the thistle tube is sealing wax is evenly poured: The sealing such a manner as to maintain certain plant then filled with the desired soil well en- wax can be of a color to contrast with the life essentials in proximity to the plant to riched. One must remember that this plant glass base, thus enriching the novelty. be absorbed there. In the process of photo- is to receive no attention for two years or The operation of the system is as follows. synthesis, carbon dioxide absorbed by the more and it follows that the soil should be The process of photosynthesis and respira- plant combines with water, in the presence of a suitable nature to support life. If the tion is carried out within the bulbous cover of light, to form carbohydrates and set free plant thrives best in a sandy soil, the bowl in the usual manner, free oxygen being given oxygen. should contain such material and if loam is off from the plant during photosynthesis, In the process of respiration, the carbo- the desirable cultural medium, this should while carbon dioxide is given off during hydrates formed in the manner just described be here introduced. A very small plant, pre- respiration. It will be apparent that with and the oxygen break down to form carbon ferably of dwarf habits, is then placed within the hermetically sealed container, the oxygen dioxide and water. This latter action takes the thistle tube and a final thin layer of sand and carbon dioxide will be maintained in place in either light or darkness. The oxy- is used to surface the thistle tube. Now, substantial proximity to the plant to be re- gen set free during photosynthesis is taken the plant is watered, an additional quantity absorbed by the plant during its natural up during respiration and conversely the of plaster of Paris is poured into the base functions. Metabolic and transpiration water carbon dioxide set free during respiration is and the cover bulb (an incandescant light will also be retained in the system and will taken up during photosynthesis. In the pres- bulb or other thin decorative glass) is im- he continuously absorbed by the plaster of ent system, both the carbon dioxide and the mediately put in place and allowed to harden Paris. The moisture finds its way down the oxygen set free by the plant are maintained in the plaster of Paris. sides of the cover bulb through the plaster in close proximity to the plant by the sealed Plaster of Paris will permit water to of Paris and up the thistle tube because the container which completely surrounds it. permeate through it. Consequently, in order bottom ends being flared out, permit the The plant need never to be watered. The to prevent any of the water in the container moisture to enter the same. Here, due to Ivater given off during metabolism and trans- from finally escaping into the air and thus the capillary action, the moisture rises up- piration collects on the glass container, making the soil within unusually dry, a thin wardly to be finally returned to the earth permeates through the plaster of Paris sub- and thence to the roots of the plants. Aside base and is again reabsorbed by the plant. COVER BULB from the carbon dioxide, oxygen and water. Not only is the object artistic, but it is ex- the only additional material needed by the CLUB MOSS tremely novel and is unique. plant is supplied by the soil. Mr. Wallace found that his method was Those of us who like to experiment with LAYER OF SAND applicable to all plants of the vascular type. plants during winter months will find this It is a well known fact that bacteria arc an admirable method. It is of course not BOWL OF necessary in the soil in which a plant is THISTLE TUBE absolutely necessary that thistle tubes be PLANT ROOTS rooted, in order to properly support plant SOIL used to hold the plant, but broken test tubes life. Accordingly the soil in the thistle tube with bell tops or for that matter, large test SAND - THISTLE TUBE is selected so that it shall be rich in bacteria. tubes without any flare at the top, could be PLASTER OF PARIS, wire END FLARED Of course, it must be of the necessary THIS PORTION . L employed in much the same manner. These -^ \ SEALING WAX. character and of a quantity according to the POURED LATER L,THARGE AND test tubes will probably enter smaller elec- size of the plant. The soil essentials are AND COVER / GLYCERINE CEMENT tric light bulbs without difficulty. While APPLIED \ PLASTER supplied to the plant through the roots in the OF PARIS GLASS BASE - some plants may not live for as long periods usual manner and it has been found that for CUT AS SHOWN as others by this method, the value of the a relatively small plant, a very small quantity Here are the complete details for duplicating system from both experiment] and practical of soil may bo employed which will not be- the remarkable self-contained plant novelty. standpoint can readily be realized. Science and Invention for February, 1928 903

CfrZSGLItErr~t~a~grvv Conducted by GEORGE A. LUERS

CLEANING THE RADIATOR attend to and considerably improve the ap- pearance of the car. Second hand cars, fre- simple regardless DO YOU KNOW-a DIRECT HOSE FROM quently are in this condition, and method to test gasoline is to burn REAR WHEN WASHING fl have a shabby of new fresh paint, they a teaspoonful in a cup or china dish? OFF `THE RADIATOR. appearance. The resultant tarry deposit or soot To renew the linoleum is only a matter indicates the quality. The cleaner of purchasing about two square yards of gaso- about the receptacle, the better the brown or grey inlaid linoleum, costing line. four dollars, though short lengths can fre- quently be bought for one or two dollars. To renew, remove the front floor boards. 6/ Take off the aluminum binding. Use pliers to draw out the nails, and .avoid bending whenever you want to start it to blowing, OFF horn repairs. WHEN WASHING the aluminum strips. Use the boards as you have steed of immediate FRONT OF CAR, CLOSE with. After So much dependence is put into the horn, DOWN FRONT OF HOOD patterns to cut the covering cov_a cutting, it is advisable to cement the lino- that it is essential for it to blow. leum to the wood with linoleum cement or In the motor actuated horn, three difficul- in the absence of this, use cabinet maker's ties arc frequently encountered. glue. Leave the boards on the linoleum (a) Dirty commutator and brushes. over night, weighting them down with (b) Adjustment needed because of wear bricks or other weights. at diaphragm teeth. this the aluminum bindings can be (c) Broken or shorted wires in the circuit. After is similar replaced and the boards are ready to go The commutator of the horn to that of the generator and this should be cleaned with a piece of RETAINERS USED AS SHOWN, fine sandpaper, never emery cloth SIMPLIFY THE WORK OF REPLACING or paper, each six months; it TIRES. should be then wiped clean with This simple TIR a cloth. Brushes should be long but very enough to bear firmly on com- handy de- vice to be mutator. By means of the ad- In washing the car direct the hose against used in justing screw, the armature is the rear of the radiator, to prevent wetting changing moved forward to compensate the ignition apparatus. tires on rims can be made for wear at the diaphragm. A slight in the horn wire causes up from up at break A great deal of mud is thrown cost. These failure. A grounding of the horn winter roads. resulting in clogging the radi- iron retain- ammeter when when washing is ers are par- wire shows on the ator fins. The inclination ticularly use- the button ís pressed. A ground to direct the hose on the front of the radi- ful when one ator. A safer method is to raise the hood person at- and direct the stream from the hose to the tempts to change tires INCH BY 1 INCH The illustrations below show several back of the radiator. on rims, 4 useful hints to the motorist endeav- The difficulties of starting a motor in cold without the IRON BAR oring to adjust the horn. ignition system will use of a weather having a wet regular rim thus be avoided. tool. If an engine hood cover is used, it is J advisable to close the front flap while wash- WIDTH OF AM METER ing off the car. By doing this it is possible HORN TIRE*RIM to wash freely around all the front area PUSH BUTTON of the car, the hose stream being prevented from entering the engine. back into the car. The entire repair can be done in two hours' actual work and the RECOVERING FLOOR AND cost should not exceed two dollars. RUNNING BOARDS Linoleum on the running boards and the REPLACING TIRES ON RIMS front floor boards of the car, showing holes When replacing tires on rims, it is some- HORN I -1-;=' from wear. is a detail which the owner can times difficult to keep the tire beads down inside the rim, while forcing the opposite BATTERY into place with the tire tool. If the USE FLOOR OR RUNNING BOARD side MOTOR DRIVEN HORN. AS PATTERN TO CUT THE. LINOLEUM. tube and tire slips around, so the valve stem does not project squarely inside the rim, the tube may be strained at the valve; in addition to making it hard to mount the +u PROJECTOR. on with the valve cocked to tire the wheel MAGNETIC one side. This trouble must imperatively VIBRATING be rectified. SCREW-DJUSTING HORN. To avoid difficulties in tire and rim as- sembly, two small "U clips as shown in the above sketch, will prove a most useful aid. These clips can be bent up from one inch by one -quarter inch strap iron in a few minutes. CEMENT These are placed at the sides of the valve, OR GLUE LINOLEUM AND USE rim in the tire; they hold BRICKS TO HOLD WHILE DRYING. after starting the firmly and allow of the fullest freedom to or short in the two wires may cause the horn complete the assembly. These are even more to blow continuously. useful than having an assistant. A horn that goes out of commission on the road, can frequently be brought back, ALUMINUM STRIP IS PUT ON L AFTER LINOLEUM IS CEMENTED. CARE OF AUTOMOBILE HORN by simply wiping off the commutator with If the horn of the car you are driving a rag. The ammeter should read between The Illustration above shows how to carry out you to stop and strike the horn or 6 and 8 when the horn is used. If more the replacement of linoleum on your running requires board or floor. motor -end, or vibrate it with your hand, (Coutinurd on page 928) 904 Science and Invention for February, 1928

Can You Answer These Scientific Questions SCIENCE and INVENTION Magazine readers, especially our thousands of friends in schools and colleges everywhere, .have frequently testified in their letters to the editors that they obtain invaluable help from the columns of this magazine, in clearing up technical questions which arise daily. It is a recognized fact that everyone today, including those of both sexes, are expected to have a fairly good general knowledge of the latest scientific developments and discoveries. It is quite impossible to obtain this knowledge of the latest conquests in science from text -books, as they are usually revised but once a year, and in many cases not as often as that. You will find the questions below a good challenge to your knowledge of modern science, and we advise you to form your own answer, before you turn to the page referred to in each case.

1. What simple principle of applied optics is involved in 6. Do you think it is possible to positively locate oil, or producing natural cloud effects on the modern theatre other underground deposits, by simply swinging a pen- stage? (See page 884.) dulum over the spot? (See page 891.) 2. From your knowledge of electrical and mechanical 7. In what way do you consider it possible for television matters, what horse -power motor would be required to to become a worthy aid to the astronomer in fathoming rotate a six-foot wagon wheel, to which several skaters the secrets of the stars? (See page 892.) clung in order to be whipped off? (See page 886.) 8. Did you know that glass bottles are now made at high speed, entirely by machinery? (See page 896.) 3. How has science recently made absolutely safe the 9. Several million American motor cars have been built testing of high speed machinery, the rotating members with poppet vale a engines in them. Do you think a of which sometimes burst during test? (See page 888.) rotary valve instead of a poppet valve can be success- 4. Through %our familiarity with the huge modern loco- fully applied to a gasoline engine? (See page 898.) motive and its approximate weight, how many of the 10. Where does the pituitary gland lie in the human body? What early locomotives would be equivalent in weight to one is the usual effect of over -activity of this gland? (See of these modern giants of the rails? (See page 889.) page 899.) 11. What is a flash boiler? What is the highest speed which 5. How do the chief operators of the vehicular tunnel a model ship, thirty-six inches long, can attain? (See under the Hudson River know at all times the condition page 907.) of the tunnel atmosphere and the percentage of poison- 12. What are Prince Rupert's drops? Do you know how to ous gas it contains? (See page 890.) make them? (See page 913.)

Trained Salmon A Fish Story By H. L. DILLAWAY

In a large concrete basin, Mr. Charles Lang, of Port Townsend, Wash., gives us a new and original version of a fish story. He has trained salmon trout to answer his beck and call.

Here is a photograph of Mr. Lang holding a hoop and making a trout leap Note the curve assumed by the body through it. of the fish after it passed through the wooden hoop. c l 1-

'5

1 PI, """'t.' The photo at the lent shows a trout t-- coming up to pick a scrap of meat held for it. Photo above shows spectators aN watching the performance, and the one at the right shows a salmon trout nearly out of the concrete basin. An; Science and Invention for February, 1928 "DUNNINGER" MAGIC By NO. 59 OF A SERIES VANISHING HANDKERCHIEF NEW SLATE EFFECT ENCHANTED BALLOT BOX ASCHOOL slate is first passed for examination and may even be marked for identification, if desired. It ís placed RED WHITE --BLUE flat upon an apparently unprepared table and SILK then fantastic passes are made over it. On being lifted, a complete message is found. STUFFED INTO but the method of CONE A slate flap is employed, its use is quite unlike anything heretofore DIFFERENT *., published. The spirit message is previously SIZE written upon the surface of this flap and BALLS then concealed in the pocket of a table top. pocket is covered with strips of gold This THE RED E M PTY braid in a design similar to the one indicated. i` Two small hooks are attached to the edge BALL i S IN THREAD of the flap to engage the slate as it is being THE BOX ATTACHED lifted in the act of picking it off the table. TO VEST HOLLOW WAND of 41/N NII/N PIN HOLE FAKE FOR THREAD r SPRING

POCKET HOOKS By the aid of the wand shown, a kerchief can the room, one of and caused While the magician leaves be pushed into a paper cornucopia three colored balls is put into the ballot box to disappear. The thread arrangement limits balls are concealed. fussing. which is closed. The other those who admire psychical effects, HERE is a new and effective method of FOR this is bound to create quite a sensation. performing the ever -popular vanishing handle, is cornucopia trick. A Wooden box, provided with a of a handkerchief from a to receive one of in the former method made just large enough It is well known that colored balls. The cover of procedure, a double wand had to be em- three differently of the box can be closed tightly and locked ployed and it frequently required consider- as he the wand to in place. It is handed to the magician able fussing with the end of is able to tell method, a fine enters the room, and he produce the effect. In this nature of the ball contained is to the magician's waist- instantly the silk thread tied even when the box is held button which leads through the tube, within the box, coat in back of him. Shaking produces the same is then attached to the handkerchief. In and sound in each event. The effect is obtained the act of tucking the silk into the paper, the sizes, forward draws the by having the balls of three different movement of the hand placed on A nail secretly pushes interior of the wand. The A slate is passed for examination, varying but slightly. silk into the the table and when it is again lifted it the wall of the box against the ball and is broken before the wand is laid a message of greater thread will be found to contain the depth of push determines the color. down on the table or side stand. or lesser importance.

SPIRIT RAPS IN BROAD DAYLIGHT SMALL BATTERIES- --

,Ur- . BUZZER? k- SWITCH TAP BOX

WIRE UP LEG TO BELT 17 PLATE

actually touch any portion messages in the wireless code table and causes the tap box or the buzzer to Mystic table tappings in broad daylight and of the table. When this Is done, the sound comes from a are obtainable with the device indicated. Due to the position occupied by of the wood spectator and his ability impossible to tell from whence the different point, dependent upon the position of the the magician or medium, it is quite out convincingly. sounds come. This is particularly true if the magician leans against the to argue the point the tap box will sound is especially By depressing this plate, either the buzzer or TN order to produce the spirit raps here indicated, a belt manage to press either ele- flashlight batteries; a single pole double - at the will of the operator. If he can prepared with two small the sound apparently comes 'from within and a buzzer and tap box, or gong -less bell. The heel ment against the table -top, throw switch This is ideal for spirit seances and the is made of two pieces of metal, separated by a thin piece of the very fiber of the wood. plate many other ways of utilizing this idea. fiber and is placed under the heel and inside the shoe of the wearer. amateur will find 9Uu Science and Invention for February, 1928 The illustration below shows how the outside shape is cut. Below, cutting out the panel with a piane bit.

Boring a hole to fit the clock.

4J THE making of an alarm clock case from any of the standard brands of together. The bottom or base is made of wall -board is an extremely simple task wood and can be loaded if desired, by boring and the result as the illustrations show, is holes and filling them with molten lead. In very much worth the effort. the piece for the front of the case, listed as Wall -board, known by various trade "D" in the material list, bore a hole at the names, is such a universally used product desired location and to fit the clock, using now -a -days that almost everyone has scraps 411111w'J - an expansion bit, being sure to place a piece of it around the house, and that is nearly all of wood back of the wall -board when bor- that is necessary for the Construction of the ing. Lacking an expansion bit, this hole case shown; that and a little gay colored, or may be cut with the small sharp blade of a ivory lacquer, and a transfer design which pocket knife, or with a coping saw, follow- can be purchased from almost any paint Much of the straight sawing can be done ing a circle made with a pair of dividers. with a back saw. store. The bottom part of Before this piece, which is cut starting the case, by all means se- out to form a panel, may be cut best with cure the clock. A small size will answer a plane better large iron, using it as a chisel and having than a one, and the drawings Alarm Clock Case a block of hard wood under it to receive the shown call for a "Baby Ben." However, by cutting edge, thereby preventing the wall- slight changes in the dimensions the case board breaking off. may be made to fit any ordinary alarm clock. from Wall -Board The remaining parts, with the exception To begin, cut to sizes given in the mate- of the curved pieces marked "J," are all cut rial list, the pieces of wall -hoard, using a By H. L. WEATHERBY square and to sizes given. These curves and fine tooth saw or knife. No nails are used the ones on part "D" are cut with a coping in assembling the parts, tacks as well as Full working details on how to saw or u ith a sharp knife. glue being used in attaching the bottom to Now we are ready to start assembling the the case, otherwise all parts are simply glued build this useful ornament (Continued on page 947)

ALARM CLOCK CASE

- gs , i.09:45.3922

/ Nr

/4

. V/%//lII/// L---t-- \ 101~11M « _--.,----

4

...MATER/AL- ilLL MATERIAL 44 WALL-8OAR0 WITH EXCEPTION OF 843E. I -A -TOP, 2417X .3,i" \ 2 -8 -SIDES 2,1X I- C-SHEL F, /!X 3" \ I-0-FRONT,.5 X91' I E -FRONT, 3-X94 1 /-F-BAGK, .5"X64- - . G-BOAC/NG STRIPS, 4X4 I-H -80T TOM, I4 X3" 2-I- SIDES. 2 X 3 r- - 7 r4://///A 2--3RACKETS. / A 2S - - = 2 -K-SOT TOM PCS. /-X 24 ' I-L -W000 BASEZ X2fxsó' Details of the alarm clock case and a view of the completed clock are hown in the illustration above. Science and Invention for February, 1928 907

. d a./:..,^..L , - i'.4..lt14..v__ . O._hi.:¡yw-a L mZy ::¡S1yi£:'P«i, i0%t'.: -:i' .?. ,a , $ ..,' ,.1 ,_=J ,.,- ^y.1 --- Jl.«rj=S i'::7NS.,.''_..a:'i.zr.- v.4/.{.2-y1 Y'J' f ; Y'''.r./:.v''./''YYLYT.Jr.f./'.1.7.1-.f.79'''..r./'?/L'rrT.T.J.'.^'., ..,Y'lll \,Jtfii yo 1w ñ.wab r, MODEL SPEED BOAT WINS CUP Prize Awarded to Edwin Benzenbere ,

Above we have a view of the model speed boat which was awarded the SCIENCE AND INVENTION trophy for the month of February. The hull is diagonally planked, then covered with silk and white lead, and then the longitudinal planks are added. The entire construction is held together by "toothpick" dowels.

Rules for Model Contest 1. A handsome trophy cup engraved with your name, will be awarded as the prize for the best model submitted during the month. The decision of the judges will be final and will be based on: A-nov- elty of construction; B-workmanship; C- operating efficiency of the model as related to the efficiency of the device which the model simulates, and D-the care exercised in design and in submitting to us sketches and other details covering the model. 2. Models of all kinds may be entered. They may be working models or not, ac- cording to the subject that is being handled. 3. Models may be made of any available material, preferably something that is cheap and easily obtainable. Note large ventilator in front of the vessel 10 provide 4. be submitted in all cases. the the Models must 01 also to cool Good photographs are also highly desirable air for the proper combustion the gasoline and and where the maker does not desire the the ship. model to be taken apart, legible drawings with all dimensions covering parts that are not accessible must be submitted. N this page we show a series of photo- 5. Models should be securely crated and The beautiful lines, protected against drainage in shipment l..../graphs of the beautiful prize-winning of the model vessel and sent to us by parcel post, express or speed built by Edwin Benzen- be seen from will be returned model -boat, can freight prepaid. Models berg, Stuyvesant High School, in New this photograph, when requested. at taken head-on. 6. Models for entry in any particular con- York City. The Wa-Hoo is 48 inches long test must reach this office on or before and has a beam of 8.6 inches and a draft the 25th of the third month preceding date 25 of publication. For instance, models for of 4.07 inches. It is capable of a speed of more than the April contest must reach us on or miles an hour. The position of the flash steam boiler can c before the 25th of January. be seen in the photograph below. One will observe that 7. Address all entries to Editor Model De- partment, c/o Science and Invention Mag- the compartment in which it is placed is lined with azine, 230 Fifth Avenue, New York City. asbestos. The gasoline tank is well up forward. The pipe which projects over the side of the vessel is attached when the boat is running, and takes care of exhaust The photograph below is a top view of the boat steam, preventing any damage to the mahogany hull with the superstructure removed to show the and cabin. position of the steam plank The steam engine has a forward and reverse gear; the cylinder has a -inch bore and a 1 -inch stroke. It is double- h acting single -cylinder type.

1¢- _ -+

_ 908 Science and Invention for February, 1928 Details of the Prize -Winning Speed Boat Prize Awarded to Edwin Benzenberg

-Y r a .- -`.`"_ -__ 1_ r'.7 r. -. -i oC:-!kée ' . ;° . . o. '.-

Above is a photograph of the "Wa-Hoo" and the cup which was The rules of the contest appear on the previous page, where a awarded to it. One of these cups is awarded monthly by this fuller description of the nature of the contest will also be publication for the best model submitted during the month. found.

I I I LL o NG

DECKI CARLIN 11 I I I DECK BEAM CLAMP sf SHELF

'fffi J

r, - °9 i F9 - 1 S! 1y I ¡E, i ¿ J i.i FRAME O W L ° I' bCNif0. O l.K ALUMINUM CAST e, I CHINE 4113` en j

PLANKING O A ill PLANK -WHITE PINE DIAGONALLY PLANKED.

SILK - VARNISH FLOOR KEELSON AND WHITE LEAD TIMBER `

1 "D PLANK- MAHOGANY KEEL LONGITUOINALLY PLANKED 1 III BUTTOCK -4 BUTTOCK -3T

OF FRAME N" BUTTOCK- 2SECTION

AFT BUTTOCK-1LOOKING A

I 111 T

BUTTOCK -2 OF HULL SHOWING METHOD OF PLANKING \IOM MBUTTOCK-1 BUTTOCK -3 4í Iii....., BUTTOCK-aSECTION -Irw 'O OOTKPI i

SILK \ e (4) 0 m WnITE wHl1 PIN: G. ° LEAD . N jI LIAHOGANY N LONGI. °

°

_,K4') .

/ eGr

SECTION OF STUFFING BOX

F -/BRASS /1°111°1 _r kr, = 6-,- o o y G ó ó p ó f-'r,. ro ñ F F F F o ñ v - ... r rr N ra Here we have the complete details'.- indicating the various hull lines of the The boiler bed was cast from aluminum, a with a further after wooden model of the same "Wa-Root' explanation showing how the hull was built up. had been made. The stuffing box was turned out of brass rod. Science and Invention for February, 1928 909

llllll.11' :J'.lJ.rJJ'llJ'.r./'lJ'll.^.11l.J'lJ'lllllJ:/`./',/'.!'J''.l'l,/'l.l',/'Y'.lJ'. f te.'.: EX PaRmE m7T"AÁ41.,

/'l.:P'.J'.7r..sl. 7":1%,

Easy Experiments in Chemistry By RAYMOND B. WAILES

But to show with two glasses, or beakers, just how the process works is very simple. For this entertaining experiment take some Fuller's earth, whiting, clay, mud or any solid which when mixed with water will stay suspended in the form of a cloud or mud for some length of time. Shake up the r_- substance with water and divide it into two glasses or beakers before it settles. To one beaker add several drops of alum solution. For the course of some minutes watch the rate of settling of the two suspensions. The one to whirls the alum water has been added will be seen to clear up in a short length of time. The other will take longer. The principle upon which the experiment works is that the alum hydrolyzes forming an aluminum gel, or hydroxide, which in set- tling, carries or drags down the suspended particles. METALLIC COUPLES The rate of rusting of metals is usually greater if another metal is in contact with it, forming an The spheroidal state of water is easily shown ' electric couple. by dropping water on a hot metal plate. It Metallic couples forms a bright, restless spheroid. of this sort are Copper plating with a Bunsen burner. The SPHEROIDAL STATE widely known. If copper is carried up by the flame and plate mag- itself upon the cold pipe bowl have upon a hot a strip of We often spit stove- nesium ribbon or who hasn't resisted this temptation? But copper plating with a Bunsen burner! The little water rolled up wire is immersed green color of the flame is thought to be how the globule of in ammoni- and danced merrily on the hot surface! And a 2% due to the recombination of the chlorine and how long it remained there! This is caused um chloride (sal the copper to form the copper chloride again. by the formation of a film of steam around ammoniac) solu- the bubble of water. The bubble floats or tion containing a FLAME FILTER rests upon this ever forming layer of steam, bit (0.2%) of copper chloride, In bead tests for those metals giving col- being supported up by it much as a celluloid ored flames when volatilized, cobalt glass ball is supported by the jet of water of a it will become a is used to screen out interfering colors, es- fountain. coated with pecially yellow from sodium salts. Chrome closely adherent alum solutions such as one containing about CLARIFYING WATER film of metallic Some of the most important applications copper. When of chemistry to everyday life are the simplest this metallic cou- of chemical reactions. The purification of ple is immersed water by means of alum when the turbidity in water, a steady stream of hydro- I o gen will be given off, lasting for -1 several hours, but longer, if 0.1% of A metallic couple is shown ammonium chlo- here decomposing water. ride is present in the water. COPPER PLATING WITH A BUNSEN BURNER The majority of chemical experimenters have enjoyed mixing batches of colored fires. For this purpose, copper salts are sometimes used to form a greenish -blue flame. If copper chloride is held in a Bun- sen flame, the flame will be colored green. That this compound actually splits up, form- Chrome alum solution in bottle serves Alum has been added to the left-hand beaker ing chlorine gas and metallic copper when as a good flame color filter in flame of clay and water. Note the difference in for metals. rates of settling. it is volatilized in the flame can easily be tests shown. Hold the bowl of a bubble pipe is high, due to clay or other insoluble sub- (white clap pipe) or other cold porous sur- 35 grams of chrome alum per 100 cc of stance in suspension. is one of the most face in the flame colored green by cupric water and contained in square sided bottles widely known applications of chemistry. chloride. The bowl will become copper will mask or cut out the flame colors of Yet to explain the theory of how this simple plated in a few seconds, and by buffing it, a sodium, lithium, barium, strontium and cal - chemical does the work is often difficult. good polish can be had. This is quite unique; (Continued on page 948) 910 Science and Invention fur February, 1928 ELECTRIC CANDLES By A. BLUMFELD

sub -division of the electric ,light. The desire was to produce it in small units and also Two to get rid of the mechanism for feeding the ARk.; CARBON carbons in the electric arc lamps. In those RODS days, which now seem so far off, these were . constant topics of discussion. O X3.TO6 The Jablockoff candle, in a way, filled both these requirements. It consisted of two 110V. quite thin parallel rods of carbon, about %" SLATE OR in diameter and not quite so far apart, and fR BAKELITE BASE held in position by a diaphragm of plaster -o á- THICK of Paris or some similar substance parallel FIG.4 one with the other. Resistance in series with the carbons so as FIG. 2-A to reduce the current flowing We illustrate here a simple form of elec- through the arc. tric candle on the above lines, with which the absolutely required and it was experimenter in electricity can dispensed with do some en- in many cases. Like its predecessor, this tertaining work. Fig. 1 gives a view in gives quite perspective. a small arc and to that extent the FIG.' The two carbon rods of dimen- Jablockoff candle, sions as quoted operated to sub -divide the The electric candle which operates without are carried by two metallic electric light into relatively small units. any mechanism. Notice the slot in the base blocks. These blocks rest upon a 2 -inch base (in figure 2A) to permit the adjustment of shown in Fig. 2, the distance between the carbons. A-one of them is held in fixed position by a screw passing through a FLICKERING SIGN round hole in the base; the other is held in BY LESLIE F. CARPENTER WHEN the electric light was first in- position by a similar screw passing through A sign that will attract attention anywhere troduced, the arc light was the form a slot in the base, so that the distance apart can be made as shown in the diagram. employed; the incandescent filament of the blocks and consequently of the car- lamp had not yet been produced successfully. bons, can be adjusted to suit. Fig. 2B gives SPARK WAX The great requirement was said to be the sectional views-the lower figure is a ver- COI L tical section of one of the blocks. The carbon is shown in black, reaching down through the brass block. To its left is seen the screw fixing the block on the base and on the left face of the block is seen a screw BRASS BLOCKS by which the wire carrying the current is TO LIGHTING CIRCUIT HOLD CARBON to be connected. Immediately above a hori- -10 RODS zontal section is given of the same connec- In Fig. is 6 V. i.í 110 V. tion. 3, the candle shown all mounted with a wire coil surrounding the A very pretty experiment applicable to pro- carbons to produce a field about the arc. ducing flashing electric signs. 0 0, - 3 Then in Fig. 4, it is shown connected in a 110 -volt circuit, a resistance being in series A fine wire is FIG. run from a spark coil to Z -B FIG. 3 with it, so as to cut down the current pass- each light and is fastened with sealing wax ing through the arc. near the Sectional views of the base blocks, which hold tip of the bulb. \Vhen the coil is the carbons; also (in Fig. 3) the establish- It will be observed that there is no dia- running each light flickers and it presents ment of an electro magnetic field around the phragm between the carbons. It was found a novel sight. Colored lights make it even carbons. ill early days that this diaphragm was not more attractive. Novel Electric Furnace By S. R. MOORE, Reporter, No. 1993. THE experimenter who desires to work Upon completion, having exercised a little While certain mechanical with high precision and temperatures and products care and skill, this furnace will be found to standard products may be lacking in our made with their aid, such as calcium possess features not unlike those contained domestic product, there is still much carbide, coke, is satis- etc., greatly handicapped by in furnaces sold by large supply houses at a faction for one who can really use and oper- the prohibitive prices asked for furnaces price many times as great as the original cost ate a self-made piece of essential apparatus which will accomplish such work. of a home-made product. for' the laboratory, such as an electric fur- The writer is herewith offering an electric nace. furnace of the crucible type, designed by The applications for a furnace of this himself, and which will, when properly and nature are almost innumerable. Aside from carefully constructed, give extreme CAVITY FOR REFRACTORY COVF,R service CRUCIBLES\ , being used to fuse small quantities of various and satisfaction. 1._,_____, metals, heat treating, preparation of various As shown in the sketch, the body of the \ - _ chemicals compounds such as calcium car- in .\_, furnace is itself simple, being a flower bide, etc., it will give good service as a heater pot of suitable dimensions, or a crucible of for glassware, FLOWER as distillation flasks, beakers, some refractory material, such as silica, lime- .y1 and retorts can be heated by it very satis- stone, magnesia, or alundum. A standard POT -+;.11,;( factorily. 110 volt porcelain base socket is mounted by FIRE means of two bolts upon the base or bottom - CLAY of the crucible. The type resistance plug 1;1,1: unit which may be obtained from most elec- TESTING SPARK PLUGS trical supply houses for fifty or sixty cents Connecting a Ford coil with its three ter- is then screwed firmly into the socket. RESISTANCE minals the plug is connected by special clips Sufficient fire -clay or other refractory is 110k A.C.OR D.0 UNIT to save trouble and time and the secondary then mixed up and placed in the bottom of of the coil is connected so as to produce the crucible so as to completely cover the a spark when the switch is closed. The great porcelain socket. The sides of the crucible II0 V. PORCELAIN BASE point is to have all the connections very are also covered with an inch or two of the PORCELAIN TUBE SOCKET EMBEDDED good. It is even advisable to solder the wire cement so as to leave a cavity in the center IN FIRE CLAY to the spark coil. After a little work on about 21/2 or 3 inches in width. This is to different plugs the eye will learn to discern hold smaller crucibles to be heated, etc. a good plug from a had one by observing. the fire clay coating, wires are The illustration shows a very simple electric the appearance Previous to furnace made inside a flower pot, and depend- of the spark and the work connected to the terminals of the socket and ing for its heat upon an incandescent coil of can be done very rapidly. Sometimec on are led out through a porcelain tube passing resistance wire. This furnace is designed for cleaning a spark plug a good spark will he near the the production of rather a low degree of heat, produced. If through one side of the furnace, compared with that given by an arc furnace. cleaning does not improve it, a base. These are attached, when desired, di- and will be found a most useful adjunct in new porcelain should be obtained or the plug rectly to the 110 volt D.C. or A.C. circuit. the laboratory. may be thrown away.-Harry E. Hudec. Science and Invention for February, 1928 911

-lll.JL:lJllllLiZj3lLl./SIL-ItYll %.!L/'l_JlJ-lJ'.JLYiJ^lJLII/',vZY.JLSJ'JYLZllll.MYYlJ( ::11,z << iiiw' .r, 3: .'i:.r"fi li ?} , :': wt.,

. z

J`JYL^'1..Y.J'S/C.l1LWY.JL'111+1/'lllrLYi!`ltN /'JiRM/f.^/-zN/lJalJiYl -.. l t %L 1 Y - -

Making an "Electric" Bull By HENRY TOWNSEND

horn may be placed Below is an illustration showing the finished "electric" CURTAIN---,1- Lion. An electric auto bull and how its movements are controlled. The inside of the bull to simulate the roar. Two crooked path of the bull is under control of the SLIT FOR OPERATOR' switchboard operator, who is concealed behind a cur- glass eyes are used behind which electric tain with a slit for viewing its movements. lights are placed. An electric contact is arranged in the position of the bull's heart. When the matador's sword strikes this an electric bell rings and the hull is "killed." The wires leading to the motor and solenoids are connected to a switchboard. This switch- board should be concealed and a small opening allowed in the concealing partition ------"-----OKED PATH or curtain, so that the operator may view OF "BULL' the movements of the bull and the matador UNDER CONTROL prove OF SWITCHBOARD OPERATOR at all times. A bull of this sort will to he admirable for amateur stage presen- tations, and the only "blood" spilled will he the sawdust from the "wounded" bull. ELECTRIC CABLE The head of the bull should be mounted FOR CONTROLLING "BULL" upon springs which will give a more real- istic effect to the bull fight.

ELECTRIC CONTACT LEATHER A bull, constructed as the one shown here, will REAL HORNS IN POSITION OF HEART. HIDE provide a great deal of amusement. For staging IF SWORD HITS IT, BELL RINGS. "bull fights," it will prove to be ideal, and its movements are under the control of the operator at all times.

At the right we have a Aelectric bull should prove to be a drawing showing the constructional details of novelty as well as provide a new means the electrical bull. An of lodge and club entertainment. With electric motor mounted a beast of this sort, bull fights can be carried upon the base provides ELECTRIC LIGHTS for the propulsion of the BEHIND on without endangering the lives of the bull, while two solenoids fighters. The bull is made with a strong are used to steer it. A GLASS EYES frame which may be filled with sawdust spring is used to keep and then covered with a leather hide. The the wheels normally STEERING straight. An electric con- WHEELS bull is placed upon a wooden platform fitted tact is placed in the ELECTRIC AUTO HORN with wheels, two of which are used for position of the heart and FOR -BULLS ROAR" if the sword hits it a steering. A motor is mounted upon this bell will ring. An auto fr platform and enables the bull to move for- horn is used to imitate SOLENOIDS ward or backward. Two solenoids are the bull's roar. Real qw ^ steering horns are fastened upon 1P11P TO -STEER -BULL placed as shown and provide the the head and two elec- apparatus for the bull. A spring is used to tric lights are used for \v'AiW' O TO KEEP WHEELS keep the wheels in a normally straight posi- the eyes. NORMALLY STRAIGHT Patching Water Tanks Emery Stand 'A patch bolt, v hich The emery stand can be used for tanks in the photograph containing liquids, is was made from a 60- INSIDE shown in the accom- pound rail, four LAMP WICK panying sketch. A inches high, and fee GR AM MET wagon bolt with its hack -sawed to a head cut as shown width of 41/2 inches. is used. A gram - It. has one-half inch e met of lamp wick is bearings, a shaft, x U made and a washer pulley, collars and METHOD OF WASHER and nut is secured to thrusts. These are ATTACHING fit the bolt. The bolt all turned from one REPAIR PLUG is tilted and inserted solid piece of cold, in the hole. A file rolled steel, thus sim- o . mark on the end of plifying the work of +r.. the bolt shows the turning all these MARK position of the head pieces separately. which should be The bearings are of across the slot. The bronze. A washing TEE HEAD, FORMED illustration shows the machine motor, with FROM WAGON BOLT correct position of a two inch pulley The above photo shows an emery stand which the head. The meth- turning 1,700 revolu- was made from a 60 -pound rail. A washing per minute, op- machine motor provides the motive power. The od of attaching the tions motor turns over at about 1,700 revolutions plug is also erates the wheels.- per minute, and operates 4-inch wheels Above we have an illustration showing tank repair the repair plug. shown.-G. A. Liters. Vincent Negrette. of this stand very nicely. 912 Science asid Invention for February, 1928 Some Experiments in Luminescence Interesting Experiments Anyone Can Make with Easily Obtainable Materials, Such As Sugar By RAYMOND B. WAILES

A small doll coated with a sub- fluorescent A carde coated with phosphorescent zinc sul- A pretty experiment can be performed by stance will glow with rainbow -like hues phide, is partially shielded and exposed to red when exposed to the action of ultra -violet coating a card with pulverized sphalerite light. Upon examination it will be found that and fixing this disk to the shaft of a toy rays. Some of the substances which can the exposed portion has become considerably 1 be used in this experiment are: quinine motor. When the motor is operated, a dimmed. This may be taken as a rough proof shower of sparks will fly from the disk solution, vaseline dissolved in carbon tetra- that light of long wave length tends to ex- when chloride and a solution of fluorescein. it is touched, much like those which tinguish phosphorescence. come from a grindstone.

.4 a, -H

«1- ¡.

-1 In order td tfp but die" 1imitiesTceñf propertiei Another view of the phosphorscope appears in Glass of certain substances, a simple phosphorscope the above transmits some ultra -violet light. If. photograph. One of the test tubes however, some sunburn lotion is can be made. The completed device can be can be insulated or exposed to the source of smeared upon seen in the above photograph. It consists of the glass and the glass interposed between the light by means of a movable brass strip. Sun - lamp and the object, it will no a block of wood having two holes large light or a carbon arc may be used. longer or only enough to admit test tubes. very slightly fluoresce, showing that the ap- plied cream has shielding properties.

F you will take a lump of sugar into a luminescent. The experimenter can spend a carbon arc darkened room light, etc., by means of a and when your eyes many an interesting hour experimenting with movable brass strip which can have become accustomed to the dark, this be separated substance. from a fixed brass strip by means of two break the lump in two, you will see If a card be coated with phosphorescent screws. By having faint flashes light a straight edge the mov- of shoot out from the zinc sulphide and exposed to sunlight, it able strip can be brought fracture. This is even with the the simplest experiment will glow vividly in the dark, the intensity fixed one, thus shutting out which you can perform in that mysterious of the light to the the glow decreasing with the lapse of tube inside. Of course a hole must be and fascinating realm of light vibration. It time. half made If of the card is covered or in the wooden upright where slit is. is due to a form of luminescence and is called shielded the The with an uncoated card and exposed tube which is not exposed is used as the tribo-luminescence, and is caused by the part- to red light, and then examined, it will be control tube, a standard ing of the sugar crystals. Crystals of sali- or the same sub- found that that half of the card which has stance as is being used in the experiment cylic acid also produce this effect when been insolated or exposed to the "red" rays being placed in fractured, as do this one. The ray of light those of potassium sulphate, will have become considerably dimmed. This coming through the narrow slit and arsenious acid. is will cause a a rough proof that light of long wave beam of luminescence to be set up in cer- Sphalerite is a mineral, zinc sulphide in length tends to extinguish phosphorescence. tain solutions. composition. The tribolutninescent variety It is likewise true that waves of short wave- Sometime ago the writer of this mineral will described in this give off a shower of length have the power of causing phosphor- journal for October, 1926, an ultra -violet sparks when a hard object is passed across escence. filter box for use in its surface. The experimenting with stroke of a finger nail will There are many substances which have ultra -violet light. It consisted of a light cause a trail red of scintillations to appear. luminescent properties. Some of the com- tight box having a special glass front A pretty experiment using this mineral can mon ones are: acid solution of a quinine through which only be the near ultra -violet performed by coating a card with the salt which can be taken from a quinine cap- rays could pass, shutting off practically pulverized mineral and affixing the disc all to sule, lubricating oils, vaseline, anthracene, of the visible radiations. This box can be the shaft of a toy motor. \Vhen the motor calcium sulphide and other earth sulphides, used in a very pretty experiment is operated, a which shower of sparks will fly from solutions of aesculin, which is derived from should be performed with a carbon arc lamp the disc when touched, much like those from the sticky buds of the horse chestnut tree, set up in front of the glass. an emery wheel or dry grindstone, acting on erythrosine, fluorescein in alkaline solution, It consists in exposing a doll, dressed in steel. anthracene in carbon tetrachloride solution, a fancy costume which has Varnish or been painted with glue can be used to coat the eosin, etc. fluorescent substances to the action of the disc. Spread the adhesive upon the surface In order to try out the above substances ultra -violet rays. When the and when little doll is tacky sift or sprinkle the powdered to determine their luminescent properties placed in the box without the arc lamp go- triboluminescent sphalerite upon it and dry. a simple phosphorscope can he made. The ing, one call see nothing. But when One of the the arc most phosphorescent substances photograph shows the completed device. It is struck. the little lady stands out in much known is luminescent zinc sulphide. This consists of an upright block of wood having splendor, her clothes glowing with beauti f ul emits a greenish luminescence after being two holes large enough to admit test tubes hues caused by the fluorescing exposed of the sub- to sunlight, or to ultra -violet rays. carrying the solutions under examination. stances used. Some of the substances which It is used, mixed with a radio -active com- One of the tubes can he insolated or exposed can he used here have been given previ- pound unon watches and clocks, making them to the source of light which can be the sun, ously. Science and Invention for February, 1928 913 Making Prince Rupert's Drops By RAYMOND B. WAILES

l r. 7 "_r-

e

small made a Meeker burner The drops will withstand heavy The drops will explode with a loud report when the The Prince Rupert's drops are with a pair of pliers. and are dropped into a beaker of cold water. blows from a hammer. tail is broken off with small pieces. glass is melted and the drops result in the formation of a drop which does the glass apart in hundreds of IF a piece of the shattering are allowed to fall into water, the usual not break into pieces. These are perfect It is advisable to demonstrate into a drops and will exhibit the unusual properties under a beaker or behind a sheet of glass. tendency for them is to shatter and can only hundred pieces. \Vith previous methods used which are characteristic of strained or Sometimes the tail is very hard about two stressed glass. Glass usually breaks when be broken with the aid of a pair of pliers. in making Prince Rupert's drops, Prince Rupert's ín every one hundred trials were successful. struck with a hammer, but one of these per- These drops are termed a very suc- fect drops will withstand a hard blow, but drops or Dutch tears and exhibit unusual However, the writer has found as if made of method for making these drops, and it should be remembered to leave its tail properties. They do not act cessful tests, al- uses a soft glass rodding. such as is used alone. The least scratch or file mark made glass, when subjected to several for stirring rods. Glass tubing can also be upon this glass tip will send the drop flying though visually, the eye cannot tell the dif- used. The glass is melted, as shown in photo- into a thousand pieces.. The reason for this ference between them and the glass of which graph, by means of a Meeker burner, and peculiar behavior is that the glass drop is they were made. The glass rod should be when it is the resulting drops are allowed to fall into under a terrific strain or stress held about three inches above the beaker of chilled by cold water. Molecular forces arc a beaker of water. As these red-hot drops cold -water, and sometimes it will be found will usually at work waiting to free themselves from the fall through the water they that ten or twelve perfect drops can be made many pieces mith a hissing and r: skin of the glass on the outside of the drop. break into succession. plop, but one out of every ten trials should When the tip is broken, the stresses force in A Duplex Phonograph with RECORD TREBLE TONE AUNIQUE duplex phonograph TURNTABLE ARM many possibilities is shown here. This instrument employs two distinct sound ,í ...... boxes, two tone arms and horns. The straight tone arm on the phonograph is fitted with a small sound box and is connected to an ampli- fying horn approximately thirty-two inches C1r/ / J ENO DOOR TONE ACTS AS TREBLE SOUND ARM REFLECTOR _-____

...... \ 50''BASS HORN (FOLDED) BASS TONE 32" TREBLE HORN (FOLDED) TOTAL LENGTH ARM TOTAL LENGTH OF ACOUSTIC DUCT 64" OF ACOUSTIC DUCT 43"

Both the treble -tone arm and the base -tone arm have separate folded horns, placed as shown above. long. The total length of the acoustic cham- sounded in the treble box a fraction of a ber is forty-three inches. The other tone second before it issues from the bass box.- arm has the gooseneck reversed and is pro- Courtesy English and Amateur Mechanics. a large sound box. This is con- vided with BOX TREBLE BOX nected to a horn fifty inches long with a BASS mouth diameter of eleven inches. The com- plete length of this acoustic duct is sixty- four inches. The two tone arms are pivoted in opposite diagonal corners. The object of the reversal of the goose neck will be clear upon examination of tip- drawing, and is done in order to keep the correct needle track alignment. The treble tone arm is of the straight type. The base tone arm has its needle trailing at an angle of sixty degrees with the record. An important fea- BASS TONE ture of this arrangement is the production 4'ág& AT spacious- POSITION OF SOUND BOXES AT ARM of a sensation described as sound 6" RADIUS ness, or the stereophonic effect. This echo TERMINATION OF' PLAYING effect is a valuable feature in obtaining re- The above .illustration shows the position of the The above illustration shows the arrangement of alistic reproduction. The two sound boxes sound boxes at the termination of the playing the two tone arms, which are placed four and one - but a note is The two tone arms are relatively close together. eighth inches apart at a six-inch radius. are reproducing in cooperation, 914 Scicncc and luidcrittuu Jo, 44..ut uwry, 1928

J'llJJYJ'./e1`JYLZJ'.,/Z/7¡YlJ'~..JYr/ilJt/SZ7/Ji/'..I'l.l.i'1Y'Jl_J'lJJll..Y'll.,fLYlJ1Ii!-JllJJlJ''Jll../Z.7 lY'Jf'1'J./.SI 7.001::11171111.17:1111:-T,,i . . . '4'"C.ts.;'y , :.. ti ';i s ¡i4!;'7' 'S' :°¡is i.:;i` 0 Lt,'.::y.St; . t' ¡.. ' :'.. ñ'i ' Íii¡iÑ, jy¡. .`rw1 ` . a.¡iivil! \ 1 r y.¡4' ',t3,15,1;117",-.71` : s "SOP t::r:S ri+tt .r sTvngn _:,YrFt tr,..0.: 1...., +. :S,L'is:: e 'lllJ.ArJllJJIlJ.'rr 1.J".!i/.V1.lJJVl/"1.J=/z.!'l.vY'y/.Jf/JJJ-i3l.l.RNLee/J.rY'JJ../JJ.rjlJL> fJll1`.11 Í -tt! . ARTICLES OF INTEREST TO EVERYONE Making Drawings from Photographs MANY times it placed in a fresh acid is desirable fixing bath, where to make your it from will become .clear. It own drawings should photographs in order remain in this bath for about twenty to show the construc- m in u t e s, and tional details of the then should be thoroughly article in question. washed in clear water. _. - The drawing is made . ---- Blueprints m a y be with India upon ink made from this draw- the photographic print. - ing by making the After the drawii g has photographic prints or been completed, the enlargements on a print is bleached in parchment paper which the following bath: has the usual bromide Hot water....lo ounces Potassium emulsion. Ordinarily it will be found that the Iodide 30 grains photographic print will Iodine 3 grains have to be left in the The print should re- bleaching bath from main in the bath until three to five minutes. The original photograph is above. The the image has turned shown drawing made from the photo is shown here. This bath keeps well. a blue -black and then -Claude P. Fordyce. SMOKE RINGS HOW TO MAKE IT COPYING DEVICE .d articles should be short, descriptive, and include a sketch. Make sketches on separate sheet. Write on one side of paper only. Name and ad- dress on every sheet.

FROZEN MERCURY Mercury is put in the bottom of a con- tainer and a mixture of three parts of cal- cium chloride and two parts of snow is i placed upon it. This will produce a tern-

FILLING TUBE Perfect smoke rings may be The details of the home-made copying made with the apparatus (REAGENTS). device are shown in the above illustration. shown above. If two rectangular pieces of glass are fast- Smoke rings may be easily produced by ened perpendicular to each other, as shown, filling a large can with smoke from a ciga- the device may be used for copying draw- rette, pipe or cigar. A little ammonia poured ings. The reflection of the object is readily into the can, followed by some concentrated seen when viewed from the front. A corner hydrochloric acid will also produce a smoky cut from a cardboard box will serve to hold vapor.-O. Ivan Lcc. the plates together at right angles.-D. Menzel. KITE EXPERIMENT The drawing MEDICINE DROPPER CLIP SPARKS TAKEN KITE STRING at the right OFF HERE shows the The illustra- rRE EL apparatus tion at the - which w a s right shows MEDICINE a bottle clip DROPPER i_I DRIVE Frank inbiy f o r holding WHEELS h i s famous t h e dropper .k/ kite experi- or pipette in BRASS ment which place. Two can be du- FIG..3 FIG.4. loops are FRAM ,1 plicated by formed in a anyone. The piece of metal frame wire, which CLIP "' is insulated GLASS clamps tight- MADE OF F- I BELL by a glass G. 5 ly around 1wIRE GLASS./support and The above drawing shows a number of experi- the bottle. CRANK the kite ments which can be carried out with frozen The lower string is mercury, freezing mercury in box shown in loop in the GLASS z; reeled in or Fig. 3. wire holds SUPPORT --4 / out with a and supports glass crank. the tip of This appara- perature of about 50° Centigrade, and will the dropper, tus is an ex- soon freeze the mercury. Fig. 5 shows while the act copy of loop tube used freeze ii: a at the the original. cardboard to mercury top receives -I. H. More. solid rod.-//. H. Stc'cel.c. Jr. the dropper loosely. -Mitts Mersand. Science and Invention for February, 1928 915 Readers Forum it. SCIENCE AND INVENTION desires to hear from its readers. It solicits caustic or not. So if you have anything to say, this is the place to say of general scientific interest, and will appreciate opinions on Please limit your letters to 500 words or less, and address your letters to comments 230 Fifth science subjects. The arguments pro and con will be aired on this page. Editor-The Readers Forum, c/o Science and Invention Magazine, This magazine also relishes criticisms, and will present them, whether Avenue, New York City.

SPIRITUALISM are devoid of trickery. The editor disagrees with As to the clairvoyance, telekinesis, mental te- you entirely when you state that mental telepathy, lepathy, levitation, etc., they need no explanation. Editor, SCIENCE AND INVENTION: do not exist.-EDITOR.) letter is to get a clairvoyance, clairaudience, telekinesis, levita- They simply My purpose in writing this tion, etc., can be produced. We do not believe clearer conception of your views on the subject of by you APPROVES OF OUR POLICY phenomena. In that one single representation itemized spiritualism as related to psychic be aid of trickery. We say ". . to can effected without the SCIENCE AND INVENTION: the $21,000.00 offer for spirits, you deny that any of these various forms of mani- Editor, any medium or spiritualist who can present any I am very much pleased with the former two that festations are psychical in nature (spirits do not which have been taking, and I heartily psychical manifestation in so-called spiritualism and we take your exact magazines I explain or that he cannot require prestidigitation), approve of your fearless and unrelenting war on he (Dunninger) will not examples, namely. W. J. Crawford, who experi- reproduce by natural means.' . . . "to anyone who fakes of various kinds, especially those that prey mented with the Ganglier circle. This group was such as the "Ionaco. could demonstrate his or her ability to communicate so D. D. upon the sick and afflicted. form of a caught in the act of trickery; have I also look forward to and enjoy very much Mr. with the spirits or to give some definite Home and Eusapia Palladino indulged in it and physical demonstration which in itself was not Gernsback's wonderful editorials in SCIENCE AND wording been exposed. We will grant that the accumu- are inspiring, and no doubt trickery." Now, it appears to me that the lated testimony establishing Mr. Home's levita- INVENTION. They truly of your offer is not without ambiguity, as no genuine are doing their part in hastening inventions of the such) could hope to tions was overwhelming, but this overwhelming future. medium (assuming there are testimony was the result of Home's trickery of fulfill the requirements. First of all, it is necessary Wishing you every success. phenomena and even his investigators. It was not until Eusapia R. GUNNARSON, to differentiate between psychic Palladino came to this country, after having been spiritualism, as a strict interpretation of your offer Burbank, Calif. involving $11,000.00 might conceivably he taken to (We wish to thank you very much for your mean :toy class of phenomena, such as mental kind wishes, which we in turn extend to you. telepathy, clairvoyance, clairaudience, externalized The readers of SCIENCE AND INVENTION motivity. telekinesis, levitation, etc. It is generally ZING STORES Magazine can greatly help in the war on quacks known that such phenomena can be legitimately by letting the editors of this publication know of produced and that spiritualism is not particularly their existence, where they are, what they do, or concerned in its explanation. But do you deny that any information about them that the reader can manifestations ever IN OUR get, without in any way inconveniencing himself. these various forms of psychical FEBRUARY ISSUE: occur except through fraud or trickery? As an ex- The editors do the rest.-EDITOR.) ample, let us consider the experiments of the late Reality of THE MASTER OF THE MORE EXPOSÉS W. 1. Crawford, whose book, "The WORLD (a serial in 2 Phenomena," excited considerable comment Editor, SCIENCE AND INVENTION: Psychic was parts), Part 1, by Jules several years ago. Miss Katherine Goligher Verne. Nearly twenty years In your October issue i read the exposé of Ionaco, medium on whom the experiments were made, Verne and bel -eve you are doing good work in showing up . the after after writing "Robur," Jules turned and I believe the most pronounced skeptic, to the flying machine, and in some of the junk that is on the market. will agree that the phenomena once again to you a call for more, reading the book, 1905, the year of his death, this sequel \t the end of the article gave actually took place. but their spiritualistic origin is, was published. and I believe that the enclosed clipping has all the us consider the "Robur the Conqueror" of course, another question. Or let The inventive power of this aged master signs of a come -along. experience of J. Malcom Bird, whom the Scientific in conceiving and portray- Accotding to the ad. it is a cure-all for all radio purpose of in and his skill American sent on a mission for the ing a dramatic climax remained unim- ills, will do away with static by simply turning a vest igat ing spiritualism several years ago. His hook, paired in this story, even to the end. If dial (which is sure going some), and also increases "My Psychic Adventures," speaks for itself. D. D. anything, he exceeded himself. the power of the set. Home, probably the most celebrated medium in his- BARON MUENCHHAUSEN'S SCIEN- If you are able to look into it and find it as good tory. produced the phenomena of levitation on nu TIFIC ADVENTURES. (1. I Make a as claimed. I would appreciate knowing this fact. merous occasions. The following quotation is taken Wireless Acquaintance; 2. How Münch- I remain as ever, a constant reader of SCIENCE iron, a biographical sketch: "The accumulated testi- hausen and the Allies Took Berlin), by AND INVENTION. mony establishes Mr. Home's rising from the Hugo Gernsback, in which the author in- ADNA H. ALDEN, presence of as many separate persons; the wily Baron's "reincarnation" Schofield Bks., T. IT. ground in the troduces man- and i have heard from the lips of three witnesses in a most amazing and outstanding (We wish to thank you for the lead, and would to the most striking instance of this kind-the Earl ner. You will chuckle with glee over the advise you that we shall gladly look into this of Dunraven, Lord Lindsay and Captain C. \Vynee entire series of the Baron's remarkable static eliminator. Of course, up to the present -their own most intimate accounts of what took exploits, but you will gain plenty of good time, ao static eliminator has actually appeared. evidence on this sub- scientific instruction, too. These are the place. To reject the recorded scientific serial When a real static eliminator will have been de- ject is to reject all human testimony whatever; for first instalments of THE signed, you may rest assured that SCIENCE AND no fact in sacred or profane history is supported by of the year. INVENTION or RADIO NEWS will be the first ago, Dr. Max- THE REVOLT OF THE PEDESTRIANS, a stronger array of proofs." Years M.D. What will to describe it in detail-EDITOR.) well conducted a number of striking experiments in by David H. Keller, motivity with Eusapia happen to us in centuries to come if we telekinesis and externalized ride in automobiles? It is a DIDN'T FOLLOW FORTUNE TELLER'S Palladino which were beyond question, free from continue to ADVICE proofs question which we may well ask our- fraud or deception, as an imposing array of who is himself SCIENCE AND INVENTION: Palladino and D. D. selves. Our new author, Editor, will show. That both Eusapia doctor, gives us a vivid picture with ab- In a logging camp here I came across an old Home resorted to deception in several recorded in- a from sorbing detail of the most unlikely re- copy of your May, 1925, issue of SCIENCE AND stances is a matter to he considered separately sults. Signs of the truth of parts of the INVENTION Magazine a'Itd there read an answer to those cases where such means are out of the ques. story can be seen already in the larger a correspondent's letter about having his fortune tion. In this connection we must consider that the always cities. told. Here are a few things which I venture to power to produce such manifestations is not THE FOURTEENTH EARTH, by Wal- tell of my own experience with a fortune teller. present in even the most celebrated mediums, and ter Kateley. Scientists have steadfastly About the 4th of July, over twenty years ago, that many have resorted to fraud and trickery when that there must be other in- was maintained when I was in Portland, Ore., taking a rest for a the ability to produce by legitimate means habited planes besides our own. This au- couple of weeks from hard work, I chanced to see a spiritualistic absent. The average audience during thor has woven a charming tale around his the .sigtt of a fortune teller stating that fortunes seance is inclined to be gullible and easily deceived. ideas where such planes might be. we would be told for 10 cents. Somehow or other, I But when a group of scientific men, to whom And other stories. always had an idea that all fortune tellers are must accord the utmost respect and attention, pub- psychic fakers and one could never trust them, but curiosity licly announce the genuineness of certain me I had my hand read for 10 under the most rigid and ex- got the best of and phenomena observed ntroduced by Hereward Carrington, that she was cents. My past and future was told to me. the acting tests conditions, we must think twice before former was true, the latter proved to be so later. shooting exposed. If these mediums are so remarkable, "fraud." hey should never have resorted to deception. I was informed that the next time I left the city Referring back to Dunninger's offer, I find diffi- go and to a nice home. Does he mean Employing deceit in even one instance is suf- for a fob I would north come culty in its proper interpretation. I should be prepared to stay there and he happy, reservation that $10,000.00 will be paid to ficient to discard the entire testimony in that without medium's favor. and I was told to marry the man's daughter whose any medium or spiritualist who can present any name was mentioned. For 50 cents more the for- in so-called spiritualism, or It sometimes takes a long time to catch a psychical manifestations A easily mas- tune teller would have told me more things, but I a manifestation, that he cannot ex- medium in trickery. new trick is merely psychical tered, but it is uncovered with difficulty only. felt that I had enough. Two weeks later, I chanced plain satisfactorily to everyone concerned, at the hire out to a suitable job of building a new high- his explanation correct? Clair The argument that a medium capable of producing to same time proving effects tricked because the audience was gullible way which happened to be straight north, some vnyance and telekinesis are considered by many in- from I was one of in so-called and easily deceived or because she could produce, seventy or more miles the city. dividuals to be psychical manifestations a of men shipped out from the employment and granting their genuineness as is indeed a poor one. Too often have scientific crew spiritualism, men placed their stamp of approval on mediums office. We were to stop at the Halfway House for psychical manifestations and not spiritualism, what men were and went on, of who were discovered perpetrating the most blatant dinner. Most of the broke scientist who has made a painstaking study the for so only and the teamster had dinner with the has ever set forth a satisfactory expla- of frauds. Would you commit a crime except I phenomena fear that you may be caught? No. Why then farmer. who several times spoke about wanting a nation? Many theories to account for their phe- young man, and looked at me as though I were the nomena belonging in the domain of abnormal psy- should the medium do so? Magazine means right party. Ile needed somebody around the place. chology have been advanced by such men as Sir SCIENCE AND INVENTION We were with the crew about two days and, as Oliver Lodge. Camille Flammarion, Henry James, that it will pay a total of $21,000.00 for spir- its contest usual some grievance caused a strike to he or- 1)r. Maxwell. Sir William Crookes, etc., hut these itualistic manifestations coming under ganized and the men quit and walked off the job. men of science would hesitate before staking their conditions, and that Mr. Dunninger will pay uncover the That evening I returned to the Halfway House reputation on a "correct" explanation, because they $10,000.00 to any medium if he cannot and asked the farmer if I could sleep in his barn, despite their many years of by which medium acts or themselves do not know fraudulent methods the hut he insisted that I stay in his house, and for that. experiment and research. So I am writing this let- duplicate the medium's effect. matter, stay with him and share what he had. Ile ter in the hope that you will further enlighten me Thus, one would not expect Mr. Dunninger to his various assets and intro- in He demonstrated to me as well as other interested readers, in this matter of turn a double -back somersault the air. duced me to both of his daughters. the name of one psychic phenomena versus spiritualism. can explain that the thing was produced and un- being identical with the name mentioned by the ARTHUR O. HF.IN, doubtedly tell how it was produced, but he could fortune teller. I ant sorry today that in my folly of Detroit. Mich. not duplicate the effect. Neither could one ex- to move on because it not only of a youth I decided (Our views on the subject of spiritualism and pect Mr. Dunninger to emit the voice child, be my misfortune, but their nti-fortum psychic phenomena are quite unbiased. We can an Indian guide, an aged woman and a foreigner. proved to how as well. I failed in everything, and tt'e farm itself enter upon any set of tests with a perfectly open He could tell what was done and it was teas sold for taxes, the old farms- hating died in a mind and a willingness to believe, provided that done. This is what is meant by "will not ex- it is proven, and provided that the manifestations plain." (Contituucd on f u.0 916 Science and Invention for February, 1928

ll ll. L __- -ll/J'f,J'flllllllllllllllll7'lJ'/I/i lllJ'lJTf1J'..ITll lll`ll. '»=.lr : T'í,.347,.y¡ii ::11' i i: . J X{- l¡)'¡U _ ' : .:i YI= - "+S' ' M J. . 'Yyi{ J . ZÚÍa :. tiY, iy4 a:'¿i r. t:s;.+err'rTl H . - c imfiZ 21: r :3=r.ié:i_...ú. ... lllllllllllllJYf/'llllJlJf/'lh -l/illlll.Yl.r :Y.': l./J`llll./lll ^lllllll llll -..- RCIRESEl. SZ FORMULAS ,Edited by S. Gernsback

FUNNEL SUPPORT SPECIAL HOES - RAPID VINEGAR PRODUCER T h e arrange- This arrange- ment at the left ment produces FERMENTED APPLE JUICE provides an air vinegar in a vent which al- f e w minutes lows the air in by allowing AIR the bottle or jug HOLE" AIR fermented ap- MOLE to leave the bot- ple juice to BEND tle or jug with - drip slowly AS SHDWH I out moving up through beech - the + through wood shavings ,Ct5w- í^',+ stem of the fun- which have .,, 45HAVINGS`4V; nel, impeding been inocu- the flow of the lated with AIR r '*'; IBOTT LE i in the ;. l AIR -' liquid acetic acid HOLE+óó,i, funnel stem. A bacteria by HOLE piece of stiff previously iron wire is wetting them FAUCET VINEGAR bent into two loops and slipped over the stem of with vinegar. the funnel. This method saves time and material The shavings besides eliminating the usual splattering of drops are held in a barrel of liquid caused by air bubbling in the which has a number of boles funnel cut in It to admit a plentiful supply of air.- stem.-Arthur Flinner. David Diamond.

POLE LIFTER Fig. 1 shows how an old hoe should be cut to produce a garden tool which will permit cultivat- GEAR REPAIR This method ing both sides of a row of seedlings at the same enables a 2 time. Fig shows the form used for a lawn 3Ri FILE TO person to edging Miller. SHAPE 'take out a tool-Vernon IST. FILE a TEETH The broken pole or tooth is filed post without DRAFTSMAN'S LETTERING PEN flat and shoveling a holes are hole around drilled as the base of s h o w n the post. A ORDINARY SMALL ELASTIC BAND Round steel strong iron ND DRILL stock is pin is first S HOLES hammered driven into iT'ringn a the post and IpIIlII!+IDIIII(iII1fII into these li holes. T b e an automo- steel pegs bile jack is DRILL TWO OR are then set on a THREE plank di- CROSS HOLES filed to the rectly under PEN POINT PEN HOLDER SECTION shape of the OF other teeth. the iron pin. If the 'pole is set unusually deep, BROKEN -S. Pacosa. it may be necessary to remove and replace the TOOTH pin at a lower point on the hole.-Charles B. Carr. An ordinary elastic band is placed on the pen, as shown in the illustration. This arrangement pro- vides an ink reservoir and printing may be done ELECTRIC SEWING MACHINE with less frequet redipping of the pen.-Leonard Keiser, Jr., Reporter No. 27612. BROOM HOLDER AND FILE AID T h e illustra- broom tion shows a The FAN NOrOR holder con- way to con- LEAD PENCIL sists of. an vert an ordi- SOLDERING ordinary ro LIGHT nary sewing IRON hinge with a machine into SOLDER large hole SOCKET an electric i) drilled sewing ma- as shown, in chine. An old one wing. electric fan If a file is BRACKET motor is used coated with and the speed chalk before is controlled 11111.1VCARBON filing steel, by the fan's the chips rheostat. Fig. PENCIL will not 1 shows how FIG. I stick in the to mount the ;: cuts in the motor. Fig. 2 file and FIG.2 shows where , MATERIAL scratch b e to saw t through TO BE work, especia ly when filing on lathe work.- MOLE the fan base. Vernon Miller. -William SOLDERED Seddn. 6 VOLTS-" Small parts or wire may be soldered together with the equipment shown above. The shorter BRUSH OR PEN HOLDER PASTE TUBE HOLDER the pencil is the greater will be the soldering This holder temperature, this must be adjusted by experi- The holder provides an r....__2I -___,.i2 ment.-Contributor send address. shown at the economicaland d left was made neat means SLOT 4 from an old f o r removing RUBBER BAND GUN s i x cylinder tooth paste or automobile's shaving cream SPRING -RUBBER BAND spark distrib- from its soft j utor. Even the metal tube 2" dirtiest Bake- container. As lite distribu- can be BRÁSS RODS tor may be seen 1. cleaned with in the sketch, T- the tube of fine sand- tooth paste is paper and var- 'slipped into nished to pro- the slot in the duce a fine- looking brush - ppper brass BASE, WOOD holder. This rod, and as , . BAKELITE OR , article is es- the paste is HARD required, RUBBER pecially use- knob t ish e ful to drafts- turned. When. men and ar- the EACH SQUARE = I INCH tists, because tube is 1- of the number e m p t y, the .-- 2' -I The construction of this toy is clearly shown in of implements knob is the illustration above. A gun of - rod, -up this type will - it holds and screwed off the and the tolled tube is appeal to parents, as it does not use buckshot or the small desk space it occupies.-William F. removed from the rod.-Herman R. Wallin. any explosives.-Henry Kawecki. Rodenkirchen. Science and Invention for February, 1928 917

- .. :,.- .. .w¡b iL .rti-'t^1+sa:x..it: :yiZSi .4111541.-..441117455112's%i:¡!Sa5. Ly 7. .; nrSybr-Úid ,,i ~ ,Vis !` -..+ 3r t' t . f¡ .r i '' .-_'= , . r, : .,-,,,.. _;, . /;'ó Home Broadcasting a New Pleasure

New Device Attached to Any Radio Set Provides Much Amusement

`!` ,-

o

i... .` 4'

The young lady in the above photograph The distant "station" to is apparently listening intently to some which the young lady was far distant station. In the photo at the listening is shown above, extreme right, we have a view of this and is located in the same "station," which is simply a microphone house. A device of this that is plugged into the detector socket. nature has many possibili- ties for entertainment and -> r there is no end to the The photo at the right shows clearly the novelties which are made small microphone, which can be con- possible. There are many veniently held in the hand. The device other novel experiments comes complete, with a special adapter , r. -r' which can be carried out which fits over the base of the detector and are further explained tube. in the text. EVERY home can now have its own under the rug or around the moulding of the a wooden handle. The adapter for the UX broadcasting station by using one of the room. As most receivers employ one or socket employs a UX base and does not new home broadcasting devices which more stages of radio frequency, it will be have to be fitted with a grip, although this have recently appeared on the market. The necessary to remove these tubes from the may be found more convenient than if the idea is an old one, but has never been worked socket entirely, as they are not used. The base alone is employed. One of the filament out efficiently enough to make it practical broadcasting units may be bought complete prongs and the plate prong are connected to at a low cost. The home broadcasting in- or the experimenter may make one himself. the microphone, while the other filament strument is simply a microphone of efficient The only outlay will be the cost of the prong and the grid prong are left open. design which is plugged into the detector microphone, for the adapter which plugs There seems to be no end to the novelties socket of the radio receiver and utilizes the into the detector socket can be easily made made possible with this device. Microphone audio amplifier. The microphone is placed as shown in the drawing. For those still technique is one of those desirable assets in some room adjacent to the set and the having the old UV sockets in their receivers, that every artist must have, if his or her talent wire leading to the microphone concealed an old UV vacuum tube base is fitted with (Continued on page 960)

TO MICROPHONE 2 A.F. TUBES MICROPHONE TO f MICROPHONE Y LOUD

i SPEAKER h 1 "B" BATTERY SEALING '' WOODEN DETECTOR HANDLE 'WAX SOCKET "A" BATTERY TO "C" WOOD BATTERY -SCREW

APEN G -yOPEN , IIIE MICROPHONE PFFG' F -' k. OUTPUT TRANSFORMER? OLD TUBE BASE UX BASE

USED WITH . USED WITH o U P111,43. ;CBA7TERY ."B^ ' B4TT UV SOCKET UX SOCKETS C. The above illustration shows two methods of making adapters for a micro - Above we have both a schematic and a picture diagram showing toa thl phone, so that it may be plugged into the detector socket of the radio set. n.icsophone is connected. The audio amplifier alone is us^3. 918 Science and Invention for February, 1928 NEW RADIO DEVICES Accessories Recently Developed Which Will Improve Any Radio Set

RELAY SWITCH bottom of the plug. A hole has also been CENTER TAP RESISTOR provided so that the cord of the speaker or

,- 10A.C. CHARGER -S. pilones may be tied to the plug. If the cord is accidentally jerked, the tips will not pull out of the plug, or the tips pull loose from the cord. The plug itself is small, measur- ing only about two inches long, and fits snugly against the panel, projecting out- wardly only about one -quarter of an inch. The flat end of the plug is made of black CT O 11 :i RESISTANCE - If- : bakelite, with the polarity stamped upen it. WIRE $ET , The metal portion of this device has been .f' nickel -plated. -=A"T3ATTERY HORN AND CONE SPEAKER The above drawing shows a view of the new relay switch which can be used in conjunction with any radio receiver employing a trickle charger.

ANEW relay switch has recently been placed upon the market by one of the Chicago radio manufacturers. This device is connected as shown in the diagram. and automatically connects the charger with the TRICKLE CHARGER L''

A center tap resistor of unusual design is shown above. The resistance wire is enclosed in an insulating tube. -Illustration Courtesy Electrad, Inc. RELAY A The TO SET combination horn and cone loud speaker A+ may be seen above. It may be conveniently hung up by means of a small metal ring fast- AN unusual center -tap resistor, which can ened to the top portion. be used to advantage with the A.C. -Illustration Courtesy Osbeck Radio Light Co. tubes, has recently been placed upon the market. The resistance wire is enclosed in an insulated covering and ANEW novelty has recently been the construction o brought is such that this accessory takes up very BATTERY out by a Brooklyn manufacturer. This 110 V. is little space. A.C. a combination horn and cone loud speaker. These two speakers may be used at the same The circuit of the new switch is shown above. time or either one used separately, as de- When the radio set is turned off, the charger sired. The NOVEL CONE SPEAKER is automatically connected with the line. cone is placed in the bottom part -Illustration Courtesy General Mfg. Co. of the speaker, the device, which looks some- FLAT thing like a lighting fixture, can be sus- CONE pended from the ceiling or other suitable line when the set is turned off, and discon- support. The metal portion of the speaker nects the charger when the set is turned on. has been finished in brown. The cone may The winding of the coil in the electro -magnet be adjusted by means of a small tip placed has a very low resistance and the relay will on the end of the driving rod. The cross- trip on .8 of an ampere of current. The sectional view shown below gives one an instrument is finished in nickel, and is of idea of the construction of this new speaker. a small size. This ,peaker is a distinct novelty and gives good 41r reproduction. FLAT PLUG

UNIT

The new speaker, which uses a pleated cone resembling a fan, is shown above. The flat plug, which is a distinct improvement -Illustration Courtesy Fauspeaker Radio Co. over the old style, is shown above. Note the extra hole through which the loud speaker cord is tied. NE\V speaker, using a pleated cone, has -Illustration Courtesy Carter Radio Co. A. recently appeared on the market and is made by a New York manufacturer. The cone may be readily dismounted and folded HE old type of radio plug had many up into a small space when transporting the 1 drawbacks probably the largest of which speaker. The fan portion is artistically was the fact that it projected two or more decorated and harmonizes with the stand, inches from the front of the panel. In which is of a dark brown color. The repro- order to obviate this nuisance, one of the ducing unit is of strong construction andwill largest manufacturers of radio parts has handle a large amount power flat of easily, brought out a plug which fits snugly without distortion. The stand is heavily the loud or phone Above is a cross-sectional view of the speaker against panel. The speaker showing the placement of the horn and cone weighted, so that the speaker will not be tips are inserted into two small holes on the and also of the two loud speaker units. easily tipped over. Science and Invention for February, 1928 919 S. & I. 3 -TUBE A.C. D.C. SET The First Part of an Article Describing the Construction of a Versatile Receiver for Battery or A.C. Operation By PAUL WELKER

with the two audio sockets at the rear of the the panel is attached. This cable is con- baseboard. The sub -panel is held to the nected direct without the use of a plug. All front panel with two sub -panel brackets wiring should be made as short and direct which may be either of metal or bakelite. as passible. Wiring should be done with The binding posts for the aerial and ground flexible hook-up wire, which may be ob- are mounted at the rear of the sub -panel, tained in different colors so that the various at the left-hand side. A small fixed con- circuits can he easily wired and also easily denser having a capacity of .001 mf. is checked in case of trouble. The photo shows placed directly across the primary of the clearly the sub -panel wiring and also the Above we have a front view of the completed first audio -frequency transformer. A vol- battery cable. The panel should be fastened A. C. D. C. receiver, showing the symmetrical variable high resistance, is to the sub -panel after all possible wiring front layout. ume control, a panel connected across the secondary of the last audio -frequency transformer. Since a power r ot ATRULY versatile radio receiver, one tube is used, it will be necessary to employ which can be operated from the an output impedance or output transformer light socket or from the storage bat- in order to protect the loud speaker wind- - teries, is shown upon this page. This, ings. The output impedance is placed at the the first part of an article, will deal with rear of the sub -panel at the extreme right, 8 .1 the construction of the receiver, using stan- with the speaker filter condenser directly dard storage battery tubes. The second part underneath. gin of the article will appear in the March issue A view of the receiver, showing the layout of WIRING THE RECEIVER parts, appears above. The small midget Jack of this magazine and will show how to is placed on the right-hand side of the sub -panel. change the set over for A.C. tube operation. Before attaching the sub -panel to the Simplicity has been kept in mind in design- panel, it is best to wire the audio -frequency has been done upon the sub -base itself. It ing the receiver, and by changing a few end of the receiver and also the filament may be well to .mention in passing that a wires, the set may he readily converted from circuit, which should be cabled if the re- three-quarter ampere filament ballast is con- storage battery to light socket operation. ceiver is to be used with A.C. tubes. The nected in series with the A-. This ballast The circuit used is an ordinary three -circuit battery cable may also be connected before is mounted beneath the sub -panel, as is the grid leak and condenser. After the sub - panel and panel have been fastened together, may be completed, OUTPUT IMPEDANCE OR the rest of the wiring .00025 MF TRANSFORMER bearing in mind to connect the rotor plates of the variable condenser to the grounded side of the circuit. A volume control, con- sisting of a high resistance, is placed across cD the secondary of the last audio -frequency dOÍ transformer. This is situated on the right- 001 hand side of the panel. The tuning con- MF. 9 denser is placed in the center, with the fila- ment switch underneath and the small coil at the left. .0005 MF. After the receiver has been completely wired, all connections should be carefully rechecked and with the tubes in their sockets, 3 the A battery should be connected across .. AMP B wires in the cable. If the BALLAST the battery tubes light when the battery is connected in this manner, it is an indication of faulty 0 o wiring which should he remedied. If the C- C- B+ OCT. B+AMP. B+PWR. not light, one can be reasonably AMP PWR. 90-135 V. 135-180 V. tuber. do sure that the filament circuit is O.K., and The schematic diagram of the set is shown in the above illustration. Notice that all of the filament circuit has been twisted so that the set may be easily changed over for A.C. operation. A variable the set can be given its first tryout without resistance, which serves as a volume control, is placed across the secondary of the last A.F. transformer. fear of ruining the filaments of the vacuum tubes. (Continued on page 961). in OUTPUT IMPEDANCI regenerative hook-up which is simple op- 001 MF- eration and selective in tuning. No distance / OR TRANS., records are claimed for this receiver, but it will give fine reception on local and nearby stations. ASSEMBLING THE RECEIVER It was found that the parts used in the construction of this set could be fitted nicely onto a sub -panel measuring 7" x 16", with plenty of room left for the addition of an A.C. transformer if it is desired to use the new A.C. tubes. The three sockets, two audio-frequency transformers, and output impedance are mounted upon the top of the sub -panel as shown in the accompanying photograph. The grid leak and condenser and filament ballast are mounted upon the underneath side. A midget jack is placed 3 4 AMP BALLAST- on the right-hand side of the sub -panel The three -circuit tuner, variable condenser, volume control and filament switch are be 0 o mounted on the panel as shown. It will o o seen from the photograph that the front A+ A- B- C- C- B+DET. B+AMP B+PWR. panel is well balanced with the main tuning C+ AMP.. PWR, _ 90-135V. 135-180V. control in the center. The detector socket is The picture diagram showing the hook-up of the receiver is shown above. When using a power placed between the condenser and the coil, tube, it is necessary to employ an output impedance or output transformer. 920 Science and Invention for February, 1928 HAYDEN DELUXE By HERBERT In Which the Author Describes the Construction of a Power

THE DeLuxe pon er pack has been especially designed for use with the At the right we have a photograph of the Hayden DeLuxe Super which was power pack, showing described in the January issue of the binding post strip - this magazine. This power pack reproduces and placement of vosumbi parts. All wiring has every musical instrument with unusual fidel- been done with No. - ity and has a remarkably wide tonal range. 14 insulated hook-up The power pack will provide additional am- wire. The three 2-mf. 111 filter condensers may plification for the radio receiver or will be seen standing just replace the old audio amplifiers of the older to the left of the sets with a power unit providing the finest power transformer. ay possible quality of reproduction and will also The power pack has been built upon a :-.1 g i..,..J , furnish B power to the receiver. The en- wooden baseboard so ' tire unit is operated from any lighting that it may be easily , cir- nIew,,. installed in the con- .- cuit using 110 to 115 volts A.C., at 50 to 60 sole containing the Á'Input* - '-'\- cycles. This unit uses two half -wave rec- receiver. r tifier tubes of the 216 or 281 type, and their use is recommended wherever expense and practical considerations will permit. A single - diagram, so that a greater range of voltages these two tubes should light if the connec- wave rectifier will invariably produce more may be obtained. The wiring of the unit tions are all right. The rectifier tubes bum and less power than will a double -wave may be easily done by following the sche- should now be inserted in their sockets. Im- rectifier. An average power pack consisting matic and pictorial diagrams. All wiring mediately upon insertion, they should light, of a single 210 power tube and a single half - should be done with heavy. well -insulated and the glow tube should emit a pinkish dis- wave rectifier will not, under average oper- Ivirc and the ends soldered to lugs or fast- charge. This power pack will furnish "B" ating conditions, allow of maximum advan- ened under terminal screws where possible. potential to any receiver requiring 45 and 90 volts. Simply connect the leads from the receiver to the properly marked binding The completed power posts on the power pack. The two unused pack installed in the contacts of the glow tube socket employed, bottom compartment marked P and -I- are short-circuited in of the console is the shown at the left. tube base and may be used as a safety switch A screen has been to cut off the power upon removal of the placed over the back glow tube. The switch may be utilized by to allow for the dis- sipation of the heat breaking one side of the power -transformer which is generated cord and connecting the two ends of the cut by the tubes. If this cord to the and P of the glow tube is not done, there is a possibility that the socket. filter condensers may If all the tubes fail to light, fault become injured. the may These condensers con- he attributed to a defective power trans- tain wax and if this former primary circuit probably to cord and becomes melted, there plug or light socket. Should the amplifier is a danger of a L_ breakdown occurring. and rectifier tubes fall to light trouble may be traced to the filament wiring of the power transformer. It should he borne in mind that the tubes themselves will not light if tage to be taken from the inherent possibili- TEST AND OPERATION hey are defective and have filaments. 210 broken ties of the tube due to the. fact that After the power pack has been assembled Should the glow tube fail to glow, this may the rectifier system cannot deliver sufficient in accordance Leith the preceding paragraph, be caused by improper connections, broken voltage under operating conditions to allow and the wiring and assembly carefully down condenser bank, develop defective resistance the 210 to a greater undistorted checked with the photos and the diagram, it units, or defective rectifier tubes. Resist- than would be obtained power output from is ready for test. The plug from the power ance units and condenser hank may be tested 171 at 180 a tube operating about volts. transformer should be fitted into the light with a pair of headphones and a battery. In socket ASSEMBLY OF PARTS and the current turned on. The volt- operation, the power transformer- may be- age regulator tube should he inserted and come warm and the rectifier and amplifier The various parts should be mounted on then the two power tubes. The filaments of tubes too hot in ac- to touch. This heating is the baseboard POWER normal, but under no with the DOUBLE CHOKE UNIT cordance TRANSFORMER circumstances should photographs shown r - r- 1 the power trans - on these pages. This ( 4000 OHMS course, 90V. former become too layout, of hot does not have to be to touch, nor strictly adhered to, should the plates of but was found to be the amplifier or rec- the most convenient. tifier tubes become The power trans- 4 MF. red. If the rectifier and double tube plates become former red hot, this trouble choke unit arc 45V may be mounted on one end 11174 , attributed to baseboard, VOLTAGE broken down con- of the REGULATOR! denser bank or im- then the three 2-mf. IMF L proper connections. filter condensers, L_ The voltage trans - output tine input in the power pack f armer and output 110-115 V. may be measured impedance. The six ti with a sockets are placed 50-60 suitable high - of the resistance voltmeter. on one side INPUT FROM FIRST The and the voltage between baseboard AUDIO STAGE the B- and B+90 binding post strip on A-.0U0 SPEAKER the other. If desir- binding posts will be POWER approximately 90, as able variable resis- OUTPUT CHOKE TRANSFORMER this value is tors may be used in F F TYPE UX-210 held fixed Above we have the picture diagram of the DeLuxe power pack. This eliminator -amplifier constant by the glow place of the uses two type 210 power tubes, hooked up in push-pull tubes. in the style. Two type 216-B or 281 half -wave The voltage ones shown rectifier tubes are used. between the B- Science and Invention for February, 1928 921 SUPER "POWER PACK" HAYDEN Pack To Be Used with the DeLuxe Super Detailed Last Mouth

PARTS USED 1 push-pull output impedance. A heavy-duty power transformer is used, 2 10,000 -ohm resistances. one which will provide A, B and C current 1 4,000 -ohm resistance unit. for a push-pull amplifier using two 210 1 750 -ohm resistance unit. 3 2-inf. 800 -volt test filter condensers. ~ ' 31--- power tubes. Two 216 B or 281 type recti- i1r: , fier tubes are employed, giving a full -wave 1 4-inf. 400 -volt test filter condenser. 1 1-mf. 400 .4111. rectification providing a total output current -volt filter condenser. of 130 milliamperes. The choke unit used 8 binding posts. is one of the double type, which consists 2 type 216-B or 281 rectifier tubes. of two individual chokes of 30 henries each, 2 type 210 power tubes. which are enclosed in a metal case. The 1 voltage -regulator tube. input transformer shown in the photographs 7 cushion sockets. is completely shielded and has a center -tapped secondary. It is designed to couple a stage Names of manufacturers of parts for the of straight audio to a push-pull stage. The DeLaxe power pack will be supplied free is coupled to the output through a upon request. Above we have an end view of the power pack speaker has 30 henries showing the six tube sockets which are placed center -tapped choke, which TOOL LIST on the left-hand side of the baseboard. inductance on either side of the center tap. This is sufficient capacity for the output of Pliers, several kinds. power tubes. No output condensers Screw -drivers, several sizes. be 45 and 53 the two and B+45 posts will between are required, as the speaker leads are at the Hammer, hacksaw and blades. volts at no load, as measured by a high - The resistors used Hand drill. be same D.C. potential. resistance voltmeter. Should howling 45, 90 and 400, and Twist drills, several sizes. be provide plate voltage of experienced in operation, it may properly bias for the power tubes. If this Scriber. by loud speaker some a grid eliminated moving the is to be used with your Center -punch. the receiver, if it ap- power pack intended few feet away from present receiver, it is recommended that a Soldering iron, electric or other type. build slowly from inaudibility to pears to up power input plug be used. This device con- Wire solder, self -fluxing or plain solder and ; the use of an anti - maximum intensity or the output of the receiver to the input non -corrosive flux. howl detector tube cap will help. nects

USES GLOW TUBE Another view of the power pack is shown at pack uses a voltage the left. Note the The DeLuxe power placement of the filter - regulator, or, as it is known by its rather condensers, choke unit, descriptive name, the "glow tube." This input transformer, and is across output choke. The two tube is a device which connected half -wave rectifier tubes the 90 -volt output of a "B',' power supply are placed in the first unit and maintains that voltage at a con- two sockets reading value, regardless any variations in from left to right, next stant of the voltage regulator the load applied to the power unit. Without tube, then the 210 the use of this regulator, the voltage supply power tubes and lastly will fall off rapidly as the current drain is the first audio tube. The binding post strip increased. By using a tube of this type, it is placed upon the op- is possible to construct a B -power unit, the posite side of the base- 90 -volt of which will deliver that volt- board from the row of tap sockets. age at all times, regardless of the number of tubes used. The action of the tube in holding the voltage of the output circuit of the amplifier and eliminates the necessity Rule, steel or wood. of any changes in wiring of the receiver. Center finder for dials. constant serves also to eliminate any small and handle be When in 1 three or four -cornered reamer ripples which may present. LIST OF PARTS holes for shafts, operation the tube has many characteristics for expanding panel with a large filter condenser. I power transformer. jacks, etc. in common handle very useful. is low 1 double choke unit, or two single chokes, Small tool and awl One of these properties extremely set, batteries, A'C. impedance which, when combined with 30 henries each. Volt and ammeters for testing the characteristics of a voltage regulator, 1 low ratio audio transformer. etc. 1 push-pull input transformer. 1 countersink. entirely eliminates the "motorboating" ef- pack usually If the power fect which is intended for use results when an at- POWER TRANSFORMER DOUBLE CHOKE UNITI; ---- in conjunction with tempt is made to use r- 1 units with , 4000 Or,MS the DeLuxeSuper, it B -power il O90V should be installed in many forms of am- i plifiers. The voltage the bottom compart- ment of the console. regulator tube re- should in a saving of 00 A wire screen sults be placed over the the number of high - 4$V voltage fixed con- back of the console in back of the power densers required. óÉI cannot be o= so that the heat gen- This tube not in- used with the aver- º0 erated will age run of socket /' o- B jure the condensers. If the pack is used power supply units, VOLTAGE REGULATOR due to the extra load in conjunction with which it imposes up- the present radio re- ceiver, it should be on the rectifier and o filter chokes. How- housed in some suit- ever, the power unit able cabinet, prefer- described here em- INPUT FROM L.5. ably of metal, or a ploys chokes capable FIiiST.AU0I0 .STAGE wooden cabinet may o of handling at least iB be u s e d. Gaseous 85 milliamperes of may be TYPE rectifiers direct current with- INPUT RANSFORMER UX-210 used in place of out core saturation. thermionic type, with These chokes are en- The schematic diagram of the power pace is shown above. .The input from the first audio stage slight changes. cased in metal. is connected to wires marked A and B. 922 Science and Inven'ion for February, 192R Remote Control for the Receiver By JACOB SCHMIDT Simple Home-made Device Controls Receiver from a Distance

,ii r' . 1 %1 :%/- ,,,,/ // ; tIf . '`/%/'i ti%yi Í i RADIO `RADIO OR 14-1_'-' 1; V/ RECEPTACLI ORDINARY -i RECEPTACLE. -AUTOMATIC OR SET-' REMOTE CONTROL SWITCH k 4

t ulti I - J

TWO POINT BELL SWITCH. AUTOMATIC BATTERY STARTER AND STOPPER J/211". `-,, . c., a IIIIQIIH lluIiihI!///f/f///

A remote control switch attached to the radio receiver is shown above. The wiring and arrangement of With the arrangement shown above one can listen in while in bed and the system are clearly visible. set clock for stopping set at night, or starting in the morning. MANY a radio fan has undoubtedly in case he falls asleep without stopping the tion of lever on switch A in the large often wished that he might be illus- able set, the clock will take care of it. The tration. In order to set the clock, turn strip to listen to his radio receiver while radio fan may even have the pleasure of A counter lying in bed, and or stop the clockwise. The radio receptacle to start set being awakened by health exercises or music. and switch B may conveniently be placed automatically, without leaving the sheets. The wiring diagram and of in the bedroom, The device will arrangement and the remainder of the described here enable the the whole system is shown in the large il- apparatus in the cellar. In listener to have just such a convenience and order to oper- lustration on this page. The two small draw- ate the device, first tune in a station, set ings show the remote control switch and the clock to the desired time and set switch A clock. The switch is constructed as follows : to the right if set is to stop and to the A brass strip D about six inches long is left if it is to start in the morning. If the fastened loosely by means of a bolt to one remote control switch is not used, throw in end of plate H. Two electro -magnets A and switch C and the set will operate as usual. Al are mounted on both sides of this. Two permanent magnets arc fastened about an inch above these as shown.. C is a piece of r-- thin spring brass which touches strip D ?- when it is attracted by the magnet. The electrical connections are made to C and H. A Strip D has two iron pieces F and G at- tached to it. When the lever on switch E is moved to the right electro -magnet A at- tracts strip D. The alarm clock should be fitted with a thin brass strip which is at- tached to the lid and is insulated therefrom. RErIOvE Another piece of brass about four inches I, RING long is fixed to the alarm wind as shown in the illustration. Since strip A is soldered HT to the key, it will be found that whenever ANGLEALONG the clock starts to ring, it will turn on its OTTED LINE. axis which is key B, and while it turns the lower end will move in the direction indi- WIRES cated by the dotted in The alarm clock, which is the heart of arrow the drawing. remote this Strip A will thus pass over strip D and make control system, has a thin brass strip The circuit diagram of the remote control fastened to the lid, insulated therefrom with a an electrical connection of short duration, piece of mica. Another piece of brass is at- switch is shown above. To stop the operation tached to the of the set the lever of switch E is moved to enough to make the remote control switch alarm winding key as shown in the above illustration. Strip A is soldered to the left. start or stop the set according to the posi- the key. 923 Science and Invention for February, 1928 RADIO ORACLE addressed we publish questions and answers which we feel are of interest to the novice and amateur. Letters In this department where a personal answer is desired. to this department cannot be answered free. A charge of 50c. is made for all questions

as POWER TRANSFORMER TUBE TESTER of the voltage amid power amplifying tubes, such 201-a, 171, 210, 199 and 120 types. Thoriated (601k) Jack Richman, Jackson, Mich., asks: Radio & Repair the (604) The International filaments are also found in the 200-A type detector the Chicago, Ill., writes: having Q. t. Will you kindly inform me through Organization, tubes. Any of these above mentioned tubes Radio how to build a power transformer to Q. 1. Will you kindly furnish us with a diagram be subjected to the process Oracle with meters a thoriated filament may supply A, B, and C voltages to be used with a showing the hook-up of a tube tester of restoration, usually with good results. for obtaining all of the important characteristics 400 milliampere rectifying tube? of the vacuum tube under test? \. 1. On this page you will find an illustration illustrated a showing the construction of the transformer core A. 1. On this page you will find ELECTROLYTIC CONDENSERS and diagram showing a tube tester with meters for and also the placement of the filament, ionizer, From the readings obtained it (606) J. C. Stone, Butte, Montana, asks: secondary windings. The core is made of No. 28 giving all readings. tell me the critical volt 62 laminations is possible to calculate the tube's plate resistance, Q. 1. Will 'ou kindly sheet silicon steel .014 inch .thick. ages and formation voltages with aluminum plates 2%"s14/4", 186 laminations 6"xlJ", and 125 amplification factor, and mutual conductance. The and grid voltmeter should he of the zero center type, in an electrolytic condenser of high capacity laminations 10%"x1J4" will be necessary for the bat- also give some construction hints? having as great a range as the maximum "C" high capacity tery tpltage to be used and should be of the highest A. 1. An electrolytic condenser of should also can be made by immersing aluminum, magnesium possible resistance. The other meters such as a read as high as the highest voltage used. The or tantalum plates in some electrolyte 6 of sodium and ammonium sulphate, of -'1 solution t .SECO-NDARY ammonium citrate, of potassium permanganate or of various other salts. This type of condenser is cÍ34 GRID PLATE well known among electrical engineers as the Mer- CURRENT CURRENT shon condenser and has been used in crude form by amateur radio operators for years. The choice of e is electrolytes is somewhat dependent upon the voltage IONIZING at which the condenser is to he operated. The -WINDING FILAMENT VAR. critical voltages for various electrolytes is given in _-- VOLTS -`- RESISTOR the following table: 0-100,000 POTENTIO- OHMS\ CRITICAL VOLTAGES METER Sodium Sulphate 40 Volts 400 -OHMS Potassium Permanganate ...... _112 Volts `- -PRIMARY Ammonium Chromate 122 Volts PLATE Volts -VOLTS Potassium Cyanide 295 GRID Ammonium Bicarbonate 425 Volts FILAMENT 445 Volts VOLTS CURRENT Sodium Silicate ...... Ammonium Diphosphate 460 Volts JACK RHEOSTAT Ammonium Citrate 470 Volts SWITCH This critical voltage is the maximum at which the condenser will stand without a large leakage cur rent. N ith the aluminum condenser capacity varies \\ `SECONDARY inversly as the voltage. This means that if the voltage is doubled the capacity is halved. A list of formation voltages is given here: PAIR SPACED COR OF FORMATION VOLTAGE C2 LAMINATIONS 50 Volts 14.2 MI'. Per Sq. In. y- BAT. B`- BAT. 100 Volts 5.1 M K. Per Sq. In. 200 Volts 2.58 MF. Per Sq. In. The hook-up of the vacuum tube tester is MI'. Per Sq. In. SOLID CORE in the above illustration. 400 Volts 1.29 shown 125 LAM'S. When a strip of aluminum is immersed in a solu tion of ammonium phosphate an oxide film is potentiometer may have a resistance of about 400 formed. Thus we have a pair of conductors with ohms, and is placed across the "C" battery so that their surface relatively close together but separated a negative or positive bias can be obtained. The by a dielectric which has a very high resistance. Above we have the details of the power switch shown should be of the double pole single In passing from a lower to a higher voltage the transformer, showing assembly of core and throw type so that both the "A" battery circuit thickness of the gas layer increases and arrives at windings. and the "Ct" battery círcuít are opened, otherwise a new value in a few minutes. Ilowever, in going the batteries will discharge through the potentio- back to a lower voltage, it takes many months be- "C" its first core. The center leg of the core should be assembled meter. The resistor in the plate circuit should be fore the thickness of the layer reduces to This should be placed in giving a resistance up to the capacity is not the same with from the 62 laminations. of the variable type, value. Thus a vise and tightly bound together with tape. The 100,000 ohms, so that the plate voltage may be reversed currents. 'fo have equal capacities both of battery con- plates must have equal winding which consists of 160 turns changed without changing the "B" ways, both of the condenser wire is wound on a wooden foam, nections. The rheostat should have a resistance and must be formed at the same voltages. Nprimaryo. 14 D.C.C. areas is securely taped, and then slipped over the center suited to the tubes to be tested. Additional switches In a condenser of this type the anode (positive) be be- the so that any of the volt- large metal surface so as to get as leg of the core. Rice paper should placed may be placed in tester made of a very tween each layer of the winding and a layer of meters may be open circuited by opening their great a capacity as possible. As an electrolytic circuited by metal to empire cloth should be placed over the completed switch or any of the ammeters short condenser will arc violently from exposed The filament winding consists of closing their switch. This instrument will also surface of electrolyte, the anode is carefully covered primary winding. grid posi- below the sur- 10 turns of No. 12 D.C.C. wire and is wound over make tests of filament emission, current, with insulating material from just should be tapped at the voltages, and the effect of filament volt- to its terminal binding post. the primary. This winding tive grid face of the electrolyte center. Seven turns of the saute number wire are ages on filament currents. A layer of oil prevents evaporation. Remember wind- healed after a wound next to this and serve as the ionizing that the film di -electric can be cloth should be placed over the will form again. ing. A layer of empire REJUVENATING VACUUM TUBES puncture, as gas these windings. The filament and ionizing windings with tape. The two second- (605) N. O. Siegel, Nashville, Tenn., writes: should be held in place ary coils consist of 620 turns of No. 20 D.C.C. Q. 1. Will you kindly tell me what types of BATTERY ELECTROLYTE form, taped and vacuum be benefited by rejuvenation? wire and should be wound upon a tubes may (607) G. B. Daniels, Ilion, New York, asks: over the filament and ionizer windings. A. 1. Overheating the filaments of tubes whose then slipped Q. 1. Can you give me some information re- The completed transformer will measure 6"xVi" filament wire is of the thoriated type will cause the of solution its Edison cells? square as 'of surface layer of thorium. garding the renewal and will have two windows, each 2',4" rapid evaporation the 1. The potash electrolyte in Edison cells wind- 'fhe electron emission of the tube will then be only A. shown in the illustration. The two secondary has a normal specific gravity of 1.200 at 60 de- of 620 turns each should he connected in series. a fraction of its proper value and very little plate Throughout the irgs fresh thorium may grees F. at the normal level. All the high voltage secondary leads should be well current will be had. Usually total useful life of the cell, the electrolyte varnished cambric tubing or with be brought to the surface by heating the filament, renewal one or insulated with that the gradually weakens and may need rubber. This transformer can be used in an A, but during the heating it is necessary times depending upon the severity of the 400 milli- plate voltage be cut off from the tube. There is two beyond It and C eliminator employing the new service. The low limit specific gravity tenpere rectifier and will deliver 4 volts at S amperes additional thorium distributed through the metal it is inadvisable to run an electrolyte is and it is possible to form a which to the ionizer and 5.5 volts at one ampere for fila- of the filament often 1.16a Running a battery with electrolyte of also supply 360 volts at 300 new surface layer from this reserve supply, so 1.160 will produce ment operation. It will lower specific gravity than milliamperes and 375 volts tinder no load conditions that the tube will operate as well as when new. sluggishness, loss of capacity and rapid break- Restoration is of value after the tubes have been When ready to renew for the plates of the tubes. of time. If down on severe service. Either double cotton covered wire, or single in normal operation for long periods the solution, discharge the battery at normal rate used. Ex- the thorium content of the filament has been used for one or more hours. cotton covered enameled wire may be to zero and short circuit in the smaller sizes the use of plain enam- up almost entirely any improvement made by the Then pour out half the solution, shake the cell cept will be temporary only. if Do not rinse the eled wire in transformers is not advisable. restoration process vigorously and thee empty. be shellacked in place through accident high voltage has been applied to cells with water, use only the old solution. Im Enameled wire cannot only for an instant it is quite possible each cell pour in the which is a distinct disadvantage. The number the filaments ntediately after emptying of layers of wire is found by dividing the total that they may not have burnt out, yet the tubes new solution to the proper height. as detecting or amplifying some more elec- number of turns by the number of turns per remain dead so far It may be necessary to add this the depth of the winding may signals are concerned. Under such conditions re- trolyte after the cells have been standing, as layer. From It be re- the plates. be calculated, allowing for any insulation be- storation is entirely practical. must some may have been absorbed by layers. When the transformer is put membered, however, that this treatment can only For replenishing any solution in these cells tween the water. Do under load, the core and windings may become he used on tubes whose filaments contain thorium. during operation, use pure distilled is to trans- having plain tungsten of solution to drop below warm. \Ithough it possible design It cannot he applied to tubes not allow the level the formers to operate at low temperatures, a certain filaments nor to tubes having oxide coated filaments. the tops of the plates. It is important that the trans- are found in the older does not exceed the amount of heating is permissible, and Plain tungsten filaments height of the electrolyte formers that run warmer can be built somewhat 1 filament such high, the solution will tubes which use ampere of current proper level. If filed too more compact. The temperature 201 series. Oxide coated be forced out the charge. The cells should cheaper and as those in the 200 and during rise, however, should not be so great as to damage filaments are those which operate at very low tem- never be allowed to stand empty for any length heat. electrolyte has been the insulation. When the transformer is put peratures, at a dull red or dull orange These of time. When the new load the second- 11 and 12 types, the 112 in the battery it should be given an over- under a full the voltage across include such tubes as the put ary terminals will drop a small amount. and 216-A. Thoriated filaments are found in most charge at the normal rate. 924 Science and invention jar February, 1928 Scientific Humor TO BURN OR NOT TO BURN FOR AIRPLANE USE .. CHEMISTRY PROF: "What is the most FIRST PRIZE-$3.00 Boss : "Since McSchnitzel that liquid opened non-inflanmiable known?" EAR-EAR credit account here, he hasn't paid cash for STUDENTS "The stuff they put in cigarette a single thing." C : lighter.."-Jura Craig. CAN'T GET/ 717-1-1AN'ORDIN, R I r !, "Does- CLERK : "Yeh, I'd call him a super- _EDGEWISE n't your wife charger."-Nelson Bitterman. COULDN'T BE THE EDITOR in enjoy the ra- dio set you It is said that by means of television, a gave her for SHINE 'EM UP face may be heard. X -mas ?" ELECTRICIAN TO HELPER: "Hey there, We often wondered what caused those SNORT- why didn't you clean this commutator?" awful noises we have heard on the radio, ER: "That's HELPER: "Why I didn't think it needed but now we begin a it to have slight suspicion. i m p o s- with those brushes rubbing against it." -Jhr.id F. Kirby. sible old -Ray Simmons, Rep. No. 25,646. man. Its all listening, you know !" - Henry A. REPEAT Courtney. RUSHING TO FATE ''Suppos- INQUISITIVE PERSON: "Why is that man ing I were on BY in the airplane strike, and light- ACCEPTABLE-JUDGING sailing around ning should WHAT WE HEAR big blow "G -g -good m -m -morning M - over that the fuses at some OPTIMIST: shed?" 114 mister S -studio M -m -manager I -d -did building and I -D OFFICER OF you advert-t-tise f -for a g -g -good r -r -radio should be asked AVIATION (with a an-n-nouncer?"-William LC911 to do the refus- knowing smile) : ing, what should NAME IT "He's in a hurry I do ?" ANOTHER FOR to land." asked the RADIO BETTER HALF: "Oh new FANS Gerald, electrician. why don't you tune in some of those INQUISI- "Refuse," r e - LOWER HARMONICS that this article TIVE PERSON: plied the old timer.K. F. Richards. "Why is he in a mentions? I just love to hear good mouth - hurry organ music on the radio I"-William Lemkin. to land?" OFFICER OF AVIATION : "His moments arc SAWDUST numbered, for he has a date with the hangar."-Thaddeus E. Hedge. "\\-I,y do they speak of a man snoring as flLL jokes published here are paid 'Sil lv ing good'?" for at a rate of $1.00 each; $3.00 "Because he has both 'pitch' and 'timbre!'" is paid for the best joke submitted SHOULD BE -II'illianl Lemkin. each month. DESTROYED Jokes must have a scientific strain An Englishman, arriving home after an and should be original. extensive tour ill America, was asked about ONE GOOD TURN the road conditions there. He testifies as Write each joke on a separate sheet follows: PRo1IIBITIONIsT (sipping suspiciously) : "I of paper and add your name and ad- "Nearly wonder what caused this cider to turn?" dress to each. all the roads in Hamerica are balls' good, the Oi.n SOAK (maliciously) : "Perhaps there Unavailable material cannot be Lincoln 'ighway, Washing- was a worm in the apple."-D. HimTlelnran. returned. ton Boulevard and Jefferson 'ighway, and all the roads built by the great Hamericans are excellent. But some bloomin' French- TOO MUCH MOON -SHINE LIE(K)LY AS NOT man by the name of DeTour built a lot of HUB: "I've branch roads that are simply 'orrible, don- named my car the 'Hen.'" "An affidavit is a long paper full of lies cher know."-John 1)tII: "Is that so? Chevrolet any eggs?" to prove you're not lying." Lumyuk. -Clifton Ask. -Robert Zarbock. LOVER OF NATURE CATALOGUE -WOODEN OCTO- IDLE EYES PQ\ I MRS. A : ( "What CAT a M} USSY! DOCTOR (look- do you think of PuSSY!) ing at patient's our radio?" TEACHER OF SCIENCE: "Now, eye) : "I see in- MRS. B: "Won- dications of liver derful. Even your Johnny, you'll an- ailment and static is so much swer me this : N Bright's disease." more powerful What is an octo- and distinct than pus ?" PATIENT : "Try JOHNNY: again. ours."-Rev. Wm. "An doc. That's eight - sided cat." my glass eye!"- Stet le. -Miss Helen v.. Clifton Ask. Steacll-. SCIENTY SIMON, Scientist -' STARCH IS MAW IN THE r GQEFj.I LEAF OF THE PLtvJT : LE55OI4 8Y THG LkJ,T,nICr -SCIENCE or CAa60rt-`: `-'- I S -. T)IOK,DF_ t40 ai AnIO WATER. tn) THE 1 PRocESS OF STARCN-P1P . -ofr_SEtJtE OF SLWIL,trHT -- e PLPNT IS CALLEO SheK,,wLEAF OC T,Né IT TEE.. ALTNOUGH t = Cb14,0O5- + ,20 : , AND. ¡ (hloroSVNCHES'S SINPLE, IT CAr1rJDT E[TRENf.LV LABORtatNi LoacS (Ns THE 1/ $E OUPLICATED us) TN FINE! - - THATs AN COLO2ING- MATTER EASY ERP£RINENT !-- ' 1 l . TIEE. URF.E4 PLA'tS I ;: (cAL.LED-CNLOROPNYIl) vJATEtZ I/J A C3OTTLE LEAF PART ,rJ A6SDR0,J r /yvSrERItl.1s T - - CARBOiJ Dlon, D£ ffEoM r JERV NH,cH HELP THc LIGµT RAYS eASy BREATH -- GLASS T'l)0T- CERTAIA THE 12eACTiorJ FOR BLOWIaG -- pRlnkr ABoor E/ , TH E -pIkJLIGNY-- AS l(1- SFEN$ 4( , id.--, - J'. ÉvanooTRKfmoIFTATFTRE LOJLV Eq./2, " IIt ) Science and Invention for February, 1928 925

-. . Y yWJii// t/J/JX%/fyJ/.P.T.1J.fJJf.%.T.T9 / /TfJ./r.r , C ..w.y1. ..ry.i iS ..Si.iii ti1:14117155:1122.975"P'j `ia1r... iC.r:yi -7- ,i:ií.C: i w1: /Ér = t!Lti:i,, : % i' u i a1 . 4 _ `=í/ 4 r SY t .Á, Vtisi! C d. -'''''IT WHO . If a ; , yl::'_'e ¡itt { ',. . ¡ t ; ,._::: `` 't. y n S' 1 _ !iS f .k -a.4 w:"., _.\=1, . -- . . e t /Mr:.-s:t __- .._...,. 13--Jsrr.sr.i-rrrrrrr...isr.r. e,r:sv:ie.:ir.r..-r%írvr-41464.---":"1:244"-.''' __ : __ - -_ - 6 - , \-u - . JM.i

AERIAL PROPULSION PREPARING LIQUID FIGURE TOY MILK No. 1,649,072, issued to George Roy :No. 1,637,415, issued to Karl Hefel- McAllaster. A toy of this class mayr. This invention constitutes comprises a pair of supports, upon an apparatus for preparing liquid which is provided . a means for milk from milk powder. It com- gripping the surface over which the prises a mixing feeding bottle, upon toy travels. Two anchoring por- the side of which a measuring scale tions are connected by a spring has been marked. which causes the toy to advance along a suitable surface. A flexible connection causes the tail to move when the toy is advanced over a suitable surface.

.10. 1,637,3891 issued to Peter Peter- son. The Invention shown above provides for the construction of an airplane propeller and means for operating same. The propeller com- prises two separable plates, having a steam conduit to each blade. These conduits lead to the rear edges of the propeller blade and open into a large funnel discharge nozzle on the edge of the blade. No. 1,638,379, issued to Fredrick R. Vordermark. The device shown TOY ELECTRIC above is a fan which is adapted PAIL WAY to be used in conjunction with some moving object, such as a swing and the like. The fan is governed by the extent and rapid- ity of the movement of the swing. OPTICAL DISPLAY PRODUCING IMITATIOÑ DEVICE MARBLE No. 1,582,199 issued to Frank P. Walters. This device comprises a number of imitation human eyes and a source of light adjacent to each eye. The object is to show SHIELD FOR the various differences between normal and abnormal conditions of RADIOSCOPES the human eye. A means is pro- No. 1,638,683, issued to Mario De- vided for controlling the lights marchi. The device shown below and a brain is provided with each is a shield for the production of eye which shows the optic nerves radioscopes or radiographs. It and the termination thereof. comprises a circular frame with a series of blades of X-ray opaque material. No. 1,647,172, issued to Louis Caruso. The toy electric railway shown here has a power rail free from moving parts and an electrically operated thermostatic switch con- No. 1,623,967, issued to Joseph A. nected with the power rail circuit. Moross. This process for produc- Three fixed contacts are used, one ing imitation marble provides for connected to a current carrying the application of a second color bar, the other to an insulated sec- while the first color is still wet, tion of the power rail. The third and tilting the support in various fixed contact is adapted to connect directions to effect a flowing of with a semaphore for indicating colors. the position of the switch. MOORING DIRIGIBLE SIGNALING DEVICE SPRING -SHACKLING AIRCRAFT MECHANISM No. 1,600 954, issued to Russell S. .Tr7TrTrrZr-rcz-s-= c- Begg. 'the spring -shackle shown >CT below is an anti -rattling device and consists of two springs, one encircling the other. A further ELECTRIC TOY object .is to provide spring -shack- No. 1,637,479, issued to Harry C. ling between the spring and frame Evelyn. The toy shown here has of a motor vehicle. A dust shield a switch arranged on the axle comprising a pair of sheet metal which intermittently closes a cir- cap pieces has also been provided. cuit leading to the headlights. A The rear end of each spring is battery is carried within the body formed into a tubular section so of the car providing current for that it may be provided with a the lamps. suitable bushing.

No. ,634,964, issued to Joseph A. Steinmetz. The device shown above .11.9 provides a method of mooring a dirigible balloon. The free end of an anchoring cable is lifted above ground fogs by a captive balloon. The captive balloon also carries identifying signals. The dirigible No. 1,638,417, issued to Elmer A is clutched to the cable by the Sperry. The invention relates to devices carried by the aircraft. A a signaling means which can be winch draws the dirigible down- employed upon aircraft advantage- ward until the drag lines reach ously. The device sends out a sig- the ground and the ship can thus nal and also indicates the course be moved to its hanger. taken.

NOTICE TO READERS: The above illustrated and described devices the Patent Office at Washington, D. C., give only the addresses of the have recently been issued patent protection, but are not as yet, to our inventors at the time of application for a patent. Many months have knowledge, available on the market. \Ve regret to advise that it is im- elapsed since that time, and those records are necessarily inaccurate. possible to supply the names and addresses of inventors of the above de- Therefore, kindly do not request such information, as it is practically vices to any of our readers. The only records available, and they are at impossible to obtain up-to-date addresses. -EDITOR. 926 Science and Invention for February, 1928

;, áfr.>rr. - - - - V"ñrS ,-`4,1

, w _ilit\tiÍfl:wAeil1'llr 5:19: /'JLllJJirlllllllllllf'/ll"lJ..l. L'l-. ;Jrjj7- JrlllllYl.rJ:-

The "Oracle" is for the sole benefit of all scientific students. Questions 3. Sketches, diagrams, etc., must be on separate sheets. Questions will be answered here for the benefit of all, but only matter of sufficient in. addressed to this department cannot be answered by mail free of charge. terest will be published. Rules under which questions will be answered: 4. If a quick answer is desired by mail, a nominal charge of 50 cents is 1. Only three questions can be submitted to be answered. made for each question. If the questions entail considerable research work 2. Only one side of sheet to be written on; matter must be typewritten or intricate calculation a special rate will be charged. Correspondens will or else written in ink; no penciled matter considered. be informed as to the fee before such questions are answered.

STATOSCOPE sun at the same instant; and contains but three - plaster of Paris in hot sand. While drying, the (2230) J. C. Turner, Verdigre, Nebraska, asks: fourths as much red light. Some gas -filled day- potatoes should be subjected to great pressure. Q. 1. Will you kindly publish a diagram show- light lamps produce a light which exactly matches This may be done by means of weights. When ing the construction of an insulated bubble type the visible portion of daylight. However, they finished it can be carved like the genuine article. statoscope and describe something of its working do not as a rule generate the correct propor- principles? tions of infra -red and ultra -violet necessary to FORMS OF LEAF SPRINGS A. 1. You will find illustrated on this page a reproduce all the characteristics of sunlight. typical instrument of the type mentioned. It These lamps are generally used as a substitute (2236) A. E. Stoker, Union City, N. j., writes: consists of an air chamber which is connected to for daylight, in matching colors. Q. 1. Will you please illustrate the various the outside air by a curved glass tube, in which forms of leaf springs which are used in modern is placed a small, definite amount of liquid, usu- MOTOR DESIGN motor car construction? ally a colored oil, to seal the air chamber. A A. 1. On this page you will find illustrated scale indicates the relative position of the liquid. (2232) H. A. Brankstone, Pittsburgh, Pa., asks: several forms of the most common type of leaf When the air pressure changes, owing to a Q 1. Can you give ine the data for building springs used. The springs used for supporting change in altitude, the liquid moves up in the a one -eighth horse -power motor, similar in con- the frame of the car on the axles are almost glass tube forms a bubble and breaks in the trap struction to the one -sixteenth horse -power motor always made from long, flat leaves and are there - provided for the purpose. During this time the described in "How to Make It?" air chamber pressure equalizes with that of the A. I. We regret that we do not have any data external air. The observation of the number of on any other motors of this particular type, "breaks" gives a rough indication of the amount excepting the 1/16 H. P. size, the details for of change in altitude, and the observation of the which. appear in the article you mention. You The various forms rate at which the bubbles break gives an idea could, of course, do a little experimenting and of leaf springs of the rate of climb or descent. The pressure build a motor of larger size on the same principle which are used in changes for which the bubble breaks depend on as the 1/16 H. P. design given in "How to Make modern motor car the amount of liquid in the tube. A common It." For a H. P. motor you would need a construction a r e value of pressure change for which the bubble larger rotor and you could, for example, have shown in the il- breaks is .02 inches (.5 millimeter) of mercury, the rotor of the same diameter with the same lustration at the which corresponds to a change of altitude of 20 number of copper inductor bars, but make the right. All classes feet at sea level and 26 feet at 10,000 feet alti- length of the rotor twice the length of that given of springs are de- tude. 'The movements of the liquid before form- for the 1/16 H. P. design. You will have to noted by the part ing a bubble serve to indicate much smaller experiment with the stator coils, so that the of an ellipse pressure changes than .02 inch of mercury. This motor will draw the proper amount of current so as not which they form, instrument must always be kept in a vertical to overheat, and at the same time to thus, a spring position, both to prevent possible loss of liquid sufficiently magnetize the stator frame or core, made of two and in order to have the breaks occur at equal so that the rotor develops approximately H. P. parts, placed one pressure intervals. Temperature changes in the over the other, air chamber which are caused by the equalization COLD AIR INLET and hinged at the of its temperature with that of free air will cause (2233) T. ends so that the the instrument to indicate falsely a rise or fall. Shade, Dayton, Ohio, writes: whole is oval - False indications due to this cause are mini- Q. 1. We have a hot air furnace which has shape, is called a mized by insulation of the air chamber. seven pipes leading to as many rooms. The cold full elliptic spring, air intake comes from the outdoors and is a ten - and is shown at inch pipe. We wish to take the cold air from F drawing. the hall through a floor register. What size in the Since these C would you suggest to supply ample circulation? springs are made At present this plant is not satisfactory. from long, flat A. 1. The efficiency of a warm air furnace de- leaves, they are pends upon the completeness of the air circula- called leaf p tion. In revising your present furnace installa- springs. tion, we would suggest that you use at least a Air Contoiner 20 -inch pipe for the cold air duct. Its cross sea- tion area should be at least as much as the total .1.111111.1111 llllll 11,11111..111"111 lllllllllllll area of the other pipes leading to the rooms. Probably reason the that your present installa- fore called leaf springs. These springs arc di- Open to tion is not working well is that the 10 -inch cold vided into several air intake is inadequate. In locating the cold classes, according to the shape outside air air register it of the spring or the parts of it. All classes are put in the Ball of the house or in denoted by the part of an ellipse which they some place where it will draw air from a number form. A spring made of two placed of rooms rather than front a single one. In parts one many cases, it is over the other and hinged at the ends, so that Piaster desirable to have two cold air the whole is oval -shaped, is called a full elliptic Poris inlets to the furnace casing to improve the cir- spring and is shown at F in the drawing. The culation. If you install two, each one should center of one spring upon be about 16 inches in rests the axle-the body diameter. of the vehicle rests upon the center of the other spring. A SINGING WIRES spring in one piece like one-half of Trap Trap the full elliptic is called a half -elliptic or semi - (2234) M. Landrey, Brooklyn, New York, asks: elliptic, shown at II. The axle is under the Oil Bubble Q. 1. Can you give me some information a:: center of the spring and the body rests at both to the cause of singing telephone wires? I have ends. A spring formed of a semi -elliptic part. -- --_-_ ------a-_-t---- noticed sometimes when the wind is blowing with half of another semi -elliptic above it is called F _ hard the wires are silent and in calm weather a three_quarter elliptic spring, illustrated at T. i I` _ ----- r -t7------T L -- they sometimes emit a singing sound. The axle is mounted near the center of the half A. 1. Those who live in the vicinity of tele- elliptic lower part, the end of the upper quarter phone and telegraph poles are familiar with sing- elliptic is hinged to the rear end of the lower ing wires. Sometimes when the wind is blowing part, the front of the lower part fastens to the Air Container hard, the wires are silent, whereas in time -oi body and the other end of the upper quartet calm they are sonorous. Evidently the vibration fastens also to the same. If the upper part of of the wires is not due to atmosphereic agitation a three-quarter elliptic spring is longer than alone. Recently a Paris scientist investigated one -quarter of the oval, the spring is called a the cause of the singing of wires and concluded seven -eighth elliptic, shown by S in the diagram. that the vibration of the wires always presages Springs formed of half of a semi -elliptic are the approach of bad weather. When the sounds called quarter -elliptic springs, and are illustrated Insulation are deep, he said, the change of weather may be at C. They carry the axle at the thin end and looked for within two days; when they are mounted on the frame at the other end. A Above the bub- are shrill are shown details of the or sharp, that is, of high pitch, the storm will spring that is between a half and a quarter - ble type statoscope, which gives an indi- arrive within a few hours. It is difficult to elliptic in length is called a cantilever spring. cation to airplane pilots of the altitude determine the real cause of the singing. An It carries the axle at the small or thin end and and also the rate of climb. American scientist calls it seismic agitation pro- is fastened to the frame at two points .,ear the duced by barometric depression and transmitted other end. Front springs are usually semi - DAYLIGHT BULBS to the wires by the telephone and telegraph poles. elliptic, full or three-quarter elliptic. Rear springs are usually three-quarter elliptic, semi - (2231) Wm. D. Illericlt, Oakland, Calif., asks: IMITATION MEERSCHAUM elliptic, full elliptic, seven -eighth elliptic, can- Q. 1. Are there any bulbs on the market at tilever, or quarter elliptic, this being the order the present time which will produce a light (2235) J. D. Marti, Easton, Pa.. asks: in which they rank as to the number used. Coil directly comparable to daylight or sunlight? Q. 1. Will you describe briefly a simple meth- springs are sometimes used to assist the leaf A. 1. In producing artificial sunlight, it must od for making imitation meerschaum? springs. Auxiliary springs are springs mounted be remembered that all of the daylight is not the A. 1. Macerate common peeled potatoes for in such a way that a heavy load brings the same. Daylight coining through a north window thirty-six hours in water to which has been frame near enough to the axles, so that the contains about one and one-half times as much added 8 per cent sulphuric acid. Dry on blot- auxiliary springs touch the axle or frame and blue light as daylight coming directly from the ting paper, and for several days on plates of come into action. Science and Invention for February, 1928 927

Jerry's six-gun barked and the pothook rider sagged to the floor. a the La [a Jerry Balsam Story by Richard A. Martínsenj 1ERRY BALSAM, one-time famous out- the little cowtown, is told in hair-raising law, had laid aside his six-guns to live fashion in this splendid western story, the life of a peaceful rancher of Coyote and as only Richard Martinsen, the Country. But he strapped them on again author, can tell it. "Bonanza Backs the when he learned that a mining syndicate Law" appears in the February number was out to get him and get him quick ! of "Triple -X," the popular magazine of What happened afterward in Paradise, western fiction. Now on sale! You like .to read stories that thrill; stories that cause the pulse to quicken, the scalp to tingle. Let "Triple -X," a real man's magazine, bring these thrills to you. [ In This Issue The Kid Deputy Firebug's Trail Big Timber Bullies By Murray Leinster By Allan R. Bosworth By L. Paul Wild Horse Range Peters from Cactus Flats Red Guns of Thunder River By J. Allan Dunn By J. Lucas By II. Bedford -Jones These, with Several Others, in the Big FEBRUARY Along with your copy of "Triple -X," take the Feb- ruary issue of "Battle Stories," the new magazine of war tales, published by Fawcett Publications, Inc., Minneapolis, Minn. You'll enjoy every page of it.

TRIPLE -X M.tC tZ1NE. F. S. 1. t Fawcett Publications. Inc.. Minneapolis, Minn. Inclosed findl!l.00 (bill or stamps). for which send me "Triple-X' for the next 5 months. Or, inclosed find _^.«. for copy of the February issue. Qzine Name FAdve,n t urle Address MAGAZINE City State... 928 Science and Invention for February, 1928

MOTOR HINTS 1f_' (Couhnued from page 903) s . amperage than this is indicated, the owner HOLDING CORK GASKETS WHEN L. should look for trouble in the wires. INSTALLING COVERS .01 '"2,' The magnetic type of vibrating horn is much like a Ford spark coil. The contact Cork gaskets, such as are invariably used points should be occasionally filed off and under valve covers, crankcase cover, rear the diaphragm adjusted to compensate for axle, housing cover and transmission covers, the amount removed by filing. To file the will only hold without leakage when they contacts, the rear cover of the horn should do not have breaks in them. be removed, while to adjust the diaphragm, a screw driver is used ENGINE SILK THREAD HOLDING through the projec- GASKET. tor of the horn, turning a screw on the Q9 front of the diaphragm. The motor driven horn should be lubri- "7-" 11=7 cated each three months, and any surplus oil, especially around the commutator should be wiped off. The r 1 vibrator type of horn needs no oil, but this type should be kept ill clean and the connecting CO1'' wires should be tight on the terminals at all times, especi- ally the terminal post connecting to the wire from the horn button. CORK Learn Aviation by (GASKET. Building and Flying HIGH-PRESSURE AIR FOR CLEANING FUEL LINES The most serviceable and simple means for clearing fuel lines of muck and other Model Airplanes accumulations, is by means of a high-pres- sure CRANK CASE IRPL ANESare a fascinating, instruct- stream of air. It is usual in the shop LOWER COVER. ive and useful study, and Model to have a high-pressure line fitted with a building and flying shows you in the best small nozzle and a valve for turning the and easiest way how real machines are air on. constructed and how they fly. Ideal An ordinary hose connection for tire _ Models are wonderful: accurate copies of pumping, is not suitable for cleaning pipe SKET. SILK THREAD. Famous Airplanes with parts and fittings lines, as it is impractical to hold the valve How to make cork gaskets remain in place while just like real ones. They are all guaran- Dpen by the same means as is done while replacing crank case. teed to fly when correctly constructed. pumping tires. These gaskets Building then] is easy: Ideal Complete An ingenious expedient used by one motor- are flimsy and are fre- Construction Outfits contain everything ist, is the means shown in the quently dropped out of place when bolting attached the cover needed, including drawn -to -scale plans, sketch. In this scheme the stem from an or so misplaced that the bolt diagrams and instructions. These Outfits old valve is used, with a base spreader punches through a section of the gasket and and opens up leaky provide the most practical way to build a two nuts, forming a finger hold. The valve a place. is pointed, One of the best Model Airplane. Pick the Model you so to enter the end of a pipe means for installing a want from the list below and start building cork gasket, with assurance that it will be now. in place, is with the use of a silk thread to LINDBERGH'S "Spirit of St. Louis" HIGH PRESSURE AIR USED TO CLEAR tie it up and fix it in position. (shown above) 3 ft. size. Complete FUEL LINES. The sketch illustrates this method, show- Construction Outfit $ 7.50 ing FOKKER "North Pole" Monoplane the gasket ready for the cover. The silk (shown above), 3 ft. size, Complete thread can be run through bolt holes and Construction Outfit 8.50 also will remain on the gasket, without inter- DeHAVILLAND Air Mail 'Plane, 3 ft fering with size, Complete Construction Outfit 7.50 screwing in the bolts. If the JN4D-2 crankcase persists in leaking Curtiss Training 'Plane (shown FUEL LINE through the gas- above), 3 ft. size, Complete Construe - ket, put it on by this means and the leak will ton Outfit 7.00 NC -4 Naval Cross -Atlantic Seaplane, invariably be stopped. 4.11 ft. size, Complete Construction Outfit 10.00 NIEUPORT French Scout Monoplane, AIR HOSE The new call for help is "Mayday," to 3 ft size, Complete Construction be Outfit 6.00 spoken through the broadcasting appa- B L E R I OT or Monoplane, 3 ft. ratus. This would he followed immediately, size, Complete Construction Outfit, as in the case of an S O S, by details as each 5.00 GRIND OR FILE to TO POINT. the location of the origin the Ask Your Dealer, or Order Direct if Unobtainable. of call. West of Denver, Colo., or in Canada, add 50c. 'Mayday" is the phonetic spelling of the to each price above French words "M'Aider," meaning "help me." Plans for Model Airplanes OLD TIRE VALVE VALVE Ideal Plans (drawn -to -stale) and Building -Flying INSIDES BRITISH Instructions show how to build Model Airplanes. SPREADER AND TWO REMOVED. LOCOMOTIVE USES get and Lots of boys Plans Instructions in LOCK NUTS. TIRE OIL AND STEAM advance and build a little at a time with INFLATING HOSE materials on hand or ordered as needed. C NOZZLE. A locomotive which is said to establish a For these boys we supply Plans and In- record for a combination of revolutionary structions for any one of the 'Planes listed EACH above for Postpaid features in a single design has just been completed at Leeds and is known as the How to use high-pressure air to clear fuel lines. Kitson -Still internal combustion locomotive. New 64 -Page Book The engine combines internal combustion or other small opening. By means of this with the expansive force of steam. The on Model Aiplanes hose be the tire connection can opened and power unit, which is the result of ten years' Teaches the principles of flying; the air from this line used as frequently experimenting, consists of eight contains plans and directions for as desired. double -action building Gliders and Racers, and cylinders using both steam and oil vapor, the full information about scale steam entering the cylinder at one end and Models of real 'Planes; also the most complete catalog of "MAYDAY" SELECTED AS S O S atomized oil at the other, or on the down parts, materials and sup- stroke, so that it acts alternately as a steam plies for Model builders CALL and internal Sent postpaid for C combustion engine. A distress call for use in radio -telephony The oil is not only employed for internal and to be the exact equivalent of the uni- combustion, but IDEAL AEROPLANE & SUPPLY CO. is used in raising steam. versal S O S in radio telegraphy has been These are only two of several unusual Established 1911-17 years ago devised by the International Radio Confer- features. 165-169 Spring Street, New York City ence and has been incorporated in the new It is asserted that the fuel cost of the'new international wireless convention. engine will be half that of the ordinary type. Science raid Invention Jor tebrltary, 1928 929

krDealers,Commun4 Set8uilders,General Repairmen fw and iqeith! Be sure to get this great 128 -page book with net prices to the radio trade. Radio Specialty Company is radio's oldest radio parts mail order house in the country, and the new confidential prices on standard radio merchandise are the lowest of any radio house. We are ready now to appoint additional agents in all parts of the country. If you are contemplating making big money in radio merchandise, be sure to get in touch with us at once. WHEN WRITING TO US, USE YOUR LETTERHEAD

ENLARGED EDITION = w0.' 8 7"5 !-fOOKUPS I500 I LLU STRATI ONS

ffitY from *adios Oldest ?hail Orderifouse! radio instruments, We are the oldest established, exclusive radio mail order house in tl.e country. teous service. We carry a larger variety of radio parts, house in the country. All orders are positively shipped within twenty-four hours; quick, prompt, cour- accessories and radio findings than any other radio You will find in Catalog No. 18 the largest assortment of radio merchandise in this country. Radio Specialty carries more radio parts and radio material than any other house in the country. You will find in this catalog positively the largest variety of radio merchandise. VASCO''has tF If you are in need of certain small radio parts that other radio and mail order houses do not bother to carry. get the Rasco Catalog and you will find the small parts there, anything from a screw to copper ribbon, tele- phone diaphragms. as well ás thousands of other small radio findings. Just to mention a few: Lugs. nuts, jacks, plugs, all kinds of knobs,eords, panels, screws, sliders. svashérs, selenium, tinfoil, switches, crystals, cap nuts. Litz wire, cord tips, brass rods, resistances, binding posts, switch parts, carbon balls, switch points, lock washers, carbon grains, ground clamps, metal pointers, ANYTHING insulated tubing, low melting metal, antenna connectors. as well as thousands of other articles. We carry the Largest Variety of Small Radio Parts in IN RADIO the World, BUT We also carry All Standard Radio Merchandise.

1 O.

98 PARK PLACE NEW YORK 930 Science and Invention for February, 1928 Hints for the Mechanic

WATER -LINE MARKER HOME-MADE BEARINGS FIRST PRIZE -510.00 Bearings WOOD PATTERN for light POURING work VENT HOLE may be HOLES easily made as shown in the sketch at i the right. A PLASTE OF PARIS pattern is MOULD first made of ALL FUMNNEL wood and SIDE PLATE a mould poured from this pattern. 7 MOULD INI POSITION Vent holes 419( FOR POURING and a pour- 4l OIL HOLE ing hole are The above photograph shows how to use the SAW SLOT DRILL scribers for marking the water arranged. -line on a The bearings DRLC model boat. are cast In order to accurately Irons babbitt DRILL IL mark the water -line rPIPÉ T of a model boat, construct either one of the metal in one / two scribers shown. The scriber is placed solid piece. 51A.FT WEEKS AGO on one side of the hull. One scriber is made A hole is -u by clamping a pencil to a combination square, drilled in the FILLED WITH the other from a block of wood, a wedge, center for BABBITT he clipped and a pencil, as shown in the photo.-D. P. the shaft and PIPE IIII I I Watson. the bearing the coupon is divided ~FLANGE IMPROVED RULE with a hack Other fellows had left him in the so- saw. An oil cial background. Girls avoided him. He was -6: hole is drilled as shown and the top section missing all the modern fun. Then, one day, is bolted to the body part. Hangers may be ~11~~' Ll IIIrPpI "I he read an advertisement. It held out a made as shown from pipe fittings. The pipe promise of popularity if he would only T T, through which the shaft passes, is filled a { learn to play ` fIIII1III1I11 1I1I44I ;I with babbitt to form the bearing.-E. H. The details of the improved ruler are shown Fisel. above. A quick measuring rule may be made by eTrue crone cutting a number of steps in the ruler as A New Department Saxophone shown above. The rule may be used for He thought himself musically dumb. Still, measuring small distances, ECHANICS' needs have either along its caused us to start this new the ad said it was easy. He mailed a coupon, length or its width, and the size can be and later sent for a Saxophone for 6 days' quickly and accurately department-"Hints for the determined. A metal Vi Mechanic," in trial. Before the end of the week he was rule should be used, as it which we in- will not become tend to publish wrinkles useful to me- playing easy tunes. That was 6 weeks ago, broken or chipped.-Contributor send name and today he's "popularity" itself. Always and address. chanics in general. You can help us welcome everywhere. with this department by writing a brief description of your favorite You Can Teach Yourself LENGTHENING DRILLS shop wrinkle and sending this to the If you can whistle a tune, if you can beat time, you can learn to play the Buescher Saxophone, Easily! DRILL ROD editor of this department, together You can teach yourself, at home, In a fesv evenings. OR BRASS.' with a pencil or pen and ink sketch Three simple lessons given on request with each new of the wrinkle. The ideas published Saxophone start you. You learn scales in an hour and start playing tunes in a week. Your progress will HEAT E, herewith will give you some idea of astonish and delight you and surprise your friends. APPLY what we want. Our draughtsmen READY will make the necessary mechanical Try Before Buying. Easy Terms FLUXED Take home with you any Buescher instrument, SOLDER. drawings, so you need not send us Trombone, Cornet, Trumpet, Saxophone for six finished drawings. We will pay $10.00 days' trial. Test it. See what you can do with it. If you each month for the best like it, pay a little each month. Play as you Pay. Sat- Wrinkle isfaction guaranteed. Send for beautiful free catalog or Hint sent in; others published will of any instrument and details of trial and payment be paid for at space rates. Address plans. No obligation. Do this today. all letters to Editor, Hints for the BUESCHER BAND INSTRUMENT CO. Mechanic Department, in care of this Everything in Band and Orchestra Instruments magazine. 2155 Buescher Block Elkhart, Indiana 'The Story of the DRILL HOLDER r' SAXOPHONE A handy drill holder can be made from a i Gives complete history and DRILL piece of wood about 6 inches long. Brass 1 tells why the Buescher is so FOR plates are fastened on either side of the ee,. easy to learn to play. In it you SOCKET. -- A will find the first lesson chart. ROLE5 FOR DRILLS. BOOK _ - You must have this fine book. 1 SHORT OR BROKEN STUBS OF .11N. ~11. WO., the ,CoüpO NOW!! DRILLS ARE EXTENDED WITH THIS MEANS. r.BUESCHER BAND INSTRUMENT CO. sae 1 The method of lengthening drills for reaching 2253 Buescher Block. Elkhart, Indiana. into deep positions is shown above. : Without obligating me in any way please WOOD lGentlemen send me your free literature. 1 am interested in the in- I BRASS PLATES.. BLOCK1 etrument checked below. Saxophone° Cornet° Trumpet° Trombone° Tuba To lengthen a drill, proceed as follows: Above-The details of the drill holder. drill a hole into one end of a piece of drill { Mention any other Name rod or brass rod. Then, sweat the end of wooden block. Holes are now drilled Address the drill into the hole, by holding in a flame through one brass plate, through the wood, __J and touching with self -fluxing solder. Broken to the other brass piece. Do not drill drills may also be repaired by using the through the second brass plate.-C. F. above method.-G. A. Lifers. Felstead. 931 Science asid Invention for February, 1928

ELECTRIC STEAM ENGINE . ..r..="T

ft

1 The photograph above shows a new style of electric steam engine. It consists of a boiler and single -acting horizontal type engine, a whistle and steam shut-off valve. The mech- DRESSING GLASS anism is heated by a 300 -watt coil in juxta- See LePage's Book, page 21 position with and under the boiler, hidden by the base. -Illustration Courtesy Metal Ware Corporation. Now You Can Make WOOD ALCOHOL TEST Them Yourself CARD or CONSOLE TABLE See LePage's Book, page 17 20 Attractive Pieces of Furniture LePage's New Home Work Shop Book will show you how These diagrams indicate the simple test for wood alcohol. The one at the left shows a winter evenings, let this New simplified still, made of two bottles and a in the long perforated cork. The test is made on the NowLePage's Home Work Shop Book show you distillate in the manner indicated at the right. how to make 20 different pieces of gift furniture, designed by an expert-attractive, artistic, useful, practical and easy to make. New Book-Greatly Improved The first LePage's Home Work Shop Book, published a year ago, proved so popular that, though advertised only a few times, over 30,053 copies were sold-an enormous edition for a hook of this kind. Now the new book, of which 30,000 PIANO BENCH additional copies have already been sold, represents a wonderful See LePage's Book, page 9 improvement over the old one. Of its 20 complete projects 16 are entirely new and never offered before. Each project is presented in three parts-a photographic POISON PURE illustration of the finished project, a complete dimension If, after adding the reagents in order, the drawing of its parts, and simple, easy-to -follow directions, for distillate remains colorless 20 minutes later, making, given step by step from start to finish. any liquid from which the distillate has been obtained can be considered free of acetalde- Designed by Expert hyde, wood alcohol, formaldehyde, etc. -Must;ations Courtesy Detectol Mfg. Co. For each of the 20 gift projects, the design, dimension drawings and photographs, as well as the actual articles, were made ENGINE by William W. Klenke, Instructor in Woodworking. Central PUFFER Commercial and Manual Training High School, Newark, f New Jersey. Assurance is therefore given that each project and the directions for making it is perfectly practical. did In addition to the four pieces illustrated above, the book includes the following 16 projects: Occasional Table, Spanish Ship Model, Folding Sewing creen, Fernery Stand, Tilt Top Table, Piano Bench, Costumer. Priscilla Sewing Box, Table Desk, Desk Chair. Card or Console Table, Turned Bench, PRISCLL.A SEWING BOX End Table with Book Trough, Foot Stool, Book Stand and See LePage's Book, page 11 Back Rest. Where else could you get complete directions for making all these things for only 10 cents? In addition, this new LePage's book contains full information on how to secure plans for making fifteen more new projects, prepared by Frank I. Solar, Teacher of Manual "Training in Detroit Public Schools, and widely -known toot craft writer. Send 10 cents for this NEW LePage's Monte Work Shop Book JUST write your name and address on the coupon below, tear it out, and mail to us. today, with 10 cents in coin or stamps, and we will at once send eon a copy of LePage's New Home Work Shop Book, postage paid. Address LePage's Craft League. 571 Eases Ave., Glouces- ter, Mass. Tear out coupon now so you won't forget it. MAIL. THIS COUPON r- l.F.l'AnF.'S CRAFT Lencur, 571 Essex Avenue. Gloucester, Mass. Gentlemen: Enclosed please find 10 cents (coin or E stamps) in payment for LePage's New 1lome Work PAGE'S send a copy of this book to Shop Book. Please A very unique engine is indicated above. I GLUE Naive The accordion -pleated metal cylinder on top serves as the piston. This vibrates back and HANDIEST TOOL Street . . forth very rapidly. The cylinder is made of metal. IN YOUR WORKSHOP City .Stare -Photo Courtesy The Fulton Co. 932 Science and Invention for February, 1928 GLANDS MAKE GIANTS, NOT PRIZEFIGHTERS By FREDERIC DAMRAU, M.D. (Continued from page 899)

gland lying within must be extremely over- in this respect is short-lived and soon gives sized and overactive. place to muscular inferiority. There is no appeal from the mandate oí The history of our greatest fighters does the pituitary gland. When it commands the not show that they held the world's crown bones to grow, they must necessarily expand for a few years, only to become invalids their dimensions. according to the will of thereafter. It is true that, a few decades their diminutive but all-powerful master. back, some virtually drank themselves into But one important distinction depends on the grave; but most fighters, who have FRONTAL LOBE taken proper care of themselves, have en- joyed good health for many years. We may take Jack Dempsey as an ex- ample. The Dempsey who came within an ace of defeating Gene Tunney at Chicago TEMPORAL on September 22, 1927, was probably little LOBE PITUITARY short of the Dempsey who knocked Willard BOOM out in the third round at Toledo on July 4, 1919. Dempsey still shows an amazing "How I Licked punch, is still a likely candidate for the world's championship, and-I venture to Wretched state-will not occupy an invalid's chair Old UNDER for many years to come. SURFACE J. J. Corbett continued to give boxing Age at 63" exhibitions for many CEREBELLUM ¿ years after his retire- "1 Quit Getting up Nights-Banished ) OCCIPITAL. ment from the ring, and he displayed not LOBE Foot and Leg Pains ... Got Rid of only amazing skill, but also retained his Rheumatic Pains and Constipation MEDULLA strength and vitality. Certainly I can see Improved Embarrassing Health OBLONGATA no comparison between the sustained vitality Faults Found Renewed The above diagram shows the base of the of the ... Vitality. brain and indicates in particular the position boxer and the short-lived burst of of the pituitary body. It is this tiny gland strength shown by the pituitary giant. "At 61, I thought I was through. I blamed old age. whose over but it never occurred to me to actually fight -activity can cause freak or ab- I recall mistaking Carpentier for a tennis back. I was normal conditions in body. only half -living, getting up nights ... embarrassed in our player. He spoke to a friend of mine while 'ay own home ... constipated , .. constantly tormented we were aches 62 whether the watching Borotra play, and I was by end pains. At my condition became almost pituitary gland asserts itself not aware intolerable. I had about given up hope when a doctor before or after maturity. of his identity until I heard his . name. recommended your treatmen Then at 63, it seemed Until about the age of eighteen, the bones This incident brings out the point that I shook off 20 years almost overnight." that there is are still capable of lengthening; conse- nothing out of the way-phy- quently, one may grow sicians say abnormal-about pugilitsts when taller. After that they are Forty-The Danger Age time, more or less, the length of the bones dressed in their street clothes. They These are the facts, just as I learned them. In 65% of has been definitely fixed do not look at all like prize fighters, except all men, the vital prostate gland slows up soon after 40, and nothing can for the No pain is experienced, but as this increase the powerful development of their distressing condi- individual's height. shoulders. tion continues, sciatica, backache, severe bladder If the pituitary boss is restless and works weakness, constipation, etc., often develop. Pituitary cvertime in a person under eighteen, his giants, on the other hand, have bones will be striking features. Their faces are usually stimulated to grow beyond the of the Prostate Trouble normal length. The result will be an indi- acromegalic type, as has already been These are frequently the signs of prostate trouble. vidual of supernormal described. But, if we study the features of Now thousands suffer these handicaps needlessly! For stature; that is, a Gene a giant. Tunney or Jack Dempsey, we can prominent American Scientist after seven years of see none research, discovered a new, safe way to stimulate the On the other hand, if the tyrant within of these abnormal traits. They prostate gland to normal health and activity in many the skull does not become could just as well pass as movie heroes. cases. This new hygiene is worthy to be called a notable domineering until There achievement of the age. after the age are tests of thousands of men in of maturity, the long bones the overactive receive the command to enlarge at a time pituitary class, but apparently when their only two in the Tunney-Dempsey class. It A National Institution shafts are hardened and cannot takes more than therefore become longer; but they show the the pituitary gland to make for Men effects a Tunney or a Dempsey. It requires a Past 40 of stimulation in other ways. Bony perfect Its success has been startling, enlargements appear on various parts of physique, unusual muscular devel- its growth rapid. This new hy- the skeleton, especially opment and lightning reflexes to start with. giene is rapidly gaining in national on the sharp points. But, in addition, prominence. The whole face becomes the pugilistic champion must The institution in enlarged and coarse possess supreme courage, Steubenville has now reached in its bony contour. The lower jaw is pro- rapid judgment, large proportions. Scores and even t J arts and the perseverance to stick to training hundreds of letters tcoat-t truded, the front teeth are spaced, the eye- pour in every 'jilt,' in the face of all day, and in many cases brows jagged and temptations. reported it still overhanging, and the We recall results have been little short of cheek bones sharply conspicuous. At the that Jack, in the fable of Jack amazing. In case after case, men j olt' and the Bean Stalk, killed the giant by cut- have reported that they have felt same time, the hands and feet enlarge so rapidly ting the bean stalk and allowing him to fall. ten years younger in six days. that the individual must increase And Now physicians in every part of the size of his shoes and gloves the abnormal pituitary giant is very the country are using and recom- oa every few mach like the j, months. giant whom Jack slew; for, mending this treatment. in spite of his great size and Quick as is the response to this This condition is known as acromegaly. apparent newhygiene,it is actually a pleas- IC _^ It is the same matter of strength, he is weaker and less long-lived ant, natural relaxation, involving an over -ambitious than the normal man. pituitary gland, the only difference being The giant's bones no drugs, medicine, or electric rays whatever. The are overdeveloped at the his scientist explains this discovery and tells why many in the onset of the trouble later in life. expense of muscles. - men are old at forty in a new book now sent free, in Frequently the two conditions of giantism 24 -page, illustrated form. Send for it. Every mad oast forty should know the true meaning of those frank facts. and acromegaly go hand in hand. As a No cost or obligation is incurred. But act at once before mattet'of fact, most pituitary giants have this free edition is exhausted. Simply fill in your name distinctly below, tear off and mail. acromegalic features; that is, their lower jaws are prominent, their teeth spaced, The Electro Thermal Company and their features large and bony. 4502 Morris Ave. Steubenville, Ohio PITUITARY GLAND DOES NOT MAKE II you live west of the Rockies, mall your Inquiry to FISTIC CHAMPIONS The Electro Thermal Co. It has been suggested that the supermen 303 Van Nuys Building, Dept 45-B of the fistic ring owe their supremacy to THE OPTIC LOS ANGELES, CALIF. the fact that overactivity of the pituitary THALAMUS gland has placed a touch of the giant in THE OPTIC THE ELECTRO THERMAL CO., their make-up. With this view I cannot NERVE CEREBELLUM 4502 Morris Ave., Steubenville, Ohio agree in the least. THE PITUITARY In the first place, pituitary giants are BODY THE Name noted THIRD THE PINEAL for their weakness, not their strength. NERVE GLAND Address It is true that they may temporarily be cap- able of feats of great physical prowess. City State A vertical median section of the brain, show- But whatever superiority they may possess ing also the location of the pituitary body. 933 Science and Invention for February, 1928

The Flying Piano (Conlin:fed front page 8.93) Go After the Big -Pay Job!

G DON'T be satisfied to worry along in little jobs with little pay. Mas- ter the finer points of electrical practice and bring the big -pay job within your CABLE reach. The man who knows electricity - in all its many phases-the man who has mastered the subject from 15>e00thO PERCORMER e completely A to Z-can pick his own job and name -MOTOR WINCH his own salary. Learn the way to big- TO PROJECT pay. Become electrical expert. I SLIDING. BOOM. ger an trU Croft till show you how. Through his \\ famous books he will teach you elec- COUNTERWEIGHT tricity as experts know it and put you in \\\\ line for an expert's pay. Fiity-nine \ "A'nou' electricity as experts know it and thousand men are using these books to One method whereby get an expert's pay" sttp ahead-WHY NOT YOU? an actor can be j swung out over the heads of an audi- STAGE- ence. The truck can ,ÁUDtENCE of Practical Electricity moved back and sfs / Library be l it I Croft forth, as well as 8 volumes -3000 pages-2100 illustrations, flexible binding swinging the boom. No method of teaching electricity offers a quicker, surer way to success than the One method Croft books. one end of the boom as shown. electricity, takes you through girl and a balloon which Starting right in with the ABC's of modern Croft of supporting a He gives you the boiled -down records of every -day electrical on a New York stage, is also his books in easy steps. was used in plain words, figures and illustrations. Nothing is left to the explained here. In this case, the balloon and practice a slid- imagination-there is no guesswork. the girl were fastened to the end of Croft has been through the mill. His knowledge of electricity has been ing tubular steel boom. A motor winch was gained by actual shirt -sleeve contact with electrical problems. Ile knows just Be has poured out all his knowledge-all his used to telescope or extend the boom at will. what is needed to get ahead. booms were experience-in language that anyone can grasp. Yet the text is so scientifically Both the telescopic and sliding correct that thousands of the highest -paid electrical engineers are using the hooks supported by cables and could be moved in as a reference set. The whole The famous set is, beyond the shadow of a doubt, the last word in practical various directions, as shown. who wishes get anywhere in field a movable electrical education. No one to the electrical arrangement was placed upon can afford to be without it. truck with a counterweight situated at the rear end. Thousands of Facts at Your Finger Tips The Croft Library contains three thousand pages. with twenty-one hundred of the clearest illustrations ever put into book form. Each of the eight flexible pocket-size volumes is indexed so that everything you need to know is right at your finger tips. CABLE Croft tells you the things you need to know about motors, generators, armatures. commu- tators, transformers, circuits, switchboards, distribution systems-intallation, operation and repair of electrical machinery-wiring for light and power-wiring of finished buildings-under- writer's and municipal requirements-how to do a complete job, front estimating it to com- pletion-illumination in its every phase-the lat- est and most improved methods of lighting, etc.

The Standard in a.®wtn 1.Ie'..r t>:r PIMA ptTry SPOT LIGHT Practical Electrical ;TU 'TWO ' Lair kiln! Bra" IIt1 WiYYYlltttllMnllllnftluealtllmnl Training'ti

Everywhere the Croft : Library is acknowledged 5 6' ',PERFORMER as the standard - the leader-in practical elec- trical training. It is the t"a14 daily guide of 59,000 CtNTxti. t`« / EVE BOLT- highly paid electrical H4B5 PCnnit workers and engineers. TATIdF hrr / There is nothing like it. ".i % q0017-0RtuM It is the most complete, s 7 the best illustrated, the most carefully compiled, r the most easily under- % McGraw-Hill stood library in print to- Book Co., Inc., By using either a center-supported steel boom day. No matter how s 370 Seventh Ave., or a counter -weighted boom, a performer can much or how little you ér/ 7 New York, N. Y. safely and easily be swung out over the know of electricity you audience. will find the Croft Li- Gentlemen: Send me brary a sound, helpful Ñ r the CROFT I.IItltARY guide to greater acCom- .: p, OF PRACTICAL. Ei.EC- Flier Wins Altitude plishntent. 4 I TRICITY (shippingcharges U. S. Navy / prepaid), for 10 days' free ex- Money / amination. If satisfactory, 1 Record Free Examination-No will send $1.50 in ten days and has the plucky Down -10 Months to Pay! / $2.00 per month until 519.50 Lieutenant Carlton C. Champion, been paid. If not wanted, 1 will navy flier who refused to leave his "ship' after Se that you may test our state -sent,. them. (To insure prompt ship- it had developed engine trouble and burst into ire offer to send the complete libnry of /returnment, write plainly and fill in all lines.) flames. has been credited with having attained s volumes to you for 10 days' free ex- the greatest altitude ever reached by man in a amination. We take all the risk-pay all the charges. You assume no o,- heavier-than-air machine. 1 Name A communication received December 9th by the ligation of any kind-you pay not s- National Aeronautic Association front the Feder ing unless you decide to keep the ation keronautique Internationale, announced hooks, in which event you pay Home Address that the latter organization, the recognized arbiter $1.30 In ten days and then $2.00 !/ of aerial records, had accepted Champion's mark o month for nine months. as a record. Send the coupon now and see City and State The baroeraph, which Lieutenant Champion the books for yourself. It's a risked his life to preserve in the perilous descent, little thing to do but it may showed after calibration that his plane, a Wright prove to be the best move YOU/ , Employed by Apache, had reached an altitude of 38.474 feet on ever made In your Itfe. OF 25th from Anacostia naval air a flight last July I Occupation SI -2-23 station. 934 Science and Invention for February, 1928 PATENTS Patent TRADE-MARKS-DESIGNS FOREIGN PATENTS

...r..-.re: ,- dvic - MUNN & CO. a PATENT ATTORNEYS Edited by .3 Associated since 1846 with the Joseph H. Scientific American Kraus . SCIENTIFIC AMERICAN -- caer Y BUILDING In this Department we publish such matter as who are in is of interest to inventors and particularly to those 24 \Vest 40th doubt as to certain patent phases. Regular inquiries addressed to Street be answered by mail free of "Patent Advice" cannot charge. Such inquiries are published here for the benefit of all readers. New York City If the idea is thought to be of importance, we make it protect the inventor as a rule not to divulge all details, in order to SCIENTIFIC far as it is possible to do so. AMERICAN Should advice be desired by mail, a nominal charge BUILDING and descriptions of $1.00 is made for each question. Sketches, must be clear and explicit. Only one side of sheet should be written on. Washington, D. C. NOTE:-Before mailing your letter to this department, see to upon the letter and envelope as it that your name and address are well. Many letters are returned to us because either the name of TOWER BUILDING the inquirer or his address is incorrectly given. Chicago, Ill. DRUM -HEAD LOUD SPEAKER RADIO STATION INDICATOR (1067) James J. Woodside, HOBART BUILDING New York City, sub- (1070) Arnold Lesti, Los Angeles, Calif., asks mits a suggestion for a drum -head loud speaker San Francisco, Cal. whether we think it would be a good which consists of coupling a idea to telephone receiver patent a radio station indicator to a drum -head -like diaphragm. Ile requests our which, by means VAN NUYS BUILDING opinion of of lights, would indicate which broadcasting sta- the same. tions were on the air and were Los Angeles, Cal. A. 1. Many years the which off. He ago editors of RADIO claims that this can be made as an attachment NE\VS and SCIENCE AND IN\ ENTION Itlaga- for Books and Information on Patents and zines radio receivers at a cost not exceeding $5.00. tried various materials in the construction He further states that several Trade -Marks By Request of the diaphragm a manufacturers are of loud speaker. A banjo, a interested in his invention, and also one snare drum, a bass drum and party Associates in all Foreign various other who is going to help hint in the sales for a Countries articles were used, including the wooden shell 15% royalty. of a violin. While they all produced results, A. 1. We their results were certainly do. We think it is an far from satisfactory, because excellent idea to patent this suggestion and they did not cover the necessary range which a advise a patent search loud speaker should and further action, on be made to cover. Their condition that the apparatus will do what is natural periods of vibration are ..t.:d':;P" entirely too pro- claimed for it. An idea of this nature should ii',''.\ ti_,:.y +i: ol:.'i:e. nounced and these periods have a resultant effect meet with a very good market and if properly upon the ultimate sound or voice signal. We constructed and easily applied, there should be would most assuredly advise you to stay away no difficulty in disposing of hundreds of thou- from any attempts at patenting this suggestion. sands of these devices. Why go to the trouble of giving an organization 15% of ' PERPETUAL MOTION AGAINI the sales price should they sell your invention, if you (1068) K. Hood, already have six concerns on Stewart Pittsburgh, Pa., sub- hand that are ready to take an mits a suggestion for a motor active interest -generator set, the in your method? There ís no reason why you generator being connected with a storage battery should not cash in TO THE MAN and the motor being operated by the on that royalty, instead of WITH storage giving it to someone else. You can better arrange battery. Ile does not call it perpetual motion, terms yourself. Your AN IDEA saying that the of own attorney, (for a corn. efficiency the generator is be- paratively small sum) will draw up the neces- I offer a low that of the motor, but he wonders how much sary comprehensive, experi- power the contracts and you will be satisfied that enced, efficient service for his system might save. you have done business with the original par prompt, legal A. 1. \Ve do not see how a motor -generator ties, protection and the hooked without any intermediary and at the same development of his proposition. up as indicated by you could possibly time received full value for your save any power. is invention. Send sketch, or model and de- It quite obvious that as Of course, we still doubt the possibility of scription, for advice as power is being generated by the motor, more any invention doing this work, to cost, power must be consumed unless the inven- search through prior United States by the motor in turning tion itself is rather costly. We do not see how patents, etc. over the generator. Consequently, the constant a station, when it is off Preliminary advice losses in the air, can extinguish gladly furnished without charge. the transference of the current into a light on the dial and the 'instant that station My experience power and the power into current again will goes on the air, the dial will light up. and familiarity always be present. It is with various arts frequently You can gain nothing at all obvious that this will require a great number me enable in the arrangement proposed. of to accurately advise clients as miniature bulbs or miniature signals in the to probable patentability before form of semaphores or shutters and that these they go to any expense. signals will have to be operated or by Booklet PHONOGRAPH RECORD TURN -OVER actuated of valuable Information and form a radio set, properly amplified, and previously for properly disclosing your (1069) Fred Pearlman, request. Write Idea. free on Asheville, N. C., asks tuned to the respective transmitting stations. today. whether it is possible for him to secure a patent because he is RICHARD B. under the age of sixteen. He also OWEN, Patent Lawyer advises that he has a 164 Owen system which enables a AUTO Building . LOCK Washington, D. C. record to be played on both AND MIRROR 41V Park Row New sides before dis- York City carding'it and it can be used on the new repeat- (1071) F. D. Carpenter, Concord, N. H., sends ing types of phonographs. in two plans, one of which consists of an auto- A 1. Yes; any attorney will assist you in mobile lock, so arranged that it will prevent the obtaining a patent and rear wheels from turning in any except a back- you will find no difficulty ward direction, in securing one, even though you are under age. and the other is a mirror holder. Appertaining to your device for the turning Ile asks our opinion of both. A. 1. we of records before they are discarded, we would Frankly, do not think that the auto- suggest that mobile lock which you have designed is a very you have a patent search made to good demonstrate whether or not there proposition, nor do we believe that you are other can get any extensive sale for similar systems already covered by patents. If the same. While BLUE BOOK ON PATENTS memory does not you have seemingly gotten around most of the fail us, we have seen several fire department and Priority Record blank gratis. such methods in past issues of the Official Patent regulations which prevent an MONROE E. MILLER, PATENT Gazette which automobile from being locked so that it cannot LAWYER, may be different than the system be moved, you have not 411-6 Ouray Building, WASHINGTON D. C. outlined by you and perhaps even better than prevented the theft of ELECTRIC tL AND MECHANICAL EXPERT your method. We the 'auto. It is a very simple matter for a would advise that you have wrecking crew to back up against a search made, after having made the necessary the car, lift sketches. up the rear wheels and tow the machine away. This method is resorted to more frequently than one would at first suspect. Likewise if the car is placed in a garage in such a position that it is up against the rear wall, it becomes abso- lutely impossible to move the automobile, unless PROTECT someone can manage to cause the rear wheels to rotate, raising the lock to its top position, INVENTORS and then insert a plug here to hold it fixed,- away from the notches into which it is to engage. Send for our Guide Book, HOW TO GET A PATENT, and Evidence of Invention We believe that the mechanism entails too great Blank, sent Free on request. Tells our terms, a difficulty in applying the same and too much methods, etc. Send model or trouble in locking and unlocking. sketch and description of your invention Our opinion concerning the mirror is contrary for INSPECTION and INSTRUCTIONS to the one mentioned above. You have designed FREE. TERMS REASONABLE. BEST quite a unique mirror holder which, if placed Name on the market, should meet with quite good REFERENCES. success. A resilient mirror bolder which will always carry the mirror back again to the cor- Street rect position but which is rigid enough to pre- vent minor vibrations from affecting it, and con- RANDOLPH & CO. structed as cheaply as you have illustrated, is City 172, quite to be desired. Dept. WASHINGTON, D. C. We wish you the best of success in your venture. (Continued on page 936) Science and Invention for February, 1928 935

At the right is a view of my draft- ing and specification offices where a large staff of experienced experts are , in my constant employ.

All drawingsand spec. My Patent Law ifications are prepar- ed under my personal Offices supervision. Just Across Street From U.S. Pat. Office

Ín i " 4 I Protect Your Ideas Take the Fírst Step Today-Action Counts inventors F If you have a useful, practical, novel idea for any new article or for an Improvement on an old one, you should communicate with a competent Registered Patent Attorney AT ONCE. Every year thousands of applica- tions for patents are filed in the U. S. Patent Office. Frequently two or more applications are made for the same or substantially the same idea Witik-Ai-tile4, (even though the inventors may live in different sections of the country and be entirely unknown to one another). In such a case, the burden of proof rests upon the last application filed. Delays of even a few days in filing the application sometimes mean the loss of a patent. So lose no time. Get in touch with me at once by mailing the coupon below. Free Boobs Prompt, Careful, Efficient Service This large, experienced organization devotes its entire time and attention to patent and trademark cases . Our offices are directly across the street from the U. S. Patent Office. We understand the technicalities of patent law. We know the rules and requirements of the Patent Office. We can proceed in the quickest, safest and best ways in preparing an application for a patent covering your idea. Our success has been built on the strength of careful, efficient, satisfactory service to inventors and trade- mark owners located in every state in the Union. Strict Secrecy Preserved-Write Me ín Confidence All communications, sketches, drawings, etc., are held in strictest confi- dence in strong, steel, fireproof files, which are accessible only to author- ized members of my staff. Feel free to write me fully and frankly. Your case will have my personal attention. It is probable that I can help you. Highest references. But FIRST-clip the coupon and get my free book. Do THAT right now. No Charge for Information On How to Proceed Mail this Cou.on W The booklet shown here contains valuable information relating to patent procedure that every inventor. should have. And with it 1 will send you CLARENCE A. O'BRIEN my "Record of Invention" form, on which you can sketch your idea and Registered Patent Attorney establish its date before a .witness. Such evidence may later prove valu- 534 Security Savings Commercial Bank Bldg., able to you. Simply mail the coupon and I will send you the booklet, and Washington, the "Record of Invention" form, together with detailed information on how D. C. to proceed and the costs involved. Do this NOW. No need to lose a Please send me your free book, "How to minute's time. The coupon will bring you complete information entirely Obtain a Patent," and your "Record of without charge or obligation. Invention" form, without any cost or obliga- my part. Clarence A. O'Brien tion on Registered Patent Attorney Name Member of Bar of : Supreme Court of the United States; rlourt of Appeals, District of Columbia; Supreme Court, Address District of Columbia; United States Court of Claims. PRACTICE CONFINED EXCLUSIVELY TO PATENTS, TRADEMARKS AND COPYRIGHTS (Important-Print or Write name clearly) `^/ e 936 Science and Invention for February, 1928

L1000 NEEDED Patent Advice A Personal Service for INVENTIONS (Continued from page 934) INVENTORS I maintain an unexcelled organization is a remark- LATEST PATENTS? and thoroughly equipped laboratories, to HEREable book for in- render the following services. ventors. Nothing' like (1072) William Michel, Oak Park, I11., has sub- it ever published be- mitted to us a copy of a patent on a sewer and I PREPARE APPLICATIONS for fore. Saves time. Saves well casing and he asks whether it is worthy of patents for filing in the United States work. Saves money. listing amongst our Latest Patents. and foreign countries. Tells you what inven- A. 1. Unfortunately, our Latest Patents are I PLACE INVENTIONS with re- tions are needed now, invariably very late issues and a patent two sponsible manufacturers, with whom I and what is offered for years old cannot find a place on these pages. am acquainted, under arrangements that them. Lists and de- The editors of this publication look through the are made profitable to the inventor...... tee._..._. scribes the ONE Patent Gazettes each week and order those I SPECIALIZE in Electrical, Me. THOUSAND NEEDED patents which they think are different and which chanical, Chemical, and Radio Devices. L - in these appeal to many of the readers in ` ` r INVENTIONS interested I INVÍTE CORRESPONDENCE fields: General Problems; Automotive; Mechan- SCIENCE AND INVENTION Magazine. Whi'e with ical; Electrical; Chemical; Radio; Aviation; we do not doubt but that the idea presents some reputable inventors, Scientists, Marine. Extra chapter on the TEN MOST valuable features, it is quite evident that the Chemists and Physicists, regarding their NEEDED INVENTIONS. construction has not met with a very great inventions and uncompleted experiments. appeal by casing builders. Had the inventor FOR. requested our opinion before proceeding with H. R. VAN DEVENTER IDEAS the patent on the suggestion, we would have Licensed Professional Engineer FORTUNES cautioned him. Registered Patent Attorney This wonderful book may give you one idea that will win you a fortune. If you want to in- 342 Madison Avenue, New York City vent-KNOW WHAT INVENTIONS WILL PAY YOU MOST. This book tells you. Compiled at NEON LAMPS AND TOY great expense, and edited by Raymond Francis Yates, formerly Managing Editor of a leading (1073) Henry C. Rolphe, Portland, Ore asks NEW YEAR - NEW IDEA scientific magazine. Over 100 pages durably bound. whether a patent can be obtained for different uses of the Neon tube, such as for traffic signals, PATENT YOUR IDEAS Send only $1.00 (nothing railroad semaphores, etc. He also would like to Call or send me more to pay) and your a sketch of Only know whether we think there is a possible chance your invention. Phone 3088' $1.00 copy of "10 Needed In- of placing the toy on the market in the form of a LONgacre ventions" will be sent immediately.mmediately. Outside roller -coaster. Recording Blank S. FREEInventorsContldential II. $1.25. Money back after 10 days' examina- A. 1. The use of an article for a different pur- Advlte . LUS. and tion, if desired. Write NOW for your copy. pose than that for which it is designed is not a Foreign Patents secured by claim for a patent. Thus, it makes no difference Reg' Patent ttemey BUREAU OF INVENTIVE SCIENCE what you use an electric light for, it still main- H.POLACHEK DEPT. 72 ROCHESTER, N. Y. tains its original basic patent rights. The same 1234 Broadway, New York is true of the Neon lamp and whether the Neon lamp is used for signaling purposes, for signs, for flashlights, for airplane beacons or light- houses, the basic patents cover each and every one of the various usages. NTIONSW We are of the opinion that many years ago a toy roller -coaster was put on the market, but we ommerciallzed have not seen a sample of this for quite some ON A CASH 0R ROYALTY BASIS tixte. \Ve would suggest that you have a search PATENTED or UNPA7ENTED made on the idea, but only if you are in a posi- in Busw vss 25 rears Comf.JefeP.c''/res-Refenxes tion to market the product. Many toys have been h rtteADAM invented that can fnd no available markets. _FISHER MFG. C O.. 205D Enright Ave. St. Louis, Mo.

who derive larg- AUTOMOBILE TURN SIGNAL est profits know and heed certain (1074) John Zeleznik, Bridgeport, Ohio, asks our INVENTORS simple but opinion on a direction signal for automobiles facts before applying vital for patents. Our book, Patent - which operates by means of a switch placed on Sense, gives these facts; sent free. Write the steering wheel and has a "right" and "left" Washington Monument In the Nation's Capital marker. A. 1. There are so many hundreds of automo- LACEY & LACEY bile turn signals of various styles, forms, shapes, 644 F STREET etc., on the market that we certainly would not WASHINGTON, D. C. PATENTS suggest that you apply for a patent on a similar Established 1869 DON'T LOSE YOUR idea. RIGHTS It is doubtful that you could even cover the TO PATENT PROTECTION suggestion you have made with patent claims of Can any value. We would You Sell Gas At 5c Per Gal not advise further pro- If so, Before disclosing your invention to cedure. write me quick, Sly Distributors make as high as anyone send for blank form "EVIDENCE $3,000.00 per month with amazing new thermostatic car- OF CONCEPTION" to be signed and wit- buretor device. Let ins show you how. nessed. As registered patent attorneys we SEND FOR FREE represent hundreds of inventors all over TRIAL Proof of astounding success and my $15.00 the United States and Canada in the ad- GOLF GAME to Distributors. a day Guarantee vancement of inventions. The form "Evidence of sample. (1075) Carl Herrmann, Cleveland, FRANK ANDREWS, President Conception," in- Ohio, asks our BLANCKE AUTO DEVICES CO. structions to of opinion of a toy golf game in which 154 E. Erie relating obtaining patents the different Street Dept. 863.8 Chicago, 111. and schedule of fees sent upon request. clubs are represented by small heads fitted with levers so that a ball could be pushed by means of these levers; thus, there is a driver, a mashie, -LIVE_SALESMAN WANTED LANCASTER & ALLWINE etc., each with its own characteristic slope. The 255 Ouray Building table itself is then fitted with trips, holes and WASHINGTON, D. C. different hazards, and the game is to be played the same way as a regular golf game, except of that Originators forms "Evidence the ball is pushed forward by action of the thumb - dl 4M of Conception." or finger on the lever. A. 1. There is on the market today a very in- a teresting indoor golf game which consists of a Bell Cox Holdfast Screw Drivers Self -holding. Self -re- large putting which is leasing. For Mechanics, Radio and Auto work. Proposition green fitted with the vari- and sample, 50c. ous hazards and made in the form of a cardboard tttachment for Yankee, 50e; Radio. 75c. sheet approximately 3 feet by 4Va feet. In ad- S. I. COX, Dept. 1, Franklin, Pa. dition to this, there are various markers directly PATENTS on the field and the game is played with minia- BOOKLET FREE HIGHEST REFERENCES WE PROMPTNESS ASSURED BEST RESULTS ture clubs and balls. In this way there is a cer- COMMERCIALIZE INVENTIONS tain skill required. In your particular Communicate with Send drawing or model for examination device us if you have a patent to sell or and advice. there is no more skill required than there would wish to buy one. be in shooting marbles and even less so, because AMERICAN FINANCE & DEVELOPMENT Ouray opposite CORP. WATSON E. COLEMAN, Patent Lawyer there is an automatic device which is intended to Bldg., PatentOffiee, Washington, D.C. 724 9th Street, N. W., Washington, D. C. propel the marble and which will always propel it straight in the direction of the aim, with per- haps a variation only in the way a marble will MACHINE SHOP roll after it hits a bunker or the distance over EDGAR M. KITCHIN FOR GENERAL AND EXPERIMENTAL WORK which Expert Mechanician In Electrical and Machine Work of all it will travel, depending on the force of Attorney and Counsellor at Law Rinds, Models, Light Manufacturing. Established since the stroke. The clubs, in our opinion, are of no Patent and Trade Mark Specialist 1878. Paul Hoenack 108 Park Row, near Chambers St.. particular value because the marble will always 805 G. Street, N. W. Washington, D. C. New York City. Telephone, Worth 0910. roll forward and the shape of the clubs will have little effect, nor is there sufficient skill necessi- tated in handling the devices. Protect yourrnventlons and While we are of the opinion that a golf game Your Own PATEN T S Trade -Marks today. Write can find a market, it should be one which pre- Cards, Stationery, Circulars. for lliustratrd patent book Per., etc. Save money. Print rev and sketch sheet and terms free. BRYANTB, LOWRY, sents many of the features of golf and which re- other.. bit Profit. Complete Out. 314 Victor Building, Washington, D. C. quires a certain amount of skill in its manipu- hie $8.86 up. Job p el l op. Rotary t1.9. Ear. ,Dien sent. Write for eatalut Eto-ria,oe not lation. type. paper, card. etc. The Kelsey Co.. C-47, Meriden, Conn Science and Invention for February, 1928 937

The Metal Emperor TREMADARKS By A. MERRITT AND (Continued from page 895) ENTS COPYRIGHTS stuffs, and covered them both with a fold long THE OFFER:OTECTION of blanket, then looked at each other OFRYOURPRINVENTION and silently-and I wondered whether my OUR lace was as grim and drawn as his. YOUR FIRST STEP. The inventor should "It appears," he said at last, curtly, "that write for our blank form-"RECORD OF IN- ft's up to you and me. for a powwow quick. VENTION." This should be signed, witnessed, I hope you're not sleepy." and returned to us, together with model or "I am not," I answered as curtly, the edge and description of the invention for of nerves in his manner of questioning do- sketch ing nothing to soothe my own, "and even if INSPECTION and ADVICE FREE! I were I would hardly expect to put all the burden of the present problem upon you by going to sleep." Our FIVE Books Mailed Free to "Don't be a prima donna," he flared. "I Inventors meant no offense." "I'm sorry, Drake," I said. "We're both Our Illustrated Guide Book a little-jumpy." "It wouldn't be so bad," he answered, "if all four of us were all right. But Vent- HOW TO OBTAIN A PATENT nor's down and out, and God alone knows Contains full instructions regarding U. S. Pat- for how long. And Ruth-has all the trouble ents, Our Methods, Terms, and 100 Mechanical Movements illustrated and described. $21,000.00 OUR TRADE -MARK BOOK for Spirits Shows value and necessity of Trade -Mark Pro- Dunninger, who writes exclusively for tection. Information regarding Trade -Marks and SCIENCE AND INVENTION Magazine and who is the Chairman of our PSYCHI- unfair competition in trade; CAL INVESTIGATION Committee, will personally pay $10,000.00 to any medium or spiritualist who can present any psychical manifestation in so-called spiritualism, OUR FOREIGN BOOK that he will not explain or that he cannot reproduce by natural means. We have Direct Agencies in Foreign Countries More than two years ago SCIENCE AND and secure Foreign Patents in shortest time and INVENTION Magazine offered a prize of $1,000.00 to anyone who could demonstrate at lowest cost. his or her ability to communicate with the spirits or to give some definite form of a psychical demonstration which in itself was not trickery. PROGRESS OF INVENTION The result has been that mediums and of World's Most Pressing Prob- spiritual organizations have been afraid to Description place proofs before us. Those weak at- lems by Leading Scientists and Inventors tempts which have been made tb demon- strate psychical phenomena were almost All Communications and Data Strictly instantly proven fraudulent, and no medi- um has dared to contradict our findings. Confidential. Interference and Infringe- In view of these facts, should we not ment Suits Prosecuted. consider all mediums fraudulent? To the $10,000.00 which has been offered by Joseph F. Rinn through this publication for Spiritual proofs and the. $1,000.00 in addition offered by SCIENCE AND IN- IMPORTANT VENTION Magazine we now add Dun- CASE SPECIAL. YOU SHOULD ninger's $10,000.00. TO AVOID DELAY MAKE YOUR So now we have a total of $21,000.00 of- HAVE YOUR CASE MADE SPECIAL IN OUR OFFICE to save fered for proofs of Psychical Manifesta- tions. Spiritualists-get busy. correspondence, secure protection and early filing date in the Patent Office. To secure special preparation of your case send $25.00 on account with model or sketch and description of your we have and some special ones of her own. invention. an idea that I've an idea"-he hesitated-" Our Lawyers Practice in all U. S. Courts and defend Clients in Suits involving there was no exaggeration in that story of Patents, Trade -Marks and Copyrights -what would you call it-possession that she told. An idea that, if anything, she OUR ORGANIZATION OFFERS PERSONAL SERVICE underplayed it." Lawyers, Solicitors, and Draftsmen "I, too," I replied somberly. "And to By Experienced Patent me it is the most hideous .phase of this We regard a satisfied client as our best advertisement, and whole situation-and for reasons not all furnish, upon request, lists of clients in any state for whom connected with Ruth," I added. we have secured patents. "Hideous," he repeated. "Unthinkable- yet all this is unthinkable. And still-it is. Highest References-Prompt Service-Reasonable Terms And Ventnor-coming back-that way. Like a. a. aai ~WRITE TODAYm a lost soul finding voice. Was it raving, Thornton ?" FREE ; VICTOR J. E VAN S & C O . "Ask yourself that question ?" I replied. COUPON Registered Patent Attorneys "Man-you know it was truth. Had not an inkling of it come to you even before MAIN OFFICES: 715 Ninth St., Washington, D. C. he spoke? It had to me. His message was little more than an interpretation, a syn- BRANCH OFFICES: 1007 Woolworth Bldg., New York City; 518-519 Liberty thesis of observations I, for one, lacked the Bldg., Philadelphia, Pa.; 514 Empire Bldg., Pittsburgh, Pa.; 1114 Tacoma Bldg., courage to admit." Chicago, Ill.; 1010 Hobart Bldg., San Francisco, Calif. "I, too," he nodded. "But why did he Gentlemen: Please send me FREE OF CHARGE your books as described above. .command us to go back to the city? How could he know-how could he? And what Name did he mean about Norhala being their weak spot?" Address He moved away from me, and strode over : a-ab 938 Science and Invention for February, 1928

i ;T f.,-, to the curtained oval through which Nor - hala had gone. IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIl111111II111! "Drake I" I cried, following him, "where are you 1L:1 .. going? What are you going to do?" "I'm going after that she devil," he an- j , 11 { " swered, pausing. "I'm going to have a show- 1 ^ `k 1 , down with her, or know the reason why." World's Latest 1 1 . N r "Drake," I cried again, aghast, "don't - P` , It make the mistake Ventnor did. That's not the way to win through. Don't-I beg you, Development! don't." "You're wrong," he answered stubbornly. "I'm going to get her. She's got to talk." He thrust out a hand to the curtains. Before he could touch them they were parted. r.`vvbilain Out slithered the black eunuch. He stood motionless, regarding us, the ink -black eyes "The Boss Didn't Even menacing. I pushed myself between him and Drake. Build your own Know My Name" "Where is your mistress, Yuruk ?" I "He sail' my face was more or less asked. Be a pioneer familiar and he remembered seeing me "The goddess has gone," he replied, sul- around, but he didn't even know my lenly. name until the I. C. S. wrote him that George Jackson had enrolled for a "Gone?" I said suspiciously, for certainly course of home study and was doing Norhala had not passed us. "Where?" fine work. "Who shall question the goddess?" he 'Who's George Jackson?' he asked. Then he looked me up. Told me he whined. "She comes and she goes as she was glad to see I was ambitious. Said pleases." he'd keep bis eye on one. I translated for Drake. ' ' "He did too. Gave me my chance "He's 5 when Frank Jordan was sent out on the got to show me," he said. ''Don't road. I was promoted over older men think I'm going to spill the beans, Dr. who hcd beer with the firm for years. Thornton. But I'm going to talk to her." "My spare -time studying helped me "Yuruk," said, to get that job and to keep it after I I "we think you lie. We -.J. got it. It certainly was a lucky day for would speak to your mistress. Take us me when I signed that I. C. S. coupon." to her."

Row much longer are you going to wait before you take the step that will bring you advancement and more money? It takes only a moment to mark and mail th\s Station coupon and send it to the International Correspon- dence Schools at Scranton. Isn't it better to do this today than to wait a year or five years and then wish you had? WRNY Mail the Coupon for Free Booklet NEW YORK 326 Meters - 920 Kilocycles INTERNATIONAL CORRESPONDENCE SCHOOLS "The Universal University" is owned and operated by the Box 6218-E. Scranton, Penna. Without cost or obligation. please send me a copy of publishers of this magazine your booklet, "Who Wins and Why," and full particulars about the subject before which 1 have marked X: Our Editors will talk to yott' fl Industrial Management Business Correspondence BE one of the first to own Personnel Management O Show Card and Sign several times every week - a set; Ei Trams Management Iettering See it will enable you to take part in in Business Law DIStenography and Typing your trews aper the series of []Accounting and C.P.A. °CD11 Service interesting experiments Coaching Railway Mall Clerk ,for details which scientific men are conducting Cost Accounting Common School Subjects TUNE IN ON -4' every Bookkeeping French High School Subjects week. Secretarial Work Magazine and Book WRNY Spanish Salesmanship Illustrator TELEVISION Advertising - The world will Cartooning soon be using TECHNICAL AND INDUSTRIAL COURSES this latest develop- Electrical Engineer Architect ment of the 20th Century as an Electric Lighting Architects' Blueprints important means of Mechanical Engineer - Contractor and Builder communication 1 Mechanical Draftsman Architectural Draftsman and conveyance of photos of world Machine Shop Practice Concrete Builder events Railroad Positions Structural Engineer to all parts of the globe. Gas Engine Operating Chemistry O Pharmacy Though yet Civil Engineer "I havé told you that the goddess is um in its infancy, this UP Automobile Work book, Surveying and Mapping Airplane Engines here," he said. If you do not believe, it is thoroughly explaining TELE- Metallurgy Mining BAgriculture and Poultry VISION, will give you Steam Engineering Radio Mathematics nothing to me. I cannot take you to her. a sound for I"do not know where she is. Is it you - fundamental knowledge of the sub- Name wish that I take you through her house?" ject and enable you to build a fine workable set Street Address "It is," I said. of your own. "The goddess has commanded me to serve Perhaps during your experiments City State you in all things," he bowed, sardonically. you will discover a startling improve- Occupation "Fol low." ment or a revolutionary method. If you reside in Canada, send this coupon to the Our search was short. We stepped This will certainly mean unlimited tional Interna- out Correspondence Schools Canadian, Limited, Montreal into what, for want of better words, I can wealth to you! describe only as a central hall. It was Before it becomes world-wide, ;LÉARN A TRADE- circular, and strewn with thick piled small get this book! 116 pages, 9 x 12 Re rugs whose hues liad been softened by the inches, fully illustrated. Independent alchemy of time into exquisite, shadowy Easy to learn watch and echoes clock repairing, engraving, of color, while the cuneiform shape and jewelry work by our of their woven inscriptions confirmed their F ! Ill "' practical system of individ- ancientness. The walls of this hall were On All Newsstands w'_ _ schoualtlaLi rninafewmningg. 50c -----,z- a school in a few if the same moonstone substance that en- \r Learn months This coupon will receive our / to All job paying up to 6100 a aosed the chamber upon iz- whose inner thresh- week or start your own business. immediate at enlion Big shortage of trained watchmakers. Ye help you earn old we were. They whirled straight up to money while von learn. Write at once for FREE ROOK the dome in a NATIONAL SCHOOL OF WATCHMAKING crystalline, cylindrical core. EXPERIMENTER PUB. CO., 1340 South Michigan Avenue Dept.29 Chicago, ill. Four doorways like that in which we stood 230 Fifth Ave., New York, N. Y. pierced them. Through each of their cur- Gentlemen: I enclose SOe. for one TELEVISION. copy of LEARN TO DRAW! tainings in turn we peered. ltemarkabio book.. COMMERCIAL All were precisely similar in shape ART AND CARTOONING." Ex- and NAME e vl:Saabow to make illaatrationa for proportions, radiating in a curved base tri- to bkecomeeo 'Caetsosint. NOaCOR angle from the middle chamber ; the RESPONDENCE COURSE -- Hook curva- ADDRESS all--I4 Munn. ture of the enclosing globe forming back tions table Eleomentaz ea S(Jri te Pen, Ink, Charcoal wall and roof ; the translucent the Soli [ ra7on slicings CITY STATE ate. Honed Finnbis. ley her - Pont paáii r. sides; the circle of floor of the inner .O.D. tteextr LVIE PUB. CO., hall 57 Rose Street. New York.York, Dept. 13h the truncating lunette. The first of these chambers held a half- 11111I111111111111111111NI1111I111I1111I1I1IIlIIIIIIIIIIIIIIIIIIIIIIIlI1IIIIlIIlI1I Science and Invention for February, 1928 939 t t t t t t t t t t t t t t t t(~, dozen suits of the lacquered armor and as t-t_1~11"1.t_t_t_t_<

"He tried to hypnotize us," I answered. INSTITUTEName "And pretty nearly did it." di K'JOdhV GdL Od@T Age Occupation what it "So that's was!" He was wide r1/l LIONEL STRONGFORT. DIRECTOR. awake. "I watched those hands of his, and I 'PHYSICAL AND HEALTH SPECIALIST Street got sleepier and sleepier-I guess we'd better OEPT.'432 - NEWARK. NEW JERSEY. U.S.A: i Clty State 1 1 I I ) 1 1 tie Mr. Yuruk up." 1 1) 1 1)) 1 940 Science and Invention for February, 1928

"No," I said, "No. He's safe enough as long as we're on the alert. I don't want to use any force on him, yet. Wait until A we know we can get something worth while by doing it." "All right," he nodded grimly. "But when that time comes I'm telling you straight. Cry That Has Professor, I'm going the limit. From splin- ters under his nails and gunpowder under his skin. There's something about that human spider that makes me itch to squash' him- slowly." Echoed "I'll have no compunction, Drake-when it's worth while," I answered. We sank down again against the saddle- bags ; he brought out a black pipe, looked Through the Ages at it sorrowfully; at me wistfully. "All mine was on the pony that bolted," I answered his appeal. The cry of the leper outcast, unclean! A soul -wracking, melan- "All mine was on my beast, too," he sighed. "And I lost my pouch in that spurt choly cry that has resounded in the halls of time since Egypt was from the ruins." young and the pyramids were but a dream. He sighed again and clamped down upon the stem. "If Thou wilt Thou canst make us clean," pleaded the lepers when "Of course," he said at last, "if \'eutnor the Man of Galilee walked among them nearly a,000 years ago. was right in that-that disembodied analy- And in His great compassion He laid His hands upon them and sis of his, it's rather-well, terrify ing, isn't gave them comfort. it ?" "It's all of that," I replied, "and con- But even in this advanced age the agonized cry of the leper is siderably more." raised, unheard, lost on the winds of the sea and stifled by the loneliness of far-off islands where millions of lepers this very hour are living a walking, breathing death. Actually, millions there are- IMPORTANT men, ;women and helpless little children who never should feel TO NEWSSTAND READERS the hand of leprosy. Thousands of these are under the American order to eliminate all waste and un- flag in the world's greatest leper colony at Culion in the Philippines. INsold copies it has become necessary to supply newsstand dealers only with the And yet, these exiled and forgotten millions are suffering and dying actual number of copies for which they have orders. This makes it advisable to needlessly. It is astounding but true that leprosy is curable. In place an order with your newsdealer, ask- five years more than 1,000 of the milder cases have been cured at ing him to reserve a copy for you every month. Otherwise he will not be able to Culion and the patient. returned to their homes. Now, only supply your copy. For your convenience, money is needed to provide increased personnel and equipment at we are appending herewith a blank which we ask you to be good enough to fill in Culion so that a perfected cure may be given to the lepers of the and hand to your newsdealer. He will then be in world. This was Leonard Wood's dream and it was he who asked a position to supply copies to you regularly every month. If you are the American people for help, just before his death. interested in reserving your copy every month, do not fail to sign this blank. It costs you nothing -If -Thou wilt Thou canst make us_ clean." Yes, the same old to do so. prayer, but this time it is addressed not to the Man of Galilee but to You. You can help rid the world of Leprosy-Stampit Out To Newsdealer all check aid heroic men for time-by simply sending your to the Address and women who have buried themselves among the lepers and are Please reserve for me copies of devoting their lives to this great. task. SCIENCE AND INVENTION every month until I notify you otherwise, and greatly oblige,

Interesting informationon this subject may be obtained Name by writing the National Chairman, General James G. Address Harbord, or better still, send your check to, the National Treasurer, General Samuel McRoberts.

"Metal, he said," Drake mused. "Things of metal with brains of thinking crystal, Address all -Communications to . and their blood the lightnings. You accept that ?" "So far as my own observation has gone -yes," I said. "They are metallic, yet mo- LEONARD WOOD MEMORIAL bile. Crystalline, of course, in structure I MAT)IS(1N AVENIJF NEW YORK CITY and highly complex. Activated by 'magnetic - electric forces consciously exerted, and as much a part of their life as brain energy and nerve currents are of our human life. Agents Wanted Animate, moving, sentient combinations' of metal, crystal and electric energy." Anti- Mist He said : "The opening of the disc from the globe, ' - ,- Guarantees Clear '. and of the two blasting stars from the r)-."..F4 : Vision pyra- rnuriwrrr^"V,eY t: mids show the You can quickly build a flexibility of the outer -plate o- would pqhi J fl big money -making bust- you call it? I couldn't help thinking nee., of your own selling of the armadillo LEARN. CARTOONING -a Anti-Mist. Sells to auto supply after I had time to think stores, opticians. druggists, cigar at all." stores, garages,i street car companies. Anti- railroads and At Horne -Simple Method STEAM-PROOF24 "It may be"-I struggled against a con- Sust andtWATEÁPROOF. One application last hors. viction now think - WO to over 8250 a week paid to good money back strong upon me-"it may be cartoonists for work fun! Clear vision guaranteed In all weather; that's And YOU can learn car- guarantee If it that within that metallic is tooning at home-no matter If you've never touched a fails. shell an organic drawing pencil. Send postcard fur FREE Book describing Others are doing It. body, something soft-animal, as there is our ~piffled method and Offer to New Students. WRITE $50 to $100 WEEKLY Sells on sight. Antl- within NAME PLAINLY. State age and whether Mr., Mrs., or Mist retails at 35c for 'f oz. can -51.50 for S nz. can. the horny carapace of the turtle, M. (No salesman will call.) Send 35e NOW for sample N oz. can and full particulars. the nacreous valves of the oyster, the shells WASHINGTON SCHOOL OF CARTOONING Gaston Mfg. Co.. 653-5, 4216Lincoln Are.. Chita's. III. of the Room 262-F, 1113 15th St., N. W., Washington, D. C. crutaceans-it may be that even their inner surface is organic-" "No," he interrupted, is Insure your copy reaching you each month. Subscribe to Science and Invention --$2.50 a yeaf. "if there a body -as we know a body-it must be I Experimenter Publishing Co., 230 Fifth Avenue, New York City. between the outer surface and the inner, for the lat- Science and Invention for February, 1928 941 ter is crystal, jewel hard, impenetrable." "What makes you so sure?" I asked. . "Ventnor's bullets hit fair," he said. "I saw them strike. They did not richochet- dropped dead from that shining thing. i ' they 49.,..,.,-..tI flies dashed up against a rock-and it Like x.-- - y A r '-'*- was no more conscious of their striking than 1 been of those same flies." 1111M1I - a rock would have Y 1rV._-,. ,.. "my own conviction is -so.` ' "Drake," I said, that these creatures are absolutely metallic, ¡ as we understand that . r entirely inorganic, r r !. , _`// , F Let us T1 ,6 ti d. term-incredible. unknown forms. . 1. basis." y go on that {1 a, "I think so, too," lie nodded, 'but I wanted 4 r 1t/.1 it so in- y you to say it first. And yet-is r I( . ? is the defi- J 1,i ( ,rt credible, Dr. Thornton? What iU< ' ' . nition of vital intelligence-sentience? 1 ' I said, w. "Haeckel's is the accepted one," / , y "Anything which can receive a stimulus, that can react to a stimulus and retain memory 'It' must be called an intelligent, of a stimulus . conscious entity. The gap between what we the organic and the inor- : have long called o .trz. ganic is steadily decreasing. Do you know of the remarkable experiments of Lillie upon metals?" "Something," he answered. "Lillie," I went on, "proved that under the electric current and other exciting me- diums, metal exhibited practically every re- "Get the message through" action of the human nerve and muscle. It grew weary, rested, and after resting was perceptibly stronger than before. It got 1n Advertisement of the what was practically indigestion, and it ex- hibited a peculiar but unmistakable memory. American Telephone and Telegraph Company Also it could acquire disease, and die. "Lillie concluded that there existed a real metallic consciousness. It was Le Bon who first proved that metal also is actually more sensitive than man, that its immo- IN THE Sixties the "pony Bell System is the lineal bility is only apparent. descendant of the pony "Take the block of magnetic iron that express" carried the mail stands so grey and apparently lifeless, sub- over mountains and Indian express. ject it to a magnetic current, and what hap- pens? The iron block is composed of mole- wildernesses from St. Joseph, It is this spirit of responsibility cules which under ordinary conditions are to San Francisco. The that causes operators to risk disposed in all possible directions indiffer- Missouri, ently. But when the current passes through express riders and station their lives by remaining at their there is tremendous movement in that appar- in face of fire, ently inert mass. All of the tiny particles keepers won undying fame for switchboards the of which it is composed turn and shift until getting the message through, flood or other great danger. The their poles all point more or less approxi- mately ín the direction of the magnetic regardless of hardship or danger. same spirit calls linemen or re- force. go out, even at the "When that happens the block itself be- Today, in the city of Denver, pairmen to comes a magnet, filled with and surrounded there is rising on the site of one risk of their lives, to repair the by a field of magnetic force. It is instinct with it. Outwardly it has not moved; actu- of the old pony express corrals lines in time of accident or storm. ally there has been prodigious motion." another splendid structure dedi- There are no instructions re- "But it is unconscious motion," he objected. service of modern quiring Bell System employees "Ah, but how do Not: know it is ?" I cated to the asked. "If Jacques Loeb was right, that ac- message-bearing-the new to endanger their lives. It is tion of the iron molecules is every bit as conscious a movement as the least, and the headquarters building of one of the spirit of communication that greatest, of our own. There is absolutely no the companies of the Bell Sys- bids them, "Get the message difference between them. Loel>-all he did was to restate destiny, one of humanity's tem. In fact and in spirit, the through." oldest ideas, in the terms of tropisms, in- fusoria and light. Loeb was Omar Khayyam chemically reincarnated in the Rockefeller L Institute. Nevertheless, those who accept his theories have to admit that there is essen- tially no difference between their impulses and the rush of filings toward this magnet." "The block of iron meets all of Haeckel's three tests-it can receive a stimulus, it BUDDY°H11RH"c1,OCK reacts to that stimulus, and it retains mem- Profitable spare time work for winter. Make them for yourself or turn ory of it. For even after the current has idle hours into welcome dollars, building clocks from our instructions. ceased, it remains changed in tensile strength, We furnish the plans, instructions, blueprints,- works, dials, and all conductivity and other qualities that were materials at surprising low prices. You make a fine profit building clocks modified by the passage of that current. And 14.+fit for your friends. as time passes, this memory fades. Pre- Banjo Clocks, Mantel Clocks, beautiful Grandfather Clocks with cisely as some human experience increases chimes complete; works as low as $5.00. Other styles at all prices. wariness and caution, which keying up of ASK FOR OUR CATALOG AND ALSO FREE BLUEPRINT PLAN qualities remains with us after the experi- ence has passed, and fades away in the ratio AMERICAN CHIME CLOCK COMPANY of our sensitivity plus retentiveness divided 1679 RUFFNER STREET PHILADELPHIA, PA. by the time elapsing from the original ex- es' perience-exactly as it is in the iron." "Granted," he acquiesced. "We now come Insure your copy machine yon each month. Subccrihe to Science and Invention -52.50 a year. to their means of locomotion. In its simplest Experimenter Publishing Co., 230 Fifth Avenue, N. Y. C. terms, all locomotion is progress through 942 Science and Invention for February, 1928

:t space against the force of gravitation. Man's walk is a series of stumbles against this force that constantly strives to drag him down to earth's face, and keep him pressed there. Gravitation is a magnetic vibration akin to the force which holds, to use your simile again, the filings against the magnet. 2niliant Savels A walk is a constant breaking of the current. Take a motion picture of a man walking z in and ruts it through the lantern rapidly-and . he seems to be not walking but flying. We 3 BOOK have none of the awkward fallings and re- coveries that are the tempo of walking as

lR1'MLg: ,..,. FO RM _ we see it." !I't.0AD ANDA'fh. "I take it," I said, "that the movement 'Ai,, of these Things is a conscious breaking e of lttl r the gravitational current just as much as . is our own movement, but by a rhythm so ..... 2e swift that it appears \ to be continuous." 1 "If we - could so control our sight as to titi; ! 41`,,. I admit the vibrations of light slowly enough," he agreed, "we would see their apparently ' t<. , smooth motion as a series of leaps-just as we do when the motion -picture operator slows down his machine sufficiently to show us walking in the series of stumbles. "Very well," I said, "so far, then, we have nothing in this phenomenon which the human --. mind cannot conceive as possible. Therefore, intellectually, we 1 he WITHOUT still remain masters of the Flir. Brigade phenomenon. Y4°, For it is only that which human thought cannot encompass which it need PRECEDENT fear." SUCH A BOOK OFFER ! BOORS -8 for $1-it astounds your sense of value! $5,000 for. D Fast production made this offer possible. But that tremendous supply is fast diminishing. How could it last-8 for 81. Perpetual Motion Now-take advantage of this offer while e is still the The editors the opportunity. Select any 8 of the 18 titles listed below, have received thousands of different designs of perpetual motion de- and you will be assured of prompt delivery. vices, and have received hundreds of cir- As you can readily see, these books are the latest crea- cular letters soliciting finances for the building of L i tions of modern fiction. Of such merit are they, they were perpetual motion machines. grasped by the motion The editors know that if they receive ,7$¿,,z;,«-"11"1. picture industries and transformed these letters, there are thousands of others 114, , into picture plays. in this country who get similar letters Each volume is handsomely bound with sturdy material and who fall for the claims made in the . S and with numerous prospectuses giving .the earning J14.8LES, illustrated "stills" from each play. They will be capacities of the various machines. .' an addition to your library that will give that necessary Most of the shares of stocks for these r."' ..°\ touch of variety. perpetual motion machines are being sold Order now, by number, from the titles below. at a rate of $1.00 per share, although some pl inventors are trying to sell shares of stocks at 5100.00 per share. Il HERE ARE THE TITLES: -1 Therefore the editors of this publication I 1. New York 7. The Dixie Flyer 13. The Road to Mandalay say, "Just come in and show us-merely 2. Campus Flirt 8. The New Klondike . 14. Tracked by Police the SHOW us-a working model of a per- I4a 3. Almost a Lady 9. Forbidden Waters 15. Tell It to the Marines petual motion machine and The Love Th we will give 4. of 10. Sensation Seekers 16. What Happened to Jones you $5,000.00. But the machine must not 5. Les Miserables 11. The Rambling Ranger it. the King of the Jungle be made to operate by tides, winds, 6. My water- That's Baby 12. Don't Tell the Wife 18. The Cat and the Canary. power, natural evaporation or humidity. It must be Place Your Order While the Supply Lasts perpetual motion." ate ------~ M - - MI MI *MAIL YOUR CONSRAD CO., INC., 230 Fifth Ave., New York, N. Y. 1

"Metallic," Drake said, "and crystalline . Gentlemen: I enclose SI for books Numbers ORDER NOW And yet-why not ?-why not ? What arc we l but bags 1 Name. 1 of skin filled with certain sub- CONSRAD CO., Inc. stance in solution and stretched over a sup- 1 230 Fifth Avenue 1 Utirte porting and mobile mechanism largely made up of lime? Out of that New York, N. Y. 1 Cit ' State 1 primeval jelly which Gregory calls protobiott we came, after untold millions of years, with our skins, our nails, and our hair ; came, too, the serpents with their scales, the birds with DoubleYour Pay their feathers; the horny hide of the rhi- noceros and the fairy wings of the butter- fly; the shell of the crab, the gossamer love- EasyWay liness of the moth and the shimmering won- at Home 50_0 der of the mother-of-pearls. Is there any Learn TRICKS -10C. greater gap between to Make C1cvcr WE-POPULAR-LEARN TO ENTERTAIN any of these and us Amaze and mystify your friends. Earn Money and the metallic? I think not." at Clubs and Parties. It's easy. No Skill "Not materially," I answered. "No. But required. Our copyrighted book. Fun- Magic-Mystery" tells how and explains there remains-consciousness." SNOW CARDS ° many Tricks you can do. Also catalogs over , "That," he said, "I cannot 'Prepare, now. No special ability nee ed if you learn t home by 00 Mystifying Tricks-Illusions-Jokes- understand. thin ma r, complete and practical method. Student R. A. Hart , Puzzles-Books--European 'Novelties, at Re- Ventnor spoke of-how did he put tae, while learning '1 make $2.00 an hour in are time."Her duced Prices. Ncw 1928 Edition, it-a Underood wrote, (clear $25 to $35 a day. ' Other etndenta make profusely group consciousness, operating in 125 or more e week In ,pare time while learning - more when they r. Illustrated, sent postpaid, only 10e. our sphere rreduate. Good Show Card Writers earn 4.50, 035 and 1100 a week. and in spheres above and below 'stirs, P.tplaipsamaring nrrtn- LYLE DOUGLAS, Station A-3, DALLAS, TEX with nets to make per senses known and unknown. I Get Free Book in your owe .. i get- No obli¢etiop. No salesman will call. State age and ar.:,.dMinnorhMrs. or Mrs. ¡PROMPT SERVICE -0-LOW PRICES glimpses-but cannot understand." WASHINGTON SNOW CARO SCHOOL "We have 1117.1Sth St., N. W., Dept 262-F Washington: D.C. agreed, for reasons that seem sufficient to us, to call these things metallic, TAUGHT AT Drake," I replied. "But that does Write for not neces- BE A DETECTIVE TELLSu sarily mean that they are composed of any Earn Big money. Work home or travel TENOR BANJO Play. metal that we know. Make secret In only expense about 2e tt Nevertheless, being Per Day for vestlgatlonn. Experience unnecessary. Write Dept. 8. A. music and postage used. metal, AMERICAN SCHOOL OF MUSIC they must he of crystalline structure. American Detective System, 2190 Broadway, N. Y. 64 Manhattan Building Chicago, Ill. As Gregory has pointed out, crystals, and Science and Invention for February, 1928 943 what we call living matter and an equal I start in the first essentials of life. We can- not conceive life without giving it the attri- bute of some sort of consciousness. Hunger r. cannot be anything but conscious, and there e :ie. realE is no other stimulus to eat but hunger. `I '.i-ue.. 1 he crystals eat. The extraction of - power from food is conscious because it is +- purposeful, and there can be no purpose - 3 without consciousness. Similarly the power e to work from such derived energy is also purposeful and therefore conscious. The 4/ crystals do both. And the crystals can trans- mit all these abilities to their children, just rr a1 . ,q as we do. For although there would seem : .t to be no reason why they, should not con- 41. tinue to grow to gigantic size under favor- II able conditions-yet they do not. They reach a size beyond which they do not develop. Instead, they bud-give birth, in fact-to E. smaller ones, which grow and increase pre- b. 1 cisely as their progenitors. "Very well, then-we arrive at the con- ception of a metallically crystalline being, which by some explosion of the force of evolution has burst from the, to us, familiar and apparently inert stage, into these creatures that hold us. And is there any greater difference between the forms with we are familiar and them, than there which .1 is between us and the crawling amphibian ACTUAL PRACTICAL which was our remote ancestor? Or be- EXPERIENCE LESSONS tween that and the amoeba-the little swim- ming stomach from which it evolved? Or the amoeba and the inert jelly of the pro- tobion ? "As for what Ventnor calls a group con- sciousness I would assume that he means a And Enjoy New York While Learning communal intelligence, such as that shown by the bees and the ants-that which, in the giving full case of the former, Maeterlinck calls the ABOVE is pictured a corner of one information about the 'spirit of the Hive.'" of our two seven -story buildings. N. Y. E. S. Course and showing pic- "But metal !" Drake mused, "and con- Here, actual work is accomplished and tures of the equipment available for scious ! It's all very well-but where did practical experience is gained-plus a your personal use in our two seven - that consciousness come from? And what thorough course in electrical theory, story buildings. IT IS ABSOLUTELY is it? And where did they come from? And FREE TO -why haven't they overrun the world? Such under highly competent instructors YOU. development as theirs, such an evolution, who are themselves, Electrical Experts. The New York Electrical School pre -supposes aeons of time-long as it took New York Electrical School-this is us to drag up from the lizards. What have 29 W. 17th St., New York they been doing-why haven't they been a school noted throughout the world ready to strike-if Vcntnor's right-at hu- for its extensively equipped, modern MAIL TODAY manity until now?" shops, and for the high standard "I don't know," I answered, helplessly. of electrical men released each year. The New York Electrical School "But evolution is not the slow, plodding :9 W. 17th Street, New York process that Darwin thought. There seem The thousands who graduate are to be explosions-nature will create a new eagerly placed by the big electrical Please send me FREE your 48 -page booklet, form almost in a night. It might be so of companies who recognize the real It is understood that this request puts me under these-some extraordinary conditions that value of men trained by the New no obligation.' shaped them. Or they might have developed School, through the ages in spaces within the earth York Electrical Name -there's that abyss we saw that is evidently ACTUAL EXPERIENCE ry one of their highways. Or they might have -address dropped here upon some fragment of a PRACTICAL LESSONS broken world, found in this valley the right THOROUGH KNOWLEDGE conditions and developed with amazing ra- Town .. State pidity. They're all possible theories-take ,Write today for the 48 -page booklet your pick." "You think then that these things are made up of myriads of tiny specialized crystals, Pointed s just as our own bodies are made up of Six lust Draw Six Straight Lines myriads of tiny specialized With Four Dots on Each Line = cells?" t will give stay four wain. and 30 other big prices making "That's it in a nutshell." total of $6000 00 in prow. We have already given oral $42,000.00 in prize. to advertise so, badness Including 9 . . "Something's held them back-and flack. and many other ears. Now YOU can g0 YOUR Bait& they're Sudan or $1.ee.00 in cab. GET BUSY rushing to a climax," he whispered. "Vent- nor's right about that-I feel it. And what ' H NEW 1928 BUICxor can we do ?" "Go 20 CASH back to the city," I answered. "Go $1800 Money!III .n.werit costa nothing! Draw hack as he ordered. It wasn't just a request Send No rliv n ee nr with Bales B the center. Dow the lio lt .t the scot he made, nor even an appeal-it was a com- 4 New Autos Given! rholorfer. Ít m.7dmeno your& winnning a 1R101ck Seto, orout mand." 1st prize, Buick You Can Win $1800.00 Cash "It was more than that," said pedan, 2nd Any winner can tare cash instead of prize r Drake, prive, N h won.Prat price,ahner can have Buic Sedan worth D296.00 and íL06 In cub total 81,800. slowly. "But what can we do against- Q' ,Sledso, 3rd ou do not risk one cent. now, later. or evert $505 t hem ?" .... - paw, Eeaez Leola L. of Virginia eceived EXTRA Sedan. 4th 52.500.50kchock. 0 A.arko. drewu. horse Creek "That we may find out-when we're in prise,Chevrolet WW yo.,rnceircd Buick Sedan. Big Ibt of former for the Sedan. 28 other awe winners sent you. Everyone doll.. good work rewarded. Duplicate pries can of Ikea. city," I answered. .loable 600 N. ne.rborn SL Iprompt- 'Well," said Drake, some of his old cheer- total 86,000.00. T. W. Kell yy Dept. 209 Chicago ness fulness breaking through, "in every crisis of this old globe it's been up to one man to CAL. turn the trick. We're two." ALL FREE .. RIFE For a time we were silent. 10 tman ``car. Watch ,.o chain and ring. large Footman ducha 22 Bete. - hour I ranofor lesatd chor.dli.utdperfumaliquid at 1s - "Well," said at last. "we have to go to abettls.eendtor 20 bottleaand chope giftuperotrer ¡flour unglue :W Puri the city in the morning." row-ia.twrite to BELL PERFUME CO.. Del. E.-943, Chleugo, YU. 944 Science and Invention for February, 1928

"You sound as though we were living ill the suburbs and had to catch the 9:15; he remarked. to ,4Iars It can't be many hours before dawn," I the Peg Planet said. 'Turn in for awhile, I'll wake you land of queer places-amazing stories-startling scenes-strange people when I think you've slept enough." "It doesn't seem fair," he protested, but sleepily. "I'm not tired," I told him. Whether I was or was not, I wanted to question MASTER MIND Yuruk, uninterrupted and undisturbed. Drake la1P51A.N stretched himself out, head boring about for a. NU.A- L y the softest spot in his saddle -bag. of MARS Feáturirig the Néw' \Vhen his breathing showed him fast by EDGAR RICE MasterMind of Mars" ' asleep, I slipped over to the eunuch and BURROUGHS By crouched, right hand close to the butt of my automatic, facing him. E i . C C CHAPTER SEVENTEEN YURUK Amazing C4yURUK," I whispered, "you love us as the wheat loves the hail. We are as welcome to you as the cord to the condemned. Lo, a door opened into a land of unpleasant dreams and we came through it. Answer my questions with truth, Stories and it may be that we shall return through that door." He stared at me, eyes suddenly bright. "There is a way from here," he muttered. "I can show it to you." "Where does that way lead?" I asked, Annual not blind to the flash of malice that had shot across the wrinkled face. "There were men who hunted us, men clad in armor the first - with javelins and arrows. Does your way lead to them, Yuruk?" For a time he hesitated, the lashless lids IrT took the genius, half closed. Edgar Rice Burroughs, to produce this absorbing "Yes," he said sullenly. "The way does Master Mind of Mars. lead to them. But will it not be safer for Read it! It will give you reading pleasures and thrills unending. It is you there-among your kind?" released for the first time to the public in the first 1MAZING STORIES "I don't know that it will," I answered. ANNUAL. "Those who are unlike us smote those who are like us and saved us from their chains. But not alone this eminent scientific writer of thrilling and amazing stories, Why is it not better to remain here, than to go our Edgar Rice Burroughs, there as 1. to kind who would destroy us?" are others, such II. G. Wells, Merritt, "They would not," he said. "If you gave and Murray Leinster. them-her." He thrust a long thumb back- ward toward sleeping Ruth. "Cherkis would Only those who have read AMAZING STORIES magazine know the dis- forgive much for her." tinctive character of the stories in the first AMAZING STORIES AN- He leered at me. NUAL-strange people will fascinate you-tense moments will grip you- "Besides," he added, "have you no arts exciting events will weave about you! 132 Pages, large magazine size. to amuse him?" "Cherkis ?" I asked. Buy this book of AMAZING STORIES "Cherkis," he whispered. "Is Yuruk then a fool not to know that in the outer world new things must have arisen since long ago EXPERIMENTER PC B. CO., INC., we fled from Iskander into the secret val- 230 Fifth Ave., New York, N. Y. ley? What have you to take to Cherkis Gentlemen: I enclose 50c. for one copy of beside this woman flesh? Much I think. "Amazing Stories Annual." Then go to him-unafraid." USE AT THE "Yuruk," I asked, "is she whom you call Name COUPON OR NEWSDEALERS goddess-Norhala-of the people of Cher- kis ?" Address EXPERIMENTER PUB .CO., INC. "Long ago," he answered ; "long, long 230 Fifth Ave., New York City ago there was trouble in their city, even in City, State Ruszark, the great dwelling place of Cher- kis. I fled with her who was the mother of the mother of the goddess. There were gind'the twenty of us; and we fled here-by the way WIN which I will show you-" $300 He waited, but I gave no sign. O ! s "She who was the mother's mother of To advertise our product we are going to give ovey the goddess, found favor in the sight of the $6000.00 in prizes. Have already given away thou- ruler here," he went on. sands of dollars. Virginia Umbarrgg r won $1446.00 "But after a time Effie Swearingen, $1600.00,Louis SUtbergt2000.00, and she grew old and ugly others. and withered. So Addresses on request. You can win $3000.00 he slew her. Like a little mound of dust Can You Find the Twins? she danced, and blew away after he had slain No. It's not as easy as it looks because two, and only two of the hats on the girls pictured to the right are her. Also he slew others who had grown exactly alike. Find them-mark them-send your displeasing to him. For a time she who was answer today. 350 big costly prizes will be given and , duplicate prizes will be paid in case of ties to those the mother of the goddess delighted him. tying. Costs you nothing, now, later, or ever. All Then who answer can share in cash prizes. Everybody she grew old, and her also he slew. And rewarded. Send answer-learn how to get this prize. this time he blasted me-as he was blasted-" $500.00 Extra for Promptness `w he pointed to Ventnor. - making total prize you can win $3000.00 Send no 3,5O "Then it was that, recovering, I found money, just find twin hats mark them answer today my crooked GI -A. Cúlver, lnaM Roomer shoulder. But years before 210,1,sou worn wa.00r, se., enk.ae , ;Prizes that the goddess was horn. He who is ruler here visited her mother often, and she is kin to him-certainly. How else could I Insure your copy reaching you each month: Science and Invention-$.50 a year. I she Subscribe to shed the lightnings? Was not the father Experinieñter Publlshing'Co., 230 Fifth Avenue, N. Y. C.., of Iskander the god Zeus Ammon, who Science and Invention for February, 1928 945 carne to Iskander's mother in the form of a great snake? Well? The goddess was born-shedder of the lightnings even from her birth! And she is as you see her. He he I" he chuckled. "He -he ! They grew old and they were slain. But I who am indeed old hide when they come. And so I live. He -he "Cleave to your kind! Cleave to your kind !" croaked the black eunuch. "Better is it to be flayed by your brother than to be eaten by the tiger! Cleave to your kind! Look-I will show you the way." He sprang to his feet clasped my wrist in one of his long hands, led me through the curtained oval into the cylindrical hall, parted the curtainings of Norhala's bed- room, pushed me within, and pressed against the farther wall. An ovoid slice slid aside, revealing a wide doorway. I glimpsed a path, a trail, leading into a forest pallid green beneath the wan light. "Follow it," he pointed. "Take those who come with you and follow it before-They e ail List -slay you.' , Completely TRADE MARK EGISTERfiO The wrinkles upon his face writhed with Assembled his eagerness. MAGNff10ENT TONE-SUPER SELECTIVE -POWERFUL DISTANCE GETTER "You will go?" panted Yuruk. "You will CQ to take those who came with you and go by ey sw wwv..y ;r rBatterySe.I Sifjg.s that path ?" America's big old, reliabn Radio a sera-wholtovghta tertharongh "Not yet," I answered absently. "Not Corporation th successful year) comparisons - ante programs ev guarantees m its big powerful, Coast to Coast, Canada to Mexico, u.1RHIWIÍI yet." latest 6. 7 and S tube hHraco sets loud and clear-w:tb the nagnif- he was abruptly brought to full alert- the finest, most enjoyable per- centeathedral tone quality fcost- And formanceobtainableiDhighgrado Lest sets. Don't confuse t, iraco's ness, vigilance, by the flame of rage that radios." Unless30days'useinyour with cheap, "squawky" radios. borne fully satisfies you a Mtraco Iliraco's have finest parts latest filled his eyes. Is unbeatable at any price for approved shielding, metal cltaasis, "Lead back," I directed curtly. He slid beautiful, clear cathedral tone etc.-as used in many $2s0 meta. razor -edge selectivity, powerful' DEAL DIRECT WITH 7tube sullenly. sets-SaROCO dPo ibs . the door into place, and turned distancereception, easyoperation BIG FACTORY and 7 rood.mod. buy die8 is magnificent:, one dial wondering what were the sources Mc.-don't ltl Y your Miraco reachesin-haCORPsom -have gnlaeandy I followed, final. Save or make lots of y assembled. rigidly tono goal ci. Tarenr ose al METAL SHIELDED moneyyou no Turn onhero 1 of the bitter hatred he so plainly bore for on sets and equipment-write for fully guaranteed. Easy to connect utons v CHASSIS to be rid testimony of nearby users and and operate. 30 days trial free. Ultm-eeleetivef latest sib us, the reasons for his eagerness Amazing Special Factory Off or, 5 year guarantee if you boy. You mew shielded chassis. it- of us despite the commands of this woman work equally fino on take no risk, you insure satisfac- lam+osted dial.FWly gguuar- di073I MIraeo's Son you enjoy rock bottom money mtecd.Try one /Nee Ion = w who to him at least was goddess. AC electric house current sav(ng preas by dealipg direct aIth 3O darsl Big selection RETAIL or with batteries. Take your ens o! radio'' olds t most successful of beautiful cabinets. LIST And by that curious human habit of seek- Choice/. Many thousands of Miraco buildereof8neeets.btbswcessfulyoar. protlts show+nq Mlrsco ing for the complex when the simple answer /}ea ers Wile!}a u ill;11ndsT GIt Our SblgpectatTION. vrices l ElectrifyILA-a'g),, Any Radio RADIO lies close I failed to recognize that it was -- d MID -WEST CORPORATION, Cincinnati.Clnelnnatl. O. BEAUTIFULLY ILLUSTRATED CATALOG MIDWEST NO -BATTERY only jealousy that was the root of his be- Light Socket havior; that he wished to be, as it would seem he had been for years, the only human Power Units being near Norhala. Yes, I failed to real- r DAYS' TRIAL, 81eciai T rd', Wholesale Price Offer to User -Agents, Bank a";1:4from Ruth and Drake was ter- cis ht socs ize this, and with 1 References, testimony of nearby Miraco users a out bstterieei. Write , you -7;1.1'a: ribly to pay for that failure. -all the proof want-sent with catalog t prices anddi.eomte Un - 1J Ittsare h+ beet grade -tunny sleeping de odabe, ometin rsti I looked down upon the pair, ruñswaranteed iragral Ventnor lost still in trance. mail coupon now i soundly and upon ANOTHER BIG BARGAIN! I ordered the eunuch. "And turn Rs, Dowerful big Mimeo RE "Sit!" Buyerú, 1a7a model -ultra .e. hack to me again." lecurel Thousands ens +e out- MIDWEST RADIO CORP'N your performs ts of mucks higher +P It Sets b Pioneer Builders of As he obeyed, a question long deferred at pnc 0 Oars Trial Free, [+ Fuly G reed- 409-C Mimeo Bldg., Cincinnati, Ohio. last found utterance. couperr * -.Town 'L"-`- r 1 "WlmOur OBLIGATION, mend me free literature. AtdALINt SPSGIM "whence came this house °-= a W BOLEISAL*l 1'iUUC4 O5'r'e: te.tueuur of uesrby u.e .. eta "Yuruk," I asked, y

tc,_.7: 1 in which we are? Who built it?" 7, L 4 "??r "The ruler here," he answered sullenly. NAME "He made it for the delight of the mother .1 of the goddess. And slew her. Never for- 'ia, 1.T U ADDRESSES get that-he slew her!" I dropped down beside Drake. Glibly enough I had passed over his questioning Travel For "Uncle Sam" as to the consciousness of the Metal People. How I faced it, knowing it to be the very " RAILWAY $158 TO $225 MONTH crux of these phenomena, admitting, too, POSTAL CLERKS Mail Coupon Before You Lose It pleading it was that despite all my special ill ---MIMR IRE 1 -e. - -- about this point the thickest mists of un- FRANKLIN INSTITUTE, Dept. W182 Rochester, N. Y. certainty whirled in my own mind. Sirs: Rush to me without charge, copy of That the sense of order possessed by the 32 -page book, "How to Get U. S. Govern- was immensely beyond man's was Work -No Layoffs -Paid Vacations anent Jobs," with list of positions obtainable creatures and full particulars telling how to get them. plain. Just as plain was it that their knowl- , Travel-See Your Country Name edge of magnetic force and its manipulation Common Education Sufficient 411 were beyond the sphere of humanity. That Boys-Men, 17 up-Mail coupon today sure. Address they had realization of beauty this palace of Norhala's proved-and no human imagina- tion could have conceived it nor human hands have made its thought of beauty real. And consciousness itself-after all what AN YOUDRAW? COPY'TH-IS SKETC* is it? and let us see whether you 'lave a talent for drawing. ` A secretion of the brain? The cumulative Opportunities Abound in this wonderful profession for anyone who has a liking for drawing. You Zr'' need only to develop your talent to earn a share of tie millions paid each year for Commercial Art. ¡ - expression, wholly chemical, of the multi- Learn at home -You can study anywhere, under our resultful system of home study instruction, tudes of cells that form us? The inex- ° with the constant help of artists high in their profession. plicable governor of the city of the body Big illustrated Book Free of which these myriads of cells are the Tells you hundreds of interesting facts about illustration, comñserdal art and t1 cartooning. It's an unusual publication of great value and importance to you. citizens-and created by them out of them- Write for it today-there's no obligation whatsoever. selves to rule? North American School of Drawing It is what many call the soul? 132 Station "C" Buffalo, N.Y. - Or is it but a finer form of matter, a FOR FREE CRITICISM self -realizing force, which uses the body SEND SKETCH 946 Science and Invention for February, 1928

as its vehicle as other. forces use for their vestments in other machines? What is this conscious self of ours, the A ' ego, but a spark of realization running con- Challenge tinuously along the path of time within that mechanism we call the brain? Making con- Radio's Latest! tact along that path as the electric spark at the end of a wire? Is there a sea of this conscious force which laps the shores of the farthest -flung stars; that finds expression in everything- man and rock, metal and flower, jewel and cloud? Some energy limited in its expres- sion only by the limitations of that which it animates, and which in essence ís the same in all. If so, then this problem of the conscious- ness of the Metal Horde ceased to be a problem, for it was answered. ' So thinking I became aware of increasing light, strode past Yuruk to the door and peeped out. Dawn was paling the sky. I stooped over Drake and awakened him. "I only need a little sleep, Dick," I said. "When the sun is well up, call me." "Why, it's dawn," he said. "Professor, you oughtn't to have let me sleep so long. I feel like a damned pig." On All Solve them .1 "Never mind" I answered. "But watch Newsstands Yuruk close." I rolled myself up in his warm blanket if you and sank almost instantly into a dreamless Most can slumber. SECOND SERIAL RIGHTS CONVENIENT HERE are 116 pages of extra- (To be continued) ordinary puzzles. HELPFUL Sam Loyd, the master puzzler, has MODEL COMPLETE devised a new set to try your mind. DEPARTMENT BLUEPRINTS Puzzles of all sorts, with a special 26 - page section of scientific puzzles for Correct-Easy to Follow of Call Books the mechanic, the engineer or the man with a scientific trend of mind. 1-2 Horizontal Steam En- gine details set $1.00 It is fine fun and excellent training for 3-4 Boiler construction for Radio Listeners' the mind. above set $1.00 above set $1.00 Get the Book Now 5 880 Ton Bark 50c Guide & Call Book Sam Loyd's Tricks and Puzzles 6-7 Twin Cylinder Steam Engine and Boiler. set $1.00 8-9 Gasoline Fired Loco- motive set $2.00 COMPLETE-Here in Radio 10-11 U. S. S. Constitution, Listeners' Guide and Call 50c "Old Ironsides" set $1.00 Book, are listed the latest addi- 12 13th Century Man - On all Newsstands -of tions and changes of stations War 50c throughout the U. S., Canada or Direct 13-14 Chinese Junk set 50c 15-16 Electrically driven and foreign stations. This is the EXPERIMENTER PUB. CO., INC. Automobile , set $1.00 most up-to-the-minute of all ,230 Fifth Ave., N. Y. C. 17-18 How to .Build a Re- Call Books. flecting Telescope .. $1.00 19 Roman Ballista 50c Convenient! These stations, 20-21 Simple Steam Engine, alphabetically listed, are at your set 50c immediate command 0tizERADIO 22 "Santa Maria," complete 50c for refer- 23-24 Model U. S. S. Ports- ence. With adequate space for ft.a..eadeO 98 dial markings! For Far andous r$l mouth set $1.00 Coma to sceeptiioale Fioe of 25 Building a Model selected, onwrise-t f built Tug- tooted parts. Thousand. now ii, use. Helpful! FREE Log Cod Coll Rook and New 132-y. ('atria( boat 50c In Radio Listeners' NMI, thousand. of nationally .d.ertlnedb.ru.ipa Lteetinr.dlo.tbin musings -Mirka for tree copy. Guide and Call Book is a section AMERICAN AUTO & RADIO MED. CO. Send Orders to tlANNT eCN W NO. devoted to the latest develop- OW, 271 Redod *mermen .. Dlds..Olds.. Ransm Cdt, Ms. MODEL DEPARTMENT ments in Radio-new circuits POPULAR can POPULAR SCIENCE AND INVENTION and apparatus, and a host of in- i] CHEMISTRY CHEMISTRY A Monthly Chemical Magazine 230 Fifth Avenue formation that will guide you Latest c(emMa1 nears, experiments, for- and help you to successfully mulas, recent advancements in medicine. New York City and other Interesting features. Three operate your set. trial copies. 30 cents (no stamps, please). One year for 51.00. Book catalog tree to yearly subscribers. 200 pages; hundreds of illustra- POPULAR CHEMISTRY CO. tions; beautiful cover; size 9x12 in. Dept..FB Swedesboro, N. J. Radio Wrinkles Wanted!

Leare. The Radio Editor, Mr. Paul E. Welker, wants to - hear from you, EVERY 50c. WHERE L,.'_ if you have a good idea or- wrinkle. OR DIRECT Make a pencil or pen and ink 1, O 110 -at HOME. sketch of the contrivance, write 50 CONSRAD COMPANY, Make money taking pictures. Preparo quickly during words or so of description, and INC. (spare time. Also earn while you learn. No experience aary New easy method. Nothing eta* like It. mail to the Radio Editor, c/o this 230 Send et once for free book. Opportunities in Modern Fifth Ave., New York City end full magazine. Photography, particulars. UP AMERICAN SCHOOL OF PHOTOGRAPHY Dept.3422, 3601 MIchipan Ave. Chicago. U. S. A. 947 Science and Invention for February, 1928

Pendulum Locates Oil iscovery "No -FROST" Deposits KEEPS By S. R. WINTERS AUTO WIND- ` Offers (Continued from paye 891) SHIELDS pay CLEAR investigations and researches made by the a PROFIT/ United States Coast and Geodetic Survey. 15, cost of establishing gravity stations in The Here's an absolutely new money-making idea. Brings big profits- large number over a moderate size area easy profits-quick profits. You can make $50 a week in spare small, even with the a week in full time-helping me handle orders in your would be comparatively time-$100 is a new scientific preparation present It is possible territory for No-Frost. No -Frost that is gravity apparatus. absolutely guaranteed to keep steam, frost, fog, rain, sleet, mist. and that, in the near future, methods and instru- snow off auto windshields, windows, eyeglasses. Think of it! Keeps ments will be perfected with which the val- glass clean, bright, and clear in all kinds of weather. may be obtained at a much KEEPS STEAM ues of gravity OFF aIRRORS lower cost in time and money than with the Anyone, methods and instruments now employed." FOR Make Big Money Thus, future oil prospectors, instead of SHOW WINDOWS Anywhere, Can or scratch. Yet keeps glass clean and clear as crystal. exercising the wand of a forked twig of tree to housewives, : ntomobile All you do is demonsErnte the orders A necessity for every auto owner, storekeeper, street or watch spring in denoting hidden wealth owners, stores, garages, etc., and take car conductor, locomotive engineer, housewife, and dealers. All business from your in the bowels of the earth, may be seen We don't sell to alone pet everyone who wears eyeglasses. Prevents accidents locality must come through you. You the place of mechanical devices that don't wabbling a pendulum and registering the Every demonstration brings and takes the profit on every order. the wort half the time. it. Instead of sending you 2 to 4 orders. Just put a little No-Frost on earth's pull upon smear, mar. forth as oil prospector a delicately gauged glass. It doesn't show. It won't streak, person with a divining rod, whose reflex ac- $ 125 in . One Week tion is supposed to locate oil deposits, petro- Vaughn Clears You can make $10 to $20 a day-right from scien- Ohio, cleared $125 in one week and says profits. leum -searching companies will detail C. Vaughn, before. the start. with pendulums and he has more money and friends than ever tists equipped gravity Men and women everywhere are making amazing JUST MAIL COUPON data on the relation of the pull of the earth profits with No-Frost and my 350 other fast-selling Introduce No-Frost in your territory while it's new- Heintjes, N. J., cleared $30 in 1 day. , are'put on sale in the stores. Skim to the density of material under the earth's products. H. in before imitations rod is as fas- Mrs. K. R. Roof, S. C., made $50 the first meek the rich cream off the profits. Clinch a big, perma- crust. The modern divining spare time. Mrs. B. L. Hodges, N. Y., averages $15 nent, repeat business. Make more money than cinating in its imaginative appeal as the an- to $20 a day-day in and day out. H. C. Hanson you've ever made in your life before. Get the facts cient forked twig of a tree and, in addition, jumped hie pay from $25 a week to $75 a week-and and read the proof. Mail coupon today-NOW! only part time. You can make these big it possesses greater scientific feasibility. he works THE NO -FROST COMPANY, profits too. 74 Monmouth Avenue, Cincinnati, Ohio Without cost or obllgaaon, send me full details about the SEND NO MONEY ioetlbilltles of your amazing new product address on the coupon. money-making Just put your name and $50 NO-FROST. Give me a chance to prove that you can make to Alarm Clock Case from $100 a week. You don't need capital, training, or Name you iust experience. I furnish everything and tell Ad,lrest Wall -Board what to do and say in this easy pleasant work. You to pocket don't risk a penny. Yet it's an opportunity (Print or Irrite plainly) By H. L. WEATHERBY hundreds-yes, thousands of dollars in clear cash (Confirmed from page 906) APPROVED for S. & I. 3 - TUBE DC RECEIVER parts. This calls for a good grade of cab- inet glue, either hot or already prepared cold glue. The secret of successful construction of the clock case lies in careful gluing and in the little square brace pieces which are

C

Type UXB Condenser Scientific Drum Type UXB Control Universal Compact Type UXB Condenser is used will enhance the appear- Beautiful escutcheon shield to 100, in Science & Invention Three Tube DC Receiver. is calibrated from 0 rotor ance of any set. Dial out clearly. This condenser has patent leveled brass stator. with figures and markings that stand Precision spacing assures accurate calibration. Re- of finest pressed Friction drive drum made powerfule movable shaft can be adjusted to any length. Universal improves with use. Action Is smooth and straight-line frequency curve is supplied with mounting. Modified and develops no backlash. This unit takes care of present day broadcasting bands. Type of condensers. List price .0005MF or .00035MF any combination Condensers,mof UXB can be had in either dial, with escutcheon plate, $3.50; capacities. .0003$MF, $2.00 per ualt. LABORATORIES, INC., UNITED SCIENTIFIC TRADE. MARA- NEW YORK CITY 84 FOURTH AVENUE Officer Branch CINCINNATI Los ANGELES CHICAGO NITEDSCIEN,[a ST. Louts PHILADELPHIA SAN FRANCISCO BOSTON MINNEAPOLIS INC. ONTARIO Canadian Officer: LONDON,

t ONE f 1¿51 ~IUDi TZI7-1s EASILY win month from Over 12.000 shops are maklnj great big profits every Appearance of finished alarm clock case. Battery Charging. Every car needs One -Day Battery ser- One Day shoo. vice. Only $35 puts an HR One Day Charging Outfit in your No clamps are Easy terms on balance, quickly paid by yonr increased earnings. placed on all inside corners. trial on absolute money -back guarantee. must he well rubbed to- 30 day? tree needed. but the parts OHIO gether when gluing. Be sure to attach the HOBART BROS. CD. Box S28 TROY, wood bottom with tacks and.glue, as already s O1HER1 the back, part "E," in MORE HD= BATTERY CHARGERS ge ANY L noted. before placing After the glue has been allowed to j position. a year. to twenty-eight hours, you each month. Subscribe to Science and Invention-$2.50 set for twenty-four Insure your copy reaching Avenue, N. Y. C. give the entire case a coat of glue size, Experimenter Publishing Co.. 230 Fifth which is glue thinned with water. After this 948 . Science and Invention for February, 1928

(I has been allowed to dry, the edges of the curves and other places needing it may be sanded lightly to smooth them, or even the careful use of a file will prove to be of con- siderable aid in removing the bumps in the Master Players of uses curves that have possibly been left by the coping saw. Follow this with two or more - ES; atfd even more coats of the desired color lacquer. As a fin- than a thousand ishing touch, add a transfer decoration to the uses. Kester Metal panel. These transfer designs can be pur- BRIDGE Mender solders metal chased from any paint store and are easily as easily as glue sticks applied. to paper. The skill is all Will Give You in the solder - requires The result will be very gratifying and the only heat. old alarm clock or the new one, as the case UNBEATABLE f In the average home may be, will be housed in a POINTERS ¡fir there are innumerable cabinet suitable metal articles from attic to adorn any room in the house.

(1I' 10 Wilber C. Whitehead J. lutelyy unserviceable for The the lack of a touch of world's recognized authority-co-editor of "Auction Bridge Magazine," member and expert of Radio Broadcasting team-broadcasting through l You know these things sixty-four stations, author of "Auction Bridge h nerd attention, and yet Standards," "Auction; Bridge to have some one fix Summary," etc. them would probably Whitehead's Complete Auction Bridge cost as much as repinc- Everything about Bridge by the man best qualified ll ing the articles. to write it. Clear, convincing, up-to-the-minute A touch of heat and illumination of Auction Bridgé in its every detail. l IIouch of Complete with 1926 authorized laws and 200 Kester and the ogiallY) job Is done. It's so easy example hands illustrating modern bidding tactics to use Kester that sol- and play. Flexible cloth binding. Special Price, fl)111111 dering has become an $2.00 "ii interesting and profit- Auction Bridge Standards able fad for thousands A complete explanation of proper bidding. New of people. edition containing the new laws. Cloth, pocket Buy a can from your size. Special Price, $1.50. hardware dealer, gen- eral store, auto supply Auction Bridge Summary shop or druggist. Briefly stating, for quick reference, the salient principles and conventions of Auction. Revised Free Sample 1926 edition with a simple upon explanation of more request important new laws. Cloth, pocket size. Special br...... ,1 Price, $1.00. Milton C. Work Another recognized Bridge authority. Also of the nation-wide Radio Bridge team. Work's "Bridge Pointers and Tests" Shower of terse, illumination Bridge ideas. Noth- ing like it ever attempted before. Here you simultaneously test your ability, stage your con- KESTER ~` test with your friends and gather a wealth of Bridge Knowledge. METAL MENDER 192 Pages. Cloth bound. Special Price, $1.00. Milton C. The Household Solder Bow alarm clock case looks from the rear. Work's "Contract Bridge" Every Bridge player is anxious to know what the difference is between bidding in Contract Bridge CHICAGO SOLDER and bidding in Auction Bridge. Mr. Work explains 1!CÓMPANY 1 it in a short and easy way which a child could 4202-10 Weishtwood understand. Avé. 160 Pages. Chicago. U. S. A. Easy Experiments in Cloth bound.. Special Price, $1.50. Auction Bridge Complete Chemistry AUCTION BRIDGE COMPLETE is not only the By RAYMOND B. WAILES A B C, but also the X Y Z of Bridge. Whether are a (Continued front page 909) you beginner, a player of moderate ability, or an expert, this book will improve your game. PLUMBINGHEATING Let Mr. Work, the outstanding authority, help you Install Your Owi -Save Half to play winning Bridge. 500 Pages. Cloth bound. Special Price, Lowest wholesale prices ciuln compounds, but allows the flame color $2.00. y on highest quality Man óf potassium i A goods. Any Handy Ingo to come through, it appearing loo Bridge Lessons r r can Install his own Plumb.. crimson. The bottle of solution is held frig and Heating BY OUR 100 LESSONS specially selected hands with an NEW EASY METHOD. Get about two inches from the flame, with the impressive lesson in the best and pay only a little every hand S0c each month. substance to be tested on the usual plati- num or infusible alloy Auction Bridge-(1927) Send for FREE Book. wirein the flame, THE RED BOOK published annually with every- New bargain catalog lust Issued. With thing that is new in Bridge 75e our cut-to -fit systems you save waste AN AMALGAM material and high labor cost 50 years EXPERIMENT Ferguson's "Contract Bridge" of economies/ sense, to borne o.. farmer., With the Whist Club Laws and Rules. wilder and hamea, alalieniióiór ranis Tells you Amalgams are alloys of mercury and an- in plain language all about Contract Bridge 75c yes you thee wholeur sstton Writefur your copy other metal. *day. a Platinum and aluminum do Practical back not readily Auction Bridge amalgamate, or alloy with mer- PRACTICAL AUCTION BRIDGE. All about cury, as can be evidenced by trituating a Bridge with full directions for teachers. How to N-LAVIN Co.S7. teach, how to handle Pershing classes,..how _much. to charge t Rd., Chicago, NI. for teaching. Special Price $2.00 course rue men of ambee Short Cut to Standard Auction Bridge clot and marltad iobl. Introducing a quick and easy Electrical Oer 5000 men trained. method of fixing in Condensed course to Theoretical and Practical Elee- your mind the correct leads rules and play of the recognized authorities of the modern game. Special Price """ Engineering thecloys; $1.50 sibleets of Mathematics and Mechanical Drawing. Student.. Foster's "Contract Bridge" construct motors. Install wiring, test elec- The latest thing in Bridge is Contract. trical machinery. Course. designed to be completed playing it Society is In ono CollegeIt peer. almost exclusively. Soon every Bridge player will be playing ít. Why not be among the first to play Contract yourself? thliftBLISS,ELECTRICAL SCHOOL Only $1.00 Weepers fo'yeur Itetnalan la ate Bridge has mounted in the past year to a high , +nett interettlee cityIn the world. . position on the social Catalog on -- calendar. Every hostess request. Jun/ includes in her retinue of social activities many 162 Taktmn Are., WaiSheetoa, D.C. Bridge parties. a r. ry+c r'ld An order of any or these authoritative and instruc- :A tive books will be given our prompt attention.

1 Order Now!

1 con make« ant penman of you at h'&; during roar snare time. Write for my FREE BOOK. '940W TO CONSRAD COMPANY, INC.. BECOME * C000 PENMAN: Your name eleºanti, written on . card . -no eneln.e stamp. Write today. This white mass "grew" from the surface of 230 F.W.TAMRLYN, 424 Fifth Ave., New York, N. Y1 bde. aide., Naneas City. Mo. the aluminum sheet, which was previously rubbed with sodium amalgam. 949 Science and Invention for February, 1928

globule of mercury with a freshly cut shav- ing of aluminum. Mercury will combine You Can Make with sodium, often very violently. Such a product is called sodium amalgam and if a BIG MONEY QUICK bit of this ashy -looking alloy be rubbed on PARKS of aluminum, nothing can be IN THEessloNNEW OOVW_QRK NGtACN NES a clean sheet seen. In several minutes, however, if the P ROF ELECTRIC (',Cabinet air be moist, a bit of activity can be seen Shop ? tEt ' taking place where the sodium amalgam REFRIGERATION o globules appear, and Special : r. was rubbed. Shiny No. 10 IC .+ from these a growth of aluminum oxide forms, often rising about an inch above the N tub; aluminum plate. The photograph shows how the oxide appears after several hours. w 29OL li. The only treatment that the plate received was cleaning with steel wool and a scratch- with Motor ing of its surface with a bit of sodium is amalgam. You ought to have this handy Parks in your shop. It is a compact, complete machine de- the 111111111111.11111 11,,,,,,,,,,,,,,,,,, signed Just like a big production outfit at one - ,o,00 lllllll fifth the cost. Includes 8 -inch circular rip and cross cut saw with polished cast -steel saw Making a large cork T table, 16 -inch band saw with tilting table for smaller-Rolling a bevel -sawing, 6 -inch Jointer, and motor oper- large cork under ating from any light socket. Just plug in and the sole of the shoe go to work) Fits in a corner of your base- will compress it so m ment. Does any kind of cabinet and joinery as to make it tit e work. Add lathe, shaper and other attach- into a small bottle. ments any time at small cost. For the man Put stiff paper on who does "odd jobs" in his off time this the floor and over Parks Is a big money maker. Turn out as the cork to keep it much as a four -man shop working by yourself. clean. Write for circular and Parks cornplete catalog of A BRILLIANT FUTURE handy woodworking machinery LEARNED IN In 3 months only-Just 90 days. you can be one of the new group of trained Machine Co. 3 MONTHS experts who will guide and develop the The Parks Woodworking must lucrative and newest of America's gigantic industries. 1553 Knowlton Street Cincinnati, Ohio You have seen the fortunes that have Canadian Factory: 208 Notre Dame East, Montreal, Can. been made by the men who got in on the EXPERTS ground floor of the automobile ... mov- NEEDED Model Ship and Clock Novelty ies ... radio. Electric Refrigeration is Electrical refrigera- going to be another tremendous money tion needs men, men, THE popularity of ship models has been nuttier for the men who get In on It and more men-with early In the game. txnitlons-big, re- increasing for the last year or so, and aponslbte, tell -paid PERSONAL manufac- open one prominent Philadelphia Another ;xeltiottscalting for them. - Appearance turer combined a loud speaker and ship Special Training ; model, which was useful, as well as being BIG -FUTURE Essentl al-Tnihits l a! is now more than ever been Opportunity metluudts cannot ' 'III the keynote of decorative. This model has further service these new J both In social andd busi- improved by the addition of a clock, which Everywhere competent men to design. machines-they need ,,ness life, Bow -Legged merchandise. and install radio equip- refrigeration experts. '. the boat. of a, hick there are and Knock -Kneed is placed in one side of the hull of rncinRADIOquallIfor ment are In t demand but a pitiful few, men and women, to wd oeau young and old, Many people have found it inconvenient lhlaopycrtnnity J' 1,bothwlllbcglad tohearthat place their speaker in a conspicuous part of by means of our complete my new appliance will and Intensive three months' radio { successfully straighten. course. Think of it! Only 90 days and ,¡' within time. you ran be earning at this fascinating I' owleggeshort wort the high salary paid experts In h l I.I 1:11 ' knuek-kneed legs. oak- this new industry'. f J;,'" 'j 4 I ly, quickly and per - " _ manently, without pain, operat on. or dim omtort. Warn at nitht. My new Home of WSOE -Lim-Strait n c" \hxlct 1.. U.S. Paten, is easy to adjust: The School of Engineering of Mil- Its results sill sae,n sate y uu from further humilation. and waukee owns and operates ratliocaat improve your ix'r1Iad apis'urance 100 per rent. (Model 18 Complete electrical 'en- station WSOE. Broadcasting, operat- glneerhog course, with Is nut like old-fashioned splints or braces, with bothersome ing, local and remote control, power straps. hard to ad}tta. but a scientific, modern device of B. S. dams in three supply, storage battery and motor- stairs. Shorter courses proven merit. used and recommended for the last 7 yews by generator equipment :all are covered by phyterims every where.) tW rite today for particulars, tool- in CommercL.l Elec- thhecourse In the must practical way by trical Engineering. and my free copyrighted physiological and anatom- means of this modern, completo, up-to- ical book which tells you how to correct bow and knock- station. Junior Electric., Eng- kneed legs without any obligation. Enclose dime for postage. date broadcasting ineering. Autommive Radio Course covers every new and Electricity. Armature M. TRILETY, SPECIALIST latest department in this fast-moving ti inding and n0 other Industry. Illustration brunches of elect rid. y 1604 L. W. U. Building Binghamton, N. Y. Mail Coupon r f .r Learn by the thorough, ap- --- proved scientific methods FLY THE METEORPLANE which our 23 years of spec- Build this plane and ializing enables us W give you. School of Engineering learn by practical expe- , \ s - rience to construct and Pi graduates requisitioned by operate Use t hegoventment to make ac- _ aircraft. `!a-` Shows !\ motorcycle engine ceptance testa on 4,000 your or student y, . Iv the IRWIN 20 hp. motor. building H.P. Diesel F.ru'1ne,di- Parts furnished very rea- , rectly connected to 1111 ` ad estt- .- s'41 sonably to build this lit- - a ' Ing radio - of 3125 K.W.. 2.300 volt tle Meteorpiane." the receiving generator. World's first light plane. .rp ai.rd sets. An - . -' ' Complete and Practical Send 93.50 for complete elementary e i. Course.-Every instructor a 1- set of blue and prints school educe- - trained man quaWlexl In practical o I parts price list of this don qualities experience. You work on modern htest Model SI -T-2. you for you will In - this equipment the same as KW vs AIRCRAr I COMPANY, Sacramento, California coarse. actual business practice. FREE BOOKLETS Don't miss this fortune -making opportunity. Let us Prove model ship speaker, with clock, is what we say. Let us send you our literature on the course You are Send for "The Nestler Plan" The new mast Interested In. It's fret-no obligation-the pennon will shown in the above photograph. These clocks briar It to you-no hags-no trouble. Be sure to mention course It will bring you Big Profits! are available in one or eight -day movements. interested In, age and education. Models. This book fully explains the amazingly successful -Photo Courtesy Miniature Ship Nero Claw, Organizing Feb. 13th-Act at Once Nestler method of servicing and retreading automobile tires. Tells how to start a profitable spare -time or full -tome Nestler business of your own. Write to the room, such as on the mantel, because of Dept. 22. occupied SCHOSILof ENGINEERING NESTLER RUBBER FUSING CO., Inc. the fact that the place was already of Mllwaukae 245 West 55th Street New York, N. Y. by a clock of some sort. This nuisance is now obviated by the introduction of the Dept SI -228R, 163 East Wells Street Milwaukee, Wi=. clock -ship model loud speaker. These speak- School of Engineering of Milwaukee, MARVEL ers may be had at various prices, according 51-228R, 161 East Wells St., Milwaukee, Wisconsin. SCIENTIFIC Send me FREE, with no obligations, more details on your LIGHTER-WINDPROOF. to the size and type of ship. Some of the course In What Makes It Lighttl! model ships have small electric lights inside of the hull and when the room is darkened, All guaranteed. Sample 25 cents Sample Gold or Silver plated. 3Iá)0 the port holes emit a glow, which produces Name Ago Dos the work of expensive Lighter+. artistic and life -like appear- an extremely Address Agents trrlte for Prtees ance. The units in the speakers reproduce City State NEW METHOD MFG. CO. radio programs with fidelity, clearness and Box S.I. 2 Bradford, Pa. good volume. Education 950 Science and Invention for February, 1928

L:: ulll'dIIIIIIIdlalitd, Readers Forum ;fllilail'.111.15:1.,11111111,41.111115l61III1hi11101111L1111111f11111111111 (Continued from page 915)

" THE STORY OF ' rooming house, and his daughter having married and is now living with a family in the poorest shack in town. She is both in CHEMISTRY rags and need. Now 1 I realize that I should have stayed at the farm and married the farmer's daughter. B.-ABENDOOTII t Boise, Idaho. (From your letter we "Scioxe." sad 1'a,mur, ^is die ,nut of believe that the fortune mseiperhy .d nations and the .nano teller told you many other things which did not d all Andress." take place, as well as those which, by coincidence, This i, the dory of the He did. Also, graphic manifold Climbed from like all of these coincidences, they nitributi.ms.. hick chemistry ha. nade 1., . - are magnified considerably after occur. that omfcr..anJ that prosperity. , ' they $1,800 to Isn't it possible that you are over -estimating 'Ike Ia,ttath.t past, the molmiunare $10,000 a Year! di..vswie, and marreb,n your ability when you say that because you did arhi

ing several rows. After one set of pictures is run through and viewed, the reader can look at the set of pictures under that one, and then go to the next (Yina one underneath, until the whole book is covered 1Sl1 Refund llourRR3cirei from the top of the page to the bottom. Then, ii more space is needed, the other side of the page FI can be used, so that the entire edge of both right- Learn* NAS hand and left-hand pages can be tilled with pictures, and the reader can turn the pages from left to right, Sedan and when finished on that side, turn the pages from right to left, viewing the other side. This process would be of great value to lmuses oR1111/105T S giving correspondence courses, as the pupil can Lie or shown, as if he were in the school himself. AItRAIIgM FRIEDMAN, ip. 11400°° New York Cstr. AVIATION (While it is true that such a system as you in cash cite would be of vast to a many MEN Someone who answers this ad will receive. interest great absolutely free, a fully equipped Do Luxe readers, particularly in demonstrating the way in WANTED Model Nash Sedan, or full value in cash if pre- 14 which internal combustion engines operate and I ego place 20 to 40 men a day. in Jobs, while ferred ($1,055.00). In addition to thia Nash the way in which the telephone receiver and tsarists., Sedan we give away, beolutely free, a latest transmitter work, you will Never bbefore eoehun- model Chevrolet Coach or Its rash value 1 note that in rapidly 3 ($505.00), a Brunswick Panatrope Phono- passing through the pages of this publication the Gat abdccl, Noce. gpeaym about graph. a Six Tube, Single Dial Freshman 19 numbers of the pages Jump all over. Now, while Biggest Radio. a Corona Portable Typewriter - each page number is practically the same dis- biddy,the Autos, .. many other valuable prises and hundreds of tance away from the edge of the book, be [ion lead World's Businesses Dollar. in Cash. . that Bag, se s. That's 8 SCIENCE AND INVENTION Magazine, or any why Greer COI- t novel which you may e a leered in World Solve This Puzzle pick up, when the book is 5 e Fields Autos, The numbers in the squares to the right spell 19 bound and trimmed, the margins are not even dp Electricity, two words. The alphabet is numbered. A is 1. Coupon brines Aviation nowpayh throughout the volume. Modern high-speed presses you ..n"ring B is 2, Cis 3, etc. Can you make out what the high-speed tarn. ,adredsof Greerr trainedd menen two words are? When you do this, send me S and book -bindery, as well as modern up to S200 a week. Here your answer right away. It may mean winning methods of high-speed folding of paper, do not Sedan or $1,400.00 in cash. a are the 3 World's great- the Nash 4 permit of perfect alignment of type on repeated est businesses. Billions pages. It, therefore, would be necessary to print -not millions, but bil- $315.00 Cash For Promptness books of this nature on very accurately registered Ilons of dollars are spent In addition to the two automobiles, the 1 plates, making the price of a magazine of the in them every year. many other valuable prises and Hundreds of nature of SCIENCE AND Dollar. in Cash, we are also offering a Special INVENTION entirely Choose one of these three Prise of 6315.00 in Cash for Promptness. First 14 too expensive for motion picture edges. It might for y vu now. prize winner will receive $1.400.00 in cash, or be of advantage for some organizations to make the Noah Sedan and 7315.00 in cash. In case of ties up small booklets demonstrating, in motion pic- wkile duplicate priem will be awarded each one tying. Get ture form, their process of manufacture, Be Greer Trained busy right away. Solve the puss1, and send me your and ma- leariciNy answer together with your name and addreet written terials, or the operation of some of their products. Greer trained men are plaids. EVERYBODY REWARDED. Current periodicals and books could hardly use needed. I have made hun- M. BOEING, Dept. 3792 the system.-EDITOR.) dreds of $10,000 a year men. 323 So. Peoria St., Cnlcage, IBe 90.000 in the last 26 years have come to AUTOMATIC Greer. CONCERTINA PLAYED WITH as% INTERCHANGE- Have You Read the 7 ABLE ROLLS big "Hints for Muslyd Entertainers wanted everywhere and earn the Mechanics" money at Moving Plcturea -Vaudevilles, Cabarets, Restaurants. Inns, Lunch Rooms. Outings. Dances, Department Weddings, Fairs, Parties, or travelling with shows all year. Entertainers clutrge 510.00 per evening. Our AUTOMATIC CONCERTINA, played with Inter- changeable Rolls, otters opportunity to make big money SEE PAGE 930 Only 3 Months . or atewly side Income. You play perfect In 30 minutes, Learn in Only 3 Months in Great Soma+, Dances. Operas, Marches. \\ altees. Fox Trots. Shops on Large Live Equip- One stetm, etc., without a taint Idea of music or notes. Send in your ideas to Greer Bonaire) tone and melodious, as played by artists, ment. I'll Pay Your Fare Here, The AUTOMATIC CONCERTINA pcgtwlses a charm, the Editor of that FREE of extra cost, then help you to which no one can escape. The player Is actuallY PIuY- I Irig, without any study or practice. AttraeUve pro- Department a Job While Learning. Then not ftaNlorual cards furnished vt lthout charge, lead to an only Fit You to get the Big Pay Job, Income for lifetime. AUTOMATIC CONCERTINAS are used in Sung and Dance Acts on the stage. Three but I'll help YOU HOLD IT. Young Models fur llame. Concerts, and Paid Entertainers. and Old, Educated and Uneducated, In- from á50.00 to 560.00. Dtscrlptive circular number have 7 walled free. experienced and Experienced Treasure Sales Company, 1690 Boston Road, New York 'found Greer Shops training Easy, BACKS OUR IONACO EXPOSÉ Fascinating and Valuable. 11140 Editor, SCIENCE AND INVENTION: Yes- ss I am a reader of SCIENCE AND INVENTION Maga. f Coupon Below zine and have been for i, os considerable time. I fail I I t' Brings You to understand why some people, as in the case j or of the person Big FREE to beautiful who addressed the editor as Bright R proportions Eyes, can still see any sense in an explanation such BOOK While you sleep` as is given by the ones who make the "magic belts." I wish to say that at least 90% of the people, mho were "cured" by this wonderful belt, rAr1ITPt nOSE ADJUSTER were ;{ Learn is SAFE, painless, comfortable. not cured because the iron in their blood was ionized, or whatever it is called, about Speedy, permanent results guar- since the troll yl amazing contained in our system is not metallic `s»fg V 1rb`1 anteed. Doctors praise it, No iron, there- II 1,f7-, fore it cannot be magnetically opportuni- Gold $ie,lat metal to harm you. Small cost. attracted, and that a + 41 is where they claim the real cure is started. Most Won 1923 Write for FREE BOOKLET B(?ORt-Ant@ of the users of the Electricitytiesineither, 273 ANITA Bldg., N. J. lonaco or any other "belt" .?, a Autos or Av- ANITA ca.. NEWARK, would be highly insulted if they were told that iation and they mere cured by auto -suggestion. This, how- I.' ever, is `tlt?,. r Greer College. the only really logical explanation, since Right now if you MUSIC YOUR there is little if any heat generated by the LESSONS HOME coil. Learn at Greer . act quick, I can There are many old people who are using contraptions these Don't let money hold make you a most un - who were bamboozled into the idea you back. Get my usual short time offer. ti that their iron was getting rusty, or some other Free Book. Find out Clip coupon now and té - fool notion and You can read music like this quickly then through high sounding words Now. howl Pay Your find out. Address me per - and adroit phrases, false testimonials. or other Fare Here, let You sonally-Erwin Greer, Pres. Write today for our FREE BOOKLET. It tells how to learn underhand means, exchanged their little savings Attend Either to ploy Piano, Organ, Violin, Slandolin, Guitar, Banjo. etc. for a worthless Beginners or advanced layers. Your only expense about bundle of wire. I have heard Days or Even- Greer Collegeg 2c per day for music and- ostage used. these agents on the street cars, where I worked, Electricity-Autoa- make such remarks fags, and help AMERICAN SCHOOL of 1St USIC,57Manhattan Bldg.,Chicago as, "Well, I put over three you find Day Aviation more in the last week," or "Had another one come or Evening 2024 CS hoWabash Avenue, hack, but I have several more good prospects." Work to Pay Chicago, Illinois Winks and wise looks accompanied these remarks YourwExpen-le - Frgom a Readir- nearly every time. seo hi Erwin Greer, President GET IDEAS However, learning. Dept. 2E, 2024 So. Wabash Avenue, culars. We it is as you say-if the Ionaco was Then when Chicago. Illinois. so good, why did the one who invented see Send know a man who reads circulars and found one it die ready Free Book indicated below and of of the things which was so easily cured? help you details of Special offer, without obliga - an idea from which he made 300 Dollars. Personally, I think Barnum was right; as for find the tion to tae. the Wichita person, he is merely real Big O Autos O Electricity ID Aviation Send 25 cents and we will send you our latest ignorant and Pay bulletins of the very latest ideas. was afraid to sign his name to his letter. Job. Name I say more potter to the best magazine in the A. S. CERVENEC SYSTEM, Box 4, Buffalo, N.Y. world; I enjoy every issue and the only thing Address [lout it that I don't like is, that it oftener. does not come THIS CLASS PIN 3Oc. " Only one more thing I want to say in regard to the lonaco agent FREE BOOK loor more, Sliver plate, Single pies sacra. choice x caos en- at Wichita, and that is, that mel,31etters,date. Sterling/Myer, It ormore soe es. Slagle he could certainly not he trusted by me let alone Plns, Rlncx, Emblem, 9 Se to pins 60e. en. Free Cat. she.. 79-s. trusting a large publishing company, with a Are., Rochester, N.Y. of copper wire. coil METAL ARTS CO., lar, 173 Portland I don't suppose you need one do 952 Science and Invention for February, 1928

you? If so, let me know, I might find some people here, who would like very much to have their money back. Thanking you, I am J. L. The Expert Staff Los Angeles, Calif. (No, Jack, we do not need an Ionaco. Before we investigated this subject, we purchased one OF at the regular price, from a recognized dealer. We knew that it was a genuine Ionaco because, RADIO as all Ionaco dealers tell us, it had the oval seal indicating its genuineness. We then ripped the cover off and removed the wrapping, after NEWS which we discovered what the apparatus con- tained, although we had a very good idea of its make-up before the investigation. Following that, we examined other apparatus Will SOLVE those and found out that the manufacturers were not even consistent in the number of turns they put in the Ionaco. If Gaylord Wilshire had survived after using t the Ionaco, we would have had another testi- Radio Problems monial letter. The unfortunate factor is that he died of the very ailments for which this horse collar was supposed to be a specific. This information has been suppressed in all Ionaco "What would I do advertising, as it would never do to let the for you l people of the United States know that the in- ventor died of one of the very ailments which if I lost my job?" his apparatus was supposed to cure.-EDITOR.) OPPOSE your employer notified you to -morrow that he didn't need you any longer? Have MENTAL DISEASES you any idea where you could get another Editor, SCIENCE AND INVENTION: position? Ilaving- had some unusual experiences with S Don't have this spectre of unemployment hanging patients, I am prompted to ask you to answer over your head forever. Train yourself to do some if possible, the following questions for which 1 'QU,jjSVvs one thing so well that your services will be in de- enclose postage. wI¡o 1. Is to effect rtr"cD CNNe4s mand. Employers don't discharge such men. They it possible for radio broadcasters co- * promote them! contact with individuals, sensory, auditory, tele- visionary, by means of metallic or other tissue, r Decide to -day that you arc going to .get the spe- inoculations, or without such inoculations, and you must have if you are ever cialized training in such degree and force as to produce reactions! job at a real salary. going to get-and keep-a real which may be termed qr construed as corn.' It is easy if you really try. mu n icát ion ? Right at home, in the odds and ends of spare time 2. \Vhat in brief is the process? that nosy go to waste, you can prepare for the 3. \Vhat literature on this subject, if any, is position you want in the work you like best. For available and where? the International Correspondence Schools will train 4. How may legally conclusive evidence of such you just as they are training thousands of other a process surreptitiously applied to an individual, what men-no matter where you live-no matter be obtained? 1 your circumstances. f Thanking you, I remain At least find out how, by, marking and mailing DR. HENRY B. SULLIVAN, ' the coupon printed below. There's no cost or, Detroit,- Mich. 50c obligation, and it takes only a moment of your time, 1. It is not possible for radio broadcasters toi but it may be the means of changing your .whole life. affect any individual or próduce any sensation, in an individual whether that sensation be audi- Mail the Coupon To -day! tory, mental, olfactory, televisionary or sensory. The human ear is not and cannot be tuned to INTERNATIONAL CORRESPONDENCE SCHOOLS such a point that it will automatically pick up "The Universal University" radio signals which travel at such high fre- 28EDITION Box 0219-E, Scranton, Penna. quencies. A detector of some kind or another Without cost or obligation, please send me a copy of is necessary. It is, coincidentally, impossible!: Lc.,f your booklet, "Who Wins and Why," and full particulart to send out these messages by any other method about the subject before which 1 have marked than radio over considerable distances and by Industrial Management DBusiness Correspondence induction over short distances. The human body, BPersonnel Management O Show Card and Sign does not react to inductive electrical fields. Greatest Traffic Management Lettering 2. Inasmuch as the system is impossible, there Buatneae Law Stenography and Typing "adiosuestiori 11°44 no Accounting and C.P.A. Clell Service can be process. & Answer Coaching Railway Mali Clerk 3. The only literature available is that found Cost Accounting Common School Subjects in books on psychopathia, as this disposition Bookkeeping French High School Subjects is undoubtedly associated with a psychopathic YOU will Secretarial Work Magazine and Book condition. need this book! It Spanish O Salesmanship Illustrator 4. Conclusive evidence could not be obtained will Advertising OCartooning fulfill your frequent of a process that is not in existence.' If such TECHNICAL AND INDUSTRIAL COURSES a process were in existence, you may rest need of expert advice. Electrical Engineer Architect assured editors of AND Electric Lighting Architects' Blueprints that the SCIENCE IN- Mechanical Engineer Contractor and Builder VENTION Magazine and RADIO NEWS, who IT is known that the Radio Mechanical Draftsman Architectural Draftsman know practically every advance in the radio field, Experts Mathine Shop Practice Concrete Builder would know of the apparatus. It further follows of RADIO NEWS have Railroad Positions Structural Engineer that such apparatus if it could be produced, combined their knowledge Gas Engine Operating Chemistry Pharmacy would immediately put all telephonic communi- and Civil Engineer O Automobile Work cation of Surveying and Mapping O Airplane Engines out business. It would prevent the experience to offer a service of Metallurgy O Mining [[]]Agriculture and Poultry establishment of radio transmitting stations. and expert advice Steam Engineering O Radio p Mathematics it would enable anybody in the United States to to everyone- listen to anyone else without the aid of appa- answering all the annoying Name ratus.-EDITOR.) questions that have so often Street Address TO MARS stumped you. Editor, SCIENCE AND INVENTION: City State There has been quite a bit of comment (some of it caustic) upon Lindbergh's recent flight to You will want to know all Occupation Paris, the flights to Hawaii, etc. 1 do not want about circuits, this or II you reside in Canada. send this coupon to the Interna- to "kick" about these record -breaking feats in that tional Correspondence Schoota Canadian, Limited, Montreal aviation, for I realize their value, but I do want method of Amplification, Bal- to make a suggestion. Millions of miles away is the red planet, Mars. ancing, Regeneration, Trans- WHITE Interest has centered in this planet since 1877, mission, Set Construction, Op- STANLEY when Schiaparelli discovered the "canali." For has taught hundreds of ladles some time, interplanetary travel has been a favor- eration, Speaker design, Con- LEARN and gentlemen to become expert ite subject for "scientific" prophets conjurers In a few weeks. and for fiction writers. Jules Verne, in his novel, trol, Electrification, Accessory The White system is recommended "Earth to MAGIC by HORACE GOLDIN, the the Moon,' used a passenger -carrying projectile. installation, Antenna possibili- Royal Illusionist. Particulars free. Recently a professor in Clark University planned THE STANLEY WHITE CORRE- to send a high-speed rocket to the moon (not pas- ties-anything and everything BY SPONDENCE SCHOOL OF MAGIC senger -carrying, 'however.) Why not use a large, passenger -carrying rocket about Radio! Deppt. 03, 4, Arington Grove, of the high-speed type, Penge, London, S. E. 20 send it to Mars, and make this dream of inter- 116 pages, large magazine size, 9x12 in. POST planetary exploration a reality? I know that this Over 200 illustrations sounds absurd in the extreme, and that there are quite a number of problems confronting such an " Bug book attempt, but this isn t any more absurd than the this dream of the airplane seemed about one hundred Wrestling Book FREE years ago. A hydraulic method of shock ,absorp- Learn etling nt home from former worlsrsworld's champions on the Newsstands FarmerBurns and Fronk Cote b. Free book tells too tion will solve one of the problems. I believe that 50c Secret holds, bl«ke tricks revealed. Be eteoog braltbe. interplanetary Iltaodle big men ravíir. write for free book. Rate age. travel is possible, and that it will come ultimately, so why not attempt it now? `S\ armer Burns Schooi 3792 Railway Bldg.,Omaha, Neb. Such an attempt will be costly, and here is an oppor- or direct tunity for some wealthy person to obtain a place in the world's "Hall of. Fame," by financing such Insure your copy reaching you each month. Sub- an expedition. By using the rocket, a return EXPERIMENTER PUB. CO., INC. scribe to SCIENCE AND INVENTION-$2.50 trip might he possible. Such an exploring trip 230 Fifth Avenue, New York City a year. Experimenter Publishing Co., Inc., 230 should be of much benefit. If 1 had tbtr means, Fifth Avenue, New York City. I would gladly finance the trip myself; however, Science and Invention for February, 1928 953

if the rocket is built and equipped as I would like to have it, I would be more than willing to The Old DEPT.K22 go inside it, even if it were necessary for me to Reliable 108 North go alone. State St., M. FRANKLIN, Credit Chi go, TI roo, Cape Girardeau, Mo. Jewelers BROS.&CO3 itI oso ÍU. (There is no doubt but that when Professor e GENUINE DIAMONDS Goddard releases his rocket and this rocket is loaded with a sufficient amount of powder to GUARANTEED propel it across the intervening space, that the CASH OR CREDIT rocket will strike the moon. There is also an r 'DIAMONDS equal possibility that we may eventually build ,.t 7: Greater Diamond Value! a large mechanism capable of sending a man ... rrti' ,? Ss to Mars. Such plans are not only within the Buy from Loftis for extra value! o "-Special offering of brilliant blue realm of our imagination, but they are also with- .' \white Diamonds at importer's price, in our constructive powers. The difficulty in such set in beautiful mountings cost of construction of a " No. -all a proposition is the I14t ^ r' 475 of solid 18-k white gold. Our direct mechanism and our decided lack of knowledge f ! .F` r -w , . * Importing and huge sales make lower of interstellar space. 850 \; prices for you. Order right from this ad of the atmosphere Of course, we know what to expect, but no ° 9 51.28! Term.: Pay one down; bal- - .. . ,e Credit -tenth man has ever travelled into these uncharted seas ,f- a ance in weekly, semi-monthly, or experimen- ,, wk. `\,l¡/// monthlyterma at your convenience. and it would require considerable ems All goods delivered on first pay- tation with land -operated devices and instruction ment. Satisfaction Guaranteed of the pilot for his return trip. 1` or Money Beck. Assuming that the Heaviside layer is a very t ry re You a Wedding good or even a perfect reflector, it would be im- Rings possible for radio waves to penetrate through No. 624 -The this layer from any place out in space. It would " Elite' lid be impossible for a person on this earth orAdventüre. I8 -k white 5~50 likewise rold to keep a telescope trained on an object as small Betwlth9Diamooda, ,, as a rocket, until such time as this rocket a22.50.6 ' Vai ]yLmends reached Mars. WU//{x2.so f - It would be far better to take the trip to the Popularity... DlamooLe,f42.50: óDlamonda S52.aOt 12 memond., 967.a0. All letfnum, moon first and then return to this earth, than With r mmm1801'9nds, 91,0: 6 Di moodn, I70; to try one of these long distant shots. The I Diamonds. f80¡ 0 Dumonda, is held within the ' it NO. .. uootamedbyDtampnd.,s2ou. moon is a larger target, Big Pay?: 27 n gravitational pull of this earth and there is a 17 Jewel Elgin No. 15 from the S75 smaller chance that a rocket released Thin Model III moon would fail to miss this earth. However, 51.75 white gold aal. 20 year tmllty '' . so that a rocket meet 12 size: sliver dtal a...tad the water area here is great pattern., 123.60. 12.56 down and chance wk. i landing in the ocean could have but slight a 3.60.month. of being recovered. Miss Ruth Elder was very THEN CHOOSE +ülW fortunate in being rescued.-EDITOR.) IS MERRITT, BEEBE? AVIATION! No. Editorr, SCIENCE AND INVENTION: maga- - /ARE you a red-blooded, 31 No.861-LadiesWrlst Watch , I wish to compliment your company on the STORIES daring he-man? Do $100 Solid ll-k white gold eses. 15 jewels. zines it publishes, particularly AMAZING L $2.50 826. 12.60 down. 52.50 . month. and SCIENCE AND INVENTION. ` `.1 you crave adventure, BIG DIAMOND CATALOG FREE! I like your series of articles on chemistry, but popularity, admiration, wk. Send for Free 132 -Pegs Catalog. Show. would like them more technical with more over 2000 amazing bargain.in Diamonds, 5 formulas. , and the a clause of great Watches end Jewelry. On request we will the article (NO MONEY DOWN) nub- I should like to inquire if A. Merritt is crowds?-1 hen why not Gift borteithlhiP any Beebe. am convinced evergrind meet toyourfreeee.minationandapprov el. nom de plume of William I . mown get into the Aviation In- it is, having read and compared some books by Beebe with others by Merritt and found the styles dustry-the greatest ad- uniform, after allowing for the fact that one was venture since time began viheai and other non-fiction. tot10 fiction, the -the greatest thrill ever ° I should also like some good books, both technical \t.+r. Play t c P EE roll and simple, on hypnotism. offered to man? xHÁ,WAIIAN HOWARD CAM PAIGNE, Think what Aviation' offers you. The praise and AWAIIAN GUITAIL ; , Chicago, Ill. plaudits of the multitude. And a chance to get in (No, Mr. A. Merritt is not the nom de plume on the ground floor where rewards will be unlimited! and, Case'.. Beebe. They are separate and dis- Aviation is growing so swiftly that one can hardly GUITAR of William keep track of astonishing new Only 4 Motions used tinct individuals. all the developments. Just as th Wavily this fascinating we do not know of any good Air -mail routes have just been extended to form a fnatroment.Oor native Unfortunately, vast aerial network over the entire U.S. Many Com- atives Hawaiian instructors y book on hypnotism which gives a modern treat- est n o `on teem ment of the subject. Nearly all of the books mercial Airlines and airplane factories are now being h organized. like Henry Ford are investing mil- how how.Everything ex- on hypnotism are filled with the stage presen- Men plsllied clraly. tation of the subject. They all speak of arm ions in the future of commercial Aviation for they Play In Half Hour Easy lessons movements and hand movements and inject dis- see its great possibilities. After you yet the four Even .f yon don't know views into the subject. Hypno- 11.4.1 motions you pia a to from another, torted religious harmonloueelwrdn tl, the 62 printed leeeons tism itself is quite simple and it does not require Become An Aviation Expert? very little practice. No end the elver pleturea erevlouamunIrniknowl- make It any to learn a multiplicity of hand movements. While these Get into this thrilling edge access's. quickly. Pay oe you pley. startle the audience, they have but little effect profession at once while Free Guitar Write at Once on the subject. Hypnotism by the bead method, the field is new and Pick Your Job! and Outfit In Genuine Seal Grain You'll never be loneeomn with method and various other ways uncrowded. Now-by a Fahrikoid Case as ..,an no you en- this beautiful llewaltan Guitar. revolving mirror roll. to Write Offer and is seldom explained in any modern publication unique new plan-you can Flying hed'ea.{erythmgNo te. A postcard do. ACT and certainly is not covered in books of ancient quickly secure the basic Airplane Instructor OTHER Tenor Bando, slobs, Tiple. Tenor Cuí tor, Ukatole. vintage or extraction.-EDITOR.) and preparatory training Airplane Enkineer COURSES Banjo Ukalelo-under well-known In.tructun. you need to get started in Airplane Repairman FIRST HAWAIIAN CONSERVATADY of MUSIC, Inc. 140 New York. N. Y. THOUGHT TRANSFERENCE the Aviation Industry at Airplane Assembler Sth Floor, Woolworth Bldg., Dept. heme, in spare time. Ex- Airplane Mechanician Approved a. a Correspondence Under the Late Editor, SCIENCE AND INVENTION: of rAe Stat School I am writing this in hopes that you will print pert, will teach you the Airplane Inspector it in the "Readers' Forum' and I hope that some secrets and fundamentals Airplane Builder of your readers will give their views on the mat- of Practical Aviation- Airplane Salesman ter. Mental telepathy is I think the name of this give you all the inside Exhibition Manager "Don't Envy the Plumber` theory. I have succeeded by years of practice in facts that are essential to Airplane Contractor ways. One your success. And, the Airplane Motor Expert I reading a person's thoughts in various BE ONE study of Aviation by this Airplane Designer 511.00-516.00 PER DAY and work EVERY day, is way is by expressions of the face; every face I wage. think remarkable method is al- the Plumber's see tells me many things. A Pierson has to most as fascinating as the Every skilled workman will tell you that Plumbers have before he can act. I can get the nature of the RUMMER the Plumber is actual work itself. the best of It. WINTER and action by a look into the face before the action ¡n/JaAYU *NW le busy at top wages. No skilled Plumber Is ever out I find is FREE with any trade, plus carried out. One of the easiest things Send for / uAvi ty of a lob-compare his opportunities a secret on his mind. e for, the opportunities of lowing your own shop. to tell when a person has Book! lit , We teach you Plumbing with TOOLS (not books) under The fact that he is trying to conceal it, makes it I.lceneed Master PLUMBERS In one of the anon show up to me. !mother thing I can do is to Send cou,ion for our new, equipped schools In America. We make you a Plumber, say something at the same time another persons free book, just out-Oppor- every branch Is taught thoroughly-Lead Work-Blue tunities In the Airplane In- does and not by coincidence either. I can tell dustry. is vitally tntereet- Print for plan reading-all other tricka. more upon sighting a strange face than upon a It previous lou. reads like a romance and LEARN TO Without friendly one, because I am a stranger and they tells you things about this IN 8 12 WEEKS ocronlshing you leas $60.00 a week you owe It are unprepared. profession you If are making than LESLIE CARPENTER, never even dreamed of. Write to Yourself to investigate. Get FREE catalog that tells for your copy today. in pictures and words how we teach this trade. Special Burlington Vt. dates now. (One can frequently see by a person's face UNIVERSAL PLUMBING SCHOOL and by his action what that person is thinking AMERICAN SCHOOL OF AVIATION 2057 Troost Ave. KANSAS CITY, MO.' about. A physician can frequently tell by the 3601 MICHIGAN AVE., Dept. 1422, CHICAGO lines on a person's face whether the person really has pain or whether he is affecting facial S 5 Section. contortion. It requires a great deal of practice AMERICAN SCHOOL OF AVIATION Miles Away/ DAY 8 -Power and communion with thousands of individuals 3601 Michigan Are., Dept. 1422, Chicago, Ill. See TRIAL ^kiss to do this work consistently. Without any obligation, please send me your FREE Book. with Big 3' ft Telescope But it is quite another matter to mention Opportunities In the Airplane Industry. Also information Brings Blatant people and objects - C things at the same time another person is think- about your Course In Practleal Aviation. close to your eyes.tWfnder r..f:k'- -Reed ing of them. We 'doubt very much If this can prone ose enwb.r.on ' teleeteop.e - Nona bro. obis e.rn'nñ 65ún` ire nt ear mile be done except coincidentally. Some day have `a ee.sr 1 e.-A Palmer. your friends take a deck of cards, shuffle them, ""'"' 8-"""'ports, a .,' O .4 ddress S. ' edeaol lQ, FREE enCASÉ pick one out of the deck and think of that card f'oi, trawl. ANO SHOULDER STRAP and see if you tan do better than 25% correct City State NO MONEY 1 guesses. The person doing this must not, how- SEND MAIL plus swots.. tt °7fi. - arrival p.r postman move his lips so as to indicate the nature : for 53.60). Or vend tt e6 end we par p.Se ever, i t d rods a , will constitute ,1 -e days. Money nfwide if not deftvÑÍ of the card drawn. This then ii CAGO,d V. a. (. t FERRY a CO., DEPT, á253 G a true test of mind reading.-EDITOR.) 954 Science and Invention for February, 1923

BOOK REVIEW

MODERN ASTRONOMY-ITS RISE AND PROGRESS, by Hector Macpher- AID for the son, M.A., Ph.D., etc. Stiff cloth covers, 44"x734", 200 pages. Published by Ox- ford University Press, New York City. Price $2.00. It is Radio ., said that when Sir Isaac Newton came Builder 31 --.zv1 into the world he was so small that he could have been put into a beer -mug. The frontispiece of the book is a beautiful portrait of the great scientist, certainly a very handsome and well You Can Play It developed adult. His treatment of gravitation eutitles him to figure at the beginning of so enter- taining a work on the latest conclusions of astron- omy. The bor'c makes excellent reading and it is interesting to find the Oxford Lniversity Press publishing the book in which American astronomers, Pickering and Lowell, for instance, are so appre iatively spoken of. Lowell's work on Mars and Dr. Chapley's work are examples of how the author looks upon the fine work of American astronomers.

CHEMISTRY IN THE WORLD'S ACONN saxophone ... new, easy in - WORK, by Harrison E. Howe, stiff cloth sanction methods ... and you play covers, 6"x8%", 244 pages. Published by tunes almost immediately! It's fun from D. Van Nostrand Co.. New York City, Price $3.00. the start, you entertain yourself and In a clear, non -technical language the author friends, win popularity, prepare for big passes rapidly front one subject to another, yet with sufficient detail to enable everyone reading money if you play professionally. thishook to marvel at the advances made in the Exclusive Conn features make easier playing -perfect scale, beautiful tone. FREE TRIAL, Easy Payments on any In February "Radio News" Conn instrument for band or orchestra. The Capitol Family Passes Its Fifth Radio Send coupon for literature and details. Birthday-By Julia Shawall The Silver -Marshall Shielded Grid Seven -By McMurdo Silver The Future of Chain Broadcasting-By Charles Magee Adams BAND Radio Control Without Wires INSTRUMENTS Effects of Broadcasting on Religion-By .1.10.1.5 uwo.s, v.,,,.u.acruaw Arthur T. Brown C. C.Conn, Ltd. 256 Conn Bldg.,Elkhart,ind l`RA The Electrified Peridyne-By Hugo Gems - Please send freelilerature and details of trial back offer on L N EW S What Happens Inside the Shielded -Grid R. Name ' Tube-By P. Clarkson St. or R. F. D. The R.E.L. All -Wave Electric Nine-By R. E. Lacault City,State,county(Instrument) Amateurs' Handbook

TO science of chemistry which are in great part re- YOU sponsible for the attainment of our present level of THE selected articles of FREE civilization. The various forms of artificial light RADIO and the part chemistry played in making them NEWS-the most possible from the crude lamps fashioned from clay modern circuits, Choose ANY to our modern incandescent lights is told so allur- with blue- ingly that even the fiction reader will enjoy it. prints, ready for $20 Musical Instrument Many of these small details entirely building- Yee..ve will give you free a 520.00 qualityViolin,TenorBanjo. the unknown to Hawaiian Guitar. Banco, Banjo -Guitar. Comet. Dada,. average reader are treated in their proper re- and a great Mnolin or Banjo -Mandolin. Learn to play by note. We lations to the rest collection of teach men,women, boys and girisbpaysy moll. Amazing new. shim of the theme. The part chem- piffled Inaba. istry plays in agriculture, cloth and radio and ent'lee onweent on FREE 7RIA L. Overor 50W,000 clothing man- aids and suggestions, eful pupils. Write today. No obligation. ufacture, decorations, health and sanitation, in CHICAGO CORRESPONDENCE SCHOOL OF MUSIC. INC. natural defense and many other branches are all all by Radio's- foremost ex- 1632 No. Halsted St. Dept. 552. Chicago. Ill. confined within the pages. The author's purpose that the book may "win a wider circle of friends perts. to the work of the chemist and to secure for him a fuller ACCESSOR! S t appreciation," will be served. This is an opportunity ! at WHOLESALE POST MORTEM, Book 1, by We offer the biggest and TubesKits, Fort-everythingt new in C. Mac - Radio at wholesale Thus. Laurin, stiff cloth of nationally ob. covers, 5"x794", 260 best edition of them all -116 Allsands andn illustrated in my Big h pages. Published by George H. Catalog and FREE Call Book. Doran 132 Faces valuable In- Co., New York City. Price pages of 1928 Radio, com- formation otlbnin $2.00. building - Radio knowledge of all kind.. In reviewing W rite today. BARRY this work the writer cannot agree plete sc,Imnn-o.nERD Mum. with with elaborate circuit AMERICA,. AUTO F. RADIO MFG. CO. some other contemporaries who are of the °opt. 274 AmarlaanP Radio Blda. opinion that the proofs expounded are not quite diagrams and illustrations It CH, Miaso..rl thorough enough. 4 This reviewer's humble opinion is that Dr. MacLaurin has not only based his and parts. Size 9 x 12 inches. findings on fact, but he has presented his facts so that there is practically no question as to the POWER UNIT truth of the findings. Substantially the book tells For large cones. Operates on "A" battery current. ,low a doctor with his modern scientific education Giles enormous volume. Most amazing tone is able to turn back the pages of history and from quality you have ever heard from any loud- those pages analyze the speaker unit. Sent C.O.D. PAY POSTMAN 512. particular ailments or If not satisfactory, return in ten days and your diseases of Anne Boleyn, Jeanne D'Arc, Emperor 50c money will be refunded. Charles V, Empress Theodora, Don John of Aus- RADIO tria, Cervantes, Philip II, Jean Paul Marat, ON ALL FANSPEAKER CO., Dept. S.I. Napoleon I, Benvenuto NEWSSTANDS 199 Fulton Street. New York Cellini, and others. He points out what it was that lay behind the strange hallucinations of the Maid of Orleans. How many or write direct to know that this girl who had changed history was just an ordinary child when she met her death and was not as stately as some of our pictures EXPERIMENTER PUB.CO.,Inc. would like to have her. How about the peculiar 230 Fifth Ave.. FOREST RANGERS case of Anne Boleyn who was beheaded or rather New York, N.Y. MEN, get Forest Ranger job; $125-$20t mo. and her husband Henry, the VIII? To say that the home furnished; hunt, fish, trap, etc. For details book is interesting and fascinating would be putting write Norton, 2650 Temple Court, Denver, Colo. it mildly. Science and Invention for February, 1928 955,

MECHANICAL APPLIANCES A N D NOVELTIES OF CONSTRUCTION, See by Gardner D. Hiscox. Sixth revised and te'RTor_Ld / r Thousands Use The . r+ ls enlarged edition. Cloth covers, 6/ by 91/2 / t1 f .'`t' -a inches, 412 pages, profusely illustrated SKINDERVIKEN .A . á+ with line drawings. Published by The . _ Norman W. Henley Publishing Co., New L `lltílitt` Z.1 - ¡ Transmitter Units York City. Price $4.00. 0. 2 . This new enlarged and revised edition of a very - ,- well-known work by Mr. Iliscox is of unqualified _ 074.2 value to inventors, engineers, draughtsmen and students of mechanics in general. The work is _1/4...d. divided into a number of sections, and each de- o- vice described is illustrated with clear drawings; -411Z where necessary a formula is given, which shows the power relations of the device given. The various sections cover mechanical power levers; o the transmission of power; devices used in meas- uring power; various forms of boilers for steam generation; explosive motor power and appliances; Taste RomanceafdAdventure hydraulic power for furnaces; air power motors for furnaces; electric power and devices; naviga- 9n the Far Lands of the Earth tion and marine appliances; various forms of gear- ing and gear motion; mill and factory appliances; perpetual motion devices of every description im- How often you've longed to see for aginable, and finally a section dealing with radio yourself the awe of Egypt's pyramids- telegraphic and telephonic apparatus and circuits. the beauties of the gorgeous Mediter- This really remarkable compendium of mechanical of China's devices should be on everyone's bookshelf, for at ranean sunset - the squalor Here's a marvel of Engineering design-a practical sometime or other you will find it very valuable ancient cities! miniature transmitter, used by thousands of radio indeed. The reviewer has .always had a copy of fans and experimenters for amplification purposes. this unusually' complete book on mechanical de- Spend a few years, or the rest of your life, tast- It is a most novel unit, having hundreds of uses. vices in his library, and would not think of being ing high adventure on the seven seas and in all Every amateur should have two or three of these am- without it. the world's great ports-roving the earth's high- plifiers in his laboratory.- . ways and byways! You can do it FREE-all your expenses paid-and earn a good salary A FEW USES FOR THESE UNITS BOYS BOOK OF EXPERIMENTS, by besides! A. Frederick Collins. Stiff cloth cover, will carry you around the _IMO SPEAKER Only one profession aETAANSMIaSICN- utl 5/" by 8", 315 pages. Published by world at will, traveling like a gentleman, but Thomas Y. Crowell Co., New York. Price that's the most interesting and pleasant work 111 / Easily and quickly _ there is-Radio Operating! learned, there's no other profession like it for Wile classified as a boys' book, the experiments the man who wants the experiences and pleasures in this well assembled collection will appeal to of world -travel. Radio operators are needed-all many adults, especially those interested in physics sea -going ships like the one shown here must and related sciences. prove serv- <5 It will especially carry from one to half a dozen or more. IhreT D+ iceable to High School teachers who wish to stimu- late independent work in their pupils. The text P.M., carries one forward in several fields of science by a series of simple experiments. Technical language has been avoided as far as possible. The first b.N.A.4.rr,L, `ilhah. chapter takes up experimenting with matter, force , ' .-cm. and time. It gives simple problems dealing with 1 F `iwc p.ux. -AMPLIriCR- liquids and gases, as well as others relating to tiAK.0 time and force. Following this are chapters on machines, showing the principle of wheels, pulleys, Ni = -RADIO AMPLIrIEn- etc.; sound, acoustics and reflection and refrac- the tion of sound waves. The next chapter takes up Take a Look Beyond Skyline heat and devices for testing both cold and heat. a Following this are chapters en light, magnetism Without PennyiExpense re. and electricity. One chapter is denoted entirely liners / 1 to radio, and another one includes chemical experi- Radio operators aboard ocean ONE STAGE ments. Front this brief outline, ore can get a live luxuriously-they rank as officers of AMPLIilC11TION- fair idea of the practical nature of this book. It the ship. Meals, a private cabin, all other will prove valuable as a supplement to classics in physics, chemistry and mathematics. living needs are furnished free, and be- 'I .. salary. a sides the operator draws a good You can learn quickly and easily at home : ! '. 1w 0¡JI. THE STORY OF CHEMISTRY, by Floyd in your spare tinte to be a Radio operator ,..'°" L. Darrow. 61/2 x 9/ inches, 528 pages, through our practical training methods. a cloth covers, profusely illustrated. Pub- Take a look at the FREE BOOK which Do....w ro ca..e lished by the Bobbs-Merrill Co., Indian- tells how-nail coupon below. -TAM,NG 1IGK7- -DETCC7OR- apolis. Price, $4.00. 4 .r, has -ODOE PRACTICING,., OEVICC- Now and then comes a book into a reviewer's This U. S. Government-recognized school ..s «w hands which makes him glad that he has that kind beer training successful operators since 1914. " of a job. Such were the feelings after reading Our graduates are all over the world. We main- 4h1I : Professor Darrow's "Story of Chemistry." When tain an Employment Department to put you on 1. 3 we were in college the hours spent in the chemistry your own ship. We furnish an automatic send- : .,my- classroom and laboratory were not always bright ing machine, a patented code teaching machine, 1:; ' ;. ones, for the simple reason that the men conducting which is recognized as the best and easiest way to learn the Radio code. A few short months, d. the course failed to give us a background of the t..-n.,-uc,o .eALDWIM PNa+C AYPl1r141-+ work we were supposed to do. We have no doubt with the aid of the famous machine and our that if such a hook as this had been given to us quick home training, and you too can be a fully 12 PAGE INSTRUCTION BOOKLET before we started the course, we would have gained qualified Radio operator, sitting in your cabin much more from the hours spent in the "Snell like the one shown above, bound out for Liver- With each unit is mailed a twe've-page instruction Hole." pool or Nagasaki! booklet, containing suggestions and diagrams for Professor Darrow starts his book properly by this innumerable uses. Read the Free Book that tells all about going back to the days of the Alchemist, and shows fascinating profession and our practical Govern- how his gropings for the Philosopher's Stone and ment -recognized methods of training you for it. the Elixir of Life really were the birth throes of Send coupon TODAY-no obligation. Special his I WE PAY $5.00 IN chemistry, as we know it today. Ile then takes tuition offer now on, includes world-famous code CASH when suffered for every new use developed for this unit readers through the days chemistry teacher free of extra cost with your course! and accepted and published -by us. its growing pains and tells of the various dis Act at once. coveries of Lavoisier, Davy Wühler, Faraday, Liebig, Pasteur, \'an't Hoff, and others, and just NATIONAL RADIO INSTITUTE what these discoveries meant to chemistry. Then comes a chapter which is really worth the WASHINGTON, D. C. SEND NO MONEY purchase price of the book-that entitled Atoms, Electrons and Protons. Down through the various Order as many as you want-use the coupon below. searchings and discoveries of Crookes, Sir J. J. OFFE When the postman delivers your order you merely Fleming, Mme. Curie, Prottt, Einstein, Langmuir, 139(130CNI. C3 GOUPOIQ 95e, a you order pay him plus few cents postage. If be unfolds in a clear and intensely interesting man- two unite you pay hint only $1.75, plus postage. ner the story of the make-up of the atom. Elec- National Radio manner Institute, trons and protons are explained in a that Dept. 2TT, Washington, D. C. PRESS GUILD, INC. S-2-28 will appeal to the layman as well as those versed 16-18-S-East 30th St., New York, N. Y. in science, because in this sub -visible universe of Gentlemen: Without obligating me in any Please mail me at once Skinderviken whirling worlds, there has been more or less mys- way send me your free book and infor- Transmitter Units, for which I will pay the postman tery, which is here explained. mation about your offer of famous code 95e. plus postage, or $1.75 plus postage if I order The chapter on Chemistry and Power contain teacher with course. two units. the most recent findings of chemists, who have de- voted years of research to the power supply prob- Name Name lems. This phase of chemistry concerns us all, as it deals with the dwindling supply of coal, and oil, Address Address and how the chemist is attacking' the problem of giving us the wherewithal to travel about without City State using our legs. 956 Science and Invention ¡or renr-uary, 1928

the contents, we may say, is of interest to every- one, for are we not all dependent to the greatest extent possible on the work of the chemist? These .Be an Accountant headings are Agriculture and War; Chemistry and Disease; Rubber; Gases; the Age of Metals the ry Twilight Realm of Matter, dealing with colloids; `Income increased over3oo7 Synthetic Chemistry; American Progress in Chem- istry, and Research, the Key to Future Progress. Here is a BOOK says Hugh Davey The entire book is up to the very last minute, as facts which occurred in the spring of 1927 are re- -OF -- corded. The average layman need not be afraid. of this work, as it is written in simple, under- HUGH J. DAVEY,Jr.,used to be a Cost standable English and gives the reader credit for Clerk. He enrolled with the Interna- having some intelligence, even though there are com- tional Accountants Society, and later be- pletely lacking al! chemical formulae, mathematical came Auditor of his Company. "I owe equations, etc., which are the bane of the ordinary my all to the International Accountants lay reader. In short, if you would like to get a good Mr. "My knowledge of what has been done in chemistry and Society," says Davey. income has would like your knowledge in sugar-coated doses, increased over 300%." read Professor Darrow's book.-G. C. B. R. HERE IS YOUR CHANCE Our 80 -page book, "How to Learn THE MOTORCAR AND ITS STORY, Accounting," tells all about the fascinat- by Charles R. Gibson, F.R.S.E. Illus- of the ing profession Accounting-what trated, 186 pages, 8 x 51/2 inches, stiff cloth work is like-what it leads to -the money that is in it- and how to get started. This covers. Published by J. E. Lippincott Co., book is free. Mail the coupon now. Philadelphia. In the present day, when we think nothing more International of seeing an airplane flying about over our heads Accountants than we do of seeing a man walking down a street, Society, Inc. it is sometimes rather difficult to think back to the .4 Division of the beginning of the nineteenth century, when "horse - ALEXANDER HAMILTON less carriages were under experimentation. The INSTITUTE automobile is such a common thing today, that we are apt to lose sight of the fact that it went through To fhelnternational Accountants Society,Inc. a period of evolution, just as flying machines are 3411 So. Michigan Ave., Chicago, Ill. doing today. Send me, free, "How to Learn Accounting," In The Motorcar and Its Story the author sketches and tell me how I can increase my income. in a brief manner how some of the first "horseless carriages" operated and how they came to be de- Name veloped. Before the internal combustion motor Street was thought of most of these forerunners of the automobile were run by steam, and even after Otto City State had developed a gas engine and it had been applied 16s to operating vehicles, steam was used on automo- biles. Most of these early cars rats on an average of 4 to 7 miles per hour. In the Paris -Rouen race in 1894 the winner, a Panhard, averaged 12 miles per hour, and it was not until 1901 that a 60 h.p. ft Panhard averaged 54 m.p.h. in the Paris -Bordeaux race. School The author attributes the backward condition of --)Hieh the early automobile in England to the laws, which prohibited horseless carriages in certain districts Based on ; Course in from g going faster than a man could walk. In fact, ,. it was required i by law to has -e a man to walk in 2 Years K front of the car carrying a red flag in his hand and This simplified, complete High School warning people that an automobile was coming. No Course-speciallyprepared for home study such laws were in force on the Continent. and so by leading professors-meets all require- ' the automobile industry developed faster there than it mentor for entrance to college, business, and did on the British Isles. Scientific leading professions. Certain portions of the hook are interesting from Fact I an historical viewpoint, but the contents are, in 200the Over 200 noted Engineers, Bus- general, of greater interest to those in mess Men and Educators helped living Great Courses prepare tfte epeclal instruction Britain than in the United States, as mention is which you need for success. No matter what made almost entirely of cars built in that country your Inclinations may be, you can'thope and which are not known to succeed without specialised training/ Let generally over here. Quite . a Every Where =sirs you the practical training you sued. good-sized portion of the book is devoted to the methods of building cars, the theory of propulsion, 25C American School energy and electrical equipment on cars. These Drexel Ave. 8 Seth Street latter Dept. H-226 Chicago subjects are rather sketchy, in that sufficient space has not been devoted to them.-G. C. B. R. Mbl a B k Wh'ei You finish It' Not Satisfied THE WORLD'S foremost - arm ,a------en------+'- American School, Dept H.226 Drexel Ave. and 513th St., Chicago ESSAYS IN POPULAR SCIENCE, by scientific write] s, such as Send me full Information oh the subject checked end how you will help me win Success In that lino. Julian Huxley. Stiff cloth covers, 6 x 9 H. G. Wells, Julian Huxley, Architect Elsetrical Engineer inches, 316 pages, illustrated. Published Cecil White and others, con- ...... Building Contractor General Education by Alfred A. Knopf, Inc., New York --Automobile Engineer Lawyer City. tribute the products of their Civil Engineer Mach. Shop Practice Price, $4.00. Structural Engineer MechaniealEnginssr The aim of this book is to arouse public interest imagination to this magazine. Business Manager ....Steam Engineer in biology and to maintain it. The author points .. C. P. A. & Auditor Sanitary & Heating out that unless the civilized societies of today im- Bookkeeper Surveyor & Mapping prove their organization and enforce adequate meas- Draftsman & Designer ...... High School Graduate ures for regulating human reproduction, and at least And they are truly AMAZ- prevent the deterioration of the quality of the racial ING STORIES created by these Hams - stock, they are doomed to decay and to be submerged in some barbarian flood. In order to achieve this. men. You will travel to lands Address man must at least consent to think scientifically and queer places never about himself and the intimate facts about his life, be- instead of surrounding every vital problem with fore disclosed to man; strange BOYS! BOYS! BOYS! prejudice. In this task, biology must he his chief it people will weave a deep te servant, and is with this aim in view that the 9/r THROW 'author has devoted chapters to the control of the fascination about you; and live stock, heredity, the inheritance of acquired char- $74 YOUR acteristics and the like. It is evident that after an experience of sheer read- reading this book, the layman will have unconsciously ing pleasure will VOICE a new be yours. into a trunk under the bed or acquired outlook on life and also an interest y,.here. Lots of Feo fooling in biology, which if ever present, was practically the Teacher, Policeman or buried and forgotten. Friendd. Get the magazine now THE VENTRILO, PLANETEN UND MENSCHEN, by Dr. from the newsdealer; it will a little instrument, fits In the mouth out H. Dekker. Stiff cloth of d._ht, uaod a lib above for Bird Calla, etc. Anyone can use IL covers, 51/2" x be 25 cents well spent. NEVER FAILS. Also a 83 PAGE BOOB; 7344", 92 pages, illustrated. Published by w -hick glees full Instructions on ventriloquism. Formula for Secret Writing [Invisible Ink], 12 Money Making Secrets fjo Kosmos, Stuttgart, Germany. gad 30 BIG TRICKS ON MAGIC an for ju This is one of the very attractive little hand- Subscription $2.50 the year ROY. NOV. CO.,'DES-rept. 717 Norwalk, Coon. books published by Kostnos of Stuttgart. It is LARGESTOLand Mail Oyler Nouee.lr Connecticut. a curious mixture of ethnology and astronomy. It treats on the subject of life on Mars, for in- stance, taking the ground that while 'this planet EXPERIMENTER PUB. CO., SQUAB rtp BOOK pp may have had inhabitants in the past, it is FREE barren of life now. Of course Dr. Lowell's 230 Fifth Ave. Breed squabs and make money. Sold by millions. canals have to figure. and in a way it may be New York, City Write at once for free 40 -page book beautifully said that it would take a German to produce so printed in colors telling how to do it. You readable a book covering the great will be surprised, PLYMOUTH ROCK 50111e CO. world or 506 H St., Melrose Highlands. Masa. "kosmos," and the little world, the microkosmos, or titan. The book will repay careful study. Science and Invention for February, 1928 957

BALLOON AND AIRSHIP GASES, by Charles deForest Chandler and Walter S. s a 6 o Diehl. Stiff cloth covers, 6 x 81,/2 inches, -_ -? a -z-L- d 226 pages, profusely illustrated. Published York by The Ronald Press Co., New City. 41 :WY' 44, Can be Price, $4.00. This book, which is but one of the volumes in ured - the Ronald Aeronautic Library, is divided into two main parts. The first part describes the production by processes used for hydrogen and helium and the compression and storage of gases, and is written by Charles deforest Chandler. The second part, de- ML- scribing the physics of gases, is by \\ alter S. Diehl. The subject matter is intended to supply informa- tion for military and commercial manufacturers en- gaged in producing balloon gases. The first part, while it deals with helium, gives a general descrip- f' / tion of the equipment with the method of production. The physical formulas needed in gas computations u BOOK part, as well as many POLK'S/REFERENCE are given in the second physical tables which should prove useful to re- and Mailing List Catalog search engineers. The text is so arranged that the as a reference hand - Gives counts and Drices on over 8.000 look may be admirably used Unlockingfor YOU different lines of business. No matter look or as a textbook in aeronautical schools. Those what your business. in this book you engaged in aeronautics of the "lighter tl'an air" type will find the number of your prospec- will find much of interest in this volume. Age -Old tive customers listed. the Valuable Information is also given as to L. how you can use the mails to secure PRESSURE AIRSHIPS, by Thomas orders and inquiries for your products Blakemore, S.B., M.S.A.E., and W. Wat- or services. ters Pagon, A.B., S.B., M.C.E. Stiff cloth Write for Your FREE Copy covers, size 6 x 8% inches, 312 pages, Secrets R. L. POLK & CO., Detroit, Mich. numerous illustrations. Published by The Largest City Directory Publishers In the W'erld York City. Price, Mailing List Compliers -Business Statistics Ronald Press Co., New Producers of Direct Mall Advertising $8.00. This volume is divided into two parts; part one, written by Thomas L. Blakemore, deals with non- rigid airships, and part two contains a description of Magic of the semi -rigid types, by W. Watters Pagon. The volume is a result of the experience gained by the authors in the U. S. Army and Navy. both during and since the World War. However, the text is not Baffling secrets of the world's greatest limited to American practices alone, various Eu- magicians-mysteries never before ropean sources of information have been drawn divulged-supernatural effects of the pY_New, Harm less, upon freely, especially regarding the semi -rigid be found useful and interest- Orient-massive stage illusions-the "YOUTHRAY" types. The book wili ickActing ing by students, aeronautical engineers, designers, most priceless, most treasured Secrets For MEN and WOMEN and others interested in pressure airships, in which of the Magic Profession now for the Not a dye or henna. Not just a darkener acts as a stiffening factor. the scalp then the gas first -disclosed to YOU in the , that colors hair down to time leaves it gray again as it grow[ out. Not l~ great Tarbell Course in Magic. Learn something you have to keep on using. - - THE GIST OF EVOLUTION, by Ho- I Entirely different. Perfectly harmless. ' to perform like a real magician in a ratio Hackett Newman, Ph.D. Stiff cloth home. Be I at Roots short time -in your spare time -at NoStreaks,NoAfter-Graying \ 154 pages. Pub- every Restores original youthful covers, 514 x 7. inches, the life of every party -the center of ¡ Apply YOUTHRAY to scalp. and social color by replenishing natural color pigment thru hair root. lished by The Macmillan Co., New York crowd, wherever you go. Business Quick results will absolutely amaze and satisfy you. a success are YOURS when you know Magic. YOUTHRAY is the true hair color City. Price, $1.50. And it's EASY with the Tarbell System! restorer. So certain, so positive are The author, in writing this book, shows that one FREE TRIAL that YOUTRRAYwitI vlease o that and in religion and can be a unconditionalditional GUARANTEE. Write can believe in God are bark It with an .nationo at The work Astonish Your Friends now tar amaelna explanation a/ and full earticulare good Christian as well as an evolutionist. our FREE TRIAL, OFFER. No obligation. Send today. has been written in a clear and concise manner, Study the first lesson and your friends will be Ray Laboratories, 646 N. M ichigan Av., Dept. 472 ,Chicago with a view toward recoucilinz evolution and re- amazed at your wonderful Magical powers, ligion, as well as giving to the layman a compre- You will have that magnetic power that gives hensive and condensed treatise on this notch dis- you instant popularity in any crowd. Every- 1 Numerous proofs and evidences of one will marvel at your apparently super- TIP WATCII' cussed subject. YOU possess this O/RECT roomr evolution are set forth so that the reader will obtain a natural, psychic power. SWITZERLAND talent nowl Surpnsingly easy to bring it out. clear outlook on evolution and glean much informa- find out facts concerning it. Send the coupon below now -and tion and interesting how easily you can do it. KLEINE ELEKTROTECHNIK FUR JUNGEN, by Harms Gunther. Stiff cloth Earn $250 to covers, 514" x 73", illustrated, 254 pages. by Franckh'sche Verlagshand- - Published Radium Dial "- Satre rofd, Cushion a Month Jeweled Movement _ _" Shaped Case $1000 lung, Stuttgart, Germany. Impromptu Tricks through Sleight of Mile fully euateotsed watch ~not be manufactured In Amen. -for we say is Child- From lane than 112. Genuine ieatbet-1Uap. AeaLrate--durable--hansomde. Again we find one whom may Hand to Great Stage Illusions -EVERY- SEND NO MONEY. Pe, on delayer, 53.95 plus Doetaae. FEDCO hood's Friend, Ilanns Gunther, really Dr. W. 1)e go Agents. 561 Broadway, Now York City Dept. W-17 THING is taught to you so that you can L5. SwNº Haas, telling all about electricity for the bene- right out and MAKE BIG MONEY WITH fit of the young. The book is very attractively MAGIC. There is a tremendous demand for illustrated with a sort of free hand effect and Magic Entertainment. Clubs, churches, CATALOG constant regard is kept to the fact that it is schools, conventions, theaters are on the designed for children. Simple battery construc- lookout for Magicians -and they pay $25 to III BUILDERS tions using electric light carbon as the case $100 for perhaps half an hour's program. Mybig192SRadioCat- e may be, then going on the batteries using plate Keep your job and make a lot of EXTRA slog, Cali Book and Trou- and all quite suggestive and naturally enough MONEY on the side. Just master a few ble I. alder. 132 pages about all the more or less old fashioned types of bat- easy tricks. Salesmen -business men -pro- Radio. Chock full of newest cir- teries are given. fessional men -all can use Magic to gain cuits -kits, transmitter parta, short Easy for YOU to wave outflte. eliminators and speakers. popularity and profits. Thou d f taryatn at low rut wholele,a prices. VOM SANDKORN ZUM KRISTALL- make $250 to $1000 a month 1 A re,vlar Radio EncycEncyclopedia -ins*. Write today. , American Auto 8 Radio Mfg. Co. GEFASS, by C. J. Stahl. Stiff cloth naaaY liC11wARTla1010. Phre. 76 Special Limited Offer! Dupl. 275 emennn Radio Bids., City, Mn. covers, 5?4" x 73", illustrated, pages. Published by Dieck & Co., Stuttgart. Germany. Mail Coupon! This interesting little book traces the path of You can now get this great course, endorsed silica from the sand bank to the glass works by the world's greatest magicians, at a CHEMISTS have to act quickly where ttiade into a suitable "batch' with lime special low price. But you be is SUREI Our new catalog, listing 5,000 and soda or potash as the case may it to get in on this offer. Write today incited down to the beautiful transparent glass Y Chemicals, 2,500 f Iustrations, Lab- which really should always be an object of Inc., 14-2Z , oratory Apparatus and 1,000 books; adn:iration. Considering that the scientific mind Tarbell System Studio 111. sent on receipt of 50c. that outgrows the faculty of being surprised at 1920 Sunnyside Avery le, Chicago, the most every day achievement of the mechani- a enormous sheet LABORATORY MATERIALS CO. cal arts is taking back step, an Tarbell System, Inc., Studio 14.22 U.S.A. of plate glass such as we sec in the store win- 635 East 71st St., Chicago, dows absolutely transparent without the sug- 1920 Sunnyside Avenue. Chicago, 111. gestion of tint of color about it is a true miracle Please send me your big FREE Illustrated and colored feels in looking at this little booklet giving full information on the Tarbell System of technology. One on my part whatever. . I Positively Guarantee manual that the pity is that it h not longer. of Magic. No obligation to Increase your arms ono -half loch In size, chest one full inch. strength LAMPES; A ELEC- 25%. health. l0070 In one week's LES PLUSIEURS Name time. by following my instructions TRODES ET LEURS APPLICA- and using my exerciser 10 minutes 10", mornings and at night. Send $1 for TIONS. Stiff cloth covers, 6%" x Addreee complete course and exercisers. sat- 326 pages, illustrated. Published by Eti- isfaction guaranteed or S1 refunded. France. PROF. J. A. DRYER enne Chiron, Paris, City and State This book is a translation into French from Box 1850-C Chicago, Ill. the Polish. A few words of introduction by 958 Science and Invention for February, 1928

Professor Pozaryski says that in Poland where the Radio industry is starting the scientists were about to avail themselves of all that other peoples had accomplished up to date. The pres- ent book uses the mathematical developments of the subject to the fullest extent, giving numer- ous equations in calculus, so that to really get the good out of it, one must be a finished mathe- matician. It has numerous illustrations in the shape of diagrams and a very full set of biog- raphies are given as an appendix and a full table of contents may be supposed to take the place of an index. When we consider that there are very nearly 150 conventional signs given in a preliminary list the extent of the book may be imagined. ! r'f PREHISTORIC MAN, by Keith Hender- son. Stiff cloth covers, 6 x 8 inches, 272 pages, 102 illustrations. Published by "Four Raises in E. P. Dutton & Co., New York City. Price, $3.00. In a vivid and picturesque style, the author Two Years" tells the story of man's ascent through the pre- "AND it hasn't been hard to get them, either. Why, historic ages. Nothing more fascinating or inter- it seems only yesterday that I was wondering if I esting has been written about the cave dwellers, would ever make as much as $45 a week. And now the beginnings of tribal customs, dress, and be- I'm making $75. liefs. The text is further enriched by a number "Torn Dawson was speaking about it today. 'Gee,' of unusual illustrations. As one turns the pages he said, 'I wish I had started studying with the lie takes a delightful educational journey into I. C. S. when you did. Here I am plugging away man's prehistoric past. The book is thoroughly at the same old job and the same old salary while informative without being too technical, and is of IDA C. BAILEY ALLEN you've gone 'way up. I bet you're making twice as ready reference for popular education, as well as much as I am. And to think that two years ago of genuine literary worth. we were working side by side.' "I told him it wasn't too late if he would only make the start and he said he was going to send in NE\V METHODS IN GEOMETRICAL one of those I. C. S. coupons right away. OPTICS, by Charles S. Hastings, stiff For the "I hope he does, because an I. C. S. course is the cloth covers, 512"x8", 103 pages, published very thing he needs to get out of the rut. I wouldn't by the Macmillan be making anywhere near $75 a week if I hadn't Co., New York City. started to study just when I did." Price $2.00. The text, which is a physical work, replaces the data ordinarily employed in shop and calculating optical sys- Housewife Every day. In office. factory, you will find tems men who are being given better positions and larger by real entities, such as, wave surfaces, wave salaries because they are studying at home In spare limo velocities, and surface curvatures. The designer of with the International Correspondence Schools. an optical system often lacks a means whereby An I. C. 8. course helped Jesse G. Vincent to rise errors in color correction, or any zonal difference IDA BAILEY ALLEN'S from tool-maker to Vice-president of the Packard Motor of focal distance may be corrected. Lt this book Car Company. It helped George Grleble to rise from the fundamental equations of optics have been re- a stone -mason to the owner of a business paying $12.000 placed by quantities a year. It helped Bert S. Rematey to increase his salary which can be defined either in ten tines. And it will help you too, if you will only place or in time. Thus the fundamental equations COOK BOOK make the start. are greatly simplified, their derivatives are easily found, and the labor required in designing a lens Mail the Coupon for Free Booklet system is reduced considerably. In this book a new method in optics is presented, with special attention INTERNATIONAL CORRESPONDENCE SCHOOLS given to the design of centered opticiJ systems. The Special Price "The Universal f'nirersity" advantages accompanying the use of readily deduced Box 6220E, Scranton, Penna. derivative equations are clear to the mathematician Without cost or obligation. please send me n ropy of and should certainly recommend themselves in actual your booklet, "Who Wins and Why," and full particulars practice. .98 about the subject before uhlch 1 have marked N: $1 (]Industrial Management Business Correspondence Personnel Management Show Card and Sign Traffic ManagementLettering ISOSTASY, by \Villiam Bowie, stiff cloth Business Law El Stenography and Typing covers. 5.4"x8%", 275 pages, illustrated, Accounting and C.P.A. O Cis11 Service REGULAR PRICE, $2.25 Coaching Railway Mall Clerk published by E. P. Dutton & Co., New Cost Accounting Common School Subjects York Subjects City. Price $5.00. Bookkeeping French nigh School In writing this brook the author has Secretarial Work Magazine and Book considered THIS foremost expert of Domestic J Spanish Salesmanship Illustrator the two views on Isostasy. tine holds that the Advertising Cartooning earth's crust extends to a certain depth below sea Science discusses freely on cook- TECHNICAL AND INDUSTRIAL COURSES level, and the other, that crustal matter has uni- ing and the menu, incorporating Electrical Engineer pArchitect form density with varying thickness. The writer into this one volume all knowl- Electric Lighting Architects' Blueprints is convinced from his stitches that the former theory the Mechanical Engineer Contractor and Builder is the more logical. The Pratt theory is used in edge and experience of many years' Draftsman o Architectural Draftsman applying isostasy to the consideration of the earth's 0Mechanical flee Builder experiment. p Concrete crust and the processes which canse horizontal and Railroad Posine itions Structural Engineer Gas Engine Operating Chemistry Pharmacy vertical movements on the surface. The great mass Civil Engineer Automobile Work of literature dealing with isostasy is enormous, and Surveying and Mapping Airplane Engines has been presenter) in a comprehensive form in this 2500 Recipes Metallurgy O Mining Agriculture and Poultry text. The book should be exceedingly valuable to Steam Engineering Radio Mathematics O petroleum and mining engineers, professors of geol- 1001 Pages ogy, and students who are interested in this sub- Name ject. This is a valuable book, and an Street Address important factor in the conduct of City State THE ROMANCE OF TILE ATOM, by a household. Benjamin Harrow, stiff cloth covers. 5%"x Occupation 7A", 162 pages, published by Botti & You will find such topics as you reside fn Canada. send Ms conpnn to the Interna- these, by this international author- tional Correspondence Schools Canadian, Limited, Montreal Liveright, New York City. Price $1.50. This hook describes in non -technical language the ity, w ill lend a much needed helping achievements of chemists and physicists in solving hand: Purchase of Foods, Dieting, some of the deep mysteries which are hidden within Feeding of Children, WANTED MEN the atom. Much of the mystery within us and Vegetarian To Make Metal Toys and Novelties surrounding us can be explained with the help of Menus, Seasoning, Table Settings, A NEW BUSINESS in America these atoms. The text deals mainly with the atomic Using Left-overs, Feeding the Sick, otrera you great chance for Big inner structure, tracing the story from the time Foreign Dishes, Church and Profits. As our Represent at ice of alchemy tip to the present day. The concluding Club you will do Big Business making Suppers, Outdoor Meals, Canning, Toys. Novelties, 5 and 10e Store chapters in the hook deal with the origin of life, Specialties, Auto Radiator Orna- and the application of science to our present every etc. ments. etc. We co-operate In sell- day existence. ing goods you make. also buy them from you. An opportunity of a lifetime for the right ratan to connect Use This Coupon with n firm of many years' standing. Small investment pins you on road to urcess. WE FURNISH COM- THE STORY OF THE ATOM, by W. PLETE OUTFITS ,1ND START YOU IN N1:1,l.- P.AYING BUSINESS. NO experience ne'eskary. ACT F. F. Shearcroft, stiff cloth covers, 5"x CONSRAD CO., Inc.. QUICKLY If you want to handle Big 1920 Wholesale 7',4.", 77 pages, by 230 Fifth Ave., New York, N. Y. Business and orders now being Placed Write AT published Greenberg, ONCE for free catalog and information. Gentlemen: I enclose 51.98: please send me Publishers, New York City. Price $1.25. one copy of Ida Bailey 11Ien's COOK BOOK. METAL CAST PRODUCTS CO. The story of the atom has been written from the Dept. E, 1696 Boston Road New York popular standpoint, and is an exposition of this fascinating subject for the non -technical reader- The NAME book is plainly written and will be read with 'BECOME A LIGHTNÍÑG pleasure and trofit by the layman. The atomic TRICK CARTOONIST" theory, the molecule, radio activity, and disintegra- ADDRESS tion are explained in simple language devoid of all Send 51.00 for Beginners' Instructions with technicalities. The hook is but one of a science 7 laugh producing program of 23 comic trick CITY drawings. Catalog of Chalk Talk supplies free. series written in popular style for a non -technical BALDA ART SERVICE.. Dept. 4. Oshkosh, Wisconsin public. Science and Invention for Febri.wry, 1928 959

25,000,,000 AUTO 0WNEI J VOLT -AMMETER Need This W Device 1.1k4-11 L-9.1 Mt ELECTRICITY 01 -. [ Success / A n tn 11;Je engineers ra chtlm that 95 ,-ylyL111 per ant encr- .,y¡ g3' in gasodne o to Is wasted. Think of the sales ptalbbIlles In C offering the new Whirlwind Carburetor del Ice tTrAMMfrC i when you can show car owners It saves Its tun WH1CIIf WAY every few weeks In gas saving alone. WILL 50 MILES ON A GALLON OF GAS in actual tests. Owmts also report more ; YOU power, quick starling, instant pick-up, and disappearance of carbon. co GET TERRITORY QUICK Tien are now being appointed In each locality to take care of the tremendous demand. Terri- tory is going fast. Our men easily can make AGO &5,000 to 38.000; yes, even 510,000a year. Spare SIDETRACK workers more daily. 40 ro MOAFRNt time make 320 and even WHERE Ac A Whirlwind Gas Saver Is provided our E v SUCCESS workers free to enable them to equip their YOU ARE own car or carry for demonstration tem- SIDETRACK ro . pests. Send your name today for this \ ` fAAR .VYING and our won - SIDETRACK free sample NOW S /oEneACK 1R EE SAMP LE derful money -making offer. rr ro rarWRA 70 MEfYDCq/rr WHIRLWIND CARBURETOR COMPANY A brilliant future with big pay awaits you in two new 999-171 E. Third Street Milwaukee, Wisconsin branches of electricity-Electric Refrigeration and Radio.

Above is a view of a new combination volt Ina 3 months the ye p days you and ammeter which has recently been devel- can bert one of the new group EARN UPT0,1250r>PfgthSALARY_ oped. The instrument has four terminals, 3 MONTHS experts who will guide and develop the of America's gigantic Industries. as a Railway Traffic Inspector two at the bottom and two at the top, which meet lucrative and newest -- For nine years, our graduates have enable it to be connected as a voltmeter or Everywhere competent men to merrllandise. Install and service been offered positions as Trame In- ammeter. An adjusting knob is placed on Electric Refrigeration and Radio Equipment are In great de- ! spectors at definite salaries, plus ex- top of meter in order to correct any in- mand and are earning big pay. Now you can qualify for this penses, after the opportunity by means of our complete and Intensive three Traffic Insspecctorssslssttarrtt accuracies of the pointer. months, practical laboratory nurses. Think of It. Only 90 at $120 or more per month and rise -Photo Courtesy Roller -Smith Co. days and you ran be earning at this fascinating work the high rapidly to 5175. 5200, or ír250 per salaries paid experts In a new Industry. month. As a Railway Traffic Inspctor, you are NEW SQUEEZER ..1,.tr practically your own bees, see new face ORANGE Complete, Practical and places each minute report only to high officials, are rapidly advanced. It's healthful. outdoor work, with regu- ELECTRICAL EDUCATION lar hours. Hundreds of Satisfied Graduates Write today for booklet D-27, giving full details and con- Learn t0' the thorough, approved scientific methods which our tract agreeing to refund your money if position Is not 2:1 years of specializing enables us to give you. Complete Elec- offered after graduation. trical Engineering Courses with B. S. degree In 3 years. Shorter STANDARD BUSINESS TRAINING INSTITUTE nurses in Commercial Electrical Engineering, Junior Electrical Div. 27, Buffalo, New York Engineering. Automotive Electricity, Armature Winding. A. C. and D. C. Motors. and all other branches of Electricity. r`^I 1AKES A COMPLETE MACHINESHOP CYST -USE ELECTRIC MOTOR ATTACHMENT Also Home Experts Ze,, Facto. r h.h Study Needed V Trained mechanics can in If. you are unable to .f oalltor come to Milwaukee- not service these new the Electrical center of machines of Radio and , attachment* Inc Grind- America-tor your Refrigeration. Special i. ing, 1bli.hpns' Seeing. Driilins. to. training, we will teach MADE TO FIT 3 Lindy /2-InrA d 5¡a.inrh haft... State else. New, training is essential. SPECIAL BARGAINS -NEW ELECTRIC MOTORS you al home. Experts are pitifully 1-e II. P. 1751 R. P. M. 32 Volt D. C. General Electric .... $10.50 easy tray with complete 1.4 II. P. 1151 R P. SI. 32 Volt D.C. General Electric . 14.75 equipment few and the demand is Electric 12.00 laboratory 1.4 1'. I'. 1751 It. P. 111.110 Volt 50 Cycle A.C. Day -Fan starts you on the road for men, men and 1-2 p, P.1750 n P. 51.110-220 Volt 00 Cycle A. C. Day -Fan EI«trie 29,75 to become an expert more men with big re- Write al your motor Requirement, for other bargains F.lertrotechnlclun. sponsibilftles; well paid UNITED ELECTRIC MOTOR CO.. 178.ga Centre St.. N. Y. Write today for full 4,l particulars of course positions, open-wait- you are Interested in. ing.

COME A PHOTOGRAPFILR' FREE BOOKLETS t "dscirfafinq Work- PAY Learn Quickly - BIG Don't miss this fortune-makig opportunity. Let us prove ¡- 1' ;1., Earn $50 to $250 Weekly ....at ire say. Let us send you our literature on the course you are most Intersted In. It's free-no obligation-the er,upon w91 Write for Free Fascinating Illustrated bring It to you-no fuss-no trouble. Be sure to mention course Book. Tells how you can become a suc- education. cessful Movie Photographer, Portrait. Interested In, age and Commercial orNews Photogr.pher. Learn In your spare time at home or at our New New Class Organizing Fel. 13-Act at Once York studies. Free Employment Service. N.Y. INSTITUTE o1 PHOTOGRAPHY ; INEERIN 10 West 33rd St., New York, Dept. 8?. 5:cH - ta. a MilwatlLcee G Above is a new orange or lemon squeezer shown at the Annual Food TELEVISION which was recently FoOoded 1905. Owns and operate» Radio Stations WSOE and 9S0 Specially prepared 18" discs with Show in Los Angeles. The device is cranked.. O holes drilled on spiral: also holes by hand and is said to be extremely efficient. Dept. 5.1.228, Jackson & East Wells St., Milwaukee, Wis. In center for a," or 4" shaft, ready The receptacle for the oranges Is made of for mounting. white china, and the squeezer is mounted 'MAIL COUPON NOW Aluminum 510.00. Fibre 55.50 upon a metal base. Per Pair SCHOOL OF ENGINEERING OF MILWAUKEE Dept. S.I. 228. Jackson and E. Wells Sta., All other apparatus for Television Wis. Experiments supplied. Milwaukee, "PUSH-BUTTON" CABLE Please send me, without coat or obligation, full particulars POHL BROTHERS of the electrical course I have checked, and your big Free 3541 Michigan Av., Detroit. Web Book telling about your Institution and how It will fit me for a big position In the electrical field. Also tell me about your Earn-While -You -Learn Plan. WholesaleRaadioeatalO (N sure to check courses Interested In) ....Electrical Engineering. B. S. Degree In 3 Years. FREE ....Commercial Electrical Engineering, 1 Year. dealer -Set Builders! Save Money! ..Junior Electrical Engineering, 1 to 2 Years. Send for this book of bargains. Everything ....Master Electrician, S Months. ID Radio-all the newest hook-ups. Sete. .... A.C. and D.C. Armature Winding, 3 Months. kits, parts, cabinets, consoles and sup- ....Light, Motor Wiring and Testing, 3 Months. plies. If you want the-best for the least ....Automotive Electricity, 3 Months. money, you need .this catalog. ....Refrigeration, 3 Months. ....Radio Safes and Service, 3 Months. t SHURE RADIO COMPANY - ....Home Study Laboratory Service. g34SX West Madison St. CMean:OIL .... Ian interested In yourEarn-While-You-Learn" Plan.

cable for Name Age §Be -a. Tire Surgeon-Make -$7500 Yearly A new kind of electric carrying small currents has recently been invented in Easy to make Big Money with Ray woods new Tire Machine Berlin. It is a system of wire:; woven in a Address and latest surgery methods. No experience necessary. We separated by an elastic lessons. BE YOUR OWN loose braid and is teach you FREE - 18 complete which permits a contact to .. a money non-conductor, Stair ...... BOSS! Don't work for somebody else. Be real by pinching City maker. Get the fasts how others arena king big money. Write be made at any point, merely for FREE Book. "Steps to SOccesa no obligation. cable. This invention abolishes the TODAY As.. Chicago the .. .. MAYWOOD TIRE EQUIPMENT CO.. 1312 s. Oraley necessity of push -buttons at set points. Education 9W Science and Invention for February, 1928 Test at Our Expense! Home Broadcasting-A New 100 Imported Pleasure 8s Cigarktioronhi (Continued front page 917) Full 5 -Inch PERFECTO is to be perNundred shown to its best advantage. If an Size artist learns to vary the distance between "ROSE MARIE PERFECTOS" are hand-made-in model himself and the microphone, or inclines sanitary factories-of the selected long fillers-grown in the head slightly out of line, will no celebrated Cagayan Valley. They are mild-free, even - there be burning, and produce a pleasing flavor and aroma. blasting on the phrases which are to be stressed. This, of course, is taken care of ( How Can It Be Done? at the present time by the operator at the is a natural question, but explanations are simple. Owing control board of the transmitter; but unless to low living costs in the Philippines, the manufacturers he is familiar with the music to be sung or can afford to sell "Rose Marie Perfectos" at about one- played, third of what we would llave to pay elsewhere for like there will be some blasting. Now. quality. \Ve import direct and sell smokers al half the however, with the aid of this device, the established retail price. But by buying by the too, you home critic can advise the save half on your smoking expenses. Fresh stock is received performer. every two weeks in air -tight boxes, as tWieft.MODELS ;- ' well as in protected cases. Imagine the amazement when one walks »ce No into the room, in which is better cigar can be found, retailing at even :5 cents placed an ordinary RUDY WIWOEFT-wizard each. If import duties were imposed you would have to pay broadcast receiver reproducing with utmost 25 cents each, at retail. Your first too order will cost us fidelity the strains of a dance ofthesaxophoiie,composa .. about 3 times our profit. We make our profits on the number which frequent and continuous repeat orders. Order zoo Rose the announcer says is coining front station er;'radió;, stage; concert Marie Perfectos NOW. 2L0, London, England. A very clever stunt hall and record star. Frank' is that of cutting the microphone into the Smoke 10 On Us circuit an instant before a regular broad- Holton, master builder. with an open mind. If you are not delighted, return the casting station is to make its announcement. of band instruments. other oo and get your $.1.00 back-without question or equivocation. A suitable announcement can thus be made before These two dreamed a When ordering, add 25C postage if East of Pittsburgh. the regular announcement and the If West, add 40c. Or will send C. O. D. switch thrown, again cutting in the regular 1 `Iii dream of a super -sago' radio broadcasting station. phone. Their genius ful- NATIONAL CIGAR COMPANY filled it. The new Importers of Cagayan Valley Cigars By a strange twist, this instrument per- vC Holtons Dept. 16 B, 969 Broadway Brooklyn, N. Y. mits reversing, that is, if there is a conver- in the ,Wiedoéft. Model sation in the room in which the radio re- are as outstanding in tone, ceiver is placed, the speaker of the set will tune; ease of playing ,and pick up and transfer this speech to the room TENYOLUME where the "broadcaster" is located. Numer- l lightning response as-Ríldy- Dl RECT ous possibilities are thus suggested to the Wiedoeft's artistry itself. "broadcaster." Numbers can be requested to Free '_FROM be played by the radio ten day loan. Write - receiver and the . for Application Blank. - NATIONS astounding part of it all is that the receiver .F CAP _TAL will usually comply with the request. The ' FRANKHOLtON & COMPANY.:, home broadcaster is again at the bottom of ° .326 dumb. fit, Elk horn Wis. Now I Alibrary In magazine form delivered postpaid to your borne from the Nation's this trickery and either sings into the micro- Capital. It's the "Pathfinder"! Published phone or plays the selection upon a phono- every week of the year. 01 interest to the entire family. Interesting I Instructive% graph in some distant room. \Vitl1 this de- Gives the N. orld's Intent doings.oin .. Ce tains valuableInformation Incluing meekly en- vice the home broadcaster should have no of events. net rtmy well criopeia/moon authors innsingle Issue worth thep difficulty in fooling his friends during a nyensubscription. Lots young old Interestingresting icturer. pleasant evening of varied amusement. An- nd many 'otherd freto, es make the Path- finder the choice of one million families. other novel experiment is using the device You w ill keep every copy as reference. Fora limited tome onir.to interest new to reproduce telephone conversations over friends. we will send the next 10 issues for 1Oe. Scud a dime. name and the loud speaker of the radio set. A address today! PATHFINDER, switch Dep. MX2, Washington. D. C. is used to cut the speaker in or out of the -14ÁÍ LA: ME TODY, i` circuit, as the case may be. The device besides' bfultitude, of. pecosa, with defeciive Itearint and Fled proving to be an Noise' enjoy conversation,go to Thea- amusement in the home should also be a treandChurch because they useLeonard great help to those having youngsters. In Invisible Antiseptic Ear Drums. Tiny HOLESALE Megaphones fitting in the Ear entirely RAVbO,'_ order to get them to bed early, or behave out of sight. Ndwires, batteriesor Write for my Big 1928 Radio Catalog properly, bead are Unseen Com- -just off the broadcaster can adjoin to an piece. The) the press... Thousands adjacent room and imitate forts and inexpeesfrr. Write for Ire a of marvelous bargains in nation- the Sandman, booklet and aworastatemratelthe regular ally advertised goods. All the Santa Claus and any other fairy tale char- anreator who tar himself deaf. encyclope- LATEST IN RADIOS and acter which may have impressed itself upon dia on Radio. equipment. Lowest whole- All abou I trouble finding. sale prices. the juvenile mind. FREE Log and Agents LEARN WATCH REPAIRING Call Rook and Wanted. The broadcasting unit may also serve prac- You can learn by our modern and orig- Cat- inal system of Instruction every part of alog. Get your copy to- tically in the business world by using it for the Watch Repairing Trade at home day. Send postcard nowt inter -departmental communication, whereby WS good or better than at a shop. You American Auto & Radio Mfg. Co. can earn money x hire learning and toe - «ARM' aCsRuda Purr. the head of a firm will be able to talk to cure a well pay,ng pest ion cr start In 0ep1. 273 Asterism. Radio Bids.,Bids1.., llamas City. NIL 3 any business after completing our course of one of his subordinates. This would instruction. Good watch repairers are necessitate, however, the use of a switching always in demand and earn from S50 to S75 per week. For partloil ars Single Acting High Speed system which would cut in on the particular apply to Model Steam Engine THE MILWAUKEE SCHOOL OF WATCH REPAIRING line wanted. Engineers who are now work- 166 Mason Street Milwaukee, Wis. Type Q. Stationary -1 in. bore ing 1 14 bait Broke. Weight, 8 on this idea say that the main difficulties cos. 8 Ora. Price complete, have been overcome and that it will soon be 817.00, forwarded prepaid WADE BENCH LATHE Many other types model En - put to use in this manner. ,q glace. Boilers. Boiler 1.7ttlnbs Catalogue 20e. (refunded an Cup: 4' dla. x 12' lebgth- on first oilier.) The simple device - lS!y! y Sllderest has tmeel en- which will supply all of _. / i .f tire length of bed Bathe Mfg. Co., Dept. 2-5114 Woodland Phila., the pleasure and entertainment as \ Ase., Pa. outlined, ís Hollow spindle. 71trn- not costly .ry and consists of an adapter which se - ing. tael1. Isoring. is plugged into the lIY flrllltng, wlad ng.thread- detector socket, with a cutting. No. 1 Lathe plain headstock 525.00. No. 2 Lathe switch to cult the microphone in or out of back -geared headstock 555.00. Either ¡Abe 4'xtl' 37.00 the extra. Complete line of accessories. Catalog sent free, COMICS! circuit. The signal is amplified by the The Gerold Co.. Dept. S-29, 120 Liberty St., New York 10 easy, interesting lessons audio system employed in the radio receiver, Full of fascinating instruction and is then reproduced by the loudspeaker. spend Simi, Somme. Fai taihn.. a2 FEMALE There are no external connections he iag)wnnfies, insets. I but hundredsd Lmds COMPLETE COURSES to WHYNOT at Sent to you postpaid for-' made to the home broadcasting outfit, and its to rdtriau. Some .odh SI to $7. Simple uork oil, my Instrun vent rug tore -.- rions.pklwes.pRekst. Send Ilk NOT STAMPS] to no Prospectus aaevLAR (ea -owl installation and operation are extremely CAR1.c5ON CARTOON [SERVICE Wore undin% bulterflies. Mr. Sincl air, Dealer in In- simple. fects. Dept. San Dept, T 116 West 39-51 lfewYork 41 Box 1424, Diego, Calif. Science and Invention for February, 1928 961

S. & I. 3 -Tube A.C.-D.C. Set By PAUL WELKER LEARN (Continued front page 919 Sheets of Cards OF THE RECEIVER RADIO or Visible Records OPERATION Itandifax-A wonderful This three -tube set is simple and flexible and find Invention-I le!Is busi- in operation, most of the tuning being done neAs. Visualizes farts Pay from the Start, to executives. SO Card- with the variable condenser. Regeneration Good eheets show 1000 rarcis is controlled by the small knob on the left Rapid Advancement and Visible space on each hand side of the panel, which regulates the \curd y4 or l In. Easy Success in to analyze. position of the tickler in the small three - Phenomenal Color signals "nag" circuit tuner. Tile set will be found to de- A Life Profession of / your attention. Cuts liver excellent volume, in fact, it may even Brain -work. rcrord-keeping roars be too loud for a small room when a power Fascinating 40;,. Quick for use fact, a In reference or post- tube is employed. In view of this You Can Learn At Home ! ing. variable resistance has been placed across is big oppor- all of A.F. Here your Good for kinds the secondary of the last transformer. graduates records. Any size-100-- This serves as a volume control and will tunity! Our 1.000- 10,000- 1,000. - big money if a power tube is used are earning BiRi-irdur present, system he found necessary as radio designers, as can be used. Very low cost in the last stage. Even in congested dis- executives, in -very compact. tricts. the receiver will tune sharply enough radio Send broadcasting work, as for Free ROSS-GOULD CO. so that no more than one station is re- skilled service men and Samples 404 N. 10th St., St. Louis, Mo. ceived at a time. The set as it stands on radio dealers. We have this page has been built for storage battery R. L. DUNCAN. trained thousands to operation, but can he easily changed over Director, R. I. A. become successful ra- so that the new A.C. tubes may be em- dio operators on ships and in shore sta- ployed. Those who do not wish to make tions. And now opportunity is knocking an A.C. operated set at the present time at your door. Are you going to plod along may find it advisable to build this receiver at a thirty-five dollar a week job when and then change it over at a later date, REAL MONEY is waiting for you in radio? { according to the instructions which will be published in the next issue of this magazine. A Brand New Course Learn in Los Angeles With three -tube A.C. set it is not necessary ,Be an electrical specialist? Gain quick success .in this most to use an outside antenna, as the electric fascinating and profitable field. Learn at National In the t Thus we center of tremendous electrical projects costing more than light line is used for the aerial. $100,000,000.00- unlimited opportunities nose. have an ideal set which is simple in opera- Practical, intensive training by National's job-experience tion, economical ill current consumption and method in 6 to 9 months. All technical essentials included. of great appeal to the apartment house School endorsed by leaders in electrical industry. You learn all branches of electricity; radio. Million dollar institution; dweller. all modern equipment and training facil- ides. Life scholarship. No age limit. Free employment service. Over 17,000 success. ful graduates. 23rd year. Big, illustrated 84 -page catalog sent FREE. Write today. O NATIONAL EILECTAICALSCAOOL Dept. 280 4006 So. Iigueroa, LOS ANGELES, CALIF.

HOW ro OBTAIN .1 o After years of experi- A Perfect Looking Nose ence the Radio Insti- My latest improved Model 25 corrects tute of America has now III -shaped nose, iluirkly. Pain- lessly. permanently and comfortably at The above photograph shows a bottom view of evolved a new radio home. It Is the only noseshaping an- .the set. The placement of the cable and course-the most up- Pllaneo of precise adjustment and o may be seen. safe and guaranteed patent derive that speaker filter condenser to-date of any offered will actually give you a perfect hinting nose. write for free booklet which tells LIST OF PARTS today. All this first- you haw to obtain a perfect looking quality equipment for nose. 51. Trllety. Pioneer Noseshaping 1 small three -circuit tuner. Swirls list. Dept. 3017. llinghamton.N. V. experimental work is 1 .0005-mt. variable condenser. leak furnished FREE WITH THE COURSE AROUND THE WORLD WITH 1 .00025-mf. grid condenser, with grid -parts for making twelve different ra- THE INTERNATIONAL CLUB clips. dio circuits and the Peerless Signagraph 1 .001-mf. fixed condenser. for code instruction. Exchange letters, post cards. magazines. form interesting and 2-m f.speaker filter condenser. friendships with members in Old Mexico. Spain. Cuba. educational 3 cushion sockets. Porto Rico, Central and South America Language students. R. I. A. backed by RCA, G -E 1 filament switch. travelers. educated young people everywhere. send 10 cents in and Westinghouse stamps for booklet and full particulars 1 3 -ampere filament ballast. 2 low -ratio audio -frequency transformers. Conducted by RCA and enjoying the ad- HAVANA. CUBA INTERNATIONAL CLUB. BOX 670, I output transformer or output impedance. vantages of RCA's associates, General Elec- 1 0 to 500,000 -ohm volume control. tric and Westinghouse, the Radio Institute Miles on 2 Gals. of Gas ra- 120 1 7 -wire battery cable. of America can and does give the finest dio instruction obtainable anywhere. Starts Coldest Motor Instantly. For all 1 7" x 18" hard rubber, bakelite or celoron cars. Including new Ford, One Free to front panel. Home Study Course Exclusive Agents. Liberal drawing ac- 1 7" x 16" hard rubber, bakelite or celoron expenses guaranteed sub -panel. Moreover, you can STUDY AT count and traveling HOME-when you please and as long to distributors. 2 sub -panel mounting brackets. as you please. CURTAN-QUICKSTART CO. 1 midget jack. This new booklet describing the Dept. 863-B, 154 E. Erie St.. Chicago, Ill. Necessary hook-up wires, screws, lugs, etc. course is Just off the press. If you want Names of manufacturers of parts used in to learn more --bout the lucrative and this ,eceic'er- be fascinating profession of radio send eekly, .Building! the construction of will the coupon now for your copy. furnished free upon request. EJ£0$75 Radio , Sets RADIO INSTITUTE OF AMERICA Join the Assnclntlonl We train you to build and repair TOOL LIST radio sets-start you In business-enable ydu to earn Dept. G-2 326 Broadway, New York City 83 an hour upwards. Free 5 -Tube Radio Set to mem- Pliers, several kinds. bers. Write for special limited -time plan whereby your membership need not cost you a cent. write Screw -drivers, several sizes. RADIO INSTITUTE OF AMERICA today! Hammer, hacksaw and blades. Dept. G-2 326 Broadway, New York City RADIO ASSOCIATION OF AMERICA Dept. SN-2 4518 Ravenswood Ave. Chicago. Ill. 1land drill. Dear Mr. Duncan: Twistdrills, several sizes. Please send me your new catalog. I want to know Scriber. more about your new radio course. RICITY MIA/lo+m Center -punch. Name with he.tlool, on mleoulpmen,. NoMwL.;no4.,nn.. CT Ar.ww.rL.rnlnlnlnnyoulor.Ic.AoAyl+ Soldering iron, electric or other type. Address .. U4 w.et .nd up. Wrin fog 111C eREE pmL nd nma,luJlne R. R, Ine.nJ bond \Johns 15.1.1..6 Fie: Wire solder, self -fluxing or plain solder and I ItIINT FLICTatCAL Iotootl, orinr-rE0.. 00,.1..40. flux. non -corrosive 962 Science and Invention for February, 1928 YOUR High School Radio Wrinkles AVIATION Education in These RADIO WRINKLES accepted and published will be paid for at regular Twelve Question and rates 3 Answer Books! LATEST BOOKS . Get a complete LOW LOSS SOCKET

High School Educa- ' DESIGN pt "0, o tion with all the fun CONSTRUCTION of playing a game! o Q0 Just read fascinat- BAKELITE MAINTENANCE ing questions and SUB - BASE OPERATION answers! Twenty minutes a day will Examine fit you for bigger them pay, social and business success! FREE Complete Course only These twelve wonderful books teach you every high school subject: English, 158J French, Spanish, Latin; Ancient, Modern SAW and \merman History: Literature,Biology, Easy CUTS PRICE Physics, Algebra, and Economics. Used in thousands of High Schools. Qualify for Certificate. Terms 541 $5.00 SEND Examine these NO MONEY twelve books 700 Pages FREE. No money in advance, pay nothing on delivery. A very good low loss socket can be made Keep the hooks 5 by days. Then decide. Return then if taking an ordinary one and screwing it to a 500 Illustrations you choose. Otherwise send S3.85 first payment and square piece of bakelite or hard rubber by 84.00 monthly for three months-total only 815.55 means of small screws. (10% discount for The socket is then cash, making price only $14.27). cut in quartets by means a Send name and address of hack -saw. This now. socket will be found to be quite an improve- HIGH SCHOOL HOME STUDY BUREAU ment when used on very short wavelengths, Contents of each chapter-I. Aircraft Types. II. 31 Union Lighter -than-Air Craft. Square, Dept. 242, New York, N. Y. as losses are cut down to a minimum. If the III. Early Airplane De- saw cuts are too wide, care should be taken signs. General Design Considerations. I\. Design so that the tube is inserted and Construction of Aerofoils. V. Arrangement, the right way. Fabrication and Bracing J. C. F. Walton, Rep. No. 23,087. of Airplane Wings. VI, $25.00 Drawing Course for $2.98 Airplane Fuselage and Landing Gear VII. Airplane Construction Haven't you often wished that you could draw Pourer Plant Types and Installation. cartoons, illustrate some Idea, sketch some pretty \'III. Aviation Engine Design and Construction. face, etc.? You SHORT-WAVE Air-cooled Engines. can do all of these things. CONDENSER IX. Aviation Engine Design One of America's most famous Cartoonists and Construction. Water -Cooled Engines. and Illustrators has developed a great, tion Engine Auxiliaries. X. Avia- simple system for encores In all branches CONDENSER XI. Aircraft Propeller of Commercial Art. This system Construction and Action. XII. Airplane has PLATES rium and Control Principles. Equilib- revolutionized the entire theory of XIII. Uncrating, Set- drawing. it means that drawing can ting Up and Aligning \irplane. XIV. be as easy for Inspection and you as writing- Maintenance of Airplanes and Engines. XV. much simpler than learning short- :x tails of Modern Airships and Airplanes. De- hand. bookkeeping or tYpe.vriting. planes, X\'I. Sea- We are now placing this original Flying Boats, Amphibians and system for craft. XVII. Some \spects Other Air- learning Drawing. Art, and Ca/loaning. con- of Commercial Aviation. sisting of 31 lessons, with over 533 Illustra- XViII. \ircraft Instruments and Aerial tions, within reach of Navigation. every one. it you XIX. Standard Nomenclature for Aeronautics, will devote a few hours each week to the Report No. 240, Part I. Course WE ABSOLUTELY GUAR \NTEE that will kern to This book is you draw and draw well written in simple, understandable before you have half finished the Course. ang uage. If we fail to make this claim good we will refund every cent paid us. By eliminating a large once force for answering co-resymd- ence. expensive catalogs. etc., we are AVIATION to a prhe of enabled make $2.dt, the chcasect price ENGINES ever known for a high-grade home study course. Many have sent is DIAL CALI 8 RAT ED This book describes letters similar to that of Rob't P. *- ,he baste Davis. of who principles of aviation. Detroit, wrote: I can't see PEG how a balloon, tells little, when others with Inferior how you ask so or dirigible is Courses get from $20 to An ultra short wave condenser can be made. and u Icy It goats VW for theirs. It Is more than I expected." made air. in the draw. It is it big asset. no Learn to from two circular plates which are assembled Describes how an airplane matter what field you are In roes. It shows In as shown in the above illustration. The sta- different detail the. tionary plate is Gans of an alrpl anet Send No Money FREE: clre mounted on the sub -panel or what they are and what lho baseboard. A do. they Just order the Coarse. and Ca at once calibrated peg is affixed to the Describes all types n no we will include planes of air- on arrival pay IkrstanaLm a drawing outfit. movable plate and projects through the panel. and how they differ In plus a tea cents postage Consisting of artist's Thus very fine readings can be The construction, as well as de- payment in full for taken. tailing the advantages the entire nenciis pens, Paper. capacity of this condenser may be raised by and Course and Free Drawing Outfit. erasers, thumb tacks. disadvantages of different If not entirely satisfied, putting some sheets of mica between the types of aircraft.. It Includes return. enabling you to plates. complete within five days and we will RE- go to work without The dial 'readings will be more com- dictionary of avia- FUND MONEY. Address: any additional cost. plicated, but greater accuracy be tion terms and clear drawings will ob- of leading airplanes. LEDERER SCHOOL OF DRAWING Dept. tained.-Joseph L. Johnson. Chattanooga, Tenn.I 6542-T Orders from outside the U. f4. A. are payable 53.28 with order. cash PREVENTING WIRE BREAKAGE 274 PAGES PRICE $1.25 ZIP -ZIP A. B. C. OF SHOOTER AVIATION CLIP LET'S GO, BOYS! WIRE USUALLY= This treatise, written by a Hunting, %Ming or camp- BREAKS OFF HERE recognized authority on all of the practical aspects ing. wherever you go you .. of will need a Zip-Zip Shoot- internal combustion engine er, elastic and lasting, mobr. construction, maintenance. with plenty of pep and and repair. tills the need force; srientilirally as no other book does. and practically made. The matter See your deader-if he can't supply you Is logically order from us. Zip arranged; all descriptive mat- -Zip Shooter, 35c. or ter is simply three for $1.00; send stumps, coin, or expressed and money osier. SHORT PIECE OF Nº.14 copiously illustrated. so that BUS WIRE SOLDERED TO anyone can understand air- AUTOMATIC RUBBER CO., Dept. BB, Columbia, S. C. plane engine operation and CLIP repair even If without pre- The POWER vious mechanical training. ANTENNA -11--s,71r" This work is invaluable for Non anyone desiring to become -directional, is efficient, an aviator or aviator mechan- and adds quality and tone to ician. all sets, greater distance, less FLEXIBLE FRICTION TAPE PRICE static, no interference of other INSULATED 51.25 aerials, takes little space, has WIRE Remit by cash. stamps, check, money order. special coil in dome cap, guy or wires connected for service, The wire soldered to test clips usually breaks No C.O.D.'s as well as the four high-grade off at the point shown in the above diagram. non-sweatable special No. 14 This may be prevented by Soldering a short We Pay Postage On All Books copperweld coils. Special piece of bits bar wire to the under side of the price, complete, post paid, clip. The wire is then tightly wrapped with . e, with 10-ft conduit pipe- friction tape, which helps to keep the in- -- $113.00: leap CONSRAD COMPANY, Inc. - pipe, %S.50. sulation from fraying and_ also provides a Radio Power Co., 128 -13th St., Milwaukee, Wis. better grip.-D. S. .Jenkins. 230 'FIFTH AVENUE NEW YORK Ycicn. a and Invention for February, 1928 963

IS you can sell the finest tailoring 1, America at a price w hlch meas.+ big profits you, you need the Leonard Line. Features Itoyard and a third display lehgths. The kind of tine hand tailoring clothes bankers, law. yen, business men wear. Special Imported woolens, Unless you can sell 150 stets a season don't write. Leonard Custom MAKI - lTnllors, 12th- Floor, Leonard Building, MONEY- -I ICincinnati, chin. á1O00 Profit in 6 weeks by"Miller." New, Amazing Cleaner. Cleans Everything. 250% profit. Sample free. Bestever Products Co., - 43258V Irving Park, Chicago, III. POLMET POLISHING CLOTH, -Cleans

I all metals, gets enthusiastic attention, sells fast at 25e:' sample free. F. C. Gale Co., 99 Filia - 1 born St.. Boston, Mass. New Household Device w ashes, dries win- $1.00 to $7.®o Per Hour for dows, sweeps. cleans walls, scrubs, more Costs less than brooms. Over half profit. Harpers, 530 Third St., Fairfield, Iowa. Your Full or Spare Tíme Clear 175-5100 weekly writing orders for Peerless node -to -measure, rain-prool If you can show America's finest' Agents $240 month and auto to travel Caps -also famous Aero caps. $1.00 Drollt-1 line of dresses. coats and lingerie. we wllldn. Bonus besides. Introduce new line $2.80 sale. Outfit Free. Peerless Co., Dept. show you how to make 525 to $125 a a eek,'guaranteed hosiery for men, women, all - N-85, Covington, KY. Style book and details free Write liar- dren. 126 styles, colors. Beats store prices. Get 1000 money making opportunities ford Frocks, 215 Walnut Street Indian- Guaranteed to wear 7 months or new hose from reliable firms Free. No obligation. send apolts. Ind. (A subsidiary, of !teal Silk free. Finest line Silk Hosiery you ever name and address, Salesology Magazine, Hosiery Mills.) saw. New sales plan. Credit given. Spare 300 N. Dearborn, Desk C -I, Chicago, III. time satisfactory. Write for samples. Wil- Business of your own! Proved earnings knit Hosiery Co., Dept. 835, Greenfield, r Tailoring Salesmen: Selling Simpson'a 165.00 week. Large company established 1887 new 123.50 pure virgin wool suits, topcoats; supplies all capital. Wonderful o portunity for Oh1o. commissions In advance; exclusive territory, men of unquestioned standing In their corn- Women Representatives Wanted. New big outfit 175 samples Free. J. B. Simpson, tnunity. No traveling. Not stocks. Insurance Invention prevents shoulder straps slipping. No 843 Adams. Dept, 1454, Chicago, eel, Women adore Write for or books. Write giving age, and past business more discomfort. it. No. 33, over experience. Fairbanks. Dept. 12-B, Oakley particulars and free offer. Lingerie "V" Com- Free Want Ad Catalogue Ave.. pany, 5 Lake St., North Windham. Conn, 1,000. publications, Many combination offers. & Wabansla Chicago. Publishers rates, place anywhere, Brincker- 10 Book Library 10c. Amazing Bargain New lines just out. Everything In hoe, Inc., 37 W. Van Buren, Chicago, Ill. ' to Interest new friends In Pathfinder Magazine. hosiery, underwear and Rayon lingerie for 'Chief. Contains encyclopedia of weekly events. men, women, children. Beautiful. Irre- Write for Free Samples. Introduce and Samples now ready. tails" Guam nteed Silk. Broadcloth, Work Shirts. Money -making opportunities. Stories. Humor, sistible Catalog experience Pay News. Pictures. Send one dime for 10 books. New special big money plans. Cash bonus No capital or needed. lour D. C. service awards, rapid promotion. No Capital Daily. Monthly bonus extra. Cincinnati Pathfinder Library Dept., Washington, 2002, Choice . territories Rush Shirt Co., Shop Cincinnati, O. Agents $240 month. Bonus besides. needed... going. Guaran- reply to World's Star Knitting Co.. 112 200,000 agents looking for something to introduce finest line silk hosiery. Lake Bay Mich agents business teed 7 months. We furnish auto and give St., City, sell. You can start mall order you fine silk hosiery' for your own use. Sals- Don't worry with small profits and un- In apare time. We spent lifetime learning how. ifies furnished. Write quick. Betterknit known articled Backed by tremendous na- Have Just written correspondence course. Ex. . , everything about starting own busi- cattle Co. Silk 435, Greenfield. Ohio. tional advertising. hundreds of Nogar salesmen plains your are making 5500 to 51,000 monthly Right Now. ness. Over 25,000 words bolkd down to facts. BIG PAY EVERY DAY! Complete guar- Just send $1.00. We ship complete course wearer. World's longest wearing suits, a12.50. Amaz- lmeed line direct to Dress Shirts, ing wear demonstration makes big, steady o { C.O.D. for 32.98, postpaid, Money refunded Jf ork Shins. Flannels, Overalls, Pants, Leather sated reefed'. Write today for Free Kit, not saUatactory. We made good. Will you? oats. Sweaters. Playstüts. 510-525 dally! Ex- [Quinton. 365 Lincoln Place, Brooklyn, N. Y. perience unnecessary. Big Outfit FREEI Nlm- full starting Instructions. Nogar Clothing' rod Co..Dapt 58,4922-28 Lincoln Ave., Chicago. Mfg. Co.. Dept. (:S-2. Reading, Pa. TO SQUARE -DEAL Men -South American work. Oil, Men, get Forest Ranger Job; 5125-5200 Fruit, Rubber companies. Good pay. Ex- I.11 pay men $100 a week for sell- ADVERTISERS ONLY penses paid. South American Service Bureau. wool sults month and home furnished; permanent, bunt, ing our tailored to measure nil write 270 - Iba refuse orer 53,000 Loral, .01 °uestftinable 14,000 Alma, Detroit, Mich. end overcoats at $23.50 and 531.50. illshest fish, trap. For details Norton. Temple Court. Denver, Colo. . advertising creep month. - Earn Money at Home, Full or Sara commissions. Extra Bonus for producers. Large do bustness on the bass of_ sari fae- swatch samples tree. W. Z. Gibson. Inc.. 500 Punchboord Salesmen Take Notice.New But if you time. Oil Paint Photos. New Method. Easily flon or money bark" write are. Mastered. Highly Profitable. Oil Paint Data Throop St. Dept. P-672. Chicago. fascinating game "Excitement." Can be used rotes in and other magazines address all states, $200 weekly easy. One minute For this tit Free. Steady employment. Write, Free Book. Free Cap and Great New 1928 Rain - Publishers Classified Service, 9 East 46:5 St., Pictorial Art Studios, Inc., 2926 Broadway New- sales talk. Pay daily, Cigar Stores Novelty Proof Cap Lind Made -to -measure. CA., Dept. P, Peoria, Ill. New York, Dept. S. NI. C.. Chicago. est styles. $20.00 daily. $100 profit -- Amazing New' Glass Cleaner offers you .12.85 sale. Excellent side line. - Champion Agents; 500% Profit Free Samples Gold Agents - Sensational Profits taking 315 a day sure! Cleans windows, window - [Caps, Dept. B -I. Cincinnati. Ohio., Sign Letters for Stores and office windows. orders for Taylor made -to -measure. ra'n-proof shields. show eases, etc., without water, soap caps and women's hats. $75 to $100 weekly] a Easily applied. Large demand everywhere. No muss. demonstrated. Ladies make 115.00 day Introducing Metallic Letter Co., 431 N. Clark, Chicago. or chamois. Easily Commission in advance. We deliver outfit tree. new "Christmas Eve" delightful French Housewives. motorists, garages, stores. Instl- Taylor Cap Manufacturing Co. Desk E -l0, perfume. Ounce bottle worth $7.85. You New Invention beats vacuum sweeper and tatlons.buy on sight. Write for Special In- Cincinnati, Ohlo. sell it for $1.25.. Make 50c on each sale. all Its attachments. Electricity unnecessary, troductory Offer. Jiffy Glass Cleaner Co.. Write for full particulars or send 81.25 for All complete 52.05. Over 100% profit. Mor- 1061 Nionmourh, Cincinnati. O. demonstrating bottle. which guarantees quick gan, Slrg., 797 Grimes St. Fairfield. Iowa. Earn - $80.00 . weekly with Fashion SCHOOLS sales. Sorel. Perfumers, 551 Fifth Avenue, Saleswomen, Salesmen makcbie money, Frocks for women. Big line new sty l's at Home Study and Resident New York. taking orders for our beautiful Dress Goods. factory priors. - Big advance commissions 7125.00 daily selling colored Raincoats and elks, Wash Fabrics]. handkerchiefs. I rosier y No experience necessary. New plan! Fashion Learn Piano by Ear in 90 days -Make Slickers, Red. Blue, Green, 52.93. Hat Fancy Goods. 1000 samples furnished. National Docks, Inc., Deist. 10-100, Cincinnati, Ohio. money, be popular -No tiresome practice etc notes to learn,- Write for Free Book, Free. Pay dally. Outfit Free. Elliott Brad- importing Co., Dept.B-89, 573 Broadway.N.Y. Old estnb, mitt. co. gives you credit; -No ley. 241 VanBuren, Dept. AF -2, Chicago. Illinois School Of Ntusl°. 133 Hunter Building, Be a Real Ccr:.te Expert. $5.003-$15,003 starts you in business (city or country) selling Chicago. 111, w America's Greatest Tailoring Line Free! yearly. Experience unnecessary. 1'11 teach 185 widely known household necessities. Per 130 large Swatch Sampples-All Wool -Tailored you everything. Connect you with my chain manent business; steady customers; large Girls wanted for stage. Blg pay. to Order -Union Made --Sensational low price. of real estate ex^wets. Write (or FREE Profits. NfcConnon. Dept:F112, Winona, Minn Learn stage dancing at home in spare Get outfit at once. Address Dept. 306. Good - booklet. National Real Estate Institute, time. ie Costs Only a few cents a day. Ankrum Advertising Agency, A20 8V, Write for free booklet. Veronine Vesta wear, 844 W. Adams. Chicago. Dept. 500. Fort Smith, Ark. Jackson Blvd., Chicago, III., specialists in free! Features on, , Studio B, 1 100. West . 72nd Street, $5,000.00 Given. 350 Cash Prizes. Great neckwear line now direct selling, mail-Order and poultry advertis- New York. N. Y. , l50 persons -men. women, boys. girls. finest quality neckwear at factory prices. ing. Secelen circular and estalog on reauest. who send me their names get prizes -from Collect big commissions daily. Write for Men 18 up, 51700-52700 year. Ry. Postal No Dull Times Sailing Food. People Clerks. Ntall Carriers. Common education :5.00 to 52,000.00 -with $50000 extra for FREE tie over and FREE outfit. Naweo must eat. Federal distributors make 5J,000 City promptness. Horse Creek, Wyoming, man Neckwear. Desk 11-125, Covington. KY. sunklent. Write immediately for full particulars. yearly and up. No capital or experience Franklin Inst., Dept. T110, Rochester, N. Y. won $1,735.00. Woman In Claysville, Pa- Why work for others? Employ agents needed; guaranteed sake: unsold goals may . won 11,000.00. I make this offer becalm. yourself. Slake your own products, Toilet be returned. We furnish you with sample Learn Electricity In Los Angeles. Tech- I want to send everyone who answers this articles household specialties, etc: '500% license and Free Samples for customers nical practical training quallfirs you for raspan. an absolutely free sample ease, announcement profit. Valuable booklet free. Net' 1 Scientific -Sure repeat orders. Exclusive territory. sible position. School established 1905. Ap- of my products. Send no mOneyl No ob- Laboratories. 1925-W Broad, Richmond, Va. Ask nowt Federal Pure Food- Co., -82311 proved by electrical Industry. 17.000 succesdul ligation. Nothing to buy -now or ever! Archer, Chicago graduatrs. Free booklet. Nat'l Electrical School. Just say "Bow can I get a prize., G. L. Free: Wholesale Specialty Catalog. 4006 -AX, So. Flgueros, Los Angeles, Calif. Culver. Room 9, 500 North Dearborn St., shoes log best sellers from many parts of the $1,003.00 Reward if this is not the great- Chicago, Ill. world, Many home and once articles. listed, est money -making house to house proposition Men, become Forest Rangers: 1t25-5200 Spores Impt. Co., Lesucur Center. Minn. ever known. , N.R.C. tablets , wash clothes Inonth and home furnishes: permanent, hunt Sell beautiful "Style Tailored" shins in 10 minutes without rubbing. Free Samples. fish, trap etc. For details. write Norton, 270 and neckties direct to wearer at factory prices. Sell Men's Fine Suits (extra trousers Denver, Colo. free) for 516.95. $90 a week for you, N.R.G. Co., P232, W. Superior, Chicago. . templeCourt. Many beginners earn 550 nrst week in spare elso fine time. 1100 weekly full time rosy. Scllln2 tailored pants.- 53.95, (55.00 value),t{Blg Sell by Mallt Spare 'lime,' big Profits, Woman -Care for invalid, homes extra commissions. Both sample outfits!free Books, Novelties, Bargains. Ready Jvlade your vicinity. $21 weekly if willing to take outfit Free. Howard Shirts. 1219 Van Buren, In 10, Chicago. It you unite quick. Tru - tit, . 80.8-A Broad- Circular Service. 48 -page -Catalog Free. home training course nursing. Winthrop Factory way. New York. Nurse Service, D6206 1Vlnthrop, Chicago. Why not sell us your spare time? $2.00 M. Elfeo. 525 8. Dearborn Street, Chicago. Quick Cleanup for Live Alienist Cash Amazing 512 Dien qualify forest Ranger Position; an hour, $19.70 daily easy full time. In- pagebook-"SafeCounscl," and vacation. Patrol 12 Guaranteed ?hosiery In on this craze for Colonial rugs sweeping coun- tells the truth about sex-. Explains the Leas of start 5125 month: cabin troduce months forests: the game, Write Mokane, x-47 styles, 39 colors, for men, women, chil- try. Every housewife buying. Agents earning the Love -life. -el Scores Of intimate subjects. the protect dren. Including latest "811k to the Top" 1100 weekly. Bettermade Puritan rugs sell at 104 chapters, 12f Illustrations, Send no money Dept. 7,1-44. Denver, Colo. "- Ladles'. ,jiose. No capital or experience half store priers. Bit{ Commissions advanced. -Write for a copy. - We'll send our regular Bin Pay Jobs open In Automotive field, needed.. We furnish samples. Silk hose for Write for offer.' No obligation. Puritan 54.00 Gift Edition. Pay postman only 5198. Learn how on real equipment with real shop pour own use FREE. New Plan. Macochee Rug Co., 532 South Street, Waltham. Mass. plus postage upon arrival. Satisfaction teleran. tools In eight weeks. Satisfaction guaran- floslery Co.. Road 9282, Cincinnati, O. Dept. 369. teed. Catalog Free. J. Z. Smith Co.. 800 N. teed. Write quick for special tuition offer Send 25 Cents for a 11.00 Pocket Cigar Clark Street, Chicago, Dept. 4700. Including board and railroad fare. McSweeney IF IT'S NOT HERE WRITE US! Lighter and learn how to make 510.00 a Ladies, reputable manufacturer offers Auto Schools. Dept. 21-B, Cleveland, O. and day Easy. Sells on sight. Particulars FREE. you opportunity to make extra money spare Cincinnati, O. Sere is a new stroke for the convenience of Co., 7990 Broadway, Bur readers. If you are looking for certain articles Rapid Manufacturing time, experience unnecessary- 1 No selling. Men -Women, 18-50, qualify for F'' InfOsmation Dept., New York World Mfg. Co., 346 6th Avenue, New York. Ranger. Ry. Mall Clerk, Special Agents, other listed below, write P.C.S. month: write IW 0 East 46:8 Sl., New York. For each (hem to be Women! Earn $3-56 an )lour. Display DISTRICT -- SALESMAN - All wool, Govt. Positions. 5140-5200 enrestigaled, please enclose 10e. to corer cost of beautiful Fifth Avc, dresses to friends. Fac- Union Made suits, overcoats, 523.50. Liberal snation Bureau. Dept. 137. St. Louis- Mot postage. tory prices. Cash commissions in advance. advance commission. bonus-- Write for large Earn 525 Weekly, Spare Time, Writing Men's Wear' Pleasant amt. Exp. unnecessary, Write FREE outfit. O. W.7;arvey, Box 00, Chicago. for Newspapers, Magazines; exp. unnecessary. Gloves, Handkerchiefs, Lumber Fifth Ave. Styles, Dept. 1002, Scranton, Pa. "How to Write for Pay" Belts, Collars ^-+ MANAGERS Copyright Book Jackets Knickers, Mullins, Pajamas, Slippers. Make ma Money representing the DISTRICT Free! 1307 Press Institute, St. Louis, Mo, 'Shoes, Underwear Only firm that guarantees shipment of gen- Producing Managers who know good Men -Get Railway Mall Clerk or Forest Auto Supplies - Tailored-to-Pleosure Clothing within tailoring and genuine value, write or wire for uine wool and worsted Ranger Job with Government: 5(25-5225 Auto Tires, Carburetors, Dimmers Gas Savers. 10 days after receipt Of order. Complete Information. All pure Bulto month. Permanent, short hours. Write Warren Rear View Mirrors, Tire Patches, Pliers. 523.50 and 529.50 lines, Big commissions, and topcoats at 518.75 with 53.75 to sales- Plugs. manager. free. of Inst., 500 Colorado Bidg.. Denver. Coto. Wrenches, Auto Polish, Spark Trouble The Style-Center Tailoring Co , Dept. 8.20. man and 7% to Outfits One Light Cincinnati. Ohio. the largest companies In America.. We back We are in touch with the best and most reliable Food Stuffs every garment. Canterbury Tailors, 22 West New Rubber Goodº Line. 47 Money schools In America, Canned Goods. Coffee and Tea Sanitary Car- 22nd Street, New York. - If you are interested in art, engineering, flee-' Men's Specialties Makers. Aprons. Baby Goods, any kind of business melite, Clove,, Rubber Rugs. Cushions. Shop- Finest shirt line in America with Mail, radio, aviation. or 111 Receivers Initialed Dilltold, Sult Hangers, Best values. best selling outfit. Big doubled swatches. training, we will help you find what you wart. netts, Watches ping Bags, etc. Big" profits. of postage and Deal with factory at Rubber Center. 590 Outfits free. Prices and commission arrange - Please enclose 10e. to cover-cost Household Specialties for ments right? Send full information about receive advice of prominent school expert, Ad- Fire Extinguishers, Mending Fluids. weekly easy. Credit given. Verlte quick 1rushes. territory. Catalog and Free Outfit Offer yourself and your record. Cobfidentiaa. dress School Dept., P.C.S., 9 East 46111 St New totheroof Bags, Moth -killing LIeuld, Paints. Akron. Ohio. Sales Mgr., 20 West 22nd Street. Nee' York York. Vacuum Cleaners Window Washer Krtatee Mfg. Co., 92 Dar St., Kltcisea Specialties Aluminum Cleaner, Can Openers, Cookers Women's Wear Aprons, Coate, Sanitary Belts Women'. Specialties Hosiery Mender. Jewelry, Sanitary Good° Home Furnishings . óú Linens. Nursery Stock Mete,. ry.a /it-'10101. 964 Science and Invention for February, 1928 SIMPLE LIGHTNING ARRESTOR

TO What will you AERIAL be doing one year from to -day? TO SET SPARK Three hundred and sixty-five days from PLUG now-what? Will you still be struggling along in 1' PIPE the same old jobat the same old salary GROUND -worried about the future-never DO YOUR OWN WIRING quite able to make both ends meet- - AND SAVE 50% standing still while other men go ahead? \\\rr/// j"', " iuíi,.i v7 One year from today will you still be .í__JI 496 Pages -390 Illustrations licensed wireman off At the expense of about a dollar, a very If there Is.no in your neighbor- putting your start toward success- neat hood you can easily wire your House, Barn or thrilled with ambition one moment and and efficient lightning arrestor may be con- Garage YOURSELF. structed. A spark plug is screwed into the then cold the end IT TELLS YOU JUST HOW TODO IT next-delaying, waiting, of a length of 1 -inch pipe which has been driven It contains The National Electrical Code explained = fiddling away the precious hours that into the ground as an earth connection.-D. and Illustrated. New Illustrated chapters on Out- will never come again? Borowitz. Reo. No. 24259 side Wiring and Inside Wiring for all systems for both direct and alternating currents. House and Residence Wiring. Garage .Wiring. Theatre 'end Don't do it, man-don't do it. Moving Picture House Wiring. Marine Wiring, GRID LEAK CLIP Electric Sign Wiring, Radio Wiring. There is no greater tragedy in the How to Install. ooerate and care for Generators. Motors, Storage Batteries. Meters. Electric Ranges world than that of a man who stays in and every kind of wiring device for light, heat and the rut all his life, when with just a power and Radie Wiring. he Leather Cover Gilt Edges. Pocket Sire. $3.00 little effort could bring large success Sent Post Paid on receipt of Price el within his grasp. H. C. CUSHING, Jr. Make up your mind today that you're 13 WEST 55th STREET NEW YORK. going to train yourself to do some one thing well. Choose the work you like best in the list below, mark an X beside TUBE it, mail the coupon to Scranton, and without cost or obligation, at least get - the full story of what the I. C. S. can do RA DIO for you. DIAL Latest 001 advanced circuit. All INTERNATIONAL CORRESPONDENCE SCHOOLS steel chassis total ly shielded. y.3Z I "7'he Cairo sod I'nicersity" Balanced parta of best Quality. The average grid leak is mounted in parallel to Marvelous power and »electivity. Box 6217-E, Scranton, Penna. the Geta the grid condenser, hence it is often desirable Ian nn a stations clear a. a bell. Without cost or obligation. please send me a ropy of to On dtacf s four motrol. Án enaurpansed valne- your booklet, "Who Wins and Why," and full particulars extend the leads to form clips as shown above. [ t one of oar many mighty bargains. about the subject befwe which 1 have marked S: r FREE Log and Call Rook eau+a/-ivaeontltepreaa. Foil of °Industrial Management Business Correspondence LOUD -TALKER RsetMewadio Iwruaina. send for your trae copy seal Personnel Management Show Card and Sign SWITCHES American Auto a Radio Mfg. Co. Traftle Management Lettering hfi Hams Scrrwaansao. Pres. Business law Stenography and Typing Dept. 272 an,rrican'kadia Bldg., Kansas City, Ma. a Accounting and C.P.A. Civil Service Coaching Railway Mall Clerk Cost Accounting Common School Subjects Rookkee pD Ing French High School Subjects Secretor al Work U Magazine and Book olié CÁfV nRN ! ]Spanish ['Salesmanship Illustrator No talent er eseert Done ' !Advertising Cartooning F'arinating work Pays big coo TECHNICAL AND COURSES Co-nplot, twat -action took TE INDUSTRIAL ABOUT: AlD habeta Color,. HO y y Electrical Engineer Architect TO MIX PAINTS. 3h Garda, Electric Lighting Architects' Blueprints Window (bard and Wail Siena, yC .r Mechanical Engineer Contractor and Builder ¡Ry dp( de letters. Gldine. shJ>o3r.. Mechanical - TIcbets Oe' THE TnADII loo / Draftsman Architectural Draftsman fIrma 100 Alphabets and Deafens gook (d O- Machine Shop Practice []Concrete Builder MUnd Bexd,ln Init. leather, a i y00 Railroad Positions Structural Engineer and four ballbaringbearing Show Card s Cas Engine Operating GChemistry El Pharmacy TO n Pens. H.0. and Pens sent postpaid ° Civil Engineer for $3.00. IC.O.D.leel. 0 Automobile Work LOUD Og11v+ePub.Co.,57Rose5t. De p. 109, Newyork Surveying and Mapping 0 Airplane Engines SPEAKER D Met allurgy Mining Agriculture and Poultry B' rrr EARN MONÉY%MMfD24TELY--' Steam Engineering Radio Mathematics ::WE FURN-y. /EQUIPMENT TO START Name TO 0 STANT Street Address.... PHONES LOUD SPEAKER City State A PIMPLES. Two S.P.D.T. switches and one D.P.D.T. Cleared in Occupation Up-often 24 hours. To prove switch may be combined to vary the connec- you can be rid If yen reside in Canada. send this coupon to the /ntenu- of Pimples, Blackheads, Acne tional Correspondence Schools Canadian, Limited, Montreal tions to a series of loud -talkers at different Eruptions on the face or body, Barbers' Itch, points.-J. R. Meager. Eczema, Enlarged Pores Oily simply or Shiny Skin, send me your name and address today-no mat-se no obligation. CLEAR -TONE tried and tested in over LOCKING BATTERY SWITCH 100,000 caste-used like toilet water --is simply nlaldtal __4,,i0:1: ANY BOOK IN PRINT in prompt results. You can repay the favor by telling ousan Delivered at your door. We pay the poet- your friends: U not, the loos is mine. WRITE TODAY. Th Saar 't age. Standard authors, fine editions, new E. S. GIVENS, 468 Chemical Bldg., Kansas City, Mo. books, all at biggest casings. Be sure to I send postcard for Clarkson'» eater! FREEThis 2 catalog un a abort course in DRAW GPRTtNS literature and is no used by some of Amer- . cpisGe universities; rite book sere .-1, TURN YOUR TALENT INTO MONEY buy from it iftyouw y' Cartoonists earn from $ i0 to $250 per reek-some even more Remarkable new DAVID B. CLARKSON BREOKER REMOVE PLUNGER Circle System of i)raaing teaches you In 151 CLARKSON BLDG. CHICAGO, ILL. c half the usual time. Send for booklet a AND FILE OR GRIND and sample lesson plate explaining full details of the Course. No salesman will OFF; SHOULDER call. THE NATIONAL SCHOOL SHOULDER OF CARTOONING FREE --Radio Catalog 628 Penton Building Cleveland, Ohio To Dealers --Nets, Illustrated 1925 Wholesale Radio Catalog gives lowest prices on accessories, kite. parks. pans. and Sets. FeaWres master -built single control radio eta for both battery and all electric operation. Pull A filament lock switch may be made from a Showing of "A" and "B" Eliminators and thousands of push pull type switch by removing the other great values. Write on business letterhead for this today. plunger and filing off the shoulder. This makes tree book it -Carr Radio Corporation possible for the plunger to be entirely re- Wonderful, new device, -guides your hand; correct, Hamilton moved from the switch thus opening the cir- your welting in few days. Big improvement in three n1 W. Lake Street Dept. 382 Chicago, III. hours,_ No failures. cuit.-D. S. Jenkins. Complete outline FRER. Perfect Penmanship Inst.. Dept. 44. Sf. Louts, Mo. Science and Iuventíou for February, 1928 965

CODE PRACTICE SET _____ ---PHONES i -

-11111 BATTERY-, BUZZER- J The usual code practice set requires the use of two buzzers and often 2 sets of batteries, thus making the assembly rather expensive. Using the arrangement shown above, I buzzer and I battery may be used to take the place of a lar- $1 ger number regardless of the number of head sets and keys in use.-R. L. Pepperberg. Rep. ya No. 20490. An authority DOOR LOUD SPEAKER who knows! EARLE E. LIEDERMAN-..The Muscle Builder" Author of "Muscle Building" "Science ofWres- R. E. Lacault tling," "Secrets of Strength, "Here's Health," etc. -SEND NO MONEY- MUSCLES Just drop' us a card and mention the 5 Cents a Piece book with your name and address. Wouldn't it be great if we could buy muscles by the hag-take them home and paste them on our We will mail it to you immediately. shoulders? Then our rich friends with money to Upon receipt, you pay the postman buy them, sure would be socking us all over the lots. $1.97 plus a few cents for postage. Put they don't come that easy, fellows. If you want muscle you have to work for it. That's the reason why the lazy fellow never can hope to be THE CONSRAD CO., INC. strong. So if you're lazy and don't want to work- 230 Fifth Ave., New York City you had better quit right here. This talk was never meant for you. I Want Live Ones I've been making big men out of little ones for SAW and 7 over fifteen years. I've made pretty near as many strong men as Heinz has made pickles. My system BLADES Si never fails. That's why I guarantee my works Cuts Wood & Iron to do the trick. That's why they gave me the name of "The Muscle Builder." I have the surest bet that you ever heard of.

The F.P.M. saw cuts wood, iron and bakelite What I'm Going to Do at any angle. Used and recommended by ex- In 30 days I'm going to increase your arm for sturdy, just in every line. Unequalled A loud speaker may be con- on full inch. Yes and add two inches to your Perts construction and fine workmanship. novel and efficient But that's noth- asting a door. The chest in the same length of time. Blades of finest tempered steel. Get the structed by utilizing the panel of ing. I've only started; get this-I'm going to put F.P.M. Saw at any hardware store or order unit is mounted on one side of the door and knobs of muscle on your shoulders like baseballs. direct. clamped securely in position. The two leads I'm going to deepen your chest so that you will should be allowed enough play so that the double your lung capacity. Each bi'eatli you take 1 F.P.M. Saw and 7 Blades sent prepaid 31.00 door may be opened and shut easily. This wí"1 flood every crevice of your pulmonary cavity DEALERS Write for Discounts JOBBERS reproduction with oxygen. This will load your blood with red type of speaker gives excellent corpuscles, shooting life and vitality throughout your 3722 N. Ashland Ave. and the volume is good.-James Francis entire system. I'm going to give you arms and legs F. P. MAXSON r Chicago Clemenger. like pillars. I'm going to work on every inner Imuscle as well, toning up your liver, your heart, CHOKE etc. You'll have a snap to your step and a flash to RADIO FREQUENCY your eye. You'll feel the real pep shooting up and BIU VALUE for. I0 ifs. down your old backbone. You'll stretch out your 6 Bongs, words and innate; 25 P.iea big brawny arms and crave for a chance to crush : --7-:.=tures Pretty Girls; 40 Ways to Make everything before you. You'll just bubble over with -e c)°, Money; 1 Joke Book; 1 Book on vim and animation. Love; 1 Magic Book- 1 Book Letter. Sounds pretty good. what? You can bet your old ukulele Writing-, 1 Dream Book and For- tt'1 good. It's wonderful. And don't forget, fellow-I'm not lust promising all this-I guarantee it. Well. let's get tune Teller; 1 Cook Book; 1 Baso busy, I want some action-so do you. Ball Book, gives rules for games; 1 .%50'' Toy Maker Book; Language of Send for My Free Book Flowers; I Morse Telegraph Alpha- r: o bet; 12 Chemical Experiments; "%%l SU/.2uh.f opintent . Magic Age Table; Great North Polo DIA. , Game 100 Conundrums; 3 Puzzles; 12 Games; 30 Verses for Autograph Albums. All 1 -It's Free the above by mail for 10 cte. and 2 cts. postage. BAKELITE, FIBER OP Take it and read it. It's the peppiest piece of litera- ROYAL SALES CO.. Desk 939 Norwalk, Conn. HARD ture you ever flashed your glimmers on. And 49 full -page _ RUBBER photos of myself and some of my numerous prize-winning THE MIDGET SLIDE RULE pupils. This Is the finest collection of strong men ever as- sembled into one book-Look them over-INstors, lawyers, Instantly adds, subtracts. mul- merchants, mechanics, and every line of trade you can tiplies. divides. solves propor- think of. I swear you'll never let this book get out of tion. gives all roots and pow- Your hands again. And just think-you're getting It for ers. Logarithms. Sines. Cos- nothing. Don't hesitate-there's no strings attached to it. ines. Tangents, Cotangents. etc. Orals it. Also gives decimal equivalents, Take Sour pen or pencil and OtI out the coupon-But do lettered and numbered drill and it now-before you turn this page. tap sizes. atore than 110.000 sold, more than 2.000 unsolicited testi- EARLE E. LIEDERMAN monials. The Engine -divided Dept. 2702 305 Broadway New York City unties are on white finished aluminum and are grease and waterproof. Diameter 40. Price with Instruction Book, The idea illustrated above gives a method for E1.50. Pocket Carrying Case, 50c extra. Cash or C.O.D. constructing radio frequency choke coils at a EARLE E. LIEDERMAN, Catalogue free. Your money back if you are not satisiled.. Dent. 2702. 305 Broadway, New York City minimum of time and expense. Two disks of me absolutely FREE and with- GILSON SLIDE RULE COMPANY. Stuart. Florida. Dear Sir:-Please send bakelite, fibre or hard rubber 7 inches in di- out any obligation on my part whatever. a ropy of your latest honk. "Muscular Development." (Please write or ameter are bolted together. The wire is plot plainly.) ,- WRIST WATCH. GIVEN. wound between these disks making a very Soil my Grape Gum. Gumlota, Candy Mint, etc., at Name he pack. Everybody will buy from l) I Air wrist neat job. Connections may be made as watch end other dandy v to FREE and beeldve Street. rou make money every day.Write today for agent'[ shown or the constructor may use his own peckers. State Cha. David, Sta. V. Cincinnati, O. Dept. 267 ingenuity. City. 966 Science and Invention for February, 1928

Opportunity Ad -lets Y011will find many remarkable opportunities and real bargains in these columns. will made every month by reliable firms, It pay you to read and investigate the offerings dealers and amateurs from all over the country. No matter what you may be seeking, plies, automobile accessories, the opportunity to make money, or anything whether sup- of the month. else, you will find listed here the best and most attractive specials Advertisements in this section twelve cents a word for each inse rtion. Name and address must be included at should accompany all classified advertisements unless placed by an accredited the above rate. Cash accepted. advertising agency. No advertisement for less than 10 words Ten per cent discount for 6 issues, 20 per cent discount for 12 issu es. Objectionable or misleading advertisements not tiseRyents for the April issue must reach us not later than February 5th. accepted. Adver- EXPERIMENTER PUBLISHING CO., INC., 230 Fifth Avenue, New York, N. Y.

Advertisers and Distributors Agents Wasted-(Continued) Che,nisJry-(Continued) Distribute 400 free Stopleak Earn $8. Samples Rivets. $50.00 Weekly easy, applying Gold Initials on Autonlo- Send fie stamps for samples and secure territory. 'theta hiles. No experience needed. $1.45 profit every $1.50 CHEIIIC'. mend"stuff. Co., Y. the EXPERIMENTS"E 25r.xperí Colima, N. job. Free Samples. "'Cairo Monograms," It1043, Wash- published. Roth ington. lust A. Walker Co., 1514 Roston. al ass. ton. D. C. Allison, Washing- Gold Leaf Window Letters & Script Signs. . No ex- Your Advertising Agencies Chemical problems solved and corking process nerlence; 500% Profit. Samples free. Consolidated, 69-R- nished for Five Dollars. Write fur- tVest Van Buren, Chicago. ards, Consulting me. W. Stedman Rich- 24 words -355 Rural Weeklies $14.20. Ad-aleyer, Chemist, Box 2402. Boston, Mass. 4112-81 Hartford, St. Louis, Slo. Succeed With Your Own Products. Slake them yourself. Odd -Unusual Experiments for Formulas, Processes, Trade -Secrets. All contest the chemist. Stories lines. Catalog, s. "Amateur Chemist" IOc. - Circulars free. D. Thaxiy Co., Washington, D. C. Laboratories. 410 Thompson -Allen Agents Wanted W. Pine, Shamokin, Pa. al fitsconsisting Ingo Agents: Big season on. No competition, $10.00-$15.00 Airplanes, Aviation Cdifferent efgpensa laboratory4.00.yrchemi- cala. Generous quantities of each, daily. Rhinestone Initial Buckles. etc., sell on sight. prepaid anywhere including apparatus. No investment. Chatust Co.. 606 Itlue Island. Chicago. United States, all for $1.00. Cash or Biggest, Best Catalog Model Airplanes, C.O.D., only one to a Parts, Supplies; customer, easily worth $20.00. We Pay $48.00 a Week, furnish auto and expenses to Se postpaid. Ideal Company, 1695 Spring Street, New Chemicals guaranteed Pure. Send York. Su tanner Chemical order early to The introduce our Soap and Washing Powder. Buss -Reach Company, Est. 15 years, 1500 St. Co., Dept. A185, Chippewa Falls. Wis. Marks Ascnue, Itrooklti, N. Y. Airy lanes -Send for free cuts and Plans of our wonder- ful two Experimenters: 40 Collect Photos and earn $75 to $125 a week as my Place. Companion t;:pe, small, high life wing Chemical Experiments, 0.25 (coin). representative. Be my representative in your neighbor- monoplane. and information. How to build this ship, and H. James, Olney Springs, Colorado. hood. Just collect photos for our wonderful line of Photo he sure It will fly, also Propeller literaturé. Crawford Medallions, Powder Compacts. Photo Jewelry. Photo Foun- Airplane Manfgr., 2225 Amerlt an Ave., Long Beach, Calif. tain ''ens, etc. No experience, no Investments. Your Correspondence friends, neighbors, your com- Model Courses everybody. prospect. $2-$5 Airplane Engines: ya h. p. 1n 3 lbs.; 1 h. p. 1n on mission each sale. Send for our proposition. Gibson 5 lbs. Stationary Engines: 55 h. p. In 10 lbs.; 1 h. p. in Used Photo 614 correspondence school courses sold on Jewelry Co.. lion 013-608 Gravesend Are.. 15 lbs. Circulars free. DYNAMIC :MFG. CO., First Nat'l basis. Also rented repurchase Brooklyn. N. Y. Bank Bldg., Chicago. and exchanged. Money -hack guarantee. Catalog free. (Courses bought). Lee alountaln, front Alabama. Pisgah, Agents Wanted to sell Men's Hats direct factory. Boys K rite for catalog. Model Hat Mfg. Co.. Dept. 51-11, -12 Inch Cross -Atlantic Model, "Lindy" type East Orange, N. J. Airplane -Sow. 'fakes oft by can Power. Travels over 40 Home Study -Engineering, Bookkeeping. feet. Very fascinating and educational. countancy, High School, Higher Ac- Thrilling fund and 'other courses. Write Carnegie ail Every Day. Will send sample of new Wringer Mop Easy construction set, complete materials; postpaid U. S. College, Rogers, Ohio. with Big Steel Plate on approval. Consince yourself at 5W. (No stamps.) Satisfaction guaranteed or money our risk. Eleanezy. Dept. a1-16, Delphos. U. refunded, Model Aircraft Co., Box 331, Chillicothe. Ohio. New Invention-400% protlt. Liquid quick send for Build and Fly Your Own Monoplane. 20 -foot wing- Detectives Fabrics and Hosiery. Stops runs. Every woman buys. spread. 72 M.P.H. with only 12 H.P. Motor. and Working Plans Hundred other fast sellers. J. E. Johnson Co.. Dept. 862. Drawings complete. $10.00. Warner Co., 311 Detectives Earn Big Money. Travel. Excellent 6129 Wentworth Ave.. Chicago. Edwards Itldg., Cincinnati. Ohio. tunity. Make secret investigations. oppor- where. Experience Great demand es-ery- unnecessary'. \Vrite American Detective Why work for others? Employ agents yourself. Slake System. 2190 Broadway. N. Y. your own products. Tol let Articles, Household Specialties, Battle Photos etc.. 500% profit. 5 aluable booklet free. National Sci- and War Relics entific Laboratories, 1921W Broad, Richmond, \'a. For Dens: Relics front Europe's battlefields (also medals) Electricity Quick Cleanup for Live Agents. Cash in on this craze illustrated catalogue sell h sample sear photos 25e. Interna- for colonial rugs soeeping country. Ever' housewife buy- tional, 885 Flatbush .Are., Brooklyn, N. Y. Electric Fun! Wsenty stunts, ing. Agents earning $100.00 weekly. Itettermade Puritan Campbell, 110 volts, $1. Cuttingen. rugs sell at half store 'prices. Big commissions advanced. Calif. Write for offer. No obligations. Puritan Rug Co., 552 Books asid Periodicals South Street. Waltham, Mass.. Dept. 389. For Inventors Auction, Bankrupt, Rummage Sales (New Credit Plan). Hypnotism Wins fame. fortune. eta, 25 easy lessons and Unbelievable Bargains. Enormous Profits everywhere. 218 -page Illustrated reference guide $2.00. "al beheading" Headquarters, t1s11108 So. Halsted, Chicago. (any Unpatented. Original distance), wonderful, $2.00. Science Institute. 81-430 Write Adam Fisheons ry Mfg. ('o., 205 al Waukee Avenue. Chicago. aEnright.nted oSt. uis, Ito. $10 daily silvering mirrors, plating and refinishing lamps, Unpatented Ideas Can Be Sold. I tell reflectors, autos, beds, chandeliers by new method. Outfits you make the sale. you hose and help Telegraph manual for beginners, learn at home, fifty Free particulars (Copyrighted). furnished. \Vrlte Gunmetal Co.. Are. D. Decatur. Ill. W. T. Greene, 80$ Jenifer Write rents coin. Runyon Printing Co. . Shelby, Indiana. Bldg., Washington. 1). C 'Superkeen! Amazing new patented magnetic blade Patents sharpener! Sharpens alt razor blades instantly. magically, Free Sly illustrated Cirrulars on Nesethought. I.K.B.Regstrcooperativeeedeetfopayment Iure. Selfrul- Paictrs by powerful magnetic force! New! A [violet ely different! Healing. Yogi Philosophy, Occult. Mystic and Salen- 953 Jenlfcr Bldg., Washington, La*yer.sayer. Sensational demonstration! Whirlwind Seller? Write for tine Books. Martens Publisher, Inc., Iturlington, Iowa. I). C. fen, N. C. Inventors. Pocket sample!" SuperE Dept. 1t-15, Salisbury. Use our special service for presenting Books, Magazines, Art Publications, in invention or patent to manufacturers. your money easily without or outfits. English. French. Co., Adam Fisher Mfg. Big made peddling Spanish. Photo novelties, ere. Catalog free. Villaverde 207-A e:nright, St. Louts, ado. Free particulars. E Elite, 3RE Elizabeth St.. N. Y. ('o., Box 1329, Havana, Cuba. $25.00 cash prize earls month succeed. awarded to inventors of Agents -We start you in business and help you unpatented Inventions, with right to No or needed. Spare or full time. You ing or photograph publish. Send draw- capital experience with description. Dynamic Mfg. can earn 550-0100 weekly. Write Madison Company, Business Opportunities First Nat'l ]tank Bldg.. Chicago. Co., 566 Broadway, New York. Rummage sales make $500.00 monthly. We start you. Make bi profits with ChInch111a riabbite. Real aloney- Experience Monarch, makers, \Vrite for facts. Itox 131, Conrad's Rinsch, furnishing everything. unnecessary. Denser, Formulas Desk 4. 609 Division, Chicago. Colo. 500 Formulas Sell By Matti -Books. novelties, bargains; and Big Catalog 20e. Ideal Book lust Out -New Patented Apron. No strings or strain- Particulars large Profits! (N), Park Ridge, Ill. Shop $20.00 a day esety day; oser 100% profit; commissions FREE? E-EIfeo, 525 Routh Dearborn, Chicago. offer. Stu -Put Co. , Dent. 502. daily. Write for free Print 250 Signs or Pictures St. Louis, Mo. an hour without press, type or machinery. Sample and partlrulars 10e. Straco, Health We Start You -Silvering mirrors; plating tableware. 101555. Springfield. Ohio. autoparts, headlights, etc.: reflnlshing metalware. chan- Tobacco or Free Book. Snuff habit cured or no pay. deliers, bedsteads, etc. Immense profits. Outfits fur- Start little Mall Order business, Madsen, cures?. Sent on trial. Willard $1.50 if nished. \VESCO, .11-1246, D, Wichita. Fans. 5A-74 Cortlandt Street, N. Y. Angeles, Calif. Company, Box 796, Los We Start You in Business. furnishing everything; men Amateur Cartoonists: stake weekly operating our "New money In spare Ilnte with and women. $35.00 to $100.00 new cartoon selling plan. Write Smith's Service, System Specialty Candy Factories." Few dollars start you ntrhee, Wash. Wen- Help and Instruction -Male home or small room anywhere. Booklet free. W. HILL - TER RAGSDALE. Drawer 129. East Orange, N. .1. Receive mall from everywhere. Stall order, agency'. Men -Women le Get Homework Up. U. S. Government Life Jobs. Agents -Best seller; Jem Rubber Repair for tires and propositions. Magazines, Listing 20e. Larsen Commence í95.110 to $158.00 month. Quick raise. Bros., 8-3410 North Ave., Chicago. work. Paid vacations. Steady tubes; supersedes vulcanization at a saving of over 800 per Common education sufficient. Ex- rent; 1t on cold. It vulcanizes itself In two minutes perience unnecessary. Sample examination coaching put full particulars- FREE. Write and and is guaranteed to last the life of the the or tube; sells Franklin Institute. Immediately - today. to every auto owner and accessory dealer. For partlrulars Cameras and Photography Supplies Dept. W-16, Rochester, N. Y. how to make big money and free sample. address Amazon Work for Uncle Sam. Get Government Jobs. Rubber Co., Philadelphia, Pa.. Dept. 601. Make money in Photography. women, 18 up. Men Learn quickly at hmne. Commence $95 to $158 month. Steady- $60-$200 a week. Genuine Gold Letters for store aIn- Spare or full time. New plan. Nothing like It. Ex- work. Short hours. Paid location. No layoffs. offer perience unnecessary. necessary. Pull un- slows. Easily applied. Free samples. Liberal to American School of Photography, Common education sufficient. Candidates agents. Letter Co., 441 B., North Clark, Dept. 5333, 3601 Michigan Avenue, Chlcage. reached without home. general Metallic leaving Full particulars and 12 - Chicago. page book -FREE. Write immediately. Franklin Institute, Today sure. Big money and fast sales. Every owner buys gold Ini- Dept. WI, Rochester, N. Y. tials for his auto. You charge 51.50; make $1.35. Ten Chemistry orders daily easy. Write for particulars and free samples, American Monogram Co.. Dept. 71. East Orange. N. J. Learn Chemistry at Home. Dr. T. O'Conor Sloane. Help Wanted noted educator and scientific authority, will teach you. Our Agents: Newest sensation Rhinestone Initial Fountain home study correspondence course fits you to take a Posi- 5100 wants one. No rom pet lt ion. per month In your home, folding and mailing Pens. Everylmdy $8.00- tion as chemist. See our ad on page 080 of this issue. culars. We furnish everything. cir- $15.00 dally In advance. Chalon Novelty Co., 602 Blue Chemical Instilute of New York, 16 E. Particulars and samples 30th St., Nesv 25c. Adams Mailing Service, 48 Adams Island, Chicago. York City. N. J. St., Irvington, Science and Invention for February, 1928 967

Help Wanted-(Continued) Musical Patents Wanted

Men Experience unnecessary; travel; snake secret in- Plano Jazz; teat he. all Styles of Jazzy Piano Playing, Inventions Commercialized. Patented or Unpatented. vest l gut Ions; retort s; salaries; expenses. Write \mer(can Negro Harmony, Hot iluso I:flrrts, Novelty Sweet ilnnuuny. Write Adam Fisher 511g. Co., 205 Enright, St. Louis, Mo. Foreign Detective Institute. 304. St. Louis. Stu. Information Free. Write "Piano Bill." 20711 Ossington, Toronto, Carrada. Mr. Inventor-If you have a patent or invention for Silvering Mirrors. French plate. Easily learned. im- sale, write Hartley, 38 Court St., Bangor, SI e. mense profits. Plans free. Wear \I lrror \Varies, le W. Exrelslnc Springs. Mo. Musical Instruments Distributors-No cam assing; no capital. Honery Itosets, Personal Pa. Viol I ns-Deep. Mellow. Soulful-on easy credit terms. Your to $12.5-$200 month and home High grade, ion.terful lost rmucnta of my own !mice. De- Handwriting Reveals Character. Practical guide Men-get Forest Ranger job; success. Send ink supple of osan or friend's writing for fish, etc. For details, write Norton. velopment of many years' expertness. Write fur book. furnished; hunt, trap, helpftl analysis of surprising fats. 25c isllrer). S. Pen - 265 Temple Court, Denier, C'ola. Ouster .5. Henning, 512 t'ultersity hull Jing, Seattle. (Vuohingtms. craft , l'osro's, Connecticut.

Help Wanted Male Novelties Photography Men Wanted who can sire car, to qualify for U. S. Chauffeur -Carrier (trot k driver) jobs; $141- Secret Corer, $3.50. Have you a Camera? Write for free sample of our big Government Cane Heroines I'kelele by Removing magazine. showing how to make better and earn I175 month. Write Instruction Bureau, Dept. 293, Arcade Broadway Music Co.. Bayonne, N. J. pictures Bldg., St. Louis, Mo. money. American Photography. 118 Camera llouse, Bos- ton, 17. Mass.

Old Coins Transfer Photographs to metal. china, etc. Patented How to Entertain Peewees. Makes beautiful miniatures. 1 real art. Lots California Gold, quarter size, 27c; half -dollar size, 53c of fun and profit. Anyone can do it. Outfit supplied to Plays, Musical Comedies and revues, minstrel music, Columbian nickel and catalogue, lee. Noncan Shultz, Box members only. Write about membership. Kyogr ioh blackface skits, vaudeville arta. monologs, dialogs, recita- 74Q Salt Lake City, Utah. Photo System, 21-D 1V. 17th St.. New York. tions. entertainments. musical readings, stage handbooks, make-up goods. Big catalog free. T. 8. Denison es. Co., 623 So. Wabash, Dept. 99, Chicago. Old Money Wanted Photo plays Wanted Wanted 52 to $500 Each paid for hundreds al Old or Odd Coins. $ S 5 For Photop lay Plots, Stories accepted any form, re- Insects Keep all old money. It may be sery raluable. Send Ilk for vised criticised. copyrighted, marketed. Estab. 1917. new Illustrated coin value (took 4x0. Guaranteed Prices. i took set free. (In Irersrsl Scenario Co., 223 Western & Cash paid for butterflies. insects. See Sinclair's Adver- Oct Posted. we pay Cash. Clarke Coln Company, 14 Santa Monica Bldg., Hollywood, Calif. tisement en page 960. Street. LeRoy. N. Y. Printing Outfits and Supplies Instruction Patent ,-i ttorneys Print your own cards, stationery. Arco tars. paper, err. Learn Chemistry at Home. Dr. T. O'Conor Sloane, Patents-Free valuable bask sent upon request-Save Complete outfits $8.85; Job Presses $11, $29; Rotary and authority, will read) you. Our noted educator scientific time-Fnnsar I :ketch or model for our free confidential $149 Print for others, big profit. All easy. rules sent. home study correspondence coot so fits you to take a position retort. Favorable report rendered only when we con- Write for catalog presses. type, paper. etc. Kelsey Com- as client1st. See our ad on page 880 of this issue. Chemi- scientiously believe your invention contains merit and is pany. F-6 Meriden, Conn. rul lost ltu;e of New York. Di E. 30th St.. New York City. of commercial value. American Industries, Inc., 224 Victor Bldg., Washington. D. C. Printing, Engraving and Maltigraphing Inventions Wanted Patents: Minh valuable information In our Illustrated hook on patents and trademarks sent free with sketch sheet. Send your Invention for Inspection and opinion. 200 Bond Letterheads, 81/2 a ll and 150 envelopes, $2, Inventions Commercialized. Parented or Unpatented. Write today. & 314-.1 Victor Bldg., Wash- 200 Bond Letterheads. 6 x 7 and 100 envelopes. $1. Mo. lt:yant Lorry, IN rite Adam Fisher Mfg. Co., 205 Enright, St. Louis, ington. I). C. Printed. Dollar (tills Will Do. Dept. Si. Hassler Print Shop, Portland. Indiana. Will buy approved Invention. Write W. L. Kendig, 416 Patents. Booklet free. Highest references. Best re- N. Duke Street, Lancaster, Pa. sults. Promptness assured Watson E. Coleman, Patent 200 Letterheads and 100 Envelopes, $1.10, postpaid. .\Homey, Washington, D. C. Obeunan Company, lion 1268. Chicago. Machinery and Tools Patents Secured. Easy terms. Inventors Service Bureau, Box 1648, Washington. Radio Concrete Building Block Ill :whines and Molds. Catalog' Richard E. Babcock, Patent Lawyer, Washington Loan free. Concrete Machine Co., 5 N. First St., St. Louis, Sto. & Trust Bldg.. Washington. D. C., Booklet. Cm-red your filter by using an adjustable me choke roil Range-30H to 10011 at 150 M. 1. $5.75. Trans- Monroe E. 6l filler, Ouray Bldg., Washington. D. C. formers. 050 colts. $7.23: 550 'volts. $3.50: 280 colts. $2.00. Patent I.a weer. Siechaul,al. Elect rice) Expert. Booklet Wrl'e for lists of eliminator kits and parts. Radio Parts Magic and Games and Priority' Record blank gratis. Sales Co., Orange. N. J. he Free with 525 order our large die box. Send 20e for Patents-Senu for form ''Ec Idence of monreption" to our large catalogue of tricks, puzzles, wigs, sensational signed and witnessed. Form, free schedule information free. Radio Equipment escapes. Oaks Stagical Cu., Dept, 549, Oshkosh, Wis. Lancaster and .\Ihvine. Registered Patent Attorneys in United States and Canada, 242 Ouray Bldg., Washington D. C. Direct Factory Sale. Wholesale prices. Tremendous Sav- ing,. Selling direct to you. Itere are some of our many Magical Goods Patents Procured: Trade Marks Registered-A roncisre- Reuss: 30 Henry Choke. 100 M.A. $2.19; 10 Henry Choke, benstce, experienced prompt sec ice for the protect Ion anu 400 5f. h. $5.48. Power Transformers for all kinds of Card tricks. Coin tricks. Ilypnot ism. Ventriloquism.' development of your ideas. Preliminary advire gladly fur- Eliminators and for all types of A.C. Tubes at Special Low and form 64 page book.. Cousplete guides 10c each. G. Fenner, nished without charge. Booklet of Information Prices. EVERY ITEM FULLY GUARANTEED. Prompt- B. Owen, 130 2401 Jefferson, Louisville, Ny. for di r losing Idea free on request. Richard ly shipped upon receipt of order. Send for free illustrated Owen 111dg., Washington, D. C. or 41-T Park Row, Near enta log today. Todd Electric Co. Inc.. (Manufacturers). York. 36 West 20th Street. Dept. It, New York City. Male Help Waited Unpatented Ideas Can Be Sold. I tell you how and help you make the sale. Free particulars. (t'uumWilted). Salesmen Wanted Firemen. Brakemen. Baggagemen (while or colored).1 Write W. T Greene. 809 Jenifer Bldg.. Washington, D. C. monthly. sleeping car. train porters (colnrel). 5150-$250 Punchboard and Sideline Salesmen. New Catalogue of Experience unnecessary. 897 Railway Bureau, East. St. Patents. TI ore counts in applying for patents. Don't Send sketch sure -selling assortments. New startling Candy Punch ltoll Louis, 111. risk delay In prolerting your ideas. or model sfachine. 823 Obtain a Combination worth SISO weekly. Ad -Lee, for instructions or write for Free honk. "How to Wabash, Chicago. Patent" and ' Record of Invention" form. No charge for Information on hose to proceed. Communications strictly Manufacturing eontident tal. Prompt. careful. ei5elmn see; lee. Clarence A. A Paying Position Open to representatse of character. O'Brien, Registered Patent 4ttorne5. Security Ilan)c Taf:e orders shoes-hosiery dlrert to wrarer. Gout (n- Models. Metal articles made to order. Experimenting from parent ofllcet, Wash- eon e. Permanent. Write now for free 'souk. "Getting Building (directly across street 6rn3 and quant by in odot Jon. Special tools. Parma Engineer- ington. D. C. See page 935. Ahead" Tanners Shoe Stfg. Co.. C St.. Boston. Mass. ing & Machine Works. Brooklyn Slat ion, Cleveland, Ohlo. 'Inventor's Advisor," Valuable Patentbook sent free. Punchboard Salesmen. 2 hours daily. $100 every week. Lowest prices. - Lobiner, 3 Park Row. New York. New line. Full commission on repeat bust tie... Catalog Free. Purl;an Novelty Co.. 14110 Jackson. Miscellaneous Patent, Trade -Marks, Copyrights. Reliable services by Chu, les. an experleneed prartitioner denoting personal attention so Beautiful Registered Bull Pups, $15. Bulldogs. 501 early rase. Inquiries Invited. Reference furnished. B. P. Rockwood. Dallas, Texas. Flshhume, Patent Lawyer. 525-D McGill Building, Wash- Song .Poems C. Forms to east Lead Soldiers. Indians, Marines, Trappers. ington, D. .Animals. 131 kinds. Send 10e for illustrated Catalogue. Patents obtained under Co-operative Payment flan. Song Poem Writers-Sens) for proposition. Ray IIIb- H. C. Srhierrke. 1034 -72nd St., Brooklyn, N. Y. Write for particulars. (V. E. heck. Registered Patent be'xr, D21, 2104 N. Keystone .\se., Chicago. Lawyer. 952 .tenifer Bldg.. Washington. D. C. Specimens of .Arizona minerals and Petrified Wood. R. Song -poem writers, write Sequoia Songwriters Service, Cederblom, Box 565, Mesa, Ariz. Get your own patents. Furors, complete Instructions $I. Sherman Branch. Los Angeles, California. Cott l ugbros. Campebll. Calif. Self-protection without a weapon. Unbeatable science for man or woman. Write. Stamp. John R. Kirk, 212- In Song -poem writers. Address Monarch, 236 West 55th, ADAM E. FISHER. Registered Patent Attorney. Deis. 133 New York. 9th Street, East Las Vegas. New Mexico. business 25 years; references; personal anent ion and promptness assured; Dept. E. 205 Enright, St. Louis, Mo. One of the biggest mails on earth. Sent to any address for 10c. Louisiana Distributing Service, Dept. X, Har- Song Writers on valuable In- mon. I.a. "Inventors' Guide" free request: gives formation and adrire for all who have original ideas or cartridge belts, horsehair Improvements. Frank Ledertmmn. Registered Attorney and xree -"Song Writers Guide." heaver, D24-0222 Goodell. Mexican Made pistol holsters, Green Day, Wis. articles. rattlesnake belt. list free. TEX-MEX Engineer. 17th Floor, Woolworth Bldg , Ness York. LEATHER CO.. 313 Esperson Bldg., Ilouston. Texas. Patents. Free ode lee. personal ser, Ire of registered At- Stamps and Be Independent. Receive 100 letters a day containing lomeee, former Patent o111ce Examiner. Booklet. Albert Coins 25c. and give a dollar art lele to every customer. Send 25c. Jambs. 728 1 Wrist er Itldg., Washington. for dollar artlrle and complete plan. No fake. Dept. 2, Stamps 100 All Diflerent 3 cents. S. I. (baker Stamp Western Moiling Service, 1636 r/ E. 6th Street, Long Patent Sense-As one of the oldest Orms In Amerlro we Company. Toledo, O. give Inventors, at lowest consistent charge. a service notc1 Reach. Calif well-known Patents of ex- for results. erideneed by many 1000 Mixed Foreign Stamps 25c. Phil Lundsted, Cape For Homemakers. Don't pay 2 different pelees for small traordinary value. Book. Patent -Sense. free. l.arey & Cottage. Maine. scanted Household Furniture. Send me store price and Lacey, 644 F St.. Washington. D. C. Earls. 1869. will make for one-half store cost. Neat, unpainted, post- paid. William Edward Gilbertson, Route 4, Box 8. Make $25 Weekly at homo, spare :Ime. writing short West Allis, Wis. stories for phnloplays. Experience unnecessary. Outline Telegraphy free. Producers League, 603, SL Lours. 31o. Telegraphy-Roth Morse and Wireless-taught thor- Models and Model Supplies oughly and quickly'. Tremendous demand. Big salaries. Patents Wonderful opportunities. Expenses low; chance to earn Ship Model Fittings: Steering Wheels. Capstans. An- ps.rt. Sehool established fifty rears. Catalog free. booklet. J. Fisher, Dodge's Institute, Stone St., Valpnralso, Ind. chors. Propellors. Send dime for A. Patented or Topal entetl. 1002 Eton tit, .sin., Royal Oak. \fieh. Inventions Commercialized. Write Adam Fisher Mfg. Co.. 205 Enright, St. Louis. Mn. Time is important in applications for foreign patents. Typewriters Moulds Send date United States Patent or Applirot ton, with names of countries desired for Free Information How to Typewriters, all standard makes. $10 up. Fully guarani. Moulds Making Toys. See ad on pago 1?Y. Miscel- Protect Your Patents. Chester Brown, 510 Van Buren teed. Free trial. Write for complete Illustrated listº, laneous. H. C. Srhlerrl:e. Street, Chicago. Northwestern Exchange, 121 N. Francisco Ara., Chtcaco. 968 Science and Invention for February, 1928 The AMAZING COMEBACK f HENRY FORD 'Turning defeat into victory the Detroit Automobile manufacturer has achieved the most amazing comeback in modern industrial history. Special Features in February Issue of NEW AGE Illustrated "Here's How" America is Royal Visitors in the Going Dry White House The How our past and present executives entertain crux of the present-day drink situation the royal is contained in a guests of the land who come to us comprehensi' a study of the from every social phase of prohibition. Are we drinking country in Europe, seeking a better more than formerly, or less? knowledge of American institutions. An Actor's Idea of Religion The Glory that Was Sherry's Noted'stage player, William Hodge, reveals his views on the church of today and tomorrow. More sumptuous than any eating place of its kind was Sherry's, popular with the America of a generation ago. A few of its memories by The Canvas Jungle Jerome, its well-known doorman. A story of circus life, by John Forbes, with the strange characteristics of our dumb friends of The Torch Bearers the jungle forming a fascinating background.

The beginning of a vivid historical series of From Parsonage to articles on our ever -apparent thirst for Grand knowledge, tracing it back to the "Dark Opera Ages," and carrying it along, generation by The interesting life and unusual career of generation, to the present day. Al me. Louise Homer. Why I Don't Believe in Companionate Marriage Where Is the Modern Metropolis Taking Us? The World's Biggest Job A Farmer Who Makes His Own Rain Have You Got a Name That's Hard to Remember? Why I Have Not Decided to Leave My Children Money My Big Fight to Live Within My Income and Fiction Service Departments MEXICO Food diet and health t L L s 7_11e,.A T E E A new story o modern t:,t . Sp kbruor,r . Mexico and of woman's Travel trips and information caprice in the face of danger. Care and upkeep of the car A IIANDFUL OF DIAMONDS A thrilling new mystery Child training novel. Insurance and financial facts BLOODY GROUND A new and tremendous story Home building and decoration of the Pioneer West. NEW AGE- // ILLUSTRATED Graybar Building, un I..o --- SINISTER SALVAGE On sale al your newsdealer on New York, N. Y. The strange story of a dere- I enclose $1.00 for a 6 -months' a baffling January 121h for 25 cents, or /triale subscrruaryiption.i Please- start it lict ship and , with th Febssue. mystery. send coupon for six months' Name THE CIRCUS MAN i trial subscription. /// Address City State S I. Let These Guides "; Solve ,Your Problems

\

_."

NAWA1 . HAWKINS WKI W O NWKIN fAWKIhSI, HAWKINS

6.EURI(A1 uLEURK EE(TflICA A CfRI(AL ' EEE(TRICAL GUIDE GUIDE GUIDE WIDE GUIDE GUIDE GUIDE CUIDE,TQ

r 2533i Y 497 ?: 997 :an -1. teá 166' Stoll ;'La. 5.. at yourfiner ends IN TEN HAWKINS ELECTRICAL GUIDES VOLUMES 3500 PAGES Si A VOLUME SEND NO MONEY-SEND ONLY THIS COUPON 4700 PICTURES Sf A MONTH Know the facts in Electricity. They mean more money and better you. Hawkins Guides tell you all you need to know position for THEO. AUDEL & CO. about Electricity. Every important electrical subject covered so you can understand it. Easy to study and apply. A complete, 65 West 23rd Street, New York City practical working course, in 10 volumes. Books are pocket size; Please submit me for free examination, HAWKINS flexible covers. Order a set today to look over. ELECTRICAL GUIDE (Price $1 a number). Ship at LEARN ALL ABOUT once prepaid, the 10 numbers. If satisfactory, I agree send you Experiments Dynamos Electric Ma- o $1 within seven days and to further mail Magnetism-Induction - - - you $1 each month until paid. chinery-Motors-Armatures-Armature Windings-Installing of Dynamos-Electrical Instrument Testing-Practical Management of Dynamos and Motors-Distribution Systems-Wiring-Wiring Name Diagrams - Sign Flashers - Storage Batteries - Principles of Alternating Currents and \Iternators - Tlternating Current 'Motors - Transformers - Converters-Rectifiers-.\lternating Current Systems-Circuit Breakers- Occupation \leasuring Instruments-Switchboards-Wiring-Power Stations-Installing -Telephone-Telegraph-Wireless-Itells-Lighting-Railways. Also many Modern Practical Applications of Electricity and Ready Reference Index Employed by.... of the ten numbers. SHIPPED FREE Not a cent to pay until you see the books. No obligation to buy unless Home Address you are satisfied. Send Coupon now-today-and get this great help library and see if it is not worth 5100 to you-you pay $1.00 a month for ten months or return it. Reference S. 1., Feb. A Sensationth Pen At a SensationaiPrice /

4"),*'. 10 1 DAY FOUNTAIN PEN FR E No matter what price you are prepared to pay for a supremely fine fountain pen, even up to $8.75, we ask TRIAL you to examine, compare and try the Wallace. If it Our special floes not 10 - day speedily convince you of its remarkable value and trial offer will prove to superiority, your money will be refunded immediately ,, you and that you can ob- without question. No fountain pen on the market ,r tain the most satisfactory is more carefully constructed, of better materials or , fountain pen you ever more perfectlj adjusted than the Wallace. owned at an exceptionally I;ecause of quantity production and inex- low price. pensive selling methods, it is offered to you at a small fraction of the price at which fountain pens of equal qual- ity are being sold. The Wallace ,Pen is the result of a lifetime experience spent in the manufacture of writing instru- ments and all materials used are of the highest quality. The barrel, cap and sec- tion are

EQUAL IN SIZE % To Any $7.00 or $8.75 Fountain Pen They are made of pure hard rubber, highly pol- ished. The clip anti self - filling lever are untarnishable DEALERS Stationery Store,, Drug Stores, ment Stores, etc. Depart- metal. The point is made of The Wallace Fountain Pen Is a popular prig ed fountain pen of which a long existing quality meets 14k solid gold. with a crystal - demand. Send for catalog and trade prices. hard iridium point which insures a lifetime of wear. Just as important SEND NO MONEY as the quality of the point is Juat and the per- till this coupon and the Wallace Fountain Pen to yet, al parcel past mitt he sent fect way it has been skillfully set in whirl] you C.O.D. for $1.50. plus postage. The money pay the postman will be eonºidered merely place and adjusted. will be entirely up to you to deride, as a deposit, it for 10 day,. nanher after you Fare tried the Wallace Pen or not vnu wish to keep not, Money wilt be eheerffoity refunded. It. If return It and picor J. A. WALLACE & CO., 239 Canal St., New York City J. B.WALLACE & Gentlemen: You may semi Inc your CO. postman $1.50. Wallace Fountain Pen. I will pay 239 plus postage, out delivery. Canal Street NOTE: 11'ben New York City remittance arenmpanies Name order. \1'atlare Fountain Pen w Ill be vent postage prepaid. If nithin 10 days it does not prove to be all we Every man. woman, Claim It to be - return it and we will refund .Address AGENTS hoy or girl is a punt money immediately. prospect. This ex- cellent value makes quicker sales and Mark X here bigger City profits. Send for a Wallace if you Prefer ladies' sine with Fountain Pen or write for sales plan ring on rap to he raffled on ladlea' ºautolr literature. hiin or Inet1'1 watch State S Uí 1