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40 NON TECMNICAL RADIO ARTICLES

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www.americanradiohistory.com Science and Invention for fl pri1,1926 1073

Y Will Train You ' a BigtayJob!

Look What These Cooke Trained Men Are Earning It's a shame for you to earn $15 or $20 or $30 Makes $700 in 24 a week, when in the same six days as an Elec- Days in Radio trical Expert you could make $70 to $200 -and "Thanks to your interesting do it easier -not work half so hard. Why then Course I made over $700 in 24 days in Radio. Of course, this remain in the small -pay game, in a line of work that offers no chance, is a little above the average but I run from $10 to $40 clear no big promotion, no big income? Fit yourself for a real job in the profit every day, so you can I'll show you how. see what your training has great electrical industry. done for me." FRED G. McNABB, 848 Spring St., Atlanta, Georgia $70 to $80 a Be an Electrical Expert week for Jacquot "Now I am specializing in Earn $3,500 to $10,000 a Year Auto Electricity and battery Today even the ordinary Electrician -the "screw driver" kind -is making money-big work and make from $70 to trained man man who knows whys wherefores of $80 a week and am just getting money. But it's the -the the and started. I don't believe there Electricity -the Electrical Expert -who is picked out to "boss" the ordinary Electricians is another school in the world boss the Big Jobs -the jobs that pay $3,500 to $10,000 a Year. Get in line for one like yours. Your lessons are -to of these "Big Jobs." Start by enrolling now for my easily learned, quickly grasped, right - a real joy to study." Spare -Time Home -Study Course in Practical Electricity. ROBERT JACQUOT, 2005 W. Colorado Ave. up-to- the -minute, Colorado Springs, Golo. Get Started Now-Mail Coupon Age or Lack of Experience I want to send you my L. L. Cooke, Chief Engineer No Drawback Electrical Book and $20 a Day for Proof Lessons, both Chicago Engineering You don't have to be a College Man; you don't have These cost you Schreck to be a High School Graduate. As Chief Engineer of nothingFree. and Works "Use my name as a reference theChicago Engineering Works, I know exactly the you'll e n j o y 2150 Lawrence Ave.. and depend on me as a boost- kind of training you need, and I will give you that them. Make the Dept. 24, er. The biggest thing I ever training. My Course in Electricity is simple, start today for a / Chicago did was answer your adver- thorough and complete and offers every man, re- a bright future experience the in Electricity. tisement. I am averaging bet- gardless of age, education, or previous Send in $500 a month from chance to become, in a very short time, an "Electrical Ex- ter than from $70 to $200 a week. Coupon my own business now. I used pert," able to make NOW. - to make $18.00 a week." No Extra Charge for Electrical A. SCHRECK, Phoenix, Arizona Working Outfit With me,you dopractical work -at home. You start right in after your first few lessons to work at your Plant Engineer- profession in the regular way and make extra money in your spare time. For this you need tools, and I give them Pay raised ISO% to you -6 big complete working outfits,with tools, measur- "I was a dumbbell in electric- ing instruments, and a real electric motor -6 outfits in all. ity until I got in touch with you Mr. Cooke, but now I Your Satisfaction Guaranteed So sure am I that you can learn Electricity -so sure am I have charge of a big plant in- that after studying with me, you, too, can get into the "big cluding 600 motors and direct money" class in electrical work, that I will guarantee un- a force of 34 men -electri- der bond to return every single penny paid me in tuition,if, cians, helpers, etc. My salary when you have finished my Course, you are not satisfied it has gone up more than 150 was the best investment you ever made. And back of me %." in my guarantee, stands the Chicago Engineer- L. L. COOKS. The Man GEORGE ILLINGWORTH, ing Works, Inc., a two million dollar institution, 63 Calumet Road, time assuring to every student enrolled,not only Dept. 24, Who Makes Holyoke, Mass. a wonderful training in Electricity, but an un- 2150 Lawrence "Big-Pay" surpassed Student Service as well. Ave., Chicago Men Send meat once without obligation your big illustrated book and corn - 4/IP plete details of your Home Study Course in Electricity, including your t outfit and employment service offers. Name

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e,..,,1,,,,,,,,,,,,,,,,,,,,,e,1,,,,,,,,,,111111,,,,_ \ p\\\" \\\ Vol. XIII. \0 April, 1926 1 Whole No. 156 V44 No. 12 , !\ m,,,,,,,,,,,..,,.,,,,,,,,,,,,,,,,.,,i FORMERLY ELECTRICAL EXPERIMENTER COMBINED WITH "THE EXPERIMENTER" Member Audit Bureau of Circulations EDITORIAL & GENERAL OFFICES: 53 Park Place, New York City GENERAL ADVERTISING DEPT.: 53 Park Place, New York City Publi bed by Experimenter Publishing Company. Inc. (H. Gernsback, Pres.; S. Gernsback, Treas.; R. W. DeMott, Sec'y). Publish INVENTION, RADIO RNACIONAL, RADIO Nand AMAZING STORIES EDITORIAL STAFF , CONTRIBUTING EDITORS Astronomy- Dr. Ernest Bade, Ph.D. HUGO GERNSBACK, Editor -in- Chief. Dr, Donald H. Menzel, Ph.D., Ohio Radio State University. Sylvan- Harris. H. WINFIELD SECOR, E. E., Isabel M. Lewis, M.A., of the U. S. Leon L. Adelman. Managing Editor. Naval Observatory. Magic and Psychic Phenomena- Entomology and Allied Subjects- Joseph Dunninger. DR. T. O'CoNoR SLOANE, Ph.D., M. A., Dr. Ernest Bade, Ph.D. Joseph F. Rion. Associate Editor. Physics- Edward Merlin. Dr. Harold F. Richards, Ph.D. Foreign Correspondents- JOSEPH H. KRAUS, Field Editor. Ernest K. Chapin, M. A. Dr. Alfred Gradenwitz, Germany. Dr. Donald H. Menzel, Ph.D., Ohio Dr. H. Becher, Germany. A. P. PECK, Assoc. I. R. E., State University. C. A. Oldroyd, England. Radio Editor. Automotive Subjects- S. Leonard Bastin, England. Tom C. Plumridge. Count A. N. Mirzaoff, France S. GERNSBACK, Wrinkles Editor. George A. Luers. Hubert Slouka, Czecho- Slovakia. Chemistry- P. C. van Petegem, Holland. M. ESSMAN, Art Director. Raymond B. Wailes. Richard Neumann, Austria. ma mmaa11mi,,m,m, 1m,m m = ®mom, m maa,111 IN OUR NEXT ISSUE 4 Contents for . April Hot Gas for Dirigibles. Editorial 1081 Awards In the Rat Trap Contest... 1107 By Hugo Gernsback. Model 'Department 1108 The new art of heating gas for dirig- Safety On Submarines 1082 Model Bot'.er 1109 ibles is a most interesting one and an Medical Frauds 1084 Everyday Chemistry 1111 will describe in de- By Joseph H. Kraus. By Raymond B. Wailes. aeronautical engineer Electric Snow Eliminator 1085 tail the methods and apparatusPP used. By Jay Kay London. Experimental Chemistry 1112 "Antinoe" Photos Cabled Across Experimental Electrics 1114 Are Ants Organized? Atlantic 1086 Junior Electrician 1116 By H. Winfield Secor, E. E. Cooling and Humidifying. System 1118 and a description of Can the Dead Be Reunited? 1088 They are indeed Utilizing Electric for Power..1118 their home life will be found, together By Hugo Gernsback. Fans il- Electro- Chemistry Restores Ancient Is There a Battery in Your Mouth..1119 with various interesting and instructive Bronzes 1090 By Clyde E. Volker:. lustrations. New Steel Resists Great Heat 1091 Mysterious Jar of Water 1119 By C. A. Oldroyd. h Railroads. The New Cosmic Ray 1092 SafetySafy on the Rild Greatest Three Figure Number 1093 How -to- Make -It Department ...... 1120 Did you know that a train, when prop- By Hubert Slouka. Readers' Forum 1121 -I erly equipped, can be automatically Under -Sea Volcanoes 1093 Wrinkles, Recipes and Formulas, ..1122 stopped even though traveling at a speed By Ernest Brennecke. Edited by S. Gernsback. in the engineer New Plane Seeks Altitude Record 1095 Latest Radio Broadcast News 1124 =I of 60 miles an hour, case By William P. Sullivan. pass a stop signal? WRNY For New York Visitors 1125 should thoughtlessly Distribution of Electricity 1095 By Charles D. Isaacson. be Seen in Daytime New Electric Refrigerator 1096 The Radio Constructor 1126 Can Stars New Photograph Accessories 1096 By A. P. Peck, Assoc. I. R. E. From a Deep Well? The A Five Tube Tuned R. F. Receiver 1128 I Stor of Coal 1077 This is an old superstition and reasons By J. E. Byron. A Highly Efficient Six Tube Re- Awards In the Matchcraft Contest.1098 ceiver 1129 for its existence as well as its fallacy will By L. Adams Telephone Amplifierp ' er For the Deaf be given by an astronomer. p Radio Oracle A Musical Talking Machine 1101 1130 Patents Photos From the Scientific World 1102 Latest 1131 How are Movie Sub - Titles Scientific Humor The Month's Science News Thus- 1132 Made? trated 1103 Oracle 1133 This is a most interesting phase of mo- By George Wall. Radio Broadcast Calls 1152 tion picture work that is not very well Tarrano The Conqueror 1104 Radio Wrinkles 1150 known. In an interesting article, you will By Ray Cummings. Patent Advice 1140 this work. cp Magic by Dunninger 1106 Edited by A. P. Peck. find many details of , ,,, . . w,.m . ll ,.,,...,.., ,,,,,,,,.. ,,..aaaa. - . ..,...... - ..-o.-n. ---.aaaaami...... ,. ,,..,w. ...,,,,, ,, HOW TO SUBSCRIBE FOR "SCIENCE AND VIEW and AMAZING STORIES. Subscriptions may - Hder and remittance for a renewal. delivery of INVENTION. Send your name. address and re- be made in combination with the other publications the magazine is stopped. mittance to Experimenter Publishing Co., 53 Park Just menticned at special reamed club rates. Send CHANGE OF ADDRESS: Notify us as far in ad- Place, New York City. Checks and money orders postal for club rate card. Subscriptions start with vane as possible, giving your old address as well should be made payable to Experimenter Publishing the current issue unless otherwise ordered. . - as the new one to which future magazines are to Co., Inc. Mention the name of the magazine you ON EXPIRATION of your subscription we enclose go. It takes several weeks to make an address are ordering inasmuch awe also publish RADIO a renewal blank in our last number to you, and change or our records. NEWS, RADIO INTERNACIONAL, RADIO RE- notify you by mail. Then unless we receive your a maaa-,a manaa,un ,,,,,.oartam , , ,,,,, ,, ..... um ,,,,,,,,,,,,, ,.,, , ,n,,, .,,, ,,,,,,,,,,, m .a...... ,am... m..,,,nnm,mmm, =I is published on the INVENTION, 53 Park Place,-New -York City, N. Y. San Francisco. Calif. Title Registered SCIENCE AND INVENTION be at the Pat- 10th of each month. There are 12 numbers per year. Unaccepted contributions cannot returned unless net Office. Copyright. 1926, by E. P. Co., Inc.. Subscription price is $2.50 a year in U. S. and pos. full postage has been included. ALL accepted con - N York. e of Magd a re are paid for on publication. copyrewighted and sessions. Canada and foreign countries $3.00 a year. tributtons ThhamContentsust not be reproducetis Withnzine at =I U. S. coin as well as U. S. stamps accepted (no for- - - giving full credit to the publication. SCIENCE or Single conies, 25 cents each. SCIENCE AND INVENTION. Monthly. Entered as AND INVENTION is for sale at all newsstands in eign coin stamps). class May 10, Post A sample copy will be sent gratis on request. second matter 1924, at the Office the United States and Canada. European Agents, Y., March 3, - ipp1= All communications and contributions to this jour- at New York, N. under the net of 1$79. S. J. Wise Et Cie, 40 Place Verte, Antwerp, Bel - nal should be addressed to Editor, SCIENCE AND Additional entry at Long Island City, N. Y., and giuni. New England Advertising Representative Western Advertising Representatives Pacific Coast Advertising Representatives Kansas City Advertising Representatives Finuras & McClure A. I. Norris Hill Co. Davies II T. F. Magrane III. Hearst Blda.. San & Dillon Park Square Bide.. Boston. Mass. 720 Cass St., Chicago, Francisco, Cal. 15 W. 10th St.. Kansas City, Mo..

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www.americanradiohistory.com Science and Invention for April., 1926 1075

O.C.MILLER Director of Extension Work

to Prove You Can Learn at Home in Spare Time! We have invented a new, simplified way to teach Drafting -the first real improvement in Drafting home -instruction in history. We want you to see it, try it- without one penny of cost or obligation. We want to WILL MAKE show you how we get away from the copying methods used in the past. See this Contract how we make you think, solve problems, do actual drafting room jobs from the first lesson! with You- DraftsmenWanted! $60 to $125 aWeek! 70,000 fine jobs advertised last year. Get ready to fill one. Get out of the rut. Make When you enroll for our home -training something of yourself. Plan your future in in Drafting, we agree to give you: Drafting. Even if you have only common 1. Complete Drafting training, by the schooling, even if you know nothing of new Practice -Method. Drafting, we guarantee to make you a real 2. Professional Drafting Outfit, as ill- Draftsman or to refund your money! ustrated. Special surprise offer right now to the first AMERICAN SCHOOL 3. We will help you get a good Drafting 500 men who answer this reduced -ilk Million Dolle, position at a substantial increase in ad- Electricity needs Drafts- Educational InelilutWq pay. price, easy terms. Coupon brings complete men who know Electrical principles as well as gen- 4. Or we'll refund every cent of your information. eral Drafting practice. I money. A -new, rapid, simplified training give you this training. Copying drafting lessons prepares you to be only a "tracer." This new "Job -Meth- 452 od" gives you actual drafting -room jobs Director Extension Work in a new one -step -at -a -time way. With pictures which you can understand almost without reading the "lessons." And that WIN SUCCESS is why the American School- School, a million trained The American THRU DRAFTING Draftsmen can qualify for a good job at dollar No -Profit Educatioi...l Insti- Drafting is easy, fascin- tution now offers men a double ser- ating work. Short hours. big pay when they graduate. vice- training for a specific job, then Big Pay. And the finding the job. For one small price, Draftsman is always are in line for promotion BIG-PAY Branches on terms of only $5 a month, you for executive posi- The big money in Drafting goes to The demand for Drafts- now assured of definite benefits, both tions. This men experienced in con- train- men who specialize in Machine Design. crete and structural steel in position and salary. Write for com- ing is Complete. or Electrical Drafting, or Architectural plete information It includes high- work is enormous. Many -today! Brood subjects. Drafting, or Structural, or Automotive. big -pay positions open. FREE (if you need It is not enough merely to know general Draft- them) and all ing practice. You must know how to calculate Job Service! the Engin- and design and plan original work. Yoit need eering and many Engineering The American School M- a- t -h -e- subjects to fill the kind of a now offers its students maties Drafting position that pays $60 to $125 a week. and graduates, with- Drafting The American School now includes this special- Experts. ized training in its Drafting course. out cost, the services require. of an efficient Employ- ment Department Coupon keeping in constant Brings 3 Lessons touch with em- FREE! Get them. Test your own ability to ployes of Drafts- learn Drafting and get ready for men all over the a fine job and big pay. Coupon United States. We No machine ran he built also brings surprise offer, and until the Draftsman first have placed hun- complete information about your My dreds of men in gr:at Auto factory builds it cn paper. opportunities for success in employs Draftsmen who you for good big -pay Draft - training prepares Drafting. Mail Today! specialize in Automotive this i n g positions. It work -men who design We've made this bodies, plan engines, etc. training so com- plete, so practical, so easy to master, that our students Draftin are bound to make good. And, so, be- tessons 111W cause the demand ' for real Draftsmen Costly Drafting O. C. MILLER. Director of Extension Work continues to exceed the supply, and be- Outfit Given! AMERICAN SCHOOL cause this training Fine, imported instru- D -426, Drexel Ave. & Seth St, Chicago. actually prepares ments like these help Dept. men for good Draf t- 3 Lessons, Sob and Raise offer, eore- world seen you learn Drafting Rush Free Drafting Never has the ing positions, we quickly plete information, money -back guarantee. etc., to prove I anything like the building back It a Free and easily. These 1, can become a real Draftsman at home in spare time. boom of today. This has with standard quality, full created enormous demand Employment Ser- size instruments, board, Name for real Draftsmen. vice. table, triangles, T 0. Dept. D-426 square. ink, protractor, Street No Drexel 58th St. etc., given to every stu- EXTENSIONt WORK AMERICAN SCHOOL CHICAGO dent without extra cost. City State

www.americanradiohistory.com 1076 Science and Invention for April, 1926

INDEX TO ADVERTISERS

A Page E Page M Page Page American Correspondence School E. I. Company 1078 Mead Cycle Company 1161 Polk & Co., R. L. 1151 of Law 1142 Elto Outboard Motor. Company 1163 Metal Arts Co. 1163 Porter Chemical Company 1138 American School of Correspond- Erie Fixture Supply Co 1161 Metal, Cast Products Co. 1153 Practical Mechanics 1157 ence 1152, 1075 Evans, Victor J 1143 Mellinger Tire & Rubber Co., 1154 Press Company 1163 American Technical Society ...1154 P Metropolitan Motion Pic. Co. 1161 American Tel. & Tel. Co: , . , ,1147 Meyer Both Company 1138 R Anita Company 1161 Fawcett Publications, Inc. 1155 Mid-West Radio Corp. 1138 Radio Association of America..1144 Arrow Battery Co. 1151 Federal Mail Order Corp. 1163 Miller, Monroe 1142 Radiogem Corp., The 1148 Artcraft Studios 1163 First Hawaiian Conservatory of Modelmaker 1161 Radio Specialty Co. 1139 Atlas Moving Picture Co. 1157 Music 1163 Modern Engine & Supply Co 1161 Randolph & Company 1140 Audel & Co., Theo. Fisher Mfg, Co., Adam 1142 Munn & Company 1142 Franklin Institute . 1149 Inside Back Cover Mussehl & Westpal 1142 s B e S & H Engineering Co. 1157 General Electric Company 1149 N Sargent, L. L. I142 Baby Calculator Sales Co. 1154 Gerold Company, The 1161 Balda Art Service 1165 National Electrical School 1136 School of Engineering 1157 Gilson Slide Rule Co- 1165 National Carbon Co .1135 Shipman -Ward Co., Belmont Hotel 1154 Givens Chemical Company Bliss Electrical School 1163 1138 Natural Body Brace Co 1165 Inside Front Cover Bogue Institute for Stammerers 1152 H Nelson Mfg. Co. 1154 South Bend Lathe Works 1138 New England Novelty Co. 1163 Spors & Co., F. 1147 Bremer -Tully Mfg. Co. 1146 Hardin -Lavin Co. 1152 1163 Brinkler School of Eating 1161 High School Study Bureau 1159 New Method Mfg. Co. 1165 Stauffer, Mack Buescher Band Instrument Co 1150 Hobart Bros. 1146 New York Electrical School 1144 Buffalo Wire Co. 1161 Hotel Times Square 1156 North American Institute 1080 T Bureau of Inventive Science 1077 Tamblyn School 1157 I O C Inkograph Co., Inc. 1153 International Body Works ,,, 1161 O'Brien, Clarence A. 1141 U Chemical Institute 1079 Ogilvie Chicago Engineering Works 1073 International Correspondence Publshing Co. 1165 Universal Sales Co. 1155 Schools.... 1138, 1150, 1155, 1165 Open Court Publishing Co. 1159 University of Chicago 1161 Chicago Solder Company 1153 Orr, T. V. Chicago Technical College 1152 International Studios 1157 1168 University Extension C o n - Irwin Aircraft Company 1154 Owen, Richard B. 1140 servatory 1165 Chicago Tenor Banjo Institute 1150 Ozment, C. J. 1155 Clarkson, David B. 1154 J Coleman, Watson E. 1142 w Conn, C. G., Ltd. 1152 Johnson, Smith & Co. 1137 P Washington Jewelry Co. 1146 Consrad Co., Inc. 1162 L Page Davis School 1157 Washington School of Art 1163 Coyne Electrical School Lacey & Lacey 1140 Parker, C. L. 1142 Washington Show Card School 1159 Back Cover Lancaster & Allwine 1140 Parks Ball Bearing Machine Western Airplane Corp. 1165 LaSalle Extension University 1142 Co. 1159 Witte Engine Works ,,, 1155 D Lewers, R. J. 1155 Perfect Sales Co. 1165 World Battery Co. 1150 Davis Co., E. M. 1163 Liggett & Myers Tobacco Co. 1151 Photion Electric Corp. 1152 Dawson Real Estate Corp. 1155 Pittle & Co., Charles 1165 Douglas, Lyle 1150 Mc Plapao Company 1159 Y Drake Co., F. J. 1163 McGraw -Hill Book Co.. , ,1145, 1150 Polachek, Z. H. 1142 Young Typewriter Company...1161

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www.americanradiohistory.com Science and Invention for Apri1,1926 HOW TO INVENT- WHAT TO INVENT and What to Do About Protecting and Selling An Invention

and market them ahead of you, let this great LTHOUGH the fact has been -How to develop your imagination universally recognized that In- Course in Inventive Science help you. Get -How to develop your ideas the advice and help of the fifteen famous vention is governed by a few -How to get the facts you need for inventors inventions who tell you the secrets of inven- simple, easily acquired, funda- tion which you MUST know to be success- -How to keep legal records of ideas ful. mental principles, no one ever thought -How to use scientific principles of of putting these principles in black mechanics This is the first course in practical inven- tion that has ever been devised. In and white so that everybody interest- -How to avoid wasting time on im- simple, practical inventions easy -to- understand language you are told ed in invention could read them. In how successful inventors ; -How to apply for a patent work you learn spite of the fact that Thomas A. Edi- to organize how to think along inventive lines, you learn -How a company the short his famous statement that to protect -cuts to successful invention ; you son made -How your rights learn how invention should be taugh- as a sci- -How to market a patent to use the secrets of invention and hundreds of other vitally impor- that convert a simple little idea into money. ence, thousands of people continued tant facts which EVERY successful No one step in invention has been omitted. to work blindly, doggedly, haphazard- inventor knows and uses. Everything you want to know about inven- ly to perfect their ideas. tion- developing your ideas, securing in- formation you need, how to apply But now anyone can learn how to invent. which mustt be solved and a fact of me for Fifteen famous inventors have at last given chanics patents, how to protect your rights, how to or science which solves the problem sell your invention to the world the laws and principles of In- So, although you may never have -are taken up step though by step, so that when you have ventive Science. They have shown every of it just this way, every time you a completed solve the course you have a wealth ambitious man and women how to invent. problem in you daily life -at home, travel- of informa- They are teaching Invention ex- tion worth thousands upon thousands of ing, or in business -you are dollars. actly as other peopleareteaching an inventor ; you use the prin- law, medicine, bookkeeping. In- ciples of thought and action stead of spending years groping which govern the Science of In- FREE New Book on blindly, instead of wasting your vention ! Inventive time in useless, heartbreaking You can see, therefore, how Science drudgery, you learn how to com- easy it is for you to develop A wonderful new book has just come plete your ideas quickly and what your natual instinct to "fix from the press that tells you all about the to do about them when they are things." The same processes of Science of Invention. It tells you how to completed. You learn how to thought that almost instinctively avoid the pitfalls that have brought failure think so you are sure to succeed. told you to fix a rattling win- to thousands of would -be inventors. It dow with a wedge can be so well tells you how to learn the secrets of prac- developed that you can learn to tical invention, which famous inventors Everybody Invents invent other things almost as discovered only after years of heart- break- easily and quickly. You know, ing effort and discouraging For a long time it Raymond F. Yates, mistakes, and was com- who with fourteen too, that every invention is it tells you how to do this in only fifteen monly believed that every in- other famous inven- tors now makes it made only by thinking inven- minutes of your spare time each day. This vention a easy was matter of pure for you to learn tively. And every inventor is book will be sent you free if you inven- luck result of some happy how to invent in are -the your spare time at agreed that the principles of In- tively inclined, or if you have some idea in inspiration that suddenly home. flashed ventive Science are so simple, so mind for an invention. We cannot afford through a man's brain, and easy to learn that anyone, to send this book to those who are merely which made him fabulously rich without the regardless of training or education, can curious or to slightest effort or thought. children. If you are genuinely But you can develop himself to become a successful in- interested, however, be sure prove for yourself this is to send for that not so. You ventor! this book today. Write your name can prove for yourself that invention is the and ad- With every new advance, with every dress on the coupon below or send a post- result of thinking and action along definitely new discovery that the world experiences, card NOW! exact, scientific lines. This bureau is not connected more problems are coming up-and more in any way with patent attorneys or manu- Suppose when you went home tonight inventions are needed to solve these prob- facturers. you found Our only work is to help ambi- a window rattling. Through lems. Now, as never before, are new inven- tious men and your mind would flash, almost instinctively, women to develop their in- tions wanted, and the world will pay a for- ventive ability -to become successful in- a regular order of thoughts which charac- tune to the man or woman who gives it just ventors. terize the coneption and completion of one of the inventions it needs. every invention the world has ever, known. Even little ideas can bring you a for- First, you would recognize a problem to be tune. Eberhard, who invented the rubber Bureau of Inventive Science solved -the rattling of the window. Then on the end of a pencil, has been paid hun- Dept. 74, Wisner Building, Rochester, N. Y. you would think of several principles of dreds of thousands of dollars for his simple science or mechanics which would solve idea. The man who invented the metal your problem. You might think of the tip for shoelaces, the man who conceived BUREAU OF INVENTIVE SCIENCE scientific fact that if you poured water on the idea of the "humped" hairpin, the man Dept. 74, Wisner Building the frame the wood would swell and who developed the metal tape measure, Rochester, New York tighten the window. You might think of all have achieved success and wealth as using a nail. But what you most poobably great or greater than the inventors of large I am over 18 years of age, and am in- would do would be to use the oldest me- machinery. terested in your Course in Inventive chanical principal known to man, the Science. Please send me your Free wedge. L earn How to Invent at Home Book about the Course. What Invention is If you would like to develop your natural Name inventive ability along money- making lines, Address Brought down to its simplest terms, that instead of trifling with ideas -if you is exactly the way every invention has been would like to DO something about your City State made-combining two ideas ; a problem ideas instead of letting someone else patent ------

www.americanradiohistory.com 1078 Science and Invention for April, 1926

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www.americanradiohistory.com Science and Invention for April, 1926 1079 BURIED TEASUIE can still be found in CHEMISTRY Good Chemists Command High Salaries and you can make yourself What Some of Our independent for life by un- Students Say of This Course : I have not written since I received the big earthing one of chemistry's set. I can still say that it far exceeded my anticipations. Since I have been studying with your school I have been appointed chemist for yet undiscovered secrets. the Scranton Coal Co. testing all the coal and ash by proximate analysis. The lessons are helping me wonderfully; and the interesting Do you remember how the tales of pirate gold used to fire way in which they are written makes me wait patiently for each lesson.- MORLAIS COVE- your imagination and make you want to sail the uncharted ENS. seas in search of treasure and adventure? And then you I wish to express my appreciation of your prompt reply to my letter and to the recom- would regret that such things were no longer done. But that mendation to the General Electric Co. I in- is a mistake. They are done and everyday on tend to start the student engineering course at -today -not the works. This is somewhat along electrical desert islands, but in the chemical laboratories throughout lines, but the fact that I had a recommenda- tion from a reliable school no doubt had con- your own country. Quietly, systematically, the chemist works. siderable influence in helning me to secure the His work is difficult, but more adventurous than the blood- job. -H. VAN BENTHIIYSEN. deeds So far I've been more than pleased with curdling of the Spanish Main. Instead of meeting an your course and am still doing nicely. I hope early and violent death on some forgotten shore, he gathers to be your honor graduate this year. -J. M. wealth and honor through his invaluable to hu- NORKUS, JR. T. O'CONOR SLOANE. contributions I find your course excellent and your inxtruc- A.B., A.M., LL.D., Ph.D. manity. Alfred Nobel, the Swedish chemist who invented tien, truthfully, the clearest and best assem- Noted Instructor. Lecturer and bled I have ever taken, and yours is the fifth Author. Formerly Treasurer Ameri- dynamite, made so many millions that the income alone from one I've studied.-JAMES J. KELLY. can Chemical Society and a practical his bequests chemist with many well known provides five $40,000 prizes every year for the From the time I was having Chemistry it achievements to his credit. Not advancement of science and peace. C. M. Hall, the chemist has never been thus explained to me as it is only has Dr. Sloane taught chemis- now. I am recommending you highly to my try for years but he was for many who discovered how to manufacture aluminum made millions friends, and urging them to become members years engaged in commercial of such an organization. -CHARLES BEN- through this discovery. F. G. Cottrell, who devised a valu- JAMIN. chemistry work. able process for recovering the waste from flue gases, James I shall always recommend your school to my Gayley, who showed how to save enormous losses in steel friends and let them know how simple your lee - sons arc -C. J. AMDAHL. manufacture, L. H. Baekeland, who invented Bakelite -these I am more than pleased. You dig right in are only a few of the men to whom fortunes have come from the start. I am going to get somewhere with this course. I am so glad that I found through their chemical achievements. you. -A. A. CAMERON. I use your lessons constantly as I find it more thorough than most text books I can secure.-WM. II. TIBBS. Now Is the Time to Thanking you for your lessons. which I find not only clear and concise, but wonderfully interesting. I am -ROBT. H. TRAYLOR. Study Chemistry I received employment in the Consolidated Gas. Co. I appreciate very much the good Not only are there boundless opportunities for amassing service of the school when a recommendation wealth in Chemistry, but the profession affords congenial was asked tor. -JOS. DECKER. employment at good salaries to hundreds of thousands who merely follow out Its present applications. These appli- cations are innumerable, touching intimately every business and every product in the world. The work of the chemist can hardly be called work at all. It is the keenest and most enjoyable kind of pleasure. The days in a chemical laboratory are filled with thrilling and delightful experimentation, with the alluring prospect Of a discovery that may spell Fortune always at hand to spur your enthusiasm. 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www.americanradiohistory.com 1080 Science and Invention for April, 1926

Afraid o}'My OwnVoice But I Learned to Dominate - Others Almost Overnight SUDDENLY the boss turned to me and my bashfulness, my lack of poise and retiring, self- conscious man to change almost over- queried, "Well, Conroy, what's your inability to express myself. night into a popular and much applauded after - dinner speaker. Thousands have accomplished opinion ?" They all listened politely for me just such amazing things through this simple, easy, to speak and in the silence I heard my thin, In 15 Minutes a Day yet effective training. wavering voice stammering and sputtering And then suddenly I discovered a new a few vague phrases. Like easy method which made Send for this Amazing Book This new method of training is fully described a flash Stoddard inter- me a powerful speaker al- in a very interesting and informative booklet rupted me and launched on What 15 Minutes a Day most overnight. I learned which is now being sent to everyone mailing the a brilliant description of Will Show You how to bend others to my coupon below. This book is called, How to Work Wonders With Words. In it you are shown how his plan. All set spell- How to talk before your club or will, how to dominate one to conquer stage fright, self- consciousness, timid- bound as he talked -my lodge man or an audience of ity, bashfulness and fear-those things that keep views were forgotton -and How to propose and respond to thousands. Soon I had you silent while men of lesser ability get what yet I have been studying toasts they want by the sheer power of convincing How to address Board Meetings won salary increases, pro- speech. Not only men who have made millions the problem for months How to tell entertaining stories motion, popularity, power. but thousands have sent for this book -and are un- and I was prepared to How to make a political speech Today I always have a stinting in their praise of it. You are told how to suggest a sound, practical How to make after -dinner speeches ready flow of speech at bring out and develop your priceless "hidden knack"-the natural gift within you -which will plan which I knew would How to converse interestingly my command. I am able How write win for you advancement in position and salary, solve all our difficulties. to letters to rise to any occasion, popularity, social standing, power and real suc- How to sell more goods cess. You And that was the way it Flow to train your memory to meet any emergency can obtain your coov absolutely free by always was -Ilwas always How to enlarge your vocabulary with just the right words. sending the coupon. being given opportunities How to develop self- confidence And I accomplished all How to acquire a winning person- to show my ability and ality this by developing the Now always failing miserably. How to strengthen your willpower natural power of speech I was bashful, timid, and and ambition possessed by everyone, How to become a clear, accurate nervous -I never knew thinker but cultivated by so few Sent how to express myself, How to develop your power,of con- -by simply spending 15 how to put my ideas centration minutes a day in the across. In fact, I was ac- How to be the master of any situa- privacy of my own home FREE tually afraid of my own tion. to this most fascinating NORTH voice ! Constantly I saw subject. AMERICAN INSTITUTE 3601 Michigan Ave., others with less ability, less experience than There is no magic, no trick, no mystery about Dept. 1384, Chicago, Ill I being promoted over my head -simply be- becoming a powerful and convincing talker. You, too, can conquer timidity, stage fright, self -con- NORTH AMERICAN INSTITUTE, cause they had the knack of forceful speech, sciousness and bashfulness, winning advancement 3601 Michigan Ave., Dept. 1384, self- confidence, and personality-the very in salary, popularity, social standing and success. Chicago, Illinois Today business demands for the big, important Please send qualities I lacked. high -salaried jobs, men me FREE and without obliga- who can dominate others - tion my copy of your famous book, How to In social life, too, I was a total loss men who can make others do as they wish. It is 14'ork -I the power Wonders With Words. - was always the "left- over" one of forceful, convincing speech that -the who causes one man to jump from obscurity to the Name sat back and watched the others have a good presidency of a great corporation; another from time. I seemed doomed a small, unimportant territory to a sales -manager's Address to be an all around desk; another from I the rank and file of political City State failure unless could conquer my timidity, workers to a post of national importance; a timid,

www.americanradiohistory.com :,,,,,,,,1,,,,,,,,11,::, , \\\\ \\\\\\\°`° tb"> í tv` kirk Volume XIII April, 1926 Whole No. 156 \w'\aì\\\ \ No. 12

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Editorial and General Offices, - - - 53 Park Place, New York :::.,,,::,:,:,:::u,,, "Those Who Refuse to Go Beyond Fact Rarely Get As Far As Fact" - - - HUXLEY SUPERSTITION By HUGO GEKNSBACK

NE of the oldest and perhaps crassest of all human emo- do believe most of what is pandered about by these so- called "mys- tions is that described by the term of "superstition." tics", and as a rule swallow most of the findings, hook, line and In this enlightened age it might be thought that this sinker. savage instinct -because that is all that it is-would have The careful investigator will always be surprised at the large num- o -science of Astrology. been entirely eradicated. But not so. I assert that superstition ber of people who believe in the ancient pseudo today is as great, or perhaps greater, than it was in the days of Before we knew anything of the movements of the planets and the the Pharaohs and of the Caesars. In some cases, it is perhaps worse. stars, there perhaps was some excuse for such beliefs, but people When we watch the savages go through their -to us so barbarous today, just as well as those of old Egypt, still believe that it is lucky -performances, most of which are based upon superstition, we are to be born on a certain day, with the stars or planets in a certain moved, perhaps, to laughter or to pity, without stopping to think configuration ; and what is more, they can usually find what they that many of us are as bad as, or worse, than the savages them- consider good proofs to back up their claims. But when they are selves. made to understand that in each second of the day hundreds of dif- There, is for instance, the Taboo, which, to the savage, means that ferent people are born whose destiny varies for each individual, no a thing or object must not be touched under penalty of death. This explanation is forthcoming. However, there is a sufficient number is one of the most common of superstitions. To the savage it would of people born on any single day to bring up the average figures on probably appear equally ludicrous to see some of our enlightened any common characteristics of their future that they wish to establish, citizens walking around a ladder instead of passing underneath it, if only you believe in this crass nonsense. or refraining from opening an umbrella indoors, or from sitting at Palmistry, as practised by most fakers, is on the same level. I, a table with thirteen people, or yielding to many other equally foolish for one, believe in palmistry just as I believe in physiognomy, or limitations imposed upon themselves by our so- called enlightened other character indications. I believe, for instance, that it is possible folk. to tell certain things about characters, and occupation, by looking Most superstitions can probably be traced back to an instinct at one's hands. I need not be a palmist to identify the profession either inherited or experienced by ourselves. For instance, the fear of the village smith from his hands, nor is it difficult to read the of walking under a ladder was probably caused by a ladder falling occupation of a violin virtuoso from his hands either. However, that upon some one, thereby hurting or even killing him. This informa- is as far as I can conscientiously go. The faking palmist, though, tion was then pandered about until people came to believe that it insists that the lines of the hand will show your future and every- was actually harmful, or as we say, "unlucky," to walk under a thing that will happen to you in the future. These things, of course, ladder. We might as well be superstitious about walking in a street are utterly impossible and there are no authenticated cases on record, because a brick fell down at some time in the past and killed or save a few coincidences. To be sure, once in a while a palmist will hurt one or more of the passersby. The same logic is used in both strike the bull's eye, by the simple "law of averages ", but the hun- cases. dreds and thousands that do not materialize are kept quiet and are By a curious coincidence, many great people have been affected not advertised. by their various superstitions, and the greater they are the greater In order to amuse the populace, one of the latest superstitions is are their superstitions, and their stout belief in them. History, both to be found in the so- called "Numerology." This is the pseudo- ancient and modern, teaches that many of our greatest men were science, wherein numbers are linked with the letters of your name, and are afflicted by this "disease", if so it may be called. A man and, as is asserted by some of the exponents of this newest nonsense, sees a black cat walking in front of him perhaps twice during the if you are unlucky and if your career is not what it should be, the entire course of his life, a thing purely accidental. Now perchance mere changing of your name, which, of course, results in the change in these two cases something disagreeable happened to him, which, of your numerals, will immediately spell "success" and "fame" for to be sure, would have happened without the passing of the black you. cat. But the belief becomes firmly rooted in his mind, that of course As in all of the superstitions, there is a grain of truth concealed it is the cat that is to be blamed. Consequently, thereafter, if a here somewhere. I can understand, for instance, that where a man black cat crosses his path, he knows that something unlucky will has an unpronounceable name he will encounter a certain difficulty and happen to him ; whether immediately or six years later seems to resistance in getting on in life, but it can not count for a very great make little difference in his warped logic. deal ; because, after all, practically any family name that you can While some assert that women are more superstitious than men, think of has some lucky or successful members, whose numerology is the male sex is just as deeply afflicted, and if the superstitions of identical. the men are not so great in number they are as deeply rooted as in A great many of our superstitions are coupled with auto-sug- the fair sex. The woman being about the house a great deal natur- gestion and when everything is said, are in most cases harmless and ally encounters more elements of the superstitious that abound in the do not hurt humanity as a whole, except to show us that we are house, as, for instance, the superstition of the broken mirror, salt still savages underneath our "modern civilization" veneer. In some spilled on the table, falling knives and forks, the cricket on the cases it may even be said that some of our superstitions make us hearth, ad lib, ad nauseum. That these beliefs are deeply rooted more careful and more cautious in some of our actions, so they may in even the most modern and enlightened people .is difficult to com- be considered as harmless in most cases. prehend, but, unfortunately, it is true. Autosuggestion is a most powerful instrument of the mind. In In enlightened America, thousands of men and women, the latter many of our superstitions autosuggestion plays an important role. predominating, are flocking in ever -increasing number to Astrologers, For instance, a young woman is told that she will marry a tall, Hindu Soothsayers, Gypsies, Palmists, Spir- dark-haired man. This makes a great im- itualists, and many other fakers. The answer pression upon her, and the chances are that that you will usually get when asking one of THE GOLD EN AGE OF when she meets a man of this type, who is at these people why they pay out good money all acceptable she will be drawn strongly to for such hokum is usually a laughing reply SCI EN CE him, and in many cases she will marry that that they know that there is no foundation type of man. for the belief, and that it is done "just in is symbolized by the golden cover Of course she would not believe you if you fun." I personally have never been deluded OF SCIENCE & INVENTION, were to tell her that it was autosuggestion by such talk, because people do not spend LOOK FOR THE GOLD COVER that made her choose this mate, but she will anywhere from 50e to $5.00 for one of these every month! be sure that her marriage was correctly sittings "just for fun." Unconsciously, they predicted.

111111111 It 111111111111111111111 II MIMI! II I III 111111111,11111111111I1111111111111111111111111111111 Mr. Hugo Gernsback speaks every Monday at 9 P. M. from Station WRNY on various scientific and radio subjects. 1081

www.americanradiohistory.com 1082 Science and Invention for April, 1926 Safety on Submarines Various Devices Described and Illustrated by Means of Which Submarinists Can Escape From Disabled Submerged Vessels

AT the left are shown complete details of a patented type of submarine escape device that has been very cleverly worked out by its inventor and in which practically every emergency is provided for. This chamber, which in itself is so constructed that it will float, is designed to be one of several located at strategic points on the deck of a submarine. The chamber is so constructed that when it is entered from be- low and the hatch is tightly closed, one of the men within it can manipulate certain levers and release the entire chamber from the submarine whereupon it will immediately rise to the surface. The principal details of the mechanical construction of this system are shown in the illustrations at the immedi- ate left. This device was invented and patented by A. J. Griffin.- Patent No. 1,103,958.

The device illustrated above is so designed and constructed that when fitted on the deck of a sub- AIR marine it will not interfere with the maneouvering of that vessel in any way. It is firmly locked INTAKE in place by means of the system shown in the insert A, and when part of the crew of a disabled submarine has entered it, a lever is turned and the escape chamber is released. The lever operates gears which in turn act on a rack and rotate the chamber slightly, thus unlocking the fingers 11t,,RADIO illustrated and releasing the chamber so that it can readily rise. The me chanism is designed to TRANSMITTER operate on ball bearings so that even if a very tight fit is effected between the chamber and the submarine hull, still the release can be effected quickly and easily.

RADIO

Buoys AFTER BEING RELEASED FLOAT ON SURFACE

When something suddenly goes wrong with the controls of a submarine and the navigating offi- cers find it impossible to rise to the surface, the entire crew enters the rescue chambers described and illustrated on this page and the various hatches are tightly closed. Then, as shown here, the chambers or buoys are released and float to the surface, whereupon radio transmitters are put into operation and assistance is quickly summoned, As shown, more than one rescue chamber is pro- vided so that the entire crew can be taken care of. With some large submarines even more than the three that are illustrated here may be found neces- sary in order to provide complete safety. Neces- sary food supplies in a suitable concentrated form could also be carried in these rescue buoys. FRESH AIR FROM SURFACE

Above: Another type of rescue device for sub- marines wherein the occupants do not actually escape but are provided with air and with means of radio communication by means of a float that is released and allowed to rise to the surface, carrying a flexible air tube and control wires for a small yet powerful radio transmitter built into the float. When the buoy reaches the surface, collapsible radio masts and air intake funnels can be erected and the navi- gators of the submarine can summon assistance. -Lyman Mason.

www.americanradiohistory.com Science and Invention for i1 pri1, 1926 1083 Due to Several Recent Submarine Disasters, These Rescue Methods Should Be of Timely Interest

WHEN attempting to raise submarines to the surface after they have been wrecked or damaged and have descended to the bottom, the usual method of placing slings around the ves- sel is often found to be inade- quate for the work at hand. Other methods have been sug- CREW REMOVES COVER gested and tried but as often UCON P[AQ4 MG SU. FFACE as not have been found totally unsatisfactory. We only have to refer to the recent attempts to raise the S 51 to realize that the present -day methods of corn- LIFE BOAT batting the ever -present menace of submarine disaster are not capable of producing the de- HATCHES sired results. Therefore, we TUBE suggest in the illustration be- CREW CREW IN SEALED low, a method of constructing 7 TLU MEL LIFE BOAT RISING submarines so that they could be TO SURFACE readily raised to the surface when it is impossible to bring them up under their own power. In dotted lines, the present style of sling are indicated. Our method is to equip the hull with specially designed protuberances through the sides of which holes are drilled and through which holes, strong flexible cables are to be passed. Using this system, it is impossible for the cables to slip and the chances of eventu- ,,1SOLINE ally salvaging damaged submar- ines would be greatly increased. T h e suggested constructional WATER TIGHT TUBES work would of course be done THRU wFIICH MEN PASS when the submarine is originally made and the cable holes would be an integral part of the sub- marine framework.

COED

FLOODED COMPARTMENTS

ANOTHER inventor, E. R. Kimball, has advanced the theory of submarine rescue illustrated in detail above. Mr. Kimball's idea covers two important phases of the subject. First, he would connect all of the separate watertight com- CABLE DECK' partments of the submarine by means of a tunnel of sufficient size to allow a man to crawl through. In each compartment there would be a watertight entrance into this tunnel which would be kept locked at all times except when it was to be TUBE used as an emergency exit. The second part of the scheme is to place at intervals along the deck of the submarine, inverted boats with sealed covers and with watertight tubes communicating with different compartments of the submarine and with the inverted life boat. In time of an emergency, let us assume that, as illustrated above, three of the submarine compartments are flooded. Those of the crew who are alive and are stationed in the other compartments would immediately pass into the communicating tunnel and proceed into one of the compartments with which one of the tubes to the life boat communicates. They would then pass up through the tubes into the life boat and when all were assembled, they would close the hatches and release the life boat from the surface of the submarine. The inverted boat would then be released from the deck of the submarine where- upon it would immediately start to rise to the surface and by the crew shifting their weights as shown, the boat would be in an upright position when it arrived at the surface. Then, of course, the watertight cover would be immediately removed, the gasoline engine would be started and the crew would proceed in their life boat to find assistance. There are many other refinements possible for this idea than those that we have shown in our simplified diagram. For instance, provision could be made for forcing water out of flooded portions of the tunnel and out of flooded life boats in case such an emergency should arise. Of course, more than one life boat could be placed on each submarine and in this case the chances for rescue increase.

www.americanradiohistory.com 1084 Science. and Invention for

An ancient "quack" Beware of the Cures Claimed at work. Here. They Are Fraudulent

were first founded. As a matter of fact, I have in my possession a book bearing the copyright date of 1900, which describes the treatment of warts in the following terms : "When there is a full moon in the sky, go to a graveyard and find a hollow trunk of an oak tree, or the hollow stump of an oak tree, in which a small quantity of rain from a previous downpour has remained. Dip the hand in the water in the stump of the tree, then walk around the tree stump three times, being sure that you walk to the left. Signs in drug store windows are often very When your own shadow crosses the hollow deceptive. Be guided only by the claims made in the stump, after you have walked around on the packages containing medicines, as such the tree stump .three times, dip your hand statements are under government control. in the water again. Then go home, but do not speak a single word to anyone until the VARIOUS REMEDIES There are, of course, some but not a great many, substances that are absolute remedies. Quinine, known for three hundred years, How a popular and expensive "med- is a specific for malaria. Mer- icine" used by the old Egyptians cury is seven hundred years old, was imitated by treating meat with and melted pitch. arsenic two thousand; five hundred years old; both are agents of known value. There THROUGHOUT all ages are a great many others which of the world people have help, even if they do not cure. suffered from diseases, im- ANCIENT MEDICINES aginary or real, and they have usually recovered, either Let us for a moment drop back spontaneously or with the aid of into the olden times when medi- proper remedies. It is not always cine was not as far advaned as possible to decide in any given it is today. Some four thousand case whether the natural power of years ago, the Egyptians had a recovery which the body possesses whole series of what they thought has brought about a cure, or to be remedies for nearly every whether the treatment alone, or disease that flesh was heir to. whether both together have been There were more than seven hun- effective. But in most cases the dred drugs employed in Egypt. influence of the imagination and Not a single one which the Egyp- belief is easily seen. Every phy- tians employed is now in use, but sician of experience has had cases to- the Egyptians were deceived, as in his treatment has bene- The vender of rattlesnake oil is a rare sight today, but it was not so many years we are being deceived today into which The oil is fited his patients much more than ago that he did a thriving business in even the large communities. believing that each and every still sold by an occasional medicine man, but his numbers are few, and steadily one of the drugs was capable he had reason to expect. On the decreasing. other hand, a patient may suffer of bringing diseased individuals for many years and receive treat- back to health. During the Cru- ment from the best doctors in vain, and then following. morning. If one treatment does sades, preserved portions of the bodies suddenly recover after using some patent not cure, another attempt should be made." of old Egyptians were considered to 'be powerful medicines, and "mummy" was medicine, which he then recommends to all DECEPTIVE CLAIMS OF CURES his friends. The little pink pills he has frequently prescribed as a cure -all for of a method of treatment is as absurd been using then become a panacea. Such any disease. "Mummy" was expensive, so as it is worthless, but a drowning man grasps medicine in FRAUDS "patent sharks" those days, if GOVERNMENT CHECK ON at a straw, and most of us, when we are ill, they may be called that, took ordinary meat Eventually, however, the Government try those cures which others claim they have and impregnated the meat with pitch. chemist or the medical societies analyze the found to be so wonderful. Not infrequently, Then they palmed this off as the gen- pills, only to find that they contain a little testimonials of cures which have been ef- uine article. Testimonials declared this sugar and some pink coloring matter, to- fected, when carefully checked up, will be remedy to be marvelous. Then there gether with a small amount of purgative found to be inaccurate. In many cases, the was another substance called "Usnea" in drug. The pink pill cannot possibly do what sufferer will have died of the very disease pharmaceutical language. This was moss is claimed for it, and the preparation is re- which his testimonial indicates was cured which was scraped from the skulls of persons moved from the market. by one or the other of the various (Continued on page 1144) The statements just made no doubt sound preparations. absurd, but our treatment of various ail- Fully two thousand, five hundred years .11°.-- ments today is far less peculiar than the ago there were faith healers that were mak- Kidney plasters is and liver pads. treatment employed when the United States ing the same pretenses that Emile Coué designed to re- making today with his "getting better and lieve all ailments better every day." Is there any hope that of the back and mankind will ever be any different? cure many dis- Did you ever eases are useless. wear an "elec- Money spent in tric belt" such purchasing them as illustrated at is money thrown the left, in hopes away. Usually of curing a dis- the pains that ease? If so, you are so treated undoubte 'ly are merely of found that it So- called electric insoles for shoes are illus- muscular origin, gave no relief and not of the and was a fake. trated above. They contain disks of dissimilar metals but there is no beneficial electrical ac- kidneys. tion that takes place in them

www.americanradiohistory.com Science and Invention for April, 1926 1085 Electric Snow Eliminator By J. KAY LONDON

Above is shown an artist's conception of how the proposed electric snow will develop heat when current is passed through it. As a safety precau- eliminator would work. The system consists of a fanlike arrangement of tion current at low pressure is used, so that should a wire break, there will wires stretched across the streets and thoroughfare. The wires are pre- be little danger to pedestrians, even though the current were not turned off made of iron or some other electrically resistant material, which immediately after the break. The small insert shows the circuit to be em- ferably ployed. WHEN winter comes and the snow Such a system is illustrated above and the other output side of the step -down trans- Wlays heavy on the ground great diagram is likewise given. It will be seen former connects with the iron wires near the sums of money are lost because of that the device could easily prove satisfac- buildings on the opposite side of the street. traffic tie -ups and many tons of tory. The falling snow reaching the vicinity The question of current supply is now im- perishable merchandise go to waste. This of the wires stretched across the streets is portant. In those cities where hydro -electric condition affects the greater cities more melted by the hot wires and falls in the form power development has been organized by vitally, than it does the outlying districts, of raindrops to the sidewalk below. Now either the city itself or by some large com- because the latter generally provide within unless the outside temperature is exception- pany, the electric power supply is quite cheap their homes for weather conditions, whereas ally low, this partially warmed water will and the cost of operating such an installa- the former are dependent on a daily purchase melt any snow which should happen to fall tion would be very low. In fact the expense of commodities for their welfare. For this through the wires outside of the heated area. for operating a system of this nature would reason the large cities go to a great expense Thus the walks and thoroughfares are kept be cheaper than attempting to remove the in removing snow as rapidly as it is possible, clear of snow and pedestrians use their um- snow by any of the snow removal methods but even the highly efficient departments in brellas as they would on any rainy day. Such which we now employ. these cities could not cope with a situation a system would likewise keep the streets It remains to be seen whether this method similar to the snowfall in New York City in a little warmer than they are on some of the would cope with very heavy snowfalls when 1888, when the snow was banked more than wintry days. the surrounding temperature is considerably below freezing. It might even be advisable ' ten feet high in many places. Naturally such a The installation itself would not be very snowfall closes all shops and interferes with expensive. Insulators would have to be at- to place ordinary switches in the circuit so the use of elevated trains and street cars, as tached to the walls of buildings about twenty that when the outside temperature falls to well as other means of surface transportation. feet above the street level and iron wires let us say ten degrees below freezing, the If, however, we had all the main thorough- would then have to be stretched from one device would be shut off and in this way fares wired with a net -work of iron wires side of the street to the other. Iron wires, slippery streets would be prevented. Should located approximately twenty feet above the of course, are quite cheap, but any other one or more of the wires break, the possi- street level, and if these wires were con- resistant material might be used in place of bility is that the cooling effect of the air nected to sources of current supply at as low the iron wires. These wires are then con- would prevent a burn if the wire dropped a potential as twenty volts, it would be pos- nected together at one end with a bare cop- upon the pedestrian. At a potential of twenty sible to heat the wires sufficiently to melt per wire, and this lead terminates at one volts, accidental electrocution would be im- any snow falling upon or near them. of the poles of a step -down transformer. The possible.

www.americanradiohistory.com 1086 Science and Invention for April, 1926 "Antinoe" Sinking Cabled Across the Atlantic By H. WINFIELD SECOR, E. E.

At the left appears a picture of the foundering "Antinoe" as cabled from London to New York over the regular cable system. As shown on the right hand page the perforated tape contain- ing the proper sequence of signals was made in London from the original snap- shot of the "Antinoe." As the enlarge- ment in the small circle shows, every part of the picture is composed of square dots similar to those of a half tone. These dots are of varying degrees of light and shade, and owing to their small size a faithful picture is built up as becomes evident by viewing the ac- companying reproduction at arm's length.

OOO

Photo at right shows machine for reproducing photo as well as preparing transmission tape in New York office of photo syndicate service. Man in center is Captain M. D. McFarlane, who in col- laboration with H. G. Bartholomew of the "London Daily Mir- ror," evolved the Bartlane system of transmitting photos by radio or cable. The pictures may also be transmitted over telegraph lines if desired. The man at the extreme left of the picture is C. F. Willis, Bartlane expert, and man at right is F. S. Millar of the Western Union Cable Company. The photo shows first pic ture being received from London, September, 1925.

f ® ' NEW ,YORK CHICAGO

5T tOU15 WASHINGTON \ D. C. ' Map at left shows -s present facilities 4r11C 0C-A11 in actual operation f o r transmitting pictures such as "Antinoe" across ocean and to all parts of U. S.

The diagram at ' the immediate right shows the 4. -- tone scheme employed in this process. It should o----- be remembered to begin with, that no special cable transmitting or receiving apparatus is necessary. The snapshot received in London by airplane from - the S. S. "President Roosevelt," was hurried into the Laboratory, and five prints on zinc were made from the negative, each of a different exposure, giv- ing the five principal tones of light and shadow. There are really six tones obtained in the complete at shows. The five process, as the diagram right Above we see the smiling face of of exposed prints on zinc leave certain parts metal New York City's new mayor the and an electric circait is established through these as shadows, each Honorable James J. Walker, portions, corresponding to lights and reproduced in London papers perforators as shown on op- registering on certain from a picture cabled across the posite page. The cable company receives the per- Atlantic from New York. Did forated tape, transmits its readings across the New you notice the art border around ocean, the new tape being delivered to the It is composed of five laboratory, and reproduced as a picture in the this page? York feet of the perforated paper tape, A marvelous concentrating lens manner shown. a small part of the two hundred combines the light rays in the reproducer to make required tone values. and seventy feet of tape square dots of varying to transmit Mayor Walker's pic- ture across the Atlantic.

The tape forming the border of this page and comprising a part of Mayor nais for photo are transmitted across the ocean in a few minutes. Once the Walker's photo shown above, is just one -half the width of the actual tape tape is placed in the reproducing machine it requires but one and one- fourth used. It takes a relatively short time to prepare the five tone negatives minutes to record the picture on the film, develop and fix it, and obtain a from the original picture in the transmission laboratory, and the tape sig- print from the wet negative.

www.americanradiohistory.com Science and Invention for April, 1926 1087 How Photos Are Cabled Across Atlantic

a ° ,II. g.`p_ L. O° ANEGATIVE SENT s'' 's 1 BY AIRPLANE 70 _ ,_ I1IfIr. 7 7 IIIn111 LOjv °/S.S.PRES.ROOSEVËLi ARRIVES DON AT PLYMOUTH ENGLAN i ...... PHOTO TAKEN ; ._...... OF S.S.ANTINOE '----- ...... ,. TAPE PERFORATED IN SPECIAL s°. LABORATORY IN 30 MINUTES EACH PRINT HAS t--- ELECTRIC CONTACT NEEDLE -PROGRESSIVELY MORE AND MOTOR DRIVEN 2 MORE SHAFT PROPELS DETAIL PICTURE ALONG AXIS 3 _ --- EACH PRINT OF DIFFERENT"r EXPOSURE, t 5MADE ON DEVELOPED, SENSITIZED CAMERA INC PLATES, NEGATIVE 1L. MAGNET COILS PLATES-DEVELOPED. PULL ` COATING LEFT ÖN SHADING- SPOTS ACT AS INSULATION ¡PERFORATED STANDARD I TAPE CABLE CO. A TAPE LONDON RECORDER

HIGH SPEED STANDARD TAPE TRANSMITTER IN CABLE CO. OFFICE ELECTRO MAGNETS :`.;:ÖT*''c, ::"..:, OVER WHICH PERFORATING ATLANTIC CABLE NEW PAPER ELECTRIC SIGNALS (DOTS) TAPE IN AMERICA ARE TRANSMITTED

k k ROLL OF PAPER ,i i i REPRESENTING PHOTO, OF ANTINOE SINKING , 4"x 5" FILM DELIVERED TO \ .s-ó ON MASK EXPOSES FIVE NEWS -PAPER OFFICE BY CABLE CO. MESSENGER ROTATING PERFORATED HOLES ROLL IN ONE LINE ONLY ROWS OF DOTS OF VARYING STRENGTH EXPOSE ADJUSTABLE OF / SLOTS ON FILM, PITCH NIIIIIINaooimui ROWS CORRESPONDS TO 11111110m TRANSMITTED II THREADED SCREEN SHAFT PROPELLING SENSITIZED ROTATING ll=° FILM PAST ))))))»)))))))))))))))ll II BEAM OF LIGHT 1111111111111111111101111 SQUARE LENSES SLOT 1Y4 MINUTES TO RECORD SPOT OF LIGHT SPECIAL PHOTO ON FILM CONCENTRATING ...... LENS COMBINES 5 RAYS INTO ONE BEAM

REFLECTOR PRESS FEED WHEEL PHOTO COPIED BY ENGRAVERS "a.. CAMERA TO GET HALFTONE 00. ....® ' ,. SN.THEN : - PRINTED ON i t+,, 4 COPPER mss. PRINT MADE PROM , ,, A, PLATE, 11..0 1/ WET NEGATIVE ,,I ETCHED, SENT TO ' '' OR ENLARGED TO PRESS, PRINTED ONli 8"x 10" RETOUCHED NEWSPAPER - f IF DESIRED

When the crew of the S. S. "President Roosevelt" was rescuing those ated from the metal and the Iight parts were not. Then, as contact needles on board the S.S. "Antinoe," a photograph was taken of the latter vessel. were passed over the surfaces as shown, circuits were made and broken and This photograph was subsequently sent by cable to the United States for the tape was perforated. These perforations were transmitted in the usual publication. The above illustrations shows the various steps in the trans- manner, received and recorded. The recorded tape was then photographic- mission. Five prints were made from the negative on zinc sheets. These ally impressed on a sensitized film in the special manner illustrated. From were then developed and by the process used, the shaded parts were insul- then on, the process is plain.

www.americanradiohistory.com 1088 Science and Invention for April, 1926

In this very interesting and comprehensive Can the Dead. article by Mr. Hugo Gernsback, the subject of communicating with those who have passed By HUGO over the borderland from this into a future life is taken up, particularly as it appertains to Member American the possibility of communicating with others in the spirit world, who may have passed along BEFORE I go further, I wish the road to that mysterious land, sometime be- to fore you yourself take the journey. Assum- make it plain here that nowhere ing that only a quarter of a million years have in this article do I attack any re- elapsed since man first trod the ground of this ligious belief, or take issue with planet, and assuming that all of these shells any religious doctrines. I wish to shoe which we call bodies and which house that in here merely my own impressions on the describable something called the soul, were subject, approaching the problem from a piled up in the form of a pyramid, that pyra- mid would reach a height of nineteen and scientific and mathematical viewpoint. I one -half miles, and would have a base six and believe that whatever new ideas can be one -half miles square. This pyramid would brought forward in an all- absorbing topic eclipse the world's highest mountain, Mt. of this kind should be welcomed by all. Everest, which by the way has never been I shall not question the hereafter nor dis- scaled by man. cuss the question of the existence of the soul in any way ; but I do believe that con- sideration of certain angles of the subject will do no one harm, and perhaps give rise to some interesting discussion of this prob- lem. As far as science knows, the human race has been on this planet some 500,000 years or more. When I say "human race" I do so advisedly. For instance, the human being who existed 500,000 years ago is known to science as Pithecanthropus Erec- tus. This first, so- called "ape man," of Java, gives science its first idea of what our remote ancestors were. If he was a being who could speak, orally, he must be called a human being. But we need not look back quite so far ; and for the pur- poses of this discussion I -shall go back for only 250,000 years ; at which period we are certain that there were human beings on this planet imbued with a fair degree of intelligence, and possessed of what we are pleased to term today "soul ". This is in contradistinction to our closest relation, the ape, who, in popular belief, is thought of as not being possessed of a soul. It is upon this platform that the present The question of the possibility of communicating arguments are being reared. can be with a spirit, while you yourself are in the spirit It world, is taken up in the accompanying article shown that for 250,000 years or more the from a purely scientific viewpoint. No attempt is population of the earth has not varied very made to dispute religious beliefs and there is no greatly. While, perhaps, the population at desire to attack any religious doctrine or teaching. that time was not 1,748,000,000, -which is The queston of the hereafter is not discussed and the population of the world today, -it is accepted on its face value. The main subject probably was 1,000,000,000 under discussion is the possibility of communicat- well over (one ing with some single individual in the spirit billion) for the following reasòns:- world. The particular form of communication is It is well known that the fecundity of also not given in this particular article. It is as- aborigines was much greater than that of sumed that communication may take place in any civilized man. For instance, at present it of a variety of ways known and unknown to us is to be doubted that the average family has today. The questions are looked upon purely from the standpoint of chance possibilities and more than three or four offspring. Hun- your chances of effecting those communications dreds and thousands of years ago this was have been calculated the same as Hoyle calcu- not the case, the number of children being lates your chances of getting a straight or a royal very much greater. flush in a game of cards. If the doctor told you I't is also true that even as recently as that you had one chance in ten trillion of living 2,000 Let us assume that the souls of men are only another twenty -four hours, the outlook would be years ago, people did not live as long as large as an ant, one- eighth of an inch long, quite hopeless. Well, you have less chance than as they do now, and died comparatively and that these are placed end to end. This that of communicating with a departed spirit! young. Diseases had not been conquered, chain of ants would reach out into space for a and people died like flies, due to plagues distance of 21,390,769% miles. It would take and infantile diseases, as recorded in his- a beam of light one minute and fifty -four sec- onds to reach the end of the chain. tory. Counteracting this, there were many more births than there are today. Modern man, who is beginning to conquer dis- eases, does not have as many children as were customary at that time ; so while it would seem that we should have a vastly larger population today, it remains fairly constant. In China and India, even today, there are still a great many more births than in the western civilizations ; but these are immediately offset by devastating dis- eases, famines, etc., which kill off so many more people. The balance is therefore ad- justed very nicely by Nature. Careful computation shows that the yearly deaths for the entire planet take 43,369,813 The same chain of ants would form eighty -nine lives out of the 1,748,000,000 inhabitants. If rows from the earth to the moon, and would f 1,711 we take this yearly figure and base our cal- easily encircle the equator of this earth 1,711 times aro upon 250,000 as already your possibility culations years, times. What do you suppose 10,- would be of picking out one single individual Equator mentioned, we shall get the figure of ant in this chain, and what would be your 842,553,250,000. This is a tremendous chances of communicating with that ant? number, far greater than is possible for

www.americanradiohistory.com Science and Invention for April. 1926 1089 Be Re- United? GERNSBACK, F.R.S. Physical Society the human mind to comprehend. The figure, nevertheless, must be fairly approx- imate, but even if it should vary from the exact number by a few billions this would make very little difference for the purposes of this discussion. We are now confronted by the fact that if, during the past quarter of a million years, ten trillions of souls have passed into the Great Beyond, these ten trillions must still ke floating around somewhere in space, if there is such a thing as a Hereafter. Life insurance figures, carefully calcu- lated, show us that the difference between the "expectancies" of man and woman av- erages a little more than two and a half years. By this we mean that the average you die, your wife, chances are that when seas. Someone on board that die two and a half Somewhere in the Atlantic Ocean a ship is sailing the high ship if of the same age, will throws a bottle into the ocean. Anywhere else in the world a person goes down to the shore to years later. These, of course, are only look for that bottle. What do you suppose your chances of finding that bottle would be? Remem- average figures. ber it does not make any difference where the ship was or where you were when you looked for Let us now take an average case : Tom the bottle which measures 4 5/16" in diameter. Jones, a man of very religious nature, be- lieving in the soul and the Hereafter, dies in Europe; and if you go back for some found is today. His spirit, according to his belief, 250,000 years it will be that there will therefore pass immediately into the not one spot, that has not been at various Great Beyond. In all probability, his be- times inhabited by thousands upon thousands loved wife, whom he sincerely hopes and of people, who have long since died. Do prays to meet in the Beyond, will follow him their souls stay in any particular spot, or not much less than two and a half years do they roam around, after reuniting, or later. The problem then becomes "What are not? the chances that she will mcet him in the This question should not trouble us a great Hereafter and again be united with him ?" deal, because it can be answered to the satis- Tom Jones, after he pass- faction of all by any one who has religious If we assume that here es into the Great Beyond, retains his percep- beliefs. But I wish to point out that tive and reasoning powers and can remove it can not be denied that there must be a himself to any point on this globe, the dis- great deal of crowding in the Beyond, unless cussion must stop right here; because the the reunited ones float on to the outer space, probability then would be that he would never to return. This, of course, would certainly be near the locality where his wife make it much simpler for those who also lived but recently, and the minute she died pass away, if we assume such a condition. and passed into the Hereafter, he would It would seem more rational, however, that, meet her instantly. That, of course, would having passed from this life, the departed end the problem to the satisfaction of every souls would stay or hover around the planet. one. There would then be no discussion. If we assume this, we immediately become conscious that somewhere around the planet But let us go a little further. Some eccle- there are continually floating some ten tril- siastical writers and theologians believe that lion souls. the soul has some shape, and for that reason must assume some dimension. Whether these If the departed ones mingle with those Now we see a man down at the shore looking dimensions are absolutely fixed or not need who have already gone into the Great Be- for a bottle which may have been thrown yond, what are the chances of the ones who overboard off the coast of Africa. This man not enter into this discussion at all ; but with ten trillion souls abounding somewhere above die two or more years later to be reunited approaches the nearest shore line to his home, with their beloved ones? Again I shall be and with a pair of spy glasses which restrict the planet, it must be assumed that there his vision to a circle 4 5/16" in diameter, he would be practically no standing room, told at this juncture that souls, by means not looks in -if known to us, eleven places and has just as much we may use such an irreverent term, -for are able to communicate with chance of finding it as he has of communicat- any of the souls. each other instantaneously, no matter where ing with a spirit. they are. If we ascribe this supernatural While the earth is inhabited to a great power to the departed souls we have no extent, yet there are still not so many places problem; because if even one lone soul ar- where people actually live. There are, of riving among ten trillion others scattered course, isolated farms, and mountain tops, anywhere in space, were endowed with tele- where the number of people who have actu- pathic powers, the reunion has not would be very ally died been very great. But take prompt. But of course we are not positive any of our crowded regions, as, for instance, that the departed ones have such power ; and without wishing again to deny this, let us assume that they have no such power. What, then, are the chances of one soul finding an- other one? This becomes a simple problem of mathe- matics, and may be stated as follows : In a poker game, a royal flush comes once in 649,739 times, according to Hoyle. Your chances of getting a royal flush, are 16,686,- 166 times better than your chances of com- municating with a particular soul. If the departed soul has any dimensions, it may be as big as a planet or bigger, or as small as an electron, or smaller. If it had the size of an ant, or, let us say, was one - eighth of an inch long, and if all the ten trillions of souls were placed end to end, this distance would be 112,943,263.020 feet, or A needle is concealed in the haystack here A "royal flush" comes once in 649,739 times 21,390,769% miles, almost 90 times the dis- tance shown 900 feet high. Do you suppose that you (Hoyle). Your chances of getting one are from the earth to the moon, or about would be able to find a 2% -inch needle in this 16,686,166 times better than your chance of 1,711 times around the Earth's equator. pile of hay? If not, do not expect to be able communicating with a single soul. (Continued on page 1151) to communicate with a departed spirit.

www.americanradiohistory.com 1090 Science and. Invention for April, 1926 Electro- Chemistry Restores Ancient Bronzes Crumbling Statues From Ruins Of Bygone Centuries Can Now Be Restored To Their Original Grandeur

bronze plate shown at the left above, it is almost impossible to see any of the hieroglyphics. Above: A fully re- Above: Corroded sta- On the stored bronze statue tue before it was However, after it has been restored, as shown on the right, by the electrolysis method, practically all of the inscriptions are visible and can easily be deciphered. reclaimed by the elec- treated to restore it to tro - chemical method its original appearance described here. and form.

THE cleaning, repair and restoration of in a 2% caustic soda solution as the cathode art objects has always been a of an electrolytic couple, and pass a low am- ancient perage the solution. most interesting subject, but up to the direct current through that have been Two anodes are used, iron duriron or platin- present time the methods of have been rather haphazard and as um, and they are hung on opposite sides followed object. For parts 0.1 to 0.5 amperes often as not have resulted in failure or com- the small of valuable material. It are employed By the action of the elec- plete destruction trolysis, the crust is reduced to spongy is obvious, upon consideration of the subject method of restoring bronze ob- copper. The object is then removed from that a good and carefully washed in warm jects will be of great interest to antiquarians the solution throughout the world, water. If now there is a metallic base to and muséum directors layer inasmuch as not only statues and other the object, the reduced spongy copper have been found in excavations may be removed by gentle brushing. If, bronzes that however, there is no metallic core, the object in ancient cities have suffered, but more modern bronze objects are often badly corro- is dipped into a solution of 1 part of nitric ded due to exposure to the atmosphere and acid to 4 parts of water, and into water al- the elements. The application of acid and ternately over and over again, until the re- other similar corrosive agents to such works duced outer layer of copper is dissolved. of art often is disastrous in results. Mechan- Soon the hard copper oxide surface in whicli ical methods of removing incrustations are so is found the detail of the design is exposed crude that parts of the objects are frequently and this surface is found to be almost as damaged beyond repair. hard and smooth to the touch as was the A study of this subject has been under- original metallic surface of the bronze taken by Prof. Colin G. Fink and Charles itself. H. Eldridge of Columbia University and the The various photographs shown on this results of their findings have been published page illustrate the wonderful results that can

in a pamphlet issued by the Metropolitan be obtained by expert manipulation of . the Museum of Art, in New York City. In process described above. For instance, note essence, the new method that has been dis- in the illustration at the top has the bronze plate covered utilizes reverse electrolysis. It center of this page. When originally dis- been found that in practically all cases, the :CAUSTIC relic was practically valueless objects is C.h?::nnr covered, this on the surface of metal i 5..0DA SuLU[IU!d corrosion (ct RUAD B ZE STATUE) the inscriptions upon it could not be a metallic salt and by an electrolytic method, because reduced to give their ANODE (oNiofPLATINUM) deciphered. When restored by electro -chem- these salts have been in de- basic element, that is the metal, and istry, there was no trouble whatsoever original This diagram shows the detail's of the electro- the exact history of the antique as a result it has been possible to restore cor- chemical method employed in restoring an- termining roded metal objects to their original con- cient bronzes of various types. plate. tours, even in the original metal. It has been found that the details of design or work- manship have been preserved and followed exactly by the layer of metallic oxides cover- ing the objects. Over this is usually found a crust formed by electrolytic decomposition and by reversing the process of electrolysis, this crust can be removed, and the oxide re- duced to metal. By following the method described be- low, it has been found possible, not only to restore partially corroded metallic objects but also to bring those back to their original form that have been wholly oxidized. In other words, even though there is no metal Another example of a restored bronze art object is shown in the above photographs. At the present, the oxide can be changed so as to left, the destructive corrosion can readily be seen. No details can be discerned. At the right, form. The first step the photograph shows the same statue after restoration showing the complete detail that has present the original Art. in this process is to hang the bron7.e object become visible throughout the entire structure. -Photos Metropolitan Museum of

www.americanradiohistory.com Science and Invention for llpril, 1926 1091 New Steel Resists Great Heat Oxy- Acetylene Torches Fail To Affect Donsteel

IN a recent demonstration of a new penetrable by any known means and there- alloy steel christened donsteel, in honor fore, perfect protection is achieved by the of its inventor, J. G. Donaldson, vice - combination employed. president of the Mosier Safe Co., that The vault in which this door is to be material was proven to be far superior to placed will be 60x20 feet and the walls will any other alleged torch- resisting materials. be constructed of reinforced concrete sev- The demonstration was given in order to eral feet thick. The entire installation is so show just how burglar -proof the door of a made as to be absolutely burglar -proof. new safe to be installed in a Dayton, O., Our various photographs on this page show bank has been made. Constructed of a sheet metals undergoing the test of enormous heat of donsteel and a core of the same metal, and the one at the bottom of the page shows 6 inches thick, this safe door will foil the the donsteel core being inserted in the sheath. attempts of the most up-to -date and scientific It is obvious from these tests that the most safe breaker. scientific cracksman with high speed drills In the demonstration given, sheets of and cutting torches would be foiled when en- ordinary iron such as used in some cheap countering a safe door composed of donsteel. makes of safes were attacked with an oxy- Even hours of work could not penetrate it, acetylene torch. The material readily yielded or even make an impression. and a 1 -inch plate was cut through in less than two seconds. Then other types of safe Right: Attacking a sheet of ordinary steel with including such supposedly an oxy- acetylene torch and cutting throueh it metals were tested immediately. This demonstrates the lack of burglar -proof metals as chrome steel, coin- protection of an ordinary steel safe. pos.tions of steel and copper and mixtures of steel and carborundum. Each and every one of them yielded to the intense heat of the blow torches, proving that many cif the so- called burglar -proof safes in use today cat be readily rifled by means of an acetylene torch in the hands of an expert. With some of these materials, it was necessary to use what is known as the "fluxing iron" process, invented by Francis J. Napol.tan, which con- sists of burning an iron rod against the sheet of metal to be cut with the torch. Doing this facilitates the work enormously and it is said that a process similar to this is used by many professional cracksmen. In any event, everyone of the metals tested, with the ex- ception of donsteel, yielded quickly and easily. Aster these tests were completed, they were all applied to donsteel and with this metal, even the usually effective fluxing -iron process failed. First, the sheath of don - steel was 'heated with an oxy -acetylene torch for five minutes and the surtace remained unchanged. Then, a disinterested party of oxy-acetylene torch users attacked the same sheet and after two hours work had still failed to make any impression. Then the 6 -inch thick core of the safe door was tested. It could not be affected in any way by means of either an oxy- acetylene torch or a drill. The reason why both a sheath of donsteel and a thick core of the same metal is employed is because it is be- lieved that the thinner sheath can be burned through if sufficient time is employed and that it can eventually be penetrated by a drill. However, the thick core is absolutely im-

Above: When a sheet of the new donated was acted upon by the hottest possible flame, the results were absolutely nil. It was found im- possible to penetrate the sheath and in fact, no noticeable impression could be made upon the material at all. Successive attempts extending over periods of hours were fruitless. The ma- terial was thus proven ideal for use in the con- struction of absolutely burglar -proof safes.

Left: Lowering the 6 -inch thick core of don - steel into the outer sheath that comprises a vault door. The combination is thus made virtu- ally burglar -proof and in fact could not be pene- trated by any means that is at the command of the present day safe breaker. In combination with a reinforced concrete vault, perfect pro- tection is achieved.

www.americanradiohistory.com 1092 Science and Invention for April, 1926 The New Cosmic Ray The Existence of a New "Cosmic" Ray With a Wave- Length of But One Ten Millionth That of Ordinary Light, Has Been Shown in a Recent Series of Interesting Experiments Described Here By PROF. DONALD H. MENZEL, Ph.D.

PROBABLY what will prove to be one rod, thus charging the two gold leaves of the most startling and far -reaching similarly. It is an elementary law of elec- discoveries of the year has just been tricity that unlike charges attract while like announced by Dr. R. A. Millikan, charges repel, therefore the two leaves take director of the Norman Bridge Labora- the position (a) when the electroscope is tory of Physics of the California Institute charged and (b) when discharged. The of Technology, Pasadena, California. In discharge is always due to the conduction of brief, it might be said that he has proved the original charge outward or of a neutral- the existence of a super -X -ray, for it his izing charge inwards. The discoverer of the new cosmic ray, Dr. many of the properties of that now well - the electroscope charged and per- R. A. Millikan, is shown above with a device Suppose of his own design which made possible the dis- known ray. Perhaps a short review of fectly insulated from all stray sources of covery of these rays. X -rays will not be amiss here. electrons. It would be reasonable to suppose -+R that it would remain charged indefinitely. ELECTRONS The British physicists found that the rate of / MAGNIFIED LIGHT WAVE TO discharge could be lessened by increasing the HIGH STON POTENTIAL thickness of the sides of the box, nevertheless it could not be reduced to zero, as might be expected from the above reasoning. In fact, r X-RAYS

/ X-RAYS 1" FIG. FIG. I 2 If one wave -length of ordinary light were magnified to the size shown above, a cosmic Fig. 1 shows how X -rays can be generated If X -rays were magnified to the wave-length which, up to a short time ago were thought to shown above, the length of the waves of ray enlarged to the same size would have a have the shortest wave -length of any existing ordinary length would be one-fifth of a mile. wave -length of only one inch. rays. Millikan's experiments prove that the walls X -rays, or Roentgen Rays as they are LEAD COSMIC RAYS,/, would have to be six feet thick in order to sometimes called, are produced when atoms the cosmic ray. But what effect high speed electrons -Y . exclude are bombarded by very - RADIUM /iy° does this have? a poten- / e , electrons which have fallen through Fig. 1 how Fig. i ; We have already seen from tial drop of thousands of volts. (See .i, , e i fr/ X -rays may be produced. If the collision of 1). A is a hot filament, similar to the fila- NO . . ' an electron with an atom results in the producing a . , ,' %: ment in a vacuum tube, for RAYS ' ', emission of light, it is easy to see how the stream of electrons which are drawn over HERE ,' ,: X beam -ray , . collision of an atom with an to the anode B, a piece of metal, by the may produce electrons. It is a simple re- source of high potential. ,' NO RAYS versible process. Thus, as long as X -rays WAVE- LENGTHS OF NEW RAYS HERE 6 FT. OF or cosmic rays are present, electrons will be Ordinary light is known to be a sort of LEAD found which will discharge the electroscope. wave- motion, the distance between wave FIG. 4 COSMIC RAYS COME FROM BEYOND crests being only about one -fifty thousandth At first it was thought that this new of an inch. Small as this may appear, it is Radium rays will penetrate less than one-half radiation had its origin in the earth's atmos- a large distance compared to the length of inch of lead, but cosmic rays, of much shorter phere. However, when balloons were sent X -rays, which are shown in Fig. 2. The wave -length will penetrate nearly six feet of Fig. 7) at the same material. up to a height of ten miles (see shortest rays yet investigated are the so- which altitude nine -tenths of the earth's at- called gamma -rays emitted from radium, yet mosphere was below and only one tenth the new cosmic rays are fifty times shorter. above, the radiation was discovered to be Imagine a wave of ordinary light magnified more than twice as intense as at the surface 500 billion times (Fig. 3). It would then be of the earth-proving definitely that it two hundred miles long and would stretch came from without. from New York to Boston. If the new cos- Professor Millikan's next step was to find mic ray, however, were similarly treated its out, if possible, how penetrating was the new magnified length would be but one inch. radiation. To accomplish this he sank his One of the most notable properties of electroscopes and recording apparatus into gamma rays and short -wave radiation in Muir Lake, a body of water located on Mt. general, is the remarkable penetrating power. Whitney, the highest peak in the United A half -inch of lead is required to shield a States. It is almost unneccesary to state that person from the effects of the known gamma his instruments were far more accurate than rays. The very fact that the new rays re- the simpler one drawn here, being equipped quire 6 feet of lead for the same purpose, is with an ingenious arrangement of moving proof of their great power and short wave- film to photograph the rate of discharge. length (Fig. 4). Though hundreds of feet deep, the main EARLY EXPERIMENTS source of its water was from the melting Professor Millikan's experiment was the snows -a necessary condition, for if its water culmination of an investigation covering a had come long distances underground it period extending over a number of years. probably would contain large quantities of The effects of these rays were first felt as dissolved radioactive salts which would pro- early as 1903, when the British physicists, duce the same effects and detract from the Rutherford and McLennan, studying an value of the measurements. It was found electroscope, found that the rate of discharge that the electroscopes did not stop discharg- could be lessened by enclosing it inside a CHARGE D (a) DISCHARGED (b) ing until at a depth of 45 feet below the box of thick metal. Fig. 5 shows an FI G. 5 surface of the lake. The air above the lake electroscope. A is a metal rod from which was equivalent to 23 feet of water and the A standard type of electroscope in a charged total, 68 feet, was equivalent to six feet of are suspended two gold leaves B. The jar and discharged condition is shown in the illus- C is often of glass. When an electric charge trations A and B respectively. The text tells lead, proving the remarkable penetrating is brought near the ball on the ton of the how this instrument aided in detecting cosmic power just mentioned. rod A, some of it is conducted down the rays. (Continued on page 1147)

www.americanradiohistory.com 1093 Science and Invention for April,1926 9 99 IS GREATEST NUMBER 99 IS 9X9X9 ETC 9X9X9 WE CAN WRITE 9X9X9XSX9X9X9X9X9 Greatest Three Figure WITH THREE 9'S 9 TIMES 387,420,44 9 TIMES IS 999 OR WITH 389,693,100 387, 420,489 THE RESULT IS A NUMBER Number FIGURES -THE FIRST IS 4,THE LAST FIGURE OF IT IS 9 greatest number that can possibly be written with three figures THE in is that indicated above. It was calculated by M. Laisant Paris in the Ecole Polytechnique that the result is a number with 369,- is a 4, and 693,100 figures. The first figure of this tremendous group MORE THAN 28 last one is a 9. YEARS TO WRITE the by it- Nine to the ninth power indicates that nine is to be multiplied NUMBER, STILL indicates that the self nine times. Nine to the ninth, to the ninth power, WRITING is to be multiplied by itself nine times, giving a figure of first exponent or in 387,420,489. Then the first nine is to be raised to this power other words is to be multiplied by itself 387,420,489 times. Were one writing this tremendous number, he would require a length man to start figure of paper about 919 miles long, assuming that he spaces each a distance of one -sixth of an inch from its adjacent fig- ure. The paper tape would very nearly stretch from New York to Chicago. The necessary time to write this number would be twenty - eight years and forty-eight days, assuming that the in- dividual wrote one figure a second, ten hours a day PAPER ON WHICH FIGURES ARE every day in the year. WRITTEN WOULD STRETCH In all mathematical prac- FROM NEW YORK TO tice it is the custom to re- CHICAGO move the outermost condi- % the tions first. Consequently I 1 ll1 first exponent of the nine is dY/Hd/MAY i/- /í ii' u, raised to its power first. i. i HUBERT SLOUKA, Rep. No. 7110.

leX - Údi It will take more than twenty -eight years to write the re. suit of the calculation indicated in the upper left -hand cor- ner of the article. /'1q1

Undersea Volcanoes infernos in submarine abys- ETERNAL TAKING SOUNDiNG>S ses, where titanic masses of water meet THE CHALLENGER of the earth's IN Trit NORTt1 ATLANTIC the unquenchable fires OCEAN interior, have recently been discovered and described by M. J. Thoulet of the Paris Acad- Sl12FACE emy of Sciences. Vast explosions, billows of steam under the ocean floor, miles deep, roar- ing and bursting of natural furnaces -these fiendish activities liberate huge quantities of volcanic matter and distribute it along the lower reaches of the watery depths. This happens especially in regions of the North Atlantic where it has often been suspected that the sea bottom contains volcanoes. k'OI_CAI ïiC gA!SIN ---. M. Thoulet arrived at these conclusions taken through his study of the soundings WATER ABNORMALLY aboard H.M.S. "Challenger" on its recent the world. DENSE, DUE TO oceanographic expedition around TER He found that certain materials in solution VOLCANIC MA T in the sea -water at great depths became dens- SOtUT_ION - er in some regions than in others. This un- usual density, he concluded, can be explained only by the existence of submarine volcanoes, which give out materials which dissolve in the water. Thoulet now hopes to be able by his meth- ods to locate the exact position of some of these submarine volcanoes, and perhaps to measure accurately the degree of their activ- ity. At any rate, it is a quaint and startling notion for travelers to Europe to entertain - seething battles of fire and water far in the depths beneath them. Perhaps 'also this vol- canic power will be harnessed some day -for submarine power stations for trans- atlantic liners -who knows ?- ERNEST BRENNECKE.

www.americanradiohistory.com 1094 Science and Invention for r1pril, 1926 Reaching Great Altitudes Many Precautions Must Be Taken and the Special Apparatus Used Is Illustrated

OXYGEN REGULATOR FELT OXYGEN MASK CORDUROY E3o'T7LE5 HELM _T PAi?ACMUTES

Above: The appearance of a plane especially equipped and designed for high altitude work. Note thickness of wings, and large propeller.

Above: A cross -sectional view of the cockpit of a high altitude plane. The pilot is supplied with oxygen from tanks in order to sustain life, while the cockpit is electrically heated and insulated with felt corduroy. Left: New type of geared Liberty motor equipped with supercharger and air cooling system for flying at the absolute ceiling, where the air is very rare and makes flying difficult.

F> E. t?íAME.TER:ANCs MI H PITCH F'RA'PEi_i 5 TrtICK HIGH LIFT WING SECTION` .SUER IelARGE.R.

When traveling at great altitudes, an ordinary gasoline engine will not function properly. Due to the rarefied atmosphere, such an engine will not obtain sufficient oxygen. Therefore, a super- charger or rotary air turbine is employed to compress the air and furnish it to the motor in the same quantities and at the same pressure as is obtained at sea level. During the process of corn - pression and because of the fact that the supercharger is driven by the exhaust gases, the compressed air becomes very hot. It must be cooled before it enters Black portions above show approximate proportions of standard the intake manifold, and this is done by means of the cooler located directly in airplane, whereas the shaded parts show where dimensions must front of the supercharger in the above photo. The pressure delivered by the supercharger is be enlarged for high altitude flights. controlled by the operator of the airplane.

www.americanradiohistory.com 1095 Science and Invention for April, 1926 New Plane Seeks Altitude Record By WILLIAM P. SULLIVAN, Aeronautical Engineer for the altitude in THE latest design in high altitude hot supercharger, and has to be cooled be- thrust is most efficient fore it enters the intake manifold. This is which the plane is flying. This pitch of airplanes, using a special super- adjusted until Liberty motor, is being done by passing it through a cooler, which the blades can be continually charged cooled it also reaches a limiting point of efficiency. tested by the United States Army is similar to a water radiator, and the pressure, enters the is the wing at McCook Field, Dayton, Ohio, in hopes of air, under the desired The next important feature to the United States the carburetors. This pressure is controlled design. The limiting factors of this por- bringing back operating a relief to world's altitude record, now held by M. from the pilot's cockpit by tion of the plane are flexible enough who attained an alti- butterfly valve situated at the rear of the allow a design of high efficiency in rarefied Callizo, a Frenchman, to feet in a specially constructed supercharger. As the plane continues air, while at sea level the loss of speed tude of 39,586 this valve is airplane, designed to meet conditions at high climb in rarefied atmosphere, would be most noticeable, due`to the greater has many new gradually closed so that finally all the air resistance or drag, caused by the greater altitudes. This new design to features, including a specially constructed sucked in by the blower goes directly atmospheric pressure and a loss of lift, due interior completely lined the carburetors. As the altitude increases, to loss of speed, but not enough to be of cockpit with its the motor with plywood, covered with a quilted felt the pilot adjusts the valve, keeping paramount importance. As the plane ac- heated to with- running efficiently, as one might adjust a quires altitude, the lift- over -drag ratio would corduroy and electrically a stand the terrific cold. The propeller is of carburetor on an automobile. Finally, increase until it reached its most efficient constructed from aluminum limit is reached by the supercharger, and working point, equal to that of the power large diameter, of the motor alloy and having variable pitch blades, which from this point up, the power plant. are adjustable from the pilot's cockpit. The begins to decrease, until the power delivered The pilot must be considered as to his and of a special, thick, by the motor does not produce thrust enough cockpit must wings are very large to comfort and equipment. The high -lift section, having an area of 600 to drive the plane at a speed sufficient be enclosed as much as possible and lined square feet, with an aspect ratio of ten. lift. This point is called the absolute ceiling with a warm covering of heat -retaining ma- of machine of this sort lies of the airplane. with sufficient oxygen to The heart a for the terial and supplied in the ability and efficiency of the motor The propeller, which is designed facilitate breathing in the rarefied air is next to function properly in the rarefied atmos- power -plant of high- altitude planes, throughout the climb. This oxygen is car- altitudes. To bring this about, to be considered. A propeller adapted to ried in a number of small metal bottles, phere at high be of the motor is equipped with a special super- work efficiently at high altitudes must coupled together and connected through a charger, which maintains a constant sea - large diameter, large wing area and high regulator valve, to a specially heated helmet level pressure of the atmosphere at all alti- pitch, which would be useless at sea level. and mask fastened to the pilot's head. The tudes, enabling the motor to operate the This is due to the fact that, being designed flow of the oxygen is controlled by the pilot same at altitudes of 30,000 feet or more, as for rarefied air, the air at sea level offers by adjusting the regulator valve. a resistance, so that the revolutions it would at sea level. too, great In climbing to the high altitudes, the pilot consists of a turbine - per minute would not be enough to furnish This supercharger the is kept busy adjusting all these instruments, driven blower connected directly to the ex- the thrust necessary for flight. Up to sacrifice of high altitude effi- due to a steady changing atmospheric pres- haust and intake manifolds of the motor. present time, a he must keep the oxygen has had to be Made in order to enable sure; especially, The turbine derives its power from the ciency system adjusted according. to the height, exhaust gases of the motor, which, in turn, the plane to leave the ground. of the new design has what which is absolutely essential to sustain life; rotates a blower pump. The entire super- The propeller also, the heating appliances that supply heat charger itself becomes very hot, because of is known as variable pitch blades, that is, at the ]ib, in to the pilot's body in the extreme cold are the use of the exhaust gases, and this heat the _blades rotate in sockets establish the to change their pitch while in flight, to be under control. Hence, to is radiated out by air -cooled fins about order record means a man -size job, from blower, and are controlled by the pilot from the a new altitude turbine. The compressed air the both on the part of the pilot and -of the becomes hot, due to both its rise cockpit. This 'enables the pilot to set the in turn, where the engineers, who all join in accomplishing it. in pressure and to its passage through the blades at any desired pitch angle, Distribution of Electricity

!Tillalrot ELEC. 4-- REFRIG- 17, 000,000 ERATOR

ELEC. LGT.& 1 t POWER CUSTOMERS IN U. S. 41t- I .-- . gis! 14,000,000 I -ELEC.RÉFRIGERATION NOME USERS I IT IS CLAIMED WILL REVENUE. REMAINING DOUEILE OF ELEG.LGT.& 3,000,000 POWER C0'S, COMMERCIAL I AND INDUSTRIAL USERS

1

year. If electrically operated refrigerators are installed in all homes, the The average person will undoubtedly be surprised to learn that the largest this country is the home user. Out of yearly electric light bill will be practically doubled, but at the same time, consumer of electrical current in as to that by ice will of them are in homes throughout the the cost of refrigeration by electricity compared 17,000,000 customers, 14,000,000 be substantially less. country. Today, the average electric light bill is approximately $25 per

www.americanradiohistory.com 1096 Science and Invention for April, 1926 New Electric Refrigerator

COOLING TANK

FREEZING CHAMBER, FOR (CE CUBES AND FROZEN DISHES --t -- 1 i

A new electrically operated refrigerator that is entirely self- contained is The refrigerating substance that is used in this modern "ice box" is used illustrated above. A small compressor located in the base compresses the over and over again and lasts for many years. The photograph above refrigerating gas to a liquid which, expanding subsequently and at a very shows an interesting experiment performed with the liquid substance when low temperatures, circulates through pipes around the food compartments it is at a temperature of 10° below zero. When poured into water, an and the freezing chamber. An automatic temperature regulator keeps the "ice explosion" takes place. This photo was taken at a speed of 1- 1500th temperature constant. of a second and the explosion took place in just that time. New Photograph Accessories

NEW instantaneous range finder that A is designed for use on small hand cam- eras is illustrated in the photograph in the lower left -hand corner of this page. By looking through the top of this instrument with the eyes quite close to it, the object upon which the photographer is focusing will be seen broken up into three distinct parts. If the camera is not focused prop- erly, these three parts will be out of line as shown at the left, but when the lens is brought into proper focus the three sections line up as in the extreme right -hand dia- gram at the left. The range finder must be designed for the lens in use.

-FOCUSING enlarging device ASELFdesigned especially for the amateur photographer is illustrated in the photograph at the right. The light necessary for en- largement is supplied by an ordinary in- candescent bulb connected to the house light- ing circuit. The film or plate to be en- larged is slipped into a convenient and readily adjustable holder and placed in the camera directly above the bellows. By pulling the device up or down on a specially designed rack, the picture can be made as large or as small as desired within the lim- its of the apparatus. An ingenious cam ar- rangement keeps the focus constant, and no adjustment of it is necessary.

www.americanradiohistory.com Science and Invention for April, 1926 1097 The Story of Coal By J. E. BYRON, Mining Engineer

CLAYS ANI?.SkiALES. COAL 73 WOOD SO% PEAT 5510 LIGNITE COAL

BITUMINUS

I I I 1 I I I {.,, ANTHRACITE COAL 84% COAL 93 %,

Forests and plant life of the coal period were The depression was filled by clay which gives The amount of carbon that is found in wood, in deposited in water, and formed a constituent of shale, and the covered vegetation formed coal. peat and in various kinds of coal can be seen bogs like peat bogs of today. Amount of covering pressure and heat deter- above. Anthracite is richest in 'carbon. mined the kind of coal.

=1

The first use of coal that historical records show Bituminous coal was first discovered in the The available coal in the United States would was by the ancients living in about the year 300 United States in an out -cropping near Rich- form a wall one mile square in cross- section B. C. It was used in open fires. mond, Va., in 1750. The vein ran about as reaching from Chicago to New York. shown above.

(AMMONIA NAPTHALENE'ßALLS'

Wr e= 11. 4/A CARBOLIC ACID -".tiii..ra®.r.b. r" +. tirszt:Maaasatrua.wü.tauaaaav DYES- YiHalmml=aa0/YitIl.wsOINr\ R.rrfra. ` PER FUM E 5 éisüsriittanumilitf.taaiiiiii iúiiéáá f.aiaea\afralrrf w ®lams.\umnieu.talt.a4mNa1a61.1111111111mH.af..itw m ACETANILIDE i Yr 1OINIYSaOIH111111..e..r... SACCHARIN(300 TIMES SWEETER THAN 'SUGAR)

There are at the present time 600,000 men em- When coal is treated in coke ovens, it produces When coal tar is properly distilled and treated, ployed in the coal mines of the United States. coke and also gives forth coal tar, many prod- it produces many valuable products, a few of the They supply us with most of our fuel. ucts of which are useful. most important of which are listed above.

When coke and sand are melted together in an If, on the other hand, coke and limestone are ig- Artificial gas is produced by heating together electric furnace, carborundum that is used for nited together, calcium carbide is produced from coke, steam and oil vapor in a furnace as is grinding purposes is produced. which acetylene gas is obtained. shown diagramatically above.

www.americanradiohistory.com 1098 Science and Invention for April, 1926 Awards In $5,000.00 Matchcraft Contest

Samples of Matchcraft 'GA Were Built With Matches =arrvi What Can Pou Do with Matei 1,40 Weekly In cash. - First Prise, $100 What Can You Do 'With Matches? Peewit Prise, $I& Twenty Prh.l..¡. $250 Weekly in Cash Prizes

Frust Prize. $100 Sand Prise,, M. Twenty Prisw, S5 Euh

UKELELE WINS FIRST PRIZE First Prize $100.00 -The uke- lele made by Gene Allen, of Independence, Mo., won the

first, . prize in this month's awards. It is shown on this page, together with newspaper clippings from New York's daily papers.

New York Evening World contest Note to prize what winners ex- will be tent the entered "match- craft" in the contest national o is appeal- SCIENCE ing to AND IN- the gen- VENTION "a eral pop - Contest. ulace. °" :"r e S,2:11 r atlihnt *en. w.,'. .:......

The New York Evening World is conducting a Matchcraft contest of their own, operating in conjunction with SCIENCE AND INVENTION Magazine and offer- ing an additional $1,000.00 in prizes. The winners in that contest will be automatically entered in the SCIENCE AND 1NVENTi,N National contest. $5.000.00 Prize "Matchcraft" Contest WATCH FOR PRIZES IN MAY ISSUE

FOR the next ten months, SCIENCE of the model itself. The best models submit- (9) Where SCIENCE AND INVENTION AND INVENTION magazine will award ted each monto will be awarded the prizes has any doubts as to the model (where photos a total of $5,000 in prizes, in a new con- scheduled herewith. only are submitted) complying with all the test. You are asked to make models, fashioning regulations, the judges may, at their discre- the same entirely from safety matches. Please tion, request that the actual model be sent in observe the following simple rules: for inspection, paying transportation charges (1) Models submitted must contain at least both ways. 90 per cent. safety matches in their construc- 16 Monthly Prizes (10) This is a monthly contest, lasting for tion. twelve months, each monthly contest closing (2) Models made of toothpicks, paper First Prize $100.00 on the first of the month following dafe of

matches, or non -safety matches, 'are not elig- Second Prize . 75.00 issue. This contest for the month of April ible in this contest. Third Prize 50.00 will close May -1, 1926, and prize winning (3) Models can not be built around boxes announcements will be made in the July, 1926, or other supporting articles. Walls, roofs, Fourth Prize 35.00 issue. The May issue will contain February etc., must all be self- supporting and made of Fifth Prize 25.00 prize winning entries. matches. Sixth Prize 20.00 (11) Models must be shipped in a strong (4) All liquid adhesives, such as glue, shel- wooden box, never in a cardboard box, as lac, cements, etc., are permissible. Seventh Prize 15.00 SCIENCE AND INVENTION can not be Water Glass makes a good glue and may be Eighth Prize 12.50 held responsible for breakage in transit due to used to coat the model giving it a glasslike models having been improperly packed. appearance. 9th to 16th Prizes of $10.00 each $80.00 (12) When models are Sent, be sure to affix (5) Models may be painted, gilded or sil- tag, giving your name and, address, to the vered. model itself. In addition, put name and ad- (6) Models may be of any size. dress on outside wrapper of package. (7) In order to win a prize, it is necessary (8) All models submitted to SCIENCE (13) Address all letters,- packages, etc., to that either models be submitted, or, if this is AND INVENTION Magazine will be prompt- Editor, "Matchcraft" Contest, care SCIENCE not practical, owing to their size, a 5 "x7" pho- ly returned to the builder, who will prepay all AND INVENTION Magazine, 5 3 Park Place, tograph of the model may be sent in lieu charges. New York.

Caution-Soak or cut heads from matches before building your model so that the models may be expressed or mailed.

This is a monthly contest offering sixteen prizes every REMEMBER- month. Don't hesitate, send in your model now !

www.americanradiohistory.com 1099 Science and Invention for April, 1926 Prize Winners in the February Contest

e RELAY SWITCH MAGNET COILS ATnE ARMATURE FORK PIVOT 2,

PU LEY- INTEGRA WITH PARAI CL WITH. M VIEW 0V CHASSIS SOTTO CLUTCH DISC SLIDING ON MOTOR CIRCUIT DR VCR SHAFT

CLUTCH ASSEMBLY -E

MAGNETS 0 FtR4TG 1;7iLTCH

_ TRIGGER TU Ì Lt. AST CAP

The car rolls on two ball Second prize $75.00 was awarded to J. The roller coaster, winner of the second prize award in teen and a half inches wide. of Washington, D. C., for this month's contest consists of a tower from which the bearings which also serve to make the contact for the S. Buynitsky hoist. Car the scenic railway above. It took six car starts at a height of fifteen inches. There are six- relay and the motor operating the entering weeks to make this model. teen feet of track and an automatic elevator which elevator car A, causes steel balls to make contact raises the car from the bottom of the tower to the across B, closing relay circuit operating magnet C, starting point. The entire device is automatic. The which pulls down knife switch D, completing circuit matches were boiled and bent on phonograph needle through clutch assembly E, and motor. The drum winds forms to produce the curves and were then trimmed up lifting car to top, by gravity when clutch opens, due with sandpaper. The model is fifty inches long, thir- to circuit being opened.

Eighth Prize $12.50- -was award- Third Prize $50.00 ed to Dr. Charles -was given to Mr. F. Bassett of Chi- E. Morgan, of cago, Ill., for the New York City manor lift gate for this splendid her e illustrated. model of a church. The design is or- Even the interior iginal. of this model is complete to the pews, and altar.

Sixth Prize $20.00 -The owl wall piacque shown in the photograph above was made by Dr. Ernest Bade of Glen Head, L. I. Dr. Bade employed unique construction. Ninth Prize - $10.00 - was won by the wheelbarrow I IY= construction CI illustrated in 'É l T .. . photo 5 above. V This award goes to Mr. Fred Spinden of Abingdon, Illinois. It will Fifth Prize $25.00-Mr. Eugene be remembered Herbert of New Rochelle, N. Y., that Mr. Spin - made the airplane which the den won the judges considered worthy of the third prize for fifth prize in this month's con- his wagon con- test. Note with what care the won by Benedette of struction in the Twelfth Prize $10.00 -was John were laid in place. Most of the heads were cut from the matches model of the Garabit Viaduct March issue. matches New York City for the and the entire model was carefully sandpapered so as to make it smooth. bridge. Cross section of the earth is made of matches.

www.americanradiohistory.com 1100 Science and Invention for April, 1926 More "MATCHCRAFT" Prize Winners

Sixteenth Prize $10.00 -The picture frame illustrated to the left won the sixteenth prize for Miss Henrietta Abramson of Brooklyn, N. Y. The matches were laid in place very carefully in a self- supporting frame. Hinged to the back of the picture frame one will find a support which holds this picture frame in an upright position. The thatches for the corners of the frame have been cut up, so that the pattern illus- trated can be formed and the back ends of the matches have been tipped with tiny drops of red paint, giving a dodble headed match effect.

Fifteenth prize $10.00 -The battleship illustrated in the photograph above won this award and the lad who built the same is only fourteen years old. He is Master E. Don Bailey of Columbus, Indiana. Although the model is not complete in every detail, great care was taken to make the mu! iIII11111111111IM111II ship smooth and present a more or less professional appearance.

> Tenth prize $10.00-Mr. W. S. Hendren of Nichol - asville, Kentucky, sends us the model village il- lustrated in photo 12. In this village everything is constructed of matches; even the trees in the fore- ground are made by shav- ing into the sides of a match producing leaflike growths. The automobile, wind mill, garage, houses and fence are all con- structed entirely of match- es.

A model village is illustrated Fourteenth prize $10.00 -Mr. Harvey Bixby of above and a lamp stand be- low. Laporte, Indiana, took a lot of time to build lr the log cabin illustrated above. At first glance itlAÍxfé///r it would not seem as if this model is difficult to Áli construct, but every match has been so cut that ' lflilllRÌÚñ';Fu it dove -tails with the match crossing it. Olin

Seventh Prize $15.00 -In the construction of the Zeppelin frame work illus- Fourth prize $35 trated in photo 13 above, -It is really Mr. F. E. Wilson of Cov- surprising t o ington, Ky., used up two note how strong thousand five hundred mat- a well construct- ches in building this three ed lamp stand foot model showing only can be even the skeleton framework. though it is The small cars suspended made entirely of from model are also com- matches. Mr. A. posed of matches as are W. Kingman of the propellors. Nothing Hammond, Ind., but matches re- enforces the showed us how model. this should be done and thereby won the fourth prize in the na- tional match - craft contest. A little time, a few matches, a pot of glue and you can also win some of these Thirteenth prize $10.00 -The model of a Eleventh prize $10.00 -In photo 15 above we prizes. Try it; wall clock illustrated above was made by see a model of an Oklahoma pumping station 4 Charles Komunicki of New York City. In which should be fairly accurate, inasmuch as the last issue his automobile won one of the it was made by Mrs. W. S. Greenlie of Homony, awards. Oklahoma.

www.americanradiohistory.com Science and Invention for !l pril,1926 II0l Telephone Amplifier for the Deaf

The latest aid to the deaf has recently been developed by the Bell Telephone Laboratories and has been designed in two different forms. Not only is the © Bell Telephone Labs. system adaptable to assist the deaf in ordinary conversation, but it can also be employed in connection with a standard telephone, so that the patient can hear more plainly. The device, in connection with a microphone is shown in Here the new system is connected with an ordinary telephone. Amplification use above. is obtained by using vacuum tubes in a standard circuit.

. Peanut 7 W -2 vacuum tubes Vacuum tube t amplifier Microphone

Amp /ifymg -- .,. transformers etc. Each receiver shaped p p to fit patient's eaB Battery io /iñe 'Receiver (May/cling wax 't Amp //lying ; ' \ ^ Hardened transformer 1l_l wax mold (Magnet `-AT7/if/èr

Sound volume Fema/emo/4 hraM regulator The instruments used in this new deaf phone are shown above and the method Here the vacuum tube amplifier is connected in the receiver circuit of an ordì- of making the small ear pieces is also illustrated. nary telephone so as to render reproduced conversation louder.

Camera Aid A Musical Talking Machine

Left: The newly developed musi- cal talking machine opened, show- ing record table, reproducer and strings. ulumuumumml ' I STRINGS VIBRATE WHEN IN RE- EXTENSION'' LOCK BAR PRÉVENTS SPRINGS PUSH ARM UP SONANCE WITH ON SPOOL MOVEMENT OF SLIGHTLY WHEN FILM MUSIC., RELEASES THIS ARM SPOOL LUG RELEASES LOCK LOCK BAR Very often the amateur photographer fails to wind the film after having taken a picture and consequently makes a second exposure on the same frame. This is prevented if the de- vice shown above is employed. The lock bar, which is retracted by a projection on the winding spool, prevents another exposure after one has been taken, until the take -up e o spool is turned. The secret lies in the springs allnllmmmnNllll shown in the right -hand drawing above. -A. C. Fischer. IIII[IVtl. TUNING PEGS' In a novel type of talking machine that has recently been placed on a foreign market, the sound waves set up by the action of the record -\ on the reproducer needle are given forth through the strings on the sounding hoard iré shown clearly at the right. The waves vibrate ` Above: A diagramatical view of this new these strings and lend an unusual tone to the musical instrument. Note the form taken consequent reproductions. The p by the strings so that all of them will pass strings are over the mouth of the horn. Aside from kept in tune in the same way as a piano and this string attachment, the rest of the in- those in resonance with the sound waves are strument is designed along conventional set in vibration. I- phonograph lines.

www.americanradiohistory.com 1102 Science and Invention for April, 1926 Photos from the Scientific World What Scientists Are Accomplish- ing and Discovering Left: Concrete cross ties for railroads have been adopted by the Bangor and Aroostook Railroad, replacing the ordinary wooden ties which in that locality are scarce and very ex- pensive. The new ties are very satisfactory.

Another triumph of German ingenuity is de- Below: A new system for obtaining elec- picted in the photograph reproduced above. trical energy from the air has been devised 1 Gigantic halls, constructed entirely of concrete, by German scientists and the tower illus- have been constructed and are in use for the trated will be erected at Leipzig. It win preservation of crude sulphur. All of the be the highest structure in the world, supporting beams as well as the cross pieces towering to 1,800 feet above the surface and other girders are of reinforced concrete. of the earth, or 300 feet higher than the The total length of these halls is in excess of tEiffel Tower. The rotating wings it is said 300 feet, the width is somewhat greater than will generate power steadily, regardless of 60 feet and the height is about 50 feet. how little wind is blowing.

A specially designed trans- former shown in the pho- tograph at the right has recently been installed in the California Institute of Technology. It delivers one million volts and is capable of producing sparks of enormous length. One of these sparks, pro- duced between a point and a ball is shown above. Note the flaming effect produced. The purpose of this installation is to test insulation values, to pro- duce artificial lightning for demonstration and to conduct experiments with radio transmission of power. Above: A view of the elec- trical laboratory of the Cali - \ fornia Institute of Technol- ogy.

a

'i ne illustration at the right shows how the natives of Mon- golia build their homes. A framework of sticks is first con-44.0.-4.. strutted and then covered with a thick felt made from sheep's wool. The door is especially unique in construction as it does not open outward or inward but folds together after the fashion of an ordinary elevator door. In fact, the entire hut is made in a similar manner so that the walls can be folded up and the home transported to any place desired. The construction is plainly shown. CAmer. Museum of Nt. History.

www.americanradiohistory.com Science and Invention for April,1926 1103 The Month's Science News Illustrated By GEORGE WALL

Left: A 36 -inch lifting magnet was recently carried back and forth over a 7 -mile stretch of road and it picked up 603 pounds of nails, tacks and scrap iron in that distance. AIR BEING PUMPED, Below: For a long time, people near a certain power house were greatly annoyed by a mysterious hum. Numerous scientific investigations failed to locate the cause, but finally PUMP a workman placed a sheet of tin in the ash pit of a boiler and the hum 4, stopped.

MOT.O. LIFTING AGNET Above: After LS ETC. living for a week in a seal- ed room and breathing the same air con- tinually, t h e experimenter's blood turned blue.

WET BLANKET

LEG OF be MUTTS -4. A new type of thermostatic alarm device to used for protecting safes has recently been de- veloped and it is so sensitive that it will re- $1 E AM spond to imperceptible changes of temperature. When a person enters the room in which it is concealed, the alarm sounds. It would cer- tainly take a cold-blooded burglar to rob a safe protected with this device and even then, if he used a blow torch, the heat of that instru- ment would immediately sound the alarm.

The original principles of cooking are still in use among certain savage tribes and one of the most important of them is illustrated above.

BARN. SHAFT GUARD SHIELD RAIL

TRIP GR MUVIt SCREENy

RECEIVING STAGE /11 SET BALL ROOM FLOOR

6 LOUD PROJECTORVI/ ¡ SPEAKERS FIRE APPARATUS A combination of radio and motion picture has re- cently been perfected and a demonstration given in New York City. Motion pictures of a well known orchestra in action were shown and the accom- When fighting a fire in a small town, the water paniment was supplied by radio. supply gave out and inasmuch as other buildings were threatened with destruction if something drastic was not done, the firemen poured cans of milk into their pumps and forced the lacteal fluid through the hose and directed the stream against the fire. Loads of snow were also pressed into service and shoveled into the fire in an attempt to prevent its spread. AIR AUST

In a large newspaper office, stairways have been eliminated and communication be- the tween various departments on adjoining In the accident illustrated at the left, one of upon an animal instinct which is floors is effected by means of an installa- miners relied A man equivalent to that prevalent in human beings, tion such as that shown above. first on the lower floor and wherein self- preservation is supposedly the enters the shaft one of is raised to the next floor by law of nature. This miner, knowing that immediately pulling the cars of ore means of the pneumatic elevator shown. An explosion in a mine recently claimed numerous the mules employed for installation is automatic. Re- miners, but one of the miners owes his existence would get out of the mine if there was any possible The entire the animal's tail and turn is made by sliding down a brass tube today to his presence of mind when he grabbed chance of doing so, grabbed such as used by firemen. the tail of a mule and was dragged to safety. was saved.

www.americanradiohistory.com 1îO4 Science and Invention for April, 1926 Tarrano the Conqueror TENTH INSTALLMENT By RAY CUMMINGS First American and Canadian Serial Rights CHAPTER XXIII at the Water Festival was not clear to warning glance, and the steadying odor THE. FIRST RETREAT Elza ; she did not know what was impend- which Maida wafted to her, she knew that MUST recount now what Elza later ing, but as she sat there with Tarrano be- Tarrano was using the alcholite fumes to told me, going back to those moments side her, a sense of danger oppressed her. intoxicate her. when Elza sat upon the balcony watch- Danger which lay like a weight ,upcin her The Red Woman and Tarrano were upon ing. Tarrano and the Red' Woman. The heart. Yet several times she found herself the dais. There came a flash; then dark- significance of what had been transpiring laughing-hilarious; and from Maida's ness. Elza went cold with terror. She sat stiff and silent, while around her surged that turmoil of confusion. The smell of chemicals was in the air ; her skin prickled as with a million tiny needles where sparks now began to snap against it. How long she crouched there, or what was happening, Elza did not know. But presently she heard Tarrano's voice in her ear. "Come, Lady Elza, I must get you out of th:s." In the darkness his face glowed wraith -like. Then she felt his hand upon her arm. "Come, we must leave here. I would not have you endangered." With a haste and roughness that belied the calm solicitude of his words, he pulled her to her feet. There was light in the pavilion now. Elza saw dimly the turmoil of struggling figures ; and then she saw the scene duplicated -saw it shift and sway in crazy fashion. Though she did not know it, she was looking out along the curved rays which Tarrano was sending from them. Sparks were snapping every- It swung into the air in a slow, lazy parabola, came down and dropped into the lake. But it fell where. A second image of Tarrano ap- where the marksman saw the boat, a safe distance to one side. A ball of fire dropping into the it for a distance of a dozen feet. peared to the left of her -she saw it in a water, exploding the water all around mirror nearby-yet he was at her right, gripping her arm. "Hurry, Lady Elza." SYNOPSIS to Venus to where Georg and the Princess She found herself being dragged along Maids have previously been transported. the balcony; stumbling over a body lying N the spring of the year 2325, all of the They are royally welcomed and go to the heat rulers of the various countries of the earth palace of the Princess Maida. Here they there; feeling a surge of and electric are mysteriously murdered. Jac and Gray- are attacked by Argo, one of Tarrano's disturbance beat against her face. Then son, employees of a large news organization, men, who shoots a violet -colored beam of Tarrano had her in his arms, carrying her. find that the murders are the result of a plot light across the room, separating Maida heard him curse as a sudden wave of on the part of the inhabitants of Venus. Tar- from the rest of the party. He threatens She rano, an erstwhile lower official of the Cold to kill her, when suddenly Wolfgar throws fire seemed to strike them -hostile rays Country of Venus is found to be at the head himself into and through the violet beam bringing a numbness to muscles and brain. of a plot to rule the universe. of death. Tarrano was fumbling at his belt; and Dr, Brende, a friend of Jac's has discov- Wolfgar dies soon after he confesses to he stumbled ered a medical method whereby human be- Maida that he loves her and Maida has through a shower of sparks ings may be kept from growing old. The made a similar declaration. With great onward with his burden. Doctor is killed by a group of "Venus -Men" pomp and ceremony, the body of Wolfgar Elza's senses were fading. Vaguely she and Jac, Elsa, the Doctor's daughter and is laid to rest in the WATERS OF was Georg, the Doctor's son, are captured and ETERNAL PEACE. was conscious that Tarrano carrying taken to Venia, a city on the earth inhabited The evening after the burial of Wolfgar, her down an incline to the ground. Grate- by people of Venus. Here they are impris- Jac chances to be alone in a small boat near ful, cool air. Stars overhead. Trees ; foli- Wolfgar, a Venus -man, friendly oned and the palace and he is warned by a "slaan," age; shimmering water. . The screams to the people of the earth, surrounds them by a Venus man, to guard himself well. He an electrical isolation barrage in an attempt also sees below the surface of the water and to rescue them. The barrage is broken down encased in a diver's cap, the face of an and in the resulting confusion, Georg es- Earth man. Later that evening, prepara- capes to Washington in company with Prin- tions are rushed through for the great cess Maida of Venus. Water Carnival of Venus and to it proceed The next day, Tarrano offers to return the Georg and Maida; Elea and Tarrano; and papers and models of the invention made by Jac without a partner. They disguise them- Georg's father, which he has confiscated and selves with long robes and masks and soon brands young Brende as an impostor. To reach the scene of the festival. offset this accusation, Georg is to tell his At the carnival all of the inhabitants of story to the earth as well as to Venus and the planet are seemingly given over to the Mars by radio and helio. He and Princess pursuit of pleasure and love. However, Maida go to the station but there they dis- there is a vicious undercurrent of events appear. noticeable to Jac but which does not seem to Jac, Wolfgar and lima, stell captives, are claim the attention of Tarrano. At one removed from their prison and taken to the place there is a swimming pool in which girls top of an enormous tower. Here, in the in- are constantly sporting themselves. Watch- strument room, where communication with ing them, Jac sees one of them drag a Tar- the various planets is held, they view the rano guard to the edge and with him grasp- disappearance of the Princess Maida and ed in her arms, plunge into the pool. A few Georg by television. The abduction has seconds later the girl comes to the surface been done by Tarrano's agents. On Mars, but the man is never seen again. Tarrano's followers are attacking the ruling Toward the climax of the celebration, a Dr. Brende's secret notorious Venus character, the Red Woman, class and Tarrano offers performs a dance particularly for the benefit to the public if they will surrender to his an- of Tarrano. In the midst of it, the large cohorts. They agree. Tarrano then hall in which it is being held, suddenly is nounces to the earth people, that he will not darkened and rays of death shoot out over give them the Brende secret and declarer the place. Jac, forewarned, drops to the war upon them, challenging them. to attempt floor out of their range and throughout the to conquer him. entire assembly, "slaans" in the employ of The air war vessels of the earth govern- Princess Maida wreak havoc with their long ment start to attack Venia, but Tarrano knives. The cry goes tip, "Down with Tar- sends up a bomb of surrender dnd then,. rano. Loyalty, everyone, to your Princess with Elsa, Jac and Wolfgar, he escapes Maida." The Venus people. followers of through an underground passageway to a Maida, have revolted; the Red Wanian is upon a table a huge Slaan taken dead. but Tarrano Then abruptly, space -flyer. They go on board and are -P leaped -his garments blood -stained from his victims, a blade of dripping steel in his hands.

www.americanradiohistory.com Science and Invention for Apri1,1926 1105 and confusion of the pavilion growing surge of sparks; then Tarrano's red beam this flying with nothing above one, nothing fainter. . . conquered. ' It absorbed the white light. to the side, or underneath save that trans- When Elza regained consciousness, she And Tarrano's beam was curved. It lay parent substance. To her it was like float- was lying in the bottom of a little boat, over the lake in a huge bow, bending far ing, and at times falling headlong through and Tarrano was sitting beside her. out to one side. Yet its other end fell upon the air. "So? You have awakened? We are the hostile house. The white search -ray They rose no more than a thousand feet quite safe, Lady Elza." She and Tarrano were alone in the boat. It was long and very narrow, with its sides no more than a foot above the water. Tar - rano sat at its chemical mechanism. A boat familiar to us of Earth. A small chemical - electric generator. The explosion of water in a little tank, with the resultant gases ejected through a small pipe projecting under the surface at its stern. The boat swept forward smoothly, rapidly and al- most silently, with a stream of the gas bubbles coming to the surface in its wake. "Quite safe, Lady Elza." She saw that Tarrano's face was black- ened with grime. His garments were burned, and hers were also. He was di- sheveled, but his manner was as imperturb- able as ever. He made her comfortable on the cushions in the boat ; drew a robe closer around her against the rush of the night air. Elza was unhurt. She saw now, with clarifying senses, that they were plying along a narrow river. Banks of foliage on each side the auroral lights in the sky ; occasionally on the hillsides along the river, The arctic! It was nothing like the Polar regions of Earth. Stark desolation. A naked land seemingly upheaved by some gigantic cataclysm of nature, lying tumbled and broken where it the dim outlines of a house. had fallen in convulsive agony; and then congealed forever in a grip of ice. It was all a trifle unreal -like looking through a sunglass that was darkened -for around the boat hung always a vague pall from the house was submerged, bent out- at first, and then swept parallel with the of gloom. Tarrano spoke of it. ward with Tarrano's beam. From the ground. At a tremendous speed ; even at "Our isolation barrage. It is very weak, house, the observer could only gaze along this height the forests seemed moving back- but the best I can contrive. From these this curved light. He saw the image of ward as the ground moves beneath a surface hills the naked eye, now at night could the boat-not where the boat really was - vehicle. hardly penetrate it. . A precaution, but as though the ray were straight. Dark, somber forests of luxuriant trop- for they will be searching for us per- Elza, staring with her heart in her ical vegetation. It was now nearing dawn; haps. . . Ah! . . ." throat, saw a ball of yellow fire mount the auroral lights were dropping low in A white search -ray sprang from a house from the house. It swung into the air in the sky ; the great Venus Cross of Dawn at the top of a hill nearby. It leaped across a slow, lazy parabola, came down and was rising, its first two stars already above the dark countryside, swept the water - dropped into the lake. But it fell where the line of hills to one side. which at that point had broadened into a the marksman saw the boat, a safe distance Then the sky out there flushed red ; a lagoon-and landed upon the boat. It was to one side. A ball of fire dropping into limb of the glorious Sun of Venus came a light strong enough to penetrate the bar- the water, exploding the water all around up. A new day. And even though the rage -the boat was disclosed to observers it for a distance of a dozen feet. Like a air was warm, within Elza was a shiver. in the house. But Tarrano raised a small cascade, the water mounted. "It is very wonderful to me, my Elza, metal projector. A dull -red beam sprang Tarrano chuckled. "A very bad marks- this being alone with you." from it and mingled with the other. A man." He sat beside her, gazing at her with Other bombs came. It turns me cold his calm, impenetrable eyes. It was near when I think how orders like this could noon of that day following their escape have come from the Great City -these from the Water Festival. They had bombs which had they found their mark flown possibly two thousand miles. The would have killed Tarrano, but at the ex- Sun had risen, but after a time-since their pense of the life of Elza. They did not enormous speed and change of latitude had find their mark. Tarrano continually affected the angle at which they viewed changed the curve of his beam. The image it -the Sun now was hanging almost level, of the boat shifted. A few moments only; not far above the horizon. Hanging level, and riding the waves of the bomb -tossed and turning visually cold. water, they rounded a bend, back into the Beneath the platform -a mile below narrow river and were beyond range. now -lay a tumbled waste of naked crags. Tarrano snapped off his ray. "Quite The borders of the Cold Country! Tar - safe, Lady Elza. Do not be alarmed. I rano's stronghold! The birthplace of his doubt if they will locate us again. They dreams of Universal conquest. should be very busy now in the Great Elza was staring downward. A barren City. I'm surprised they could even think waste. Rocks bare of verdure. Grey, with to notify this Station we have just passed." red ore staining them. A desolation of We were indeed very busy in the Great empty rock, with grey flat shadows. And City during those hours, as you shall pres- far ahead, the broken, serrated ranks of ently hear. - mountains with rocky peaks, white -hooded Tarrano and Elza were not again dis- with the snow upon their summits. The turbed. How far they went in the boat Cold Country. Bleak; forbidding. she does not know, but at last they landed This brittle air was cold ; yet Elza and in a sheltered cove. An air vehicle was Tarrano were warm. Before the platform, there. Tarrano transferred Elza to it, and a ray darted -a low- powered ray of a type in a moment more they were aloft. that was to be so great a factor in the The vehicle was little more than an ob- warfare into which we were all so soon long platform, with a low railing. A plat- to be plunged. It heated the air, so that form of a substance resembling glascite- the platform rushed always through a wind transparent; and with a glascite shield V- that was balmy. shaped in front to break the rush of wind "What did you say ?" Elza looked up to and yet give vision. A mechanism, not of meet Tarrano's steady gaze. radio- power, but of gravity like the Space - "I said it is wonderful to be thus alone flyers. Such platforms had been, but were with you, my Elza." And then the sudden condensation brought no longer in use on Earth. Elza had never "Oh." She looked away. snow-a thick white fall of it sifting down . . . seen one. It was a new experience for her, (Continued on page 1136)

www.americanradiohistory.com 1106 Science and Invention for April, 1926

THE MAIN WHO MYSTIFIED Pres. Coolidge Prince of Wales. Ex- President t, Harding, Tat Roosevelt, Dunninger Will Attempt To Hypnotize Patient, and other celebrities 10 Miles Writes Exclusively for Away, by Radio SCIENCE FIND INVENTION

NO. 37 OF A SERIES

Invisible Transportation : In the diagram Handkerchief Production : In the diagram The Water Pitcher Load : A pitcher of below the method of making an object pass illustrated below the magician employs a water is seen standing in a wash basin as from one hat on one side of the stage, to unique end table, which contains a pocket in illustrated below. Water is poured from the another hat on the opposite side of the stage, its single supporting leg. Silks are pushed pitcher and immediately thereafter a rabbit, is clearly illustrated. The magician drops a down into this pocket after having been flags and silks are produced from the basin. watch or other object into one hat, taking securely fastened to the small cap covering No table traps are used. Notice that the care that it is hooked to the thread. Under the hole. Then he places one silk kerchief pitcher contains a compartment in the bottom cover of his body the watch is then trans- over the table and grasps it in the center, he which houses the load. The water is poured ported to the other hat. pulls the load away with him and produces it. outside of the compartment.

STRING PULLED-A CATCH -> BY ASSISTANT WATCH-0. OFF STAGE.

WATCH HIDDEN FROM AUDIENCE TABLE LEG- -> SILKS ETC. BY PERFORMER (N POCKET RABBIT,. FLAGS ETC. When the assistants behind the stage pull the string, the watch may be made to pass from With the above illustrated device it is a simple one hat to the other under cover of performer's Above is illustrated a clever method of securing matter to produce a variety of things from body. a load from an end table. a pitcher and basin of water. The Disappearing Lady Below we see a very interesting method of upon the same. The front and back ends of and the cloth collapses and drops to the stage making your female assistant disappear. The the cloth are then raised clear of the stage floor, the girl having completely disappeared effect is as follows. A cloth is laid over and the outline of the girl's body can still from mid -air. The girl rolls into a trap as an undraped table and the lady lies down be seen through the cloth. A shot is fired the front fold of cloth is raised. TRAP DOOR IN FLOOR

Vpurnny rp, r rn,

LAZY-TONG ,dh, : t ARRANGEMENT

I r/'{ ,M 4/p ` : u IN CLOTH ...... _.. :...° r -- LA _WWW1nt MIA-/ II I' " 1 U i IMI 'If The girl lies down on an undraped couch which has been covered with of fact she disappeared into the trap. The lazy tong arrangement in the a cloth provided with rings as shown. The front is raised and then the cloth makes the audience bel'eve that the girl is still concealed within the back follows. Apparently the girl is still within the cloth. As a matter suspended sack. This tong is collapsed when the cloth is permitted to fall.

www.americanradiohistory.com Science and Invention for April,1926 1107 Rat Contest Awards Fourth Prize, $25.00 -was awarded to R. D. Rabenold of Hillsboro, 'Iowa, for the IIIví method with which he was able to rid his farm of these pests. He merely painted stripes across the rats, as illustrated, and re- leased the rats again. Such painted rats are In the original announcement of the not welcomed by their brothers and the other rat exterminating contest, the edi- rats will soon disappear from the premises. tors made specific mention that they desired new systems for killing rats. No consideration, therefore, was given to those old chestnut methods, as for instance, sprinkling grain of any kind on water and the rats in attempting to get at the grain will naturally fall through the layer and

drown. - Feeding the rats plaster of Paris or cement in any food mixture AÿTG RAI' WM is also very old. Let us see how the judges assigned the $250.00 in awards.

Catching the rat alive, painting stripes upon its body and releasing it wins fourth prize. Fifth Prize, $20.00 -was won by John G. Dengler, of Pittsburgh, Pa., for the poison gas system here illustrated. When the rat pulls down on the bait, the valve is opened The above photograph shows and the rat is killed. how rats are being extermin- ated in some of the foreign countries. This particular picture shows a professional rat catcher. The tank on his back contains poison gas, a hose connecting from the tank is pushed down into the rub- bish and then the bellows on top of the tank is actuated by means of a lever in the user's right hand. This gas means instant death to the rat pest.

A tank of poisonous gas fitted with a valve The photo at the right shows and released as indicated got fifth prize. four professional rat catchers and some of the victims. The Sixth Prize, $15.00 -was won by Juan P. gas acts upon the rats in- Stoddart of Arica, Chile, for this idea. There stantaneously halting them in is no danger to any merchandise nor any fear their paths and immediately of starting a fire. Four men starting- from killing them. four corners of a plot work to a common ¿enter spraying live steam on the ground. Second Prize, $50.00 -was won by Gregory Bowden of San Luis Obispo, Calif., for the suggestion for poisoning rats using an egg as STEAM bait. It is a well known fact that rats like eggs and they will carry those eggs down into their nests to feed their young upon the con- tents. A tiny hole is pricked in the egg and poison is pushed into the hole. The hole is then sealed with a piece of tissue paper. The egg is placed where rats will easily get at it. The poison does the rest. o EÓóöE

The first prize was won by the rat trap il- The sixth prize winner suggested the use of lustrated above. It may be set for any num- live steam for ridding premises of rats. ber of rats by changing spring position. Seventh Prize, $10.00 -was won by T. First Prize $100.00 -was awarded to J. Sheley of Indianapolis, Indiana, for the rat Albin Hedberg of Chicago, Ill., for the con- trap illustrated below. This is a self -setting struction of the trap illustrated above. By trap which catches the rats alive. When the changing the position of the sliding spring rat nibbles at the bait he releases the floor beneath the floor the tension for the release beneath him which precipitates him into the may be varied, so that the weight LEAVE EGGS FOR of the door RATS TO GET AT lower compartment, turning the door through of one or seven rats closes the door. an arc of ninety degrees and resetting it. Pricking a tiny hole in an egg and then in- EMaaE RGT/LE wau cnusaR serting poison and again resealing the hole is sT<< o Ea, LE the second prize winning suggestion. BABE GG:

PIECE Of Third Prize. $30.00 -was won by Frederick C. Jones, of Woollahra, N. S. Wales. He takes an ordinary round bottle, mounts it on the end of a stick nailed to a box, and then greases the bottle well. A piece of cheese or other bait is then fastened to the bottle by means of wire. A runway is then fitted to the box and a pail of water placed under the A greased bottle suspended over a pail of bottle as shown. The rats in attempting to water and fitted bait, as illustrated above get at the bait lose their footing on the bottle A self-setting rat trap, the construction of with won won the third prize. and fall into the 'water to drown. which is clearly shown, seventh prize.

www.americanradiohistory.com 1108 Science and Invention for April, 1926

MODEL DEPARTMENT TS

Win a Silver Trophy Cup Take up "Model Making" as a Hobby. It is Interesting, Instructing and Profitable. Submit Your Results to Us and Compete for the Handsome

Engraved Cup Illustrated Below .

THE Model Department is here at suffice. However, your model must be sub- last ! Due to popular request, we have mitted and from it and from the sketches decided to incorporate a Model De- Rules for Model Contest that you send, our artist will make up draw- partment in this magazine and as a ings that can easily be followed by anyone. 1. A handsome silver loving cup engraved further inducement to our readers to build with your name, will be awarded as the So, the work that you do, will benefit the models and to submit them for publication, prize for the best model submitted during other readers of SCIENCE AND INVENTION as we are offering a prize of a handsome silver the month. The decision of the judges will well, providing that your design is published. loving cup for the best model submitted each be final and will be based upon, A- novelty By hard and turning out the best of construction; B- workmanship; C-oper- working ating efficiency of the model as related to the efficiency of the device which the model sim- ulates, 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- Qien@t and . cording to the subject that is being handled. invention 3. Models may be made of any available material, preferably something that is cheap and easily obtainable. Models made of Model Tro h matches should not be submitted to this de- partment but should go to our Matchcraft =_ First Prize._ Contest Editor. aZ07x2C%P.CL k 4. Models must be submitted in all cases. Good photographs are also highly desirable and where the maker does not desire the model to be taken apart, legible drawings with all dimensions covering parts that are not accessible must be submitted. 5. Models should be securely crated and protected against damage in shipment and sent to us by parcel post, express or freight, prepaid. Models will be returned when re- quested.

6. Models for entry in any particular con- test must reach this office on or before the 25th of the third month preceding date of publication. For instance, models for the June contest must reach us on or before the 25th of March.

7. Address all entries to Editor Model De- partment, c/o Science and Invention Mag- azine, 53 Park Plate, New York City. This illustration shows in detail the appearance .1=,mm mmmmmrIMUmnrnimrmmrrrrm,mmmmm,rr1rmrmrmlmmmmmmñ will be engraved on each cup Here is shown a photographic reproduction of of the shield that the cup that will be awarded each month for awarded. The winner's name will be engraved the best model submitted. Isn't it worth work- in the blank space shown. ing for? It is I7%" high and weighs five pounds. possible model, you will accomplish many month. Once you have won this cup, it is things. First, you will be instructing your- yours to keep. There is no necessity for you self in some certain lines of endeavor. Sec-. to win it two or three times in succession ondly, you will be acquiring a knowledge of as is often the case in contests where cups tools and how to handle them to the best are awarded as prizes. - advantage. Third, you may be helping others On the two following pages of this issue to enter this most fascinating of all pastimes. you will find complete details covering the Fourth, and last but by no means least, you construction of one of the finest working will be paving the way for competition in a models of a steam engine and boiler we contest that may net you a handsome silver have seen in some time. This is an ex- trophy cup as a reward for your labors. ample of the kind of work that we want to In the center column of this page, you will encourage among our readers. The building find complete rules for entering our Model of models is a hobby that is wide spread and Contest. Study them carefully and follow you will find followers of it in every class each and every one of them. If you abide by and creed throughout the world. You need the rules, your entry can be handled quicker not have an elaborate machine shop in order when it reaches this office and if it is award- to compete in our contest as some excellent ed the prize, we can present it to our readers models have been made with the very sim in the best possible form. Do not forget plest of tools. the main thing and that is that the model After you have viewed the drawings ac- The comparative itself must be submitted. Remember the companying the following article, do not pre- size of this beautiful trophy Model Engineers of today are the fullfledged sume have to make similar drawings cup can be seen in the above photograph. This that you is a prize that you will be only too proud to engineers of tomorrow. Model building is the in order to enter your model. On the con- show to your friends as proof of your ability as stepping stone to engineering if you elect to trary, the simplest of detailed sketches will a model maker. make it worth your study and thought.

www.americanradiohistory.com 1109 Science and Invention for April,1926 Model Boiler Details of The Construction of the Boiler For the Complete Stationary Steam Engine. Illustrated in the March Issue. This Is the Second and Final Installment water & INVENTION fountain or for a small fire hose. In the boiler. In this way either hot or cold IN the last issue of SCIENCE and the boiler of Magazine we showed the complete details front end of the boiler a valve will be noticed, can be supplied at will can be automatically filled up while of a model steam engine developing 1 /30th the lever of which when turned up permits course of a horsepower with steam at a pressure of the water from the pump to be injected dir- the engine is running. only fifteen pounds per square inch. The ectly into the boiler. When the lever is Throughout the model, leather, rubber or remaining details for the construction of the turned forward water from the boiler flows cardboard packing is used, except in the boiler are listed on this and the following out, thus partly draining the boiler, and when cylinder valve and pump. Here the pieces page. The diagrams are explanatory in the lever is turned down, water from the are made to fit accurately and a little oil pre- themselves and every detail can be seen in pump passes out of the pet cock near the vents the escape of steam, and water in the in this issue as well as those case of the pump. the illustrations ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? in the previous issue. The pipe connecting Several methods of operating the boiler with the boiler to the cylinder of the steam ? are shown on the following page and in ad- engine should preferably run along the side dition to those outlined, there are other sys- of the boiler and as near to the fire box as tems .which could be employed but which possible, as the photograph in the previous were not here illustrated because the most issue showed. In this way additional heat is Whot efficient forms and the neatest looking jobs made to act upon the steam and a sort of a are explained. For instance, an immersion super -heated effect is produced. A small oil ? ? heater can be inserted into the boiler and the cup is preferably inserted into this pipe line ? ? leads can be taken out from the top of the so that the moving parts of the valve can be ? ? boiler, but it is obvious that if this type of lubricated by merely permitting the oil to ? ? heater is used, the presence of the leads would pass down into the pipe line. It may also be ? ? be objectionable, and in addition it would be seen in the photograph published in the ? ? quite impossible to effect a replacement in March issue that the pipe line slants down- ? ? the event that the immersion heater was ward toward the cylinder of the engine. In i ? burned out. this way pockets that catch condensed water ? ? A slightly better form of using electricity ? Will win the first Science and ? vapor are eliminated. The pump for the for heating would be to employ a standard steam engine is unique in construction and ? Invention Model Trophy Cup ? ? See next issue. ? heating coil and place this directly under the not only serves the purpose of pumping cold boiler. An six hundred watt unit water into the boiler, but may be used to ? ? ordinary supply water pressure for a small table ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? S ? ? (Continued on pave 1142)

BOILER SHELL. BRASS OR SAFETY, COPPER TUBE. 311/2" DIAMETER VALVE X 87/8" LONG. , m ¡r t za 7! I I ® I I. BOILER THROTTLE FILLING CAP ï,..:..: ":.,

TO

ENGINE . CYLINDER

GLASS TUBE 1/8' DIAMETER X 27/g" LONG

TO PUM ON ENGI E

u u

I I I I{íIlI I M

DRILL FOUR DRILL FOUR HOLES FOR N. RIVET HOLES STRAP CROSS FOR MOUNTING SCREWS 88 SECTION PART NQ. 2E ."..- 48 ïIG ' ój 7' I 6 0E) 'r16' 8 2r--4- 16 8 I EDGES 12 TURNED I T8 DRlO- 6 HOLES ON UP Sig DIAMETER CIRCLE. DRILL 4 HOLES DRILL FOUR HOLES 34 DIA. FOR RIVETS. -MAKE TWO- HOLES (TWO EQUALLY SPACED. 2 HOLES ON EACH SIDE) EACH SIDE. SHEET IRON FOR RIVETS, 3" USED TO a FASTEN THIS 4 -FIRE SOLDER 12' PART TO 8 I" BOX 'PART Ng. 2A 24 ONE I MAKE SIDES X.Y.Z SHEET IRON MIS - MAKE ONE - 18 TURNED UNDER SHEET IRON THUS, 1/ DRILL FOUR HOLES FOR MOUNTING SCREWS

will be The above set of diagrams further illustrate the construction of the steam en- details of this model boiler are shown on the following page. it gine and give specifically the construction design of the model boiler. Further noted that the numbers correspond with those on the detail drawings.

www.americanradiohistory.com 1110 Science and Invention for April, 1926 Stationary Steam Engine Details Unique Methods of Firing the Boiler

DRILL 6 HOLES 32 HINGES N4.2.56 SCREW ON 5/8 DIA. LATCH CIRCLE. HOLES m 3 /I6 DIA. _}r4liiiilul M EQUALLY 112.S.' IPuiiuigl SPACED DRILL HOLE pppp ÑI - r, DRILL FOR ALCOHOL p1 f 4 HOLES DRILL CENTER OVERFLOW ` f IIInIII Illllhlll'11111 IIhimNUP FOR HOLE FOR RIVET G RIVETS PIPE 14 ZG 26 0-- MAKE FOUR - -MAKE SHEET BRASS ONE-' 316 co-MAKE ONE - SHEET METAL /8 346 SHEET BRASS MIe N2.6-32 TAP, DRILL TWO HOLES -12D w1O -IN / FOR SCREWS \\ \ 16 e SAFETY I te:_ 1 SOLDER VALVE \ 1 ONE 11R:\ z 5' '4-24 19' -MAKE - 16 r= ,..: 32 THREAD' 32 BRASS 3' 13' 32 16 WOOD OR FIBER -MAKE TWO- CUT TO FIT ZH BOILER STRIP BRASS -MAKE ONE- - - MAKE ONE * -24 TAP -' - - LEAD Y SHEET BRASS $ DEEP ò [.- DRILL 29' II N2.10-321032THD 8 FOR '- 32 TUBE 7. N2.10-32 pg i MI DRILL- 5' 16 THREAD. 16 32 o \ 1ÌI 1' ;I . NW D. 32 +ch N2.15-32TAP 24THDS ) SAME HANDLE PER 3' \ AS PART N2.5 R.H. U.S.F. $ DIA. N210 -32 DP LL FOR 5_ THREAD Ì6 TUBE PP '' OòOaa...... fo SOLDER N.O Ì6 46 DR. -MAKE ONE - s

' NQ. 10-32 TO -MANOMETER MAKE ONE DRILL 6 HOLES '32 DIA. ALCOHOL -. :w METHODS OF OVERFLOW PIDE FIRING LER 8 Bo' GAS LAMPLAM P ;.µ a ® -MAKE ONE - MAKE ONE FILLING BRASS BRASS PRIMING -- IMMERSED PLATE WICK 16 CAP PLATE WATER HEATER -

A LITTLE SALT MAY BE ADDED TO THIS WATER. AFTER FIRST TIME WATER ONLY IS ADDED.

-BLOW TORCH OR BUNSEN SOFT RUBBER R- MAY BE LAMP, BURNER TO 110V. LINE ELECTRIC IRON OR BRASS OR HEATING COIL COPPER TUBING ABOUT 5/32 DIA. The above print completes the detail diagrams for the model stationary when the water in the boiler gets low, steam engine developing current no longer passes across the one-thirtieth of a horsepower with only fifteen plates, and consequently there is no danger of ever overheating pounds of steam pressure in the the boiler boiler. This model may be made to drive a In the method using the blow torch, heat and high pressure steam are small dynamo or may be made to operate a small model pumping station or rapidly obtained. in fact As a matter of fact in this particular form of firing, the it can be employed wherever one desires to use a miniature steam model can be started, a minute engine to or so after the torch has been ignited. Blue- operate a display of any nature. At the bottom of this page two prints for the complete construction of this model optional methods of firing steam engine may be had the boiler are illustrated. In the electrical system from the Blueprint Division of the Model Department.

www.americanradiohistory.com Science and Invention for April, 1926 Everyday Chemistry By RAYMOND B. WAILES

i,, ANEW TEST FOR N'TURAL2 i . % ,, PEARLS 3 - i ``a. \ ATE i!JW1 G, SHOUT j cit:i PIPES BE _ KEEP THE NAPTUNE -% ; ' -_"` % % 'El COVERED WITH ` _: BROMIDE ' c = "" . ,-THERMOS BOTTLE _,,y,. / _ :1 ..\ CINDERSQRASHEb` 1r SWEET AND CLEAN r`_ , ® .'- ATURPEARLS 3 - ? ; PERMANGANATE ée (F pg 1 .3 WITH = ' ;mi z T(1=: ; OF POTASH - - METHYL-IODIDE --..2ï 1 ART I F I CI AL PEARLS (SINK) b,,. }, ;'v' contain various forms of sulp ur w is If suspected pearls are placed in a methyl iodide Cinders If a pinch of potassium permanganate crystals probably form sulphuric acid and cause a and a few ounces solution and napthaline bromide added, the na- are placed in a thermos bottle \,corrosion of the iron pipes. Do not use thoroughly tural pearls will float, whereas cultivated ones rapid of water are added, the mixture will cinders for the purpose shown above. clean the interior of the bottle. will fall to the bottom.

COTTON PLANT

WHAT EXPLOSIVE 01rABOUT USING THE WHY DID SHAVING STICKS ODORIFEROUS PRINCIPLE "OF I S GOOD FOR. GET TWBLUES''? BURNS ? THE COTTON PLANT TO TRAP THE BOLL WEEVIL? Nickeled brass cases formerly used for shaving Picric acid, used as an explosive and as a yel- Boll weevils are attracted to the cotton plant of the sticks and the alkaline soap combined with the low dye is a very good application for burns by the trimethylene, an odoriferous part with water, it plant. This substance could be used as a lure copper and formed blue copper compounds. and scalds. Made into solution aluminum cases are employed. is applied with bandages. for boll weevil traps in the fields. Now,

GAS METER

o/'i,w/ 7, fr r Ars %%.I G V k/'////%/ ONE -FIFTH OF YOUR GAS BILL HAS YOUR RADIATOR GOES TO THE OIL INDUSTRY'S ALCOHOL BEEN TAMPERED WITH? CASH DRAWER. WHY ? same acid into a Because a petroleum distillate, gas oil, is used Both materials contain the -lactic To test this, pour a little of the alcohol medicinal value of saurkraut and the and ignite it. If much in making the majority of this country's il- acid. The flat tin pan as above liquid in which it is cooked is beginning to come remains, the alcohol has been luminating gas. Therefore, you have to pay for liquid residue is produced. into its own. diluted maliciously with water. the oil from which your gas

WHY DO THE LABELS ON 11 DOES A CHEMIST HAVE DO THAT SOME BOTTLES OF TO BE CAREFUL OFWHAT I 1 THE CE SOFTBAT I 10 Ñ WITCH HAZEL HEMIXES$AS HL IS LIKELY SPONGE IS CHEMICALLY ALMOST CONTAIN- - 73O PRODUCE THE SAME AS "DEEP FREE ANEXH SAND? FROM PLOSION CONTACT, WITH IR

WITCH HA rt. is not much like- of tannic Under usual conditions, there sand are chemically Because witch hazel contains a trace When handling un- In part, bath sponges and of iron forms iron lihood of an explosion. They are both composed partially of acid, which in the presence materials, it is wise however to ex- the same. which are, in reality, the base of many familiar silica although they are entirely different in tannates ercise ordinary safety precautions. formation. writing inks.

www.americanradiohistory.com 1112 Science and Invention for fl pril, 1926

EXPER(MEtTAL CJEMSTRY w. Recovering Silver From Hypo ALARGE number of ama- or lowered into the acid as de- teur photographers develop sired. and fix their own negatives When the and prints. In the fixing solution basket is lowered into the acid, the gas is of both negatives and prints quite generated and is passed into the bottle - a little is con silver dissolved which taining the old hypo solution. is almost invariably thrown away. This bottle is The old hypo stoppered with a solutions are cork having two holes, one con- poured into a quart or gallon jug taining the tube which leads the and retained until the bottle is gas into the solution, and one practically full. The amount of which leads out of the bottle and silver obtained from even a quart into a little glass containing a of old exhausted fixing baths will dilute solution of a caustic such as surprise the photographer and the lye or in simpler fashion out of resulting silver, nitrate can be used the window. This last tumbler for quite a number of photograph - absorbs the gas as it passes out ical experiments, or can be dis- and prevents the odor of the posed of in other ways. That it hydrogen sulphide generated from does pay to save this solution has entering the room. been strikingly illustrated in the After running about an hour moving picture industry, where the flask containing the- hypo enterprising men went out and will smell of the hydrogen. A great quantity collected old hypo baths in order of silver is lost by photographers, who throw their hypo Then filter the solution, which is to extract the silver from them. solutions away after use. It can be readily recovered and saved by precipita- now black, paper ; tion with sulphuretted hydrogen as through take A fortune has been made by shown above. the paper with its black mud and this means and now the old hypo place it in a beaker containing a baths are not given away, but sold at a good no odor is connected with the process. strong solution of nitric acid. Boil the paper profit. The hydrogen sulphide is generated with and the black silver sulphide until the en- The easiest method to extract the silver iron sulphide acted on by dilute sulphuric tire mass has a straw color. Then filter from hypo by the home worker is to pre- acid in a bottle which is stoppered with a again to remove the fibres of the filter paper cipitate it as silver sulphide by means of rubber stopper having three holes. One and evaporate. This resulting silver nitrate hydrogen sulphide gas which can readily be hole carries a safety tube, another a gas is collected, and when a small bottleful has produced in a special flask; the disagreeable outlet tube, and the third carries a solid glass been obtained, it can be purified by frac- odor given off by this gas can be "caught" rod holding a leaden basket which contains tional crystallization and you will have a nice in a dilute solution of caustic soda so that the iron sulphide which may be raised from quantity of silver nitrate. Extemporized Blast Lamp Test Tube Breakages The illustration shows an extemporized Bunsen burner, perhaps half an inch above Referring to the "right way" as illustrated, blow-torch for use in the laboratory, but it it and a little to one side. The clamp which it will be seen that the tube is heated near should not be used except by a competent holds the tube will steady the flask. To se- the surface of the liquid or well above the cure pure gas, vaporized alcohol free from bottom of the tube. Any steam formed here liquid, a trap of simple construction is used will easily bubble up through the small immediately above the cork; the illustration amount of liquid overlying it and escape into shows its simple construction. Now on heating the alcohol with the bur- ner placed as shown it soon begins to boil and gives off vapor at a slight pressure to start CLAMP -.- TEST TUBES - with, which may become considerable, for a few inches is high pressure in a gas lamp.

The blast from the end of the tube deflects -WRONG WAY the flame and by shifting the burner about various jets can be readily produced. Enough RIGHT BUNSEN of the heat is supposed to rise against the WAY - flask to maintain its temperature high enough BURNER to volatilize the alcohol. It is the reverse of the ordinary blast lamp, as the fuel or part of it produces the jet. t The right and wrong way of boiling a solu- No doubt, the experimenter has often been tion in a test tube. Even if you do it the alarmed at the very large number of test right way do not turn up your gas flame too tubes which have been broken in his labora- high. tory. An inquiry will reveal that'a large proportion of them are broken when being the air of the test tube, the downward pres- used to heat a liquid or substance over the sure being very slight and no breakage Bunsen burner. occurs. But even at this do not use too large Referring to the "wrong way" in the two a flame. Now, as the liquid becomes heated sketches herewith, it will be seen that the to boiling, the tube should be raised in the A simple blow-torch where the fuel or rather extreme closed end of the test tube is being flame so that the central portion of the liquid part of it supplies the blast. It should only heated. This will cause steam bubbles to is heated and then by another slight elevation be used by the practised chemist. form, which will push the overlying liquid the lower contents are heated. It will be in the direction of the arrows, to L and also found by employing this method of heating, chemist, one who is sure of himself. The to B. It will be seen that B is the end of with gentle shaking or swirling of the tube illustration tells the story. A Pyrex flask, the tube and the bubbles bring the unpro- and its contents with a rotating motion of the preferably a round bottom one, is placed on tected glass into the flame, heat becomes so hand, test tubes will rarely become broken a sand bath over a Bunsen burner. From its great that the end of the tube by the heat over the flame. neck a glass tube leads down to the top of and the return of the water is broken. -By Raymond B. Wailes.

www.americanradiohistory.com .a ao ff 'uoi.quigseM mats/ 'mon Sind S-ir uo a'vár.ftaP9l,. 'uamp 'ff pamqain ']sonnai 0.".i vol1snuo)n; io jr uua3 pue la'SOOff sna 1 mó6 6lPsls eoiePe óaouimilead p'paillai -an7 101 ealnaas.iduload 1113 pun uolloaload oil s,l,nW epe,y :Imam Science and Inven -aadraoa a-peaeyslse8 ivaiirst (panuyuoa) sóauJoflE experiment the entire gel c.c. of the glacial acetic acid to a volume of Easy Experime .d a red or pink color by the one hundred c.c. Then add fifteen c.c. of G he indicator. This, however, is a lead acetate solution, made by dissolving L9iL .olored gel but only one made so three grams of the dry salt in that volume By EARLE R. CA ,l means. A gel may be made of water. The mixed solutions are then .test - NE of the mo<. der, salts in which the entire body poured into test -tubes to set. Each O full. the of modern therm .., . =lu of the gel is of a delicate blue color. An tube should be about half When especially interesting for the ex- essential point in making this gel is that the gel has set the remainder of each test -tube The field is made by dissolving perimenter since many of the experiments in solutions must be kept at a low temperature, is filled with a solution chemistry are exceptionally striking, preferably, under 15° C. (59° F.) which is a thirty grams of potassium iodide in one colloid c.c. The tubes are then and are generally capable of being carried out little below ordinary room temperature. A hundred of water. and apparatus. The simple ice cooling bath will help in carying observed from time to time. Various fern- with simple chemicals -yellow most unusual experiments are those involving out this detail. Three c.c. of a saturated like forms appear and the golden in the light. The proportions the so- called gels. These substance, in a sense, solution of copper sulphate are mixed with scales sparkle of the colloid solutions. Col- forty -seven c.c. of a saturated solution of of the reagents can be varied within certain are the opposite the phenomena can loid solutions consist of extremely finely- copper acetate. To this mixture are then limits and variations of divided solid matter suspended in a liquid, added with constant stirring four c.c. of be thus observed. while the gel consists of finely -divided liquid ammonia solution, made by diluting the or- distributed through a solid. In carrying out dinary strong concentrated laboratory reagent the experiments below, little difficulty will with an equal volume of water. The mixture A Home -Made Fire Extin- be experienced if the directions are carefully sets to a light blue gel which will not break guisher for the Laboratory down from the gel form for nearly a week, if the temperature is kept low. A brown By FRANK H. MOORE gel from manganese salts may be made by 3.0 I.II tool ,IoiIIi.IIIIYIIIIII/. ` = adding three drops of glycerine to twenty GLASS TUBE c.c. of a s:x per cent. solution of potassium permanganate. This gel rapidly sets but as RUBBER a rule only remains in the gel form several TUBING hours. EXPERIMENT III TEST TUBE MUS ICAL BANDED GELS (LIESEGANG'S RINGS) GELS WITH H2504 A most peculiar phenomena sometimes occurs when ordinary chemical precipitates are formed in gels. Instead of forming in an even mass throughout the solution, as when a precipitate is formed in a water solu- -B TABLE tion in a beaker or test tube, the precipitate in the gel forms in bands, leaving clear spaces between them. These alternate bands are called Liesegang's rings after their dis- coverer. A simple way of showing them with ordinary materials is to first make up GLASS FIG. a gel by dissolving two grams of ordinary NOZZLE a gelatine in sixty c.c. of boiling water at the Interesting experiments with colloids. Fig. 1 same time adding one -twentieth of a gram shows overlying gels which may be given dif- (one pea -size crystal) of potassium bichro- SOLUTION OF 2 a gel whose recep- ferent colors. Fig. is mate. The hot solution is poured into a small SODA IN WATER tacle gives a musical sound when struck against a table. beaker and allowed to set. When the gel has set it is removed from the beaker and placed A chemical fire extinguisher, based on the made by dissolving twelve followed. The gels as a class are usually in a solution action of sulphuric acid on sodium bicarbon- grams of silver in one hundred and acid is in the test tube. sensitive and unstable so that variations in nitrate ate. The contained often result in failure. fifty c.c. of water. The cooling and plac- their preparations an This very fact, however, makes the field in- ing in the solution had best be done in are unable to gel should be allowed to re- AFIRE is a thing that we teresting for the real experimenter for lots ice box. The a notion to break main in the silver solution two days. When. foretell when one takes of room is left for an enormous amount of out. Of course, if care is exercised in the experimenting in this field. this has been done the gel is removed with a How- pair of forceps rinsed with water and sliced use of it there is little or no danger. EXPERIMENT I thru the middle with a sharp knife. The ever, a fire extinguisher is an invaluable home, and will repay- its A MUSICAL OR RINGING GEL bands of the precipitated silver chromate can asset to have in the then be readily seen. owner many time, in the feeling of security This particular gel is very readily pre- which it imparts, particularly the experi- pared. Commercial water glass is diluted EXPERIMENT IV. menter who has a home laboratory and does with about an equal volume of water and CRYSTALS GROWING IN GELS considerable chemical and electrical work. into a small the solution is then poured Many substances such as gold, copper and The one here described is made after the bottle or a test tube. With constant stirring salts when slowly formed in gels take pattern of the well known "Pyrene Extin- is then added to certain concentrated sulphuric acid the form of beautiful crystals. One of the guisher." As shown in the sketch the requi- the above solution, the number of drops a wide mouthed bottle capable of of the water sites are added being equal to the volume SILVER NITRATE SOLUTION, holding at least a pint of liquid. A satur- glass solution in cubic centimeters. Some- ated solution of sodium bicarbonate (baking - times the gel forms at once and sometimes by dissolving about three for a soda), is prepared the solution will have to be set aside ounces of the "soda" in the pint of water. day or two. The more dilute the water glass has dissolved pour the mixture is When this solution, the longer it takes to set. It into the bottle. Now take a test tube long much better if several hours are needed to enough to reach almost to the top of the set the gel. The proper point is found by will glass (bottle, or so that the top of same just using different dilutions of the water clear the soda solution when it has been solution although with the ordinary product placed in it. Dilute sulphuric acid is now above dilution is satisfactory. The test PREPARED GELATINE the made (1 to 5) , and poured into the tube, tube or bottle containing the preparation or FIG: 3 leaving about one -half inch clearance of the when tapped against a wooden bench the method of produc- is fitted to give forth The illustration shows top. A one -hole rubber stopper similar surface will be found ing Liesegang's rings. Silver chromate is with a fairly large bore glass tube bent at a clear ringing or musical sound. Successful precipitated in parallel bands, seen by cut- right angles, this having . a three foot length ringing gels can also be formed with hydro- ting across the gel with a sharp knife. The of rubber tubing connected to it. Assemble chloric acid and water glass solution. the extinguisher by inserting the stopper in proper proportions can best be found by kept a long easiest ways to show this phenomena is by neck of bottle, and to use, simply invert the experiment. These gels can be in hose the fire. down or undergo the forming golden crystals of lead iodide bottle and point the at time before they break was first per- The principle of the extinguisher is this process known technically as syneresis. silica gel, an experiment that - formed by Holmes in 1917. This particular The dilute acid comes in contact with the EXPERIMENT II growth is strikingly beautiful. Dilute twenty "soda" solution, which vigorously react BLUE AND RED COLORED GELS c.c. of commercial water glass to about one chemically, causing a rapid evolution of car- forces the liquid few drops of phenolphthalein hundred c.c. and add an equal volume of bon dioxide gas which out By adding a through the tube at quite a high pressure. indicator solution to a gel of the kind de- acetic acid solution made by diluting six

www.americanradiohistory.com 1114 Science and Invention for April, 1926

Magazine Electric Soldering Iron By A. N. CAPRON THE electric sol- part 1 for the leads dering iron here from the heating described and il- WINDING SPACE CORD cir- cuit. The ' ends of lustrated will at first 1 TO PLUG leads are fastened glance seem to be the to 110 V. the clip shown at N ordinary iron, but a groove being there are several im- `.wv.r " ,rr cut o n provements litl E both parts to accom incorpor- .iff modate this clip. ated in its design. The Th e 110 volt leads ar e tubular stem of the fastened iron in such a carrying at one manner, that no end the heating ele- Je. liv e 4 ' 1"*-- wire ment emerges fro m and at the other, the wooden handle the wooden handle is DETAI L OF " " N This is easily accom- used as a magazine for plished by cutting a small stick of solder just sufficient rubber which introduced is at from the wire; the part E and secured lower part of D when with the knurled cap screwed home holds seen there also. The clip and wire leads lower end of the stick securely. The addi- of solder comes in tion of contact the knurled with the cen- cap, E, completes the tral portion of the cop- iron. But the enamel per tip, and when the leads could be better iron is heated a small protected by means of quantity is melted and a serving of asbestos runs out through the thread or cord and fine capillary tubes in this asbestos serving the faces of the cop - protected by winding per tip, and thereby C F tightly one layer of flows directly upon the No. 10 bare copper work. wire the end turns of It can easily be un- STD. which are to be brazed derstood that with -î PIPE together with a blow- such an iron, a larger THREAD .14-F ® pipe. amount of work can 7 ` The whole assembly E be performed in a is easily repaired and given time, as the A easily taken apart. operator does not have very complete electric soldering iron is shown above whose interesting feature is that there is a cavity or reservoir in the bit The size of solder bar to be continually which holds solder and in which the solder remains melted, coming ap- out as requir ed through a very small aperture communicating with the reservoir. recommended is about plying solder to the inch diameter or tip. All dimensions are marked on the inch hole in the base of C, this hole being wire solder if obtainable will sketches. be excellent, previously lined with a small mica tube. The this could be cut in pieces 4 to 6 inches long, The heating element consists of two layers other parts having been made, cover the one filling being sufficient for any No. 26 ordinary of nichrome wire wound with 1/32 wound portion with a layer of micanite and job. If the cap is made a very tight fit it inch space between turns, an asbestos thread try the brass tube, F, on it, if this tube fits might be necessary to drill a very small hole makes a good separator. The form, C, is too loosely wind a layer of asbestos thread in cap E to admit air, as if is given a everything air- layer of micanite with / inch lap of on the micanite to hold it in place and push tight, no solder could flow out at the tip. 25 mils micanite or the equivalent in layers the tube, F, into position tightly up to the The size of the almost capillary of thinner material, tube at the then the nichrome is collar on C. tip is given in 1 fastened the sketch as /16th inch, but to the No. 16 enamel wire. The The wrought iron pipe is next threaded this size is suitable only two holes 1/16 inch for tinsmiths. The at base of form, C, are and screwed into the lower end of form, C. regular run on soldering work will Lined with a mica tube and the copper be better wire The copper tip is placed at the other end and done with a 1 /25th inch hole. is is pulled through leaving But this 10 inches extending screwed tightly. It will be observed that an easy matter as a few blows around the outwards, the junction being on the inner the tube F is held tightly between the flanged outer end end of the former. of the capillary hole will reduce One layer is wound to ends of part, C, and tip, B. The wood handle it sufficiently for any special purpose. 1/8 inch of the end; a layer of micanite 10 is made in two pieces which are to be fasten- Such an iron mils thick is can be made for $1.25 if the put over the wire and the wind- ed together with screws or rivets and lathe work is ing is continued wash- done at home. Scrap can be to the other end (return). ers as shown. The lower part 2 is used, A piece of the bored the only part which it is absolutely nec- same wire is fastened to the with a slight taper at the lower end, so as essary to other end and pulled make out of copper, being the tip through the other 1/16 to grip the pipe, there are also 2 holes in or part A$._ Loud Speaker in Fish Head By CLYDE E. VOLKERS SEEKING something new and unique in mounted easily. The important points to the head suitable loud speaker design, the following ex- to a board by bending the remember are: to remove excess flesh from gill flaps at right angles and driving the periment may be performed successfully.: the freshly removed head of the The open mouth fish; to dust small tacks through them; to varnish the of a mounted bass head, the inside of the skull with a mixture of head the fighting grin of a muscalonge, after it has completely dried. A trial or any alum and arsenic, 1 part mounted animal head offers arsenic to 2 of or two will yield satisfactory results. opportunities for alum ; after the eyes have beep removed something new in loud to The phone rests in a slot cut in the board speakers. fill the cavities with artificial eyes of wood, on If you have no mounted fish head which the head is mounted. The card- at the clay or glass, which are made in the natural board horn is time, experiment a little and to mount thoroughly soaked in water try colors ; to prop the mouth open with a stick clamped to the phone, one (catch it first). A fish head may be and then while it is until the jaws have dried or set; to tack soft, and plastic, is pushed against the inner

www.americanradiohistory.com 1115 Science and Invention for Apri1,1926 wrap a sheet of paper ing posts the needle will show the polarity walls of the head, so as to be invisible. A simplest way is to constructor hold the tightly around the tumbler, and to spring a or direction of the current. The wad of crumpled newspaper will must wind the magnets so that opposite poles when it will retain rubber band around it, using the rubber horn in place until dry, pencil will face each other when a current passes. position. band for a guide to draw a horizontal its removing the paper it can be cut line. On MINIATURE STORAGE BATTERY LOUD SPEAKER accurately to this line, and parallel thereto it is a second cut; No. 14 gauge is coiled around UNIT or rather concentric with A lead wire this gives a band of paper corresponding to a needle. A piece of celluloid is softened by TO SET,. area of two circles of large radius. Putting hot water and wrapped very neatly around water into the tumbler and floating a needle upon it, the magnetized needle will point, of \¢edle Gelluloid course, to the magnetic north. The tumbler coaktfd is now turned to bring the zero of the scale l HORN FITTING Ilre opposite to the point of the needle. On lay- SNUGLY INTO ing a wire across the top of the tumbler kead wire MOUTH parallel to the needle a slight current through the wire will affect the needle, causing it to #14 SRG. to HEAD turn to right or left, according the direc- FASTEN is WAD OF tion of thecurrent. As the needle fric- 4- TO BOARD regards its support, except for the PAPER WILL tionless as viscosity of the water, which is very slight, HOLD HORN IN POSITION. we have a most delicate current tester made UNTIL DRY from the simplest possible appliances. A fish's head nicely mounted on a board serves as the horn, ostensibly at least, of a loud speaker. CURRENT DIRECTION INDICATOR A magnetic polarity indicator is illustrated The cord should be led to the set in as in- here. This indicates directly the direction .F.1_91-1-32?. 2 3 conspicuous a manner as possible, the of a current or its polarity. The terminals F mounted head being hung from the wall. An oddly constructed B battery whose cells are the cavern- BINIDING POSTS glass test tubes or specimen tubes, and which With the signals comingfrom can be made to give a high voltage by packing ous mouth of the trophy, the program may COMPASS a number of the tubes snugly in a box. truly be called -"The voice of the Great Lakes." the leaden wire. A second leaden wire is wound around the celluloid, this binding AN EXPERIMENT IN THE ELEC- everything fast. The needle is then to be TRO- MAGNETIC EFFECTS OF it be that here is the 00 removed and will seen A CURRENT e'ement for a storage battery cell ready for A common sewing needle is magnetized by IIiÌÌlliiiliiIIIIIIIII the solution. The elements are placed in a stroking with a magnet or otherwise and is test tube or better yet what is known as a then thrust through a cork as shown so that specimen tube, which is of heavier glass and it will float in water. In this case a tumbler acid added. The two terminals are then is used to hold the water. Around the connected to the charging circuit, charged tumbler is pasted a scale marked off upon a and discharged over and over again so as strip of paper. A certain amount of nice- ELECT.RO MAGNETS to form them on the Planté system. The ness will be required in putting the scale A current direction indicator. This instrument small box can be packed with a large number upon the sloping side of the vessel. The is of quite novel construction, and is a very deli- of these tubes so as to give a sufficient cate indicator of current direction as the mag- WIRE nets act so intensely on the needle. voltage for a B battery. are connected to the binding posts, and the COLLOID AUDION magnetized needle shows instantly the polar- ANODE OR PLATE so CORK ity. The instrument is best placed that the magnetized needle will lie in the magnetic meridian. The magnet windings must be NEEDLE such as to give the direction of current, ac- cording to whether the needle points in one direction or the other. There is no half -way SCALE variation. The active portion includes a small com- pass; there are two electromagnets, facing GLASS OF each other and two binding posts. The pivot and magnet cores lie 4- WATER of the magnetic needle CATHODE OR COLLOIDAL in one line. The needle of the compass must FILAMENT SOLUTION be marked with a + on the proper end to The above shows the idea of the colloid audion. indicate the north pole and with - on the The colloid rectifier is practical, but so far no end. is inexpensive in construction, success has been had with the audion and the A rough and ready way of rapidly construct- other It diagram is given as a suggestion for ing an extremely delicate polarity tester and an and when the poles of the battery, which is above apparatus also adapted for demonstrations. to be tested are connected with the bind- further experimentation. The Spencer Thermostat Disc closing of a circuit that the danger of an arc which is sometimes applied to this device. is eliminated, and not only this, but it pro- Two views are given of the thermostatic duces so great a pressure that a very per- disc used in the Spencer flatiron, for prevent- A fect contact results. ing it from attaining too high a temperature. Referring to the illustrations which we The disc snaps back and forth like the bottom or face view of the disc of a machinists' oil can, opening and closing give here, front the circuit. is shown, with its three contacts spaced sym- metrically around its periphery. As the disc closes the circuit, it is supposed to make three contacts and will do so infallibly if in good condition and in adjustment. Means are provided of course for insuring this re- sult. In the elevation and partial section the above the base plate, disc will be seen a little Front view and elevation partly in section of it is which snaps back and described the and this disc the Spencer disc thermostat carried on its IN Sept. The Experimenter forth, and from this action with its clicking base. The three contacts are in parallel giving invention, a thermostat which op- Spencer sound is derived a trade name, Klixon, very low resistance. erates to produce so sudden an opening and

www.americanradiohistory.com 1116 Science and Invention for April, 1926

ás-- 1-ir Y i II JUNIOR ELECTR(C(AN IÍIÍII

High Speed Soldering Outfit too large and clumsy -a brass or copper By J. G. VILLEPIGUE spring about three inches long and a short piece of tape. The wire is wound on the bolt Here's the trouble saver supreme, for the until it is covered with about five layers. experimenter. You don't have to fool with One end goes to the battery and the other solder and acid, or watch the hot end of the end is curled around under the end of the iron with this outfit. spring opposite the end that is tapped to the Just get a board about 1 "x2 "x8" (an inch magnet. This end of the spring is connect- or so either way won't ruin the works), then ed to the battery, and represents the switch. , a ten cent clamp with which to fasten it to When one wants the -circuit to be closed the bench. Take a flexible piece of wire, making the electricity flow through the mag- (No. 18 or bell wire) and fasten the can of net, this spring is pressed and it touches the paste to the upright at about table height. curled piece of wire, thus closing the circuit. Next a (green) glass telegraph line insulator, The cells and magnet are placed in the box like those used on telephone poles, is to be where they are completely out of sight. One's fastened to the top of the upright with a hand is put inside and moves the magnet piece of the bell wire. about under the chain while pressing and Now pick up those little drops of solder releasing the switch alternately. The chain that fell off the iron when you wired that follows the magnet. With some practice one last radio set, and put them in the insulator. learns when to press the switch and when to The iron can be left in this holder without release it and many funny faces can be made. any danger of starting a fire, and being It is wise to make several of the part -profiles shielded from air currents, it will take less Another time to get arrangement for an electric soldering hot. When using it, touch it to iron. A hook -switch automatically cuts off QRAWING ON CARDBOARD the current when the iron is lying upon it. STEEL CHAIN 3"4- CARRIAGE BOLT 1 BARED end of the lower spring switch. A spring WIRE draws the bar up so as to close the circuit when the iron is removed as it must be when SOLDERING in use. NO. 18 SOCKET D.C.C. IRON If not in use the iron is to be hinged upon WIRE the switch -bar drawing it down and breaking UPRIGHT the contact and opening the circuit even if the main switch seen in the upper part of the box is closed. MAGNET TO. BATTERY INSULATOR SOLDERING PASTE An iron chain is made to form all sorts of Damping a Galvanometer queer profiles by the action of a concealed In a laboratory in which many galvano- magnet moved by the performer. meter deflections had to be read in rapid suc- cession, a novel method was used to bring so they can be changed -old maids, fat men, the underdamped and overdamped galvano- bald men, scowling men, bobbed headed .1-CLAMP meters back to zero. A Faraday's disk was girls, crying babies, are a few possibilities. built and placed across the galvanometer ter- One caution -practice considerably before minals and was left in open circuit. After exhibiting your skill before your friends the deflection was read, the disk was put and you will have more fun. The faces A telegraph line insulator is used to hold the into the circuit and by a slight rotation the will be made quicker and will be funnier. electric soldering iron along with some bits of solder and some soldering paste. galvanometer is brought to zero. Another point to be remembered is to use The Faraday's disk consists of a copper a chain of soft iron or if of steel to draw disk mounted on an axis so that it rotates the temper. An extemporized chain can be the soldering paste and put back in holder. between the poles of a horse -shoe magnet. made out of paper clips springing them to- Some of the drops of solder will melt on to The edge of the disk dips into a mercury gether. it and the iron is ready to go. If you are trough. Rotating the disk sets up an in- afraid of the hot iron cracking the glass, duced voltage and by closing the circuit, a put a plug of pumice stone hollowed out for small current is obtained. Simple Battery Charger the point of the iron inside the insulator. By Reporter 22813. The only caution to go with this outfit is A 10 -volt bell transformer is connected to beware of poles carrying high tension to a supply line (AC) and one of the wires when getting your glass insulator, if The Invisible Cartoonist leads is connected to a buzzer which is also you want to get it that way. connected to a rheostat through an ammeter By ARTHUR FLINNER to the battery. The other end of the trans- Drawing with electricity, that's what this former is connected to the opposite end of Switch Mounting for Electric is. A box of old boards is made large enough the electro- magnet and the vibrator. The to hold two dry cells and with plenty of current is then taken from a contact on a Soldering Iron room for one's hand to travel about inside. set screw to the vibrator and is then sent The size depends on the kind of boards used. to the storage battery. We have heard of soldering irons left upon If D.C. current alone is available, the the bench There is no top, but in one side a hole is cut with current turned on overnight. large enough for one's hand to enter easily. preceding arrangement will not work. For Not only does this involve a waste of elec- On a piece thick this purpose a simpler charger can be con- tric power of paper or cardboard but there is a certain element of draw part of a profile of a head as shown structed. danger in it, as the iron may get so hot as but leave nose, Connect battery to of the 110 -volt to off the mouth, and chin. A one cause a fire or perhaps only a charring steel chain is laid to form these and is cut lines. The other line is connected to ten 60- of the bench. off at what seems to be the proper length. watt lamps in multiple to the battery. The illustration shows a switch mounting Then ends are put through holes in the To determine the polarity, force the leads suggested by the telephone switch. The il- paper and several drops of glue are dropped going to the battery into a potato. Around lustration is self -explanatory. There is a on them from the other one lead line side to hold them. the potato will become pinkish. switch and when this is open no current A screw in each corner of the top keeps this This wire is connected to the positive end passes. - But when closed current will pass from slipping about. of the battery. The leads to the battery through the -soldering iron, connected as An electromagnet is made of a bolt, some must not be more than three feet long. shown, when it is removed from the hooked wire -nearly any size will do just so it isn't Contributed by Wilfrid Thelen.

www.americanradiohistory.com 1117 Science and Invention for April, 1926 changes before your very eyes into a like- of the figure on the front glass. When these Picture Display Apparatus ness of your landlady -and then to some- have been adjusted, so that the original sil- unlighted, E have had occasion to speak of the thing even worse -well, you begin to won- houette remains the same, whether of lighting clock der just what was in that last drink your or lighted by either or both lamps, the fea- two separate ways ready for the faces, advertisements and the like, by lamps friend mixed you. And when the thing tures of the small profiles are placed behind transparent screens or by light reverses, and does it all over again, you exaggerating process. from lamps in front. feel like tearing the rather thick frame apart This consists of adding to the various In the apparatus we illustrate, which has features so as to alter their appearance, as been recently patented, both systems of light- ing are employed. There are two power - ,- CABINE

ORIGINAL SILHOUETTE REDUCED PROFILES LAMPS GROUND GLASS PLATE

REDUCED COPY - ORIGINAL-. Fig. 4. The picture on the glass slide from which the silhouettes are projected must, on FLASHER SOCKET account of its inclination to the screen, be re- A box provided with an incandescent bulb duced. The illustration shows this reduced within, serves as the cabinet displaying two copy and the silhouette projected from it. pictures alternately. shown by the shaded portions of Fig. 4. It ful incandescent lamps contained at the bot- must be done very carefully as each alter- tom or rear of a sheet metal casing, open ation is magnified by projection. The sil- at the front. A composite picture is to be houettes are all done in black Indian ink, or used. an opaque black paint, upon ground glass or First comes a sheet of glass, then a piece parchmentized paper. Fig. 4 shows the of translucent paper painted in thin trans- method of reducing the original profile. The parent colors. This is to be exhibited by operation is obvious. Hook it up and press reflected light or by flood lighting. Back the buttons. Fig. 3 shows what will happen. of this is a second sheet of paper on which Figs. 1 and 2. This device will enable you to there is another picture, and this is to be my eriously flash on its screen two different shown by transmitted light. A flasher is silhouettes. The display -box being very small it is difficult to see how the change is accom- Shocking Experiments BLUE plished. By CONSTANTINE TROY FLESH to see what makes it go. Well-here's what you'll find. RED The frame isn't an ordinary frame, by any manner or means. The fact is -it holds quite a bit of junk behind its deceptive front. You will find two small electric bulbs, their sockets, and two ground glass plates ar- ranged in the shallow compartment behind

THE ELECTRIC STAIRCASE Both pictures are painted on the same screen. the inside lamp Your staircase can be easily electrified by the One, shown above is seen when method illustrated above. This method will de- is dark. light the heart of any practical joker. provided to turn the lights on and off as required. D° you belong to that much loved (? ) For flood lighting the lights may be ar- class of experimenters who delight in ranged all around the frame or front of shocking their fellow creatures? Shake! the box, or may be simply distributed along I do, myself. Well, now that we have some- its upper edge. They are contained in a thing in common, I'll let you in on a few little trough to mask them from direct ob- tricks in our profession that'll make 'em sit servation. Back of all the pictures is a up and take notice. second sheet of glass. For the first one, a wooden stairway is Thus when flood lighting is used the front needed (it may run up or down), some tacks, picture is seen. When this ceases, the lights bare copper wire and the good old spark within the box are turned on, and the second coil. To fix 'er up is just as easy as laying picture being of more vivid tints, over- a carpet. String a wire back and forth powers the design of the first picture so across each step as shown and connect alter- that it is virtually invisible. nate steps to the two wires running to the coil. When you hear "Pa" coming home from work, turn on your old coil and let 'er run ! Well, the next one shows how to "juice Ip" that footpath that runs through the back garden. An insulated wire when the ground in wet will give a satisfactory shock, Fig. 3. Each of the pictures is controlled by the of two different electrical circuits from the same satisfactory at least to proprietor source. Two switches are provided. the installation and will give plenty of juice. CABLE INSULATION the harmless looking chorus beauty. Figs. WIRE 1 and 2 show the constructional details. The other picture is a silhouette painted on be seen The lamps are placed in the rear corners the reverse side of the screen and can as in only when the inside lamp lights. In this con- of the compartment, and are wired - J dition the other picture is invisible. Fig. 3, the wires, battery and buttons being SECTION has a ground glass concealed. Each lamp OF PATI+ partition between it and the front glass TO SPARK COIL . Magic Silhouette which carries the original silhouette. Each THE ELECTRIC FOOTPATH By PHILIPPE A. JUDD of these partitions has, directly in line be- One terminal of the coil is connected to an YOU have, no doubt, heard of the D. T.'s tween its lamp and the front figure, a re- insulated cable under a path, a bare portion is -maybe you've had 'em, but -when a duced copy of the front silhouette, of such exposed at the surface. The outer terminal is perfectly lovely silhouette of a Follies belle dimensions as to throw an exact duplication grounded.

www.americanradiohistory.com 1118 Science and Invention for April, 1926 THE CONSTRUCT

Cooling and Humidifying System

The author has employed the system- shown on this page for cooling and humidifying the air of his home and so obtaining comfort on the hottest of days. An old vacuum cleaner furnishes the motive power for this circu- lation system and it is mounted in a box and equipped with pipe COLD fittings as shown in the various AIR illustrations. - Dr. W. J. .;' REGISTER Charlson. /' Itt MOP ' í WICK TIGHT FITTING BOX DISCHARGE. PIPE -} ^ dili! Illlnillill!i rn

OLD VACUUM CLEANER SUCTION PIRE

At the extreme left above is shown one method of applying this system placed in a basement and the water container is located in a sma I closed and delivering the cooled humidified air through a fireplace opening. At room. The air is drawn out of this room and fresh air supplied through the extreme right is shown another system for application to houses the intake pipe and through the water container. Here the air is both equipped with registers in the floors. In any event, the apparatus is cooled and humidified and is then delivered to the home above. Utilizing Electric Fans for Power

Left: Details o: power transmit- ting device for fans having open centers. Clips 7 hold plate to fan guard. ird

Power transmitting device for fans made with brass disks at center.

UTENSIL TO SHARPEN,CLEAN AND POLISH KNIVES.

SANDSTONE SOAPSTONE FELT

UTENSIL TO WHIP '.POTATO OR 'THE WHITE OF Above: Details of handle to APPLE-PEELER 3 which various rotating imple- EGGS,CREAM ETC ments may be attached and to which power is supplied by Above: Special utensil used Above and to right: Various de- With all these utensils, the coupling parts means of an electric fan motor in place of the usual hand vices are shown here that can be are made of tubing to slip over the tines through a flexible power trans- type of beater with good used with the handle shown at of the handle illustrated. mitting shaft. results. the left, connected to fan.

www.americanradiohistory.com 1119 Science and Invention for April, 1926 Is There a Battery in Your Mouth? By CLYDE E. VOLKERS

TIE PIN (CONNECTOR) 1- AMALGAM FILLING GOLD CROWN COP- ZINC -IF-- SALIVA AND MOUTH PER JUICES AS ELECTROLYTE ELEC- TROLYTE AN ELECTRIC CELL IN ACTION (SULPHURIC AMALGAM FIL- CELL TIE PIN ACID) LING (-) Where an amalgam filling is near a (CONNECTOR) gold crown on your teeth, an electric A simple electric cell SHOCK MOUTH JUICES is illustrated directly -- current may be set up, registering on the nerves, by connecting gold and a b o v e. Connecting REGISTERS THROUGH (ELECTROLYTE) h e elements pro- amalgam together. Fuller description t THESE NERVES duces a current. below. ELECTRIC CELL IN MOUTH

We have batteries in our automobiles, batteries in our radio sets, batteries ful shock will be felt. This is because of the current of electricity set in our pocket flashlights. and so we need not be surprised to find that up by the action of the saliva upon the two dissimilar metals, which is we have one in our mouths. If a piece of wire or a pin is placed across much the same as that found in the simple electric cell illustrated at an amalgam filling and gold crown. as shown above, a distinct and pain- the left, although on a much smaller scale. Mysterious Jar of Water

GLASS PLAT E TILT JAR SLIGHTLY AND y WATER INVERT JAR WITH PLATE RUNS OUT ON TOP GAUZE

IT -- .- INVERTED JAR __ GLASS PLATE

WITHDRAW GLASS PLATE SIDEWAYS WATER WILL NOT RUN OUT

interesting effect bu one which is governed by a invert. Upon withdrawing the plate the water will not run out, but if the A very peculiar and vertical, each open- well known law of physics may be produced as illustrated above and jar is tilted, it will do so. As long as the jar is truly a piece of gauze with about 14 threads to the ing in the gauze forms the end of a column of water upon which the at the right. Stretch equilibrium is over the mouth of the jar. Fasten it in place with thread and fill the atmospheric pressure acts. W-hen the jar is tilted, the inch A. Oldroyd. jar with water as shown. Place a glass plate on top of the jar and then destroyed and the water runs out. -C. Inexpensive Photo Trays Ready made photographic trays of a large size are ex- BOTTOM OILCLOTH ceedingly expensive but home -made ones cost practically nothing. ST Fl I P5

In making home -made photo trays, a wooden box of the required size is made and then lined A pair of tongs made of strap iron in the with oilcloth, placing all shape shown above are very handy around the of the tacks around the kitchen stove. They may be used as a lid top and the outside. No lifter, poker or tongs for removing clinkers. leakage will r es ul t. -S. W. Wilt. -J. G. Pratt.

www.americanradiohistory.com 1120 Science and Invention or fl p; il, 1926 OW TO MAKE IT.

Bench Drill Uses for Erasers Cleaning Soldering Irons In the bench Circular type- T h e soldering type of drill writer erasers iron tip -needs press illustrated may be put to frequent clean at the left, A in- various uses as ing and retin. dicates two 3/q- illustrated at the fling. Make a inch by % -inch left. Wheels for small hollow in center T pipe toy wagons are SOLDERING the center of a FRICTION GEARS ANC IRON-. couplin g s ; B, DRIVES FOR TOYS; made without sandstone block two % -inch Ts; g ¡ son changes in or smooth brick it D, brass bush- constructiononstruction o f SOLDER and place a ings; E, steel / the erasers. Fric- . small quantity of shaft ; F, pulley; tion gears and solder with some G, thrust bear- various other resin therein. ing and coupling transmissions for Tin iron by rub- and H, another small mechanical bing the tip on pulley. The en- toys are easily the surface of tire press is constructed and the stone.- mounted on a w o r k well. - WHITE . C. T. Torresen. pipe flange. -L. John P. Howe. SAND STONE J. Harris. Putty Tool Trouble -Light AUTO GREASE GUN An unusual type If an automobile of candle holder grease gun is For holding an can be construct- electrical trouble SURFACE ON CAR changed so that ed from the leg is to a surface RUBBER its outlet an- light of a fowl as where the ordin- SUCTION CUP gular and flat- shown at t h e a r y magnetic tened out a s OUTLET AND right. Cut off BLADE type will n o t shown above, the SPREADING kink the foot at the body of the gun operate, the joint as shown, illustrated at the NAILS SUBSTITUTED can be filled with %q 1AA fasten it to a right can be em- By WIRE WHEN LEG putty and that á TROUBLE wooden base and IS DRY. material forced ployed. Attach LAMP allow suction cup with it to dry into cracks. - WOOD BASE f o r thirty to a short piece of R. C. Leibe. dowel. sixty days .- wooden - Hubert Slouka. C. A. Oldroyd, Rep. No. 4433. WIRES TO BATTERY Watch Fob Continuous Still Test Tube Holder POUR METAL HERE I CUT OFF An initial em- DISTILLING The pinchcock TEST TUBE blem for a watch FLASK A is normally A very satisfac- tory holder for fob can be made closed but when by building up a it is desired to test tubes can be quickly and cos- mold out of wood fill the flask, the as shown at the upper end of the ' fly made by condenseris twisting an ordi- left and pouring nary pipe cleaner molten metal in- heated slightly PiPE to the opening. and then the C.EANER into the shape shown in the il- A f ter cooling, pinchcockis take the mold opened. T h e lustration. I f desired, use a apart, remove flask will be fill- the metal and ed by the water wooden dowel as BUNSEN a handle. -C. A. smooth with a from the cooling BURNER file. Walter Oldroyd, R e p . - system. - Ray Culin. Sabin, Rep. No. No. 4433. BUNSEN BURNER 14,356. WOOD POUR METAL HERE

Disk Cutting Lathe Focusing Camera

WOOD CLAMPED 'TOOL HOLDER TO IRON WHEEL For cutting disks from various i materials such as hard rubber, bakelite or wood, the hand lathe illustrated at the left may be employed. The abrasive wheel is removed from an emery grinder and an iron fly- wheel put on the shaft in place of it. A block of wood is then clamped to the spokes of the flywheel and the material from which disks are to be cut is screwed to this block. Tools made from file tangs or ends or from nails may be employed in HARD RUBBER the manner shown. - Don Home. Place a short length of mailing tube, with a magnifying glass mounted at one end over the finder of a camera and focusing will be NAIL expedited. -L. B. Robbins.

www.americanradiohistory.com Science and Invention for llpril,1926 1121 HIBERNATION ONCE mon thinking class. I have heard hun- dreds who thought differently. MORE My room companion used to be sound Editor, SCIENCE AND INVENTION: asleep when I would come home late at In the September number of SCIENCE Baders nighf. I would roll up some newspapers AND INVENTION, I read with interest the and hit him on the head, lightly of article, "Life Suspended in Ice, " in course, but sharp enough to make hint which the question is raised, whether feel it. He would wake right up and the statements found in some text -books or say, "some dream." He would then re- regarding the fact that fishes and some late some accident where be would have other creatures may be frozen and then hit his head, or had a headache, etc., thawed out and still live may not be but always with reference to his head. correct. As I,- at one time, questioned If I hit him on the feet, arms, legs or this statement, I made lengthy experi- any other part of the body, the effect ments at different times, and while was the corresponding one, and the some of the experiments were failures as dream accident would concern the feet, to proving the statements correct, never- arms or legs as the blow was given. theless I, found that the statement was Does this not prove that dreams are in- correct when the conditions were as SCIENCE AND INVENTION desires to hear from its readers. It stantaneous? I would like to see this nature made them. solicits brought up and discussed. the com- comments of general scientific interest, and will appreciate Now, to explain: In using opinions on science subjects. The arguments pro and con will be aired FRED LANKTON, mon method of - artificial freezing, I St. Johns, Mich. distilled be- on this page. This magazine also relishes criticisms, and will present found that, as the water is in both fore freezing, it is deprived of what air them palatable and unpalatable forms. So if you have anything (Your question concerning the length therefore, to say, this is the place to say it.'- Please limit your letters to 500 it previously contained and words of time it takes to dream is very inter- the fish was dead for want of air before and address your letters to Editor-The Readers Forum, c/o esting. Most observers claim that a it was actually frozen and, of course, it Science and Invention Magazine,' 53 Park Place, New York City. dream takes but a fraction of a second, could not be brought to life being actu- and that the longest dream does not take ally dead'. (Not so in..our experiments. anyy more than ten seconds. They all They "am . taken were always the first. I read, -EDITOR.) - Again, I' tried to 'freeze water and I very hold to the theory that the dream takes place between from a stream- in- which the fish. had ; lived, sorry to say that 'I'll- miss them. I like your the totally subconscious state and the conscious state, but the artificial method of freezing is different present serial `Tarrano the Conqueror ". very and it is during the passing from the subconscious than nature, and again the fish were dead when much. It is on account of articles like 'these that to the conscious that the ideas develop and rapidly I =buy. your magazine. It is my and am thawed out. ` (So we found.- EDITOR.) Not being favorite' I pass through the mind. Here is an interesting ex- satisfied, I tried a different method. Taking a cat- always on the lookout for the next number. ample of this and it constitutes a first hand ex- a R. PEARCE, fish about ten ; inches long from a brook with J. perience which shows how quickly these ideas pass metal container holding about three gallons of Cardinal, Ont. through a man's mind. water, I placed it where the- water could freeze While attempting some high dives toward the by natural means. the atmospheric temperature was (We are glad you like our scientific fiction fall of the year when the beaches were rather about two to three degrees above zero Fahrenheit, stories, and "Dr. Hackensaw" may be back, anon, free..of people, the writer leaped off a platform the water froze solid over night. Then placing but at present he cannot write articles for a while, about -eight feet above the surface of the as he has on to twenty my fish in a room where the temperature was left Turkey and -gone India where water. In mid -air he saw- a log floating beneath about 32 degrees I let the ice with the fish slowly him. During the time that it took to strike the thaw out and when I looked at my fish several water, a vision of hitting the log with a complete hours later he was flopping vigorously trying to crushing of the skull was seen. The writer saw in aquarium, get out and when I placed -him the his own body being .. dragged. out of the water, he swam around as naturally as ever, which cer- placed into a patrol wagon and taken down to the tainly did prove- that under- certain conditions city morgue, there to be identified by his relatives. fish can be frozen up and still live. - He saw his own funeral and then saw his own Other experiments along this line were with home six months after the incident. reptiles. A common black snake, such as is found THE new scientific fic- Now you must remember that a body will fall in the Allegheny mountains,, was found frozen tion magazine, thirty -two feet in one second. Consequently the hard, as several of us out in the woods in cold AMAZING STORIES,' dive of twenty -eight feet took .not far from a sec- weather were hunting what we might find in hol- newsstands ond to complete, and during this fraction cf a logs- trees, and carefully digging it' out will be on the second, scenes which naturally require six months, low and March 10th. Here is a so as not to injure it, it was placed near a fire rapidly flashed through the mind. - so that it could thaw out gradually, and in the - magazine after your own This seems to prove that a dream takes place in course of time it came to-itself and crawled away heart. Readers of this magazine who have> -- a very short time,.'a>ld: the remarkable portion of from the fire: The c'ommón toad has been also read the scientific fiction stories for years the whole question lies in' the fact that the dream found frozen solid in the ground and after being will welcome AMAZING STORIES with took place while the subject was fully conscious. dug out and left to lie in the sun a short time, open arms. Your own experiments are very interesting, but has hopped off as lively as ever. The new magazine contains only scientific they have been made previously.- EDIToR.) There is an at- iarium located in Gates Park, fiction type stories and in the very first issue Topeka, Kansas, which contains numerous fish. there is a story, "Off on a Comet," by the mostly goldfish, which are never taken out. The immortal Jules Verne, stories by H. G. AIRPLANES IN THE NEXT WAR water is fed in a small stream continually during Wells, George Allen England, G. Peyton Editor, SCIENCE AND INVENTION: the time it is not frozen, but when winter comes, Wertenbaker, and many others from the pens gets to zero, the water freezes In the September number of SCIENCE AND IN- and the temperature of the foremost scientific fiction writers. VENTION, an article entitled "Airplanes and Tanks to the bottom, but there are always fish swimming AMAZING STORIES has in it when it out again. secured the in the Next War," by H. Winfield Secor, con- around thaws sole rights to all of Jules Verne's stories, tains a statement .that, "In the next war, if it Experiments I found do not always prove the written falsity of a statement unless they are by this, the greatest of- all scientific should occur, one of the greatest problems the army truth or fiction writers. All of these stories will ap- experts will have to solve will be how to protect tried under the same conditions that existed when pear in the statement was made. No doubt many affi- AMAZING STORIES. our cities and towns from gas attacks by the ene- davits can be procured from reliable sources to Be sure to get your copy today. my." I think that I have an adequate solution for prove that fishes, toads and snakes are frozen up The magazine is edited by Hugo Gems- this problem, which I will now describe: and come back to life when thawed out. back. 'Gas attacks by air can only be effective if the PRICE 25c PER COPY. gas cloud is laid close over the city. Hence, if E. L. CORLE. the strata of air from the housetops of a city us Arkansas City, Kan. to about one thousand feet can be so guarded that it would not permit airplanes to enter, the city wi'i (In our artificial methods of freezing, we used he will be for some time, according to his last be safe as far as gas attacks are concerned. My ordinary water, not distilled water. This water letter. system will demand that captive balloons in groups was placed into a tank which was then put in the We think you of about eight or ten be sent up with a highly refrigerator. The temperature of the ice compart- will find Mr. Cummings' story, "Tarrano the Conqueror" very interesting as it explosive bomb that can be exploded by an electric ment was considerably below freezing. The only goes along, current controlled by a look-out in another captive way in which our conditions differed from yours and we are gratified at your interest in SCIENCE AND INVENTION. -EDITOR.) balloon or dirigible. Any large city will be divided was that the freezing experiments were made dur- into squares, each having its four air stations ing the summer time and not in the winter months. LIKES where captive balloons with highly explosive bombs Nevertheless we thank you very- much for your SCIENCE & INVENTION will be sent up. Enemy aircraft will not be able to comment and thank the tkousandi,of :other read- Editor.; SCIENCE AND INVENTION: send down the balloons by firing at- them, because ers who have commented upon- our article "Life I consider your magazine the airplanes_will have to keep about three hundred Suspended in Ice.. " This article carried with it areal educator in the field of science and especially liked the old issues feet away from the bomb to avoid the effect of the a great deal of interest, and we have heard from in which- gravitation, bomb exploding; besides, one shell will not be many readers who have claimed to have actually astronomy, Einstein and his theories, sufficient to - bring down all the balloons in the noted instances where fish, reptiles and toads and many of the vastly important scienti- fic subjects were discussed by your many authors. group. The extreme-difficulty of hitting the target, were actually frozen and then thawed out and on I which is the protective balloon, is another ad- the other hand have heard from _who have believe a school equipped with your magazines many - from the earliest dates possible to the present vantage of this system. carried out artificial experiments and who have time would B. SCHWARTZ, received the same results which we outlined. scarcely need a scientific encyclopedia. Your magazine contains more information consid- Brooklyn, N. Y. Our own experiments were meant to produce ering dollar artificially a state of completely suspended ani- for dollar spent than any other "grand" set of books in the library, because in your pub- (We have read the explanation of your system mation. When animation had been completely of preventing gas attacks in uture wars, but do suspended, we found that life did not return. Of lication more than one author discusses a sub- ject, because one would have to have more than not see that your system would prove particularly course there is always a possibility for a tech- efficacious in any way, as the bombing planes can nical error somewhere. No one has an encyclopedia to cover all the subjects you dis- as yet come cuss, and because your discussions are timely drop gas bombs from any height desired, and forth and given us any statements of experimental and probably would not drop them from any lower alti- proof and data for duplicating the experiments, right up to the minute. I make it my duty to study your magazines every month, and will cer- tude than four or five thousand feet over cities, or has demonstrated that such artificial hiberna- owing to anti- aircraft guns firing at them, etc. tion may be induced. -EDITOR.) tainly continue to do so. LELAND LOCKHART. The first thing about cities in a future war is Rock Falls. Ill. that, owing to their large area. they prove an easy (We are glad that you enjoy SCIENCE AND IN- target for bombing - from a kink altitude of from VENTION magazine and -we will try to make it ap- five thousand to ten thousand feet, or even twenty PAGE DR. HACKENSAW peal to you more and more every month. -EDITOR.) thousand feet, as the bomber can hardly fail to do a lot damage, can he miss the target in most Editor, SCIENCE AND INVENTION: of nor Editor- SCIENCE AND INVENTION: cases. No matter where the bombs land and burst, I have just received the November SCIENCE & I have been a reader of your magazine for over they will do a lot of damage for the immediate INVENTION and very much regret the demise of five years and thought I would write and tell you areas will be charged with gas. -EDITOR.) Doctor Hackensaw. When he - didn't appear in how I appreciate SCIENCE AND INVENTION. I alSO October, I thought maybe he had run out of - ma- would like to state that I have been to various 7 terial for the time being, but the fact that he is research clubs and heard many discussions on the still absent has --made nie' worried about the subject -Does a dream take as long as the dream Prize Winners` in our "Uses for Old Photo illustrious doctor. I have taken this magazine I seems, or is it a "flash" thought? I believe I did Films" Contest will appear in the May issue think from the beginning of its career and the have proof that it is an instant thought. Al- of SCIENCE & INVENTION. Dr. Hackensaw articles in my opinion were great. though you may know this, as I am in the com-

www.americanradiohistory.com 1122 Science and Invention for flpril, 1926 WRINKLES: RECIPES &, FORMULAS Edited by S. Gernsback CORK PULLER HAT PROTECTOR CANDLE HOLDER DOUBLE SHEETED NEWSPAPER

CANDLE

SHAVING STICK HOLDER

If a standard wire paper clip of the type shown is straightened out and the ends thrust SEAM through a cork so as to leave a small ring pro- The ordinary candle will not usually stand jecting as above, the cork can be readily re- When hats are to be put away for any lengthy upright on a smooth surface because of irregu- moved from a bottle by pulling on the ring. period of time, some provision should be made larities in its base. If it is placed in a metal The ends projecting past the lower end of for protecting them from dust. If two double candle shaving stick holder as shown above, twisted together. sheets of newspaper are placed on opposite will be overcome and the candle the cork should be to- this trouble -John V. Tallas. sides of the hat, and the edges sewed will stand straight. Author please send gether as shown above, ample protection will address. result. -Mrs. Helen Smar. PAINT REMOVER CEMENT CONCENTRATED SOLUTION OF CELLULOID

CRACK IN FLUTE

Paint stains that will not yield to ordinary ONION LEAVES soap can quickly be removed from the hands by applying a small quantity of carbon- disul- The odor of fresh paint is extremely nauseat- phide and rubbing off with a piece of cotton ing to many people and it is a difficult one to waste. The same system can be applied to A cement for mending such a musical instru- remove. If a dish of pieces of one or two cloth or woodwork. As it is very inflam- ment as a flute, a clarinet or an oboe or for onions is placed in a freshly painted room, mable use it away from any fire. -J. H. Byers. mending celluloid articles can be made by dis- the odor of the paint will be quickly removed. solving celluloid in amyl acetate or acetone. This is a simple yet efficient method of per- Make concentrated solution.-W. M. Goldberg. forming this work. -F. R. Moore. CLEANER HAMMER KINK BOTTLE OPENER GUM SPOT 111T CRACKER

CAN

PIECE OF ICC CLOTH is When chewing gum is found on clothing, If a wood screw is firmly imbedded in the When the screw cap of a bottle or can handle of a hammer or axe, as shown above, stuck, it can usually be removed by applying place a piece of ice against the spot and twisting when the gum has become hardened, due to the head will be found solidly attached and a nut cracker as shown above and up and the attendant danger of it flying off will be firmly and smoothly in the correct direction the cold, it can readily be broken Tubis. brushed off. -Henry H. Sweet, Jr. removed. Author please send address. for unscrewing. -Manuel

www.americanradiohistory.com Science and Invention for fl Aril, 1926 1123 MILK CAN SPOUT PAINT BRUSH HOLDER MELTING LEAD tummumuw- AIR HOLE -4- -RIGHT ANGLE PAPER SCR. SHEETS STUCK OF ON TIN TINFOIL

I

Trouble is often experienced when pouring evaporated milk from the can but if a small A very easily made type of holder for paint disk of paper is stuck to the edge of the can brushes is illustrated above. A right-angle with a little of the milk and allowed to dry in hook is screwed into the handle and by hook- When it is desired to make small objects place, a pouring spout will be formed which ing it over the edge of the can, the brush will from lead, the melting of that metal can be will render this operation quite simple. The always be just where it is wanted and the paper must expedited by first placing some tinfoil in the be placed so that it does not cover bristles will be kept soft because they are crucible. By doing this, the melting point the hole from which the milk is to be poured. immersed in the paint. -T. Bernard Slater. will be lowered and the melting can be done -G. L. Lepage. with a low temperature flame. -K. Liu.

ELECTROPLATING CORK EXTRACTOR 3 TO 6 VOLTS It sometimes OBJECT TO BE hap- ELECTROPLATED pens that the rope running overa pul- ley works over the edge and conse- quently jams. This can be prevented as described.

ROUND IRON OR STEEL SHAFTING

COPPER SULPHATE SOLUTION SHEET OF METAL A wooden box, the seams painted with tar or asphaltum, can be employed for an electro- To prevent the rope from running off, bend a plating tank. The electrode plate connected to length of round iron or steel rod as shown, and When a cork has been pushed down in a bottle positive pole should be of the same metal as fasten under one of the shaft nuts. This it can be retrieved will hold the rope in place. Author please with a wire hook bent and that which is to be deposited. -John Vomacks. send sharpened as shown. A ring on the opposite address. end aids the operation. -Joseph Kern. BOTTLE PROTECTOR SOLDERING LENSES PIECES TO BE RUBBER RING SOLDERED TOGETHER

LEAD,j 4 HYDROFLUORIC FOIL ACID

PLANO CONCAVE .E' LENS DOUBLE CONCAVE BUNSEN BURNER % ,,;vz 2; LL rl LENS Concave lenses may be made by allowing hy- Flat pieces of metal can be readily soldered drofluoric acid to act glass In order to on disks, con- prevent the accumulation of dust together by placing a strip of lead foil be- tinuing the action until the desired results on the mouth of a bottle, a rubber washer tween them along with some flux and holding are obtained. Two types possible by this may be cut and placed as shown in the above the assembly in a flame by means of a pair method are shown above. For a double con- illustration. Liquids can then be poured with- of pliers. See illustration above. cave lens, treat both sides of the disk. out contamination. -Manuel Tubis. -F. J. Wilhelm. -Mannie Stroh.

www.americanradiohistory.com 1124 Science and Invention for April, 1926

Latest Radio Broadcast News Below: The antenna masts and antenna of Station Keeping up -to -date with radio WHAP, from which jazz music is barred. is the aim of the majority of successful dealers and broad- casters as is evidenced by the modern delivery and service car shown in the photograph at the immediate right. Ad- vertising as well as utility are combined.

Left: The operating room at WHAP. This station is rated at 2,500 watts and the transmitter control panel is shown in the background of this photograph. Note how Above: The masts of station KFPG are of rather con- every part is handy to ventional yct rugged design. Below: The line ampli- the operators and is fier used at station WHAP. This is used for remote always accessible for control. adjustment.

IT is indeed a far cry from the original broadcasters at Pittsburgh, KDKA ; Newark, N. J., WJZ ; and Roselle, N. J., WDY, with their scratchy phonograph records and tinny sounding player pianos, to the elaborate up -to -date equipment and arrangement of the various broad- casting studios spread throughout the country today. It was only a few short years ago that we were perfectly content to clamp the headphones tightly to our ears and listen with bated breath to the faint whisperings reproduced by our crystal or one -tube set: Today, however, we demand the most perfect possible reproduction and enough reproduced volume to fill an entire house. Otherwise we are not satisfied. Obviously, it has been necessary to constantly design new apparatus and redesign old instruments for transmitting purposes in order to meet the increasing demand. Not only has this been done, hut, stations are becoming most particular in the types of programs that they broadcast for the general public. Years ago, any kind of music was received with gusto. Today, various radio listeners want to select their programs and pick and choose just what suits them. Things have gone so far that a new station, WHAP, recently opened on the east coast, made it a part of their policy to Barr jazz and other more popular types of music from their programs and to broad- cast only the classics and other more sedate selections. This station believes that the people today are developing more of a taste for the classical forms of music and so are catering to this demand. The suc- cess of their project will soon be determined. They have done every- thing possible to insure good transmission and are using a considerable amount of power. They should get out well and should fill a long felt want with many of our more sedate radio listeners. Aside from barring jazz, they also have eliminated advertising and propaganda of all kinds from their programs.

www.americanradiohistory.com Science and Invention for April, 1926 1125

WRNY for New York Visitors By CHARLES D. ISAACSON*

RE you coming to New York? Then EMITO ORTEZ V let me invite you at once to visit the BEN BERNIE Spanish prima don- RADIO NEWS Station at The Roose- .The maestro him - ~ na, who has starred velt. You will find the hotel one self," director of in opera in Italy of the orchestra which and France, whose the most beautiful in the country; and you enjoy three splendid soprano there you will hear one of the -'ery best hotel evenings a week is heard often at in WRNY's pro- orchestras I have ever known -I refer to gram. WRNY. Orlando's Roosevelt Concert Orchestra, un- i der the direction of Herbert Sohman. You have doubtless heard this orchestra play to you three times a week through WRNY. Here you will also see Ben Bernie, and dance to his syncopating tunes -that is if you stay at The Roosevelt, or dine here in PANCHO FUENTES FRANCINE VYDEI. Who joins to her the Grill Room. But quite apart from that, Whom you know voice his rich bari- please take this as your invitation tone, in the ro- to visit perhaps better on mantic Spanish the RADIO NEws Station on the eighteenth W RN Y's program floor, as "The Coloratura melodies which have also the RADIO NEWS Transmission Soprano." thrilled thousands. Room on the twentieth floor. We will be happy to meet you and to greet you. You will always find something happening, and Polonsky SUNDELSON always find many celebrities on hand. rT Samuel VERA folks Broadcasts through Assistant program WRNY will be glad to write you at WRNY the finest director, hostess any time and give you any information you and most soulful for WRNY's ar- desire in preparing for a visit to this city. violin concert num- tists and soother of bers. He is a pu- artistic tempers. FOR LOVERS OF DRAMA pil of Auer. By the way, are you listening in every night at 7.15 to the Radio Theatre Index? For visitors to New York, this list is in- valuable. Everyone who comes to the me- tropolis, of course, plans to attend the theatre, and does not want to waste an eve- ."" IACK WHEATONtt ning on a production that is only fair. The You have heard Radio Theatre Henrietta Angstreich Jack Wheaton's Index will give you the Whose Piano Danc- orchestra from exact information that you want -about the es - not dance and en- plays music, but con- WRNY you want to see -where they are play- selections joyed its strains of ing, the members of the casts, the type of cert lively dance music. based on dance plays, what you can expect in the way themes you know. TS of music, laughter, thrills, etc. ,lh Out -of- towners are asked, at this point, to Channing Pollock write to the Program Director and tell what CT Sergei IUibansky Distinguished play- A famous teacher wright, author of this Index means to them, and how valuable of singers, who has "The Fool" and it is proving. instructed many "The Enemy," is eminent artists, is a frequent visitor THE SHOPPERS' ADVISER the conductor of a to WRNY. Another feature at WRNY that is par- series at WRNY. ltd ticularly valuable to visitors to New York R is the Radio Sales Analysis. Visitors to New York want to buy ; they want to buy the best things that are offered, and get the best values ; and every morning is now selecting the most interesting Charlotte Trystmaniki WRNY t This gifted little offerings of the better grade department e )OHN ADAM HUGO pianiste is but 11 Composer of "The stores and shops, for the benefit of the Temple Dancer," years old, thougl will en- you may find dif- women particularly. This service is now preparing ficulty in believing able those who are planning to come to New the first opera it, after hearing written for radio York in the next few clays to know just production. her at WRNY. which stores to shop at, and which stores are offering the things that visitors are anxious to buy. LJ l Walter F. Greeninger ^ ROMUALDO SAPII You have heard GUIDE TO THE CHURCHES The veteran oper- him in "Harper's atic conductor of Magazines's" reg- For those who seek religious information whom you will ular book reviews (Continued on page 1148) read more in this at WRNY. article, is now di- recting at WRNY, íf1

MAURICE SCHWARTZ The famous director of the Yiddish Art Theatre, who has made "The Dybbuk" a dramatic success in two ' KENYON CONGDON re- Harry Finkel. M. D. Who recently made languages, appeared Whose talks on his debut in radio cently at WRNY in char- "Diet" are not the from WRNY. Mr. acter as "The Meshulach," least interesting of Congdon possesses supported by his cast of ver- WRNY's weekly a baritone voice of players in a special features. He tells distinction. sion of this play adapted for the radio. what foods suit AA i1. 17,117

F Program Director of WRNY.

www.americanradiohistory.com Science and Invention for April, 1926 The Radio Constructor How to Build a "B" Battery Eliminator for Alternating Current That Delivers Excellent Results and Is Not Noisy

By A. P. PECK, Assoc. I.R.E. Fig. 1. The panel view of this home -made "B" eliminator shows the relative positions of the two voltage control knobs and of the snap switch in the "A" battery and 110 -volt A.C. circuit. have some and the rectifier. There has recently appeared In a "B" eliminator, we must WHEN contemplating the design is neces- battery elim- on the market a type of rectifying tube that sort of step -up transformer. This construction of a "B" sary for two reasons. First, the rectifier inator, usually called "B" eliminator, can be employed for rectifying or changing of the cycle of an alternating tube employed will not operate properly at there are a good many things that must be both halves voltage foremost, current and that will deliver a pulsating di- 110 volts potential and second, the taken into consideration. First and through any rectifier will be so great desire is to produce an elim- rect current on the output side that can be drop our greatest exact con - that if the 110 volt A.C. line is employed inator that will operate satisfactorily and easily and properly filtered. The of this tube is shown in the photo- without an intermediate transformer, the consistently and that will not give rise to struction rectifier will not be loud graph on these pages and it will be noted that voltage supplied by the any audible hum either in the phones or the receiving set regardless of which type of repro- the elements are cut in half so as to show sufficient to operate speaker, this properly. ducer is employed and regardless 'of how the internal construction. Inasmuch as many stages and what type of audio fre- quency amplification is used. Then we must also have safety. It is not wise to wire up The to be Right, Fig. 2: any kind of an electrical instrument rear view of the operated from the lighting circuit, and do so "B" eliminator with in a haphazard manner. We must provide the special rectifying good insulation for all of the circuits used tube in its socket and we must guard in every way against shows the placement possible short circuits, which last will be of the various parts. attended with at least blown fuses if not To the extreme right fire. Also, the is the transformer with actual danger from and to the extreme finished "B" eliminator unit must be built left is the choke with the point in view in its construction coiL In front of the that it can be used with any radio receiving transformer is a set and will not look out of place. Ease socket to be con- of control must also be incorporated. All nected to the 110- of these various points have been duly con- volt A.C. line. which sidered in designing the `B" eliminator .- - will be described in the following paragraphs, and there is at least one novel point incor- is purely a constructional article, we will not After the current delivered by . the trans- porated in this instrument which the writer enter into the discussion of the theory of the former has been rectified by the tube, it is has not as yet seen in any home -made elim- operation of this tube at this time. It is suffi- necessary to properly filter it so that the inator. This new point is in the switch that cient to say that the tube does not employ any current will no longer be pulsating in char- is employed. When everything is hooked up filament that can be burned out and, there - acter but will be as near pure D.C. as is properly, the "A" battery switch on the re- `ore, with proper care it will last for a good possible to produce. It must be emphasized ceiver is disregarded and the entire set is ong time. The manufacturers claim a tube here that the desired results cannot be ob- controlled by means of the snap switch placed ife of many years, and it is almost impos- tained with a cheap or inefficiently designed on the panel of the "B" eliminator unit. This sible to measure the length of time that one filter. If a large, well made choke coil and snap switch is connected in both the 110 volt of these tubes will last when not subjected a high capacity condenser or group of con- A.C. circuit and the "A" battery circuit. to abnormal voltages. Inasmuch as a recti- densers is not employed, the resulting current More of this later. fier of this type will handle up to 300 volts, delivered to the set will not be sufficiently DOUBLE WAVE RECTIFIER TUBE there need be no fear of harming it if the pure to give good reception results. A hum in practically all cases that the In making up a "B" eliminator, one of the type of transformer called for in the list of indicates most important parts of it is found to be parts given is employed. filter is not correct.

14° C8

DRILL HOLES FOR VARIABLE RESISTANCE SHAFTS

LIN

DRILL HOLES FOR SWITCH,S DRILL 3 HOLES 2" 7" ' FOR MOUNTING B+ Bi B+ PANEL TO BASEBOARD TO 'A' POSTS DET. RADIO AUDIO FIG.5 -PANEL LAYOUT - ON SET FIG.6

and the filament circuit and also Fig. 5 shows the panel layout and Fig. 6 the complete schematic layout of is connected in both the lighting circuit the "B" eliminator. Note how the double -pole single -throw snap switch how the negative "A" post is utilized.

www.americanradiohistory.com Science and Invention for April,1926 1127 SPLIT CHOKE COIL are ample to provide the necessary variations both cases, the operation is precisely the same In the unit that is illustrated on these in voltages. By mounting the two variable and the only difference noticeable is that pages, the choke coil has an inductance of resistances on the panel of the eliminator, when the `B" eliminator is employed, the 100 henrys total and is split in the middle so ready control of the detector and R. F. plate volume delivered by this set is greater than that the necessary connections for the var- voltages is obtained. The eliminator shown with "B" batteries. In fact, with most of the ious condensers can be obtained. This type, in the photographs in Figs. 1, 2 and 3 is now sets that have been tested, it is possible to especially designed for "B" eliminators, is now available on the market and can be RI obtained at a very reasonable figure. +A -AR +A +1B ±B t6 C3 ANDC6 MATERIALS USED Letters correspond to those given on photographs and drawings. T- Transformer, 110 volt, 60 cycle A.C. input -200 to 250 volt A.C. out- put. C and C1- .Inzf. fixed condensers. C2 and C3 -2nzf. fixed condensers. C4 and C5 -4mf. fixed condensers. C6-.5 nzt fixed condensers. C7 and C8 -two 50 henry choke coils in separate cases or in one unit. R-Double wave rectifier tube. R1-Fixed 7,500 to 12,500 resistance of carbon rod or wire wound type. R2- Variable resistance of 10,000 to 100,000 ohms. R3- Variable resistance of 1,000 to 10,000 ohms. S- Double -pole single -throw indicat- ing snap switch. All fixed condensers must be tested at 500 volts. C5 In order to adapt a "B" eliminator to all Fig. 3. In the top view of the highly efficient "B" battery eliminator described in these columns, types of sets, there must be at least two the reader can readily perceive how every instrument is laid out on the baseboard and on the variable output voltages. panel. This is about as compact a unit as can be easily and efficiently constructed. First, the voltage Photos courtesy General supplied to the detector tube must be com- Radio Co. and Allen-Bradley Co. paratively low and this is obtained by con- in use in the writer's laboratory, in connec- use only the first stage of audio frequency necting a 10,000- to 100,000 -ohm variable re- tion with the four tube tuned radio frequency amplification for stations operating within sistance, R2, in the circuit as shown in the receiver described in the March issue of a radius of 200 to 300 miles. To use the diagram in Fig. 6 and Fig. 7. Then again, SCIENCE AND INVENTION Magazine. With second stage of amplification on nearby local most multi -tube receivers employing radio this combination, excellent results are stations is usually disastrous to the loud frequency amplification require a lower volt- obtained and there is absolutely no hum. In speaker. age for the R.F. amplifying tubes than for fact, it is practically impossible for anyone OPERATES the A.F. amplifying tubes and this is ob- to tell whether the "B" eliminator or "B" MULTI -TUBE SETS tained by means of the resistance R3. The batteries are used when one is substituted A good many people want to know just voltage drops across these two resistances for the other without their knowledge. In (Continued on next page)

B+ B+ B+ B A+ A A+ TO IIO V. --/1 AUDIO RADIO DEE 60 CYCLE A.C.

In order to make the wiring of a "B" eliminator easy, we have made up a is reproduced in Fig. 7 above. Note that the grid connection to the socket wiring diagram of all the component parts illustrated in perspective and it is not used and that all metal cases connect to - B.

www.americanradiohistory.com 1128 Science and Invention for April, 1926 to the "on" position. Also, when reassembling the switch, after connecting up the terminals, How To Build be sure that the indicator dial is positioned a "B" Eliminator correctly in relationship. to the switch arms. After you have made all of these connections (Continued from preceding page) and run the wires from the "B" eliminator to the set, you can connect a metallic strap or a short piece of wire across the two ter- minals of the "A" battery switch that is one thing about a "B" eliminator, after they incorporated in the receiver and can then find that it is free from hum. That is, "Will turn both the "A" battery and the "B" elim- it operate a multi -tube set ?" The answer inator off or on by merely turning the snap for this `B" eliminator is, "Yes." It has switch. In case your set employs filament been tried on various types of sets up to and control jacks, they can be disregarded as it including six tube receivers and the manufac- is only necessary to leave the plug inserted turers of the parts and of the tube claim that in one of the jacks and turn off the snap it can be employed for any type of set using switch which will automatically extinguish 12 tubes or less. Therefore, it is obvious the tubes and also break the input circuit that an eliminator of this nature will be to the "B" eliminator. any of the most satisfactory for operating INSULATED WIRE usual receivers that are in use today. USE And now, .we come to the switching ar- When wiring up this unit, probably the rangement employed wherein a double-pole best wire to employ .is No. 14 solid conductor single -throw snap switch is used. One of with a heavy layer of rubber insulation. This the poles of this switch closes the 110 volt will effectively guard against short circuits A.C. circuit through the primary trans- and still is easy to bend and to use for mak- former and the other closes the "A" battery ing connections. Be sure to place a soldering circuit. You will notice that there are seven lug under each instrument as it is mounted binding posts on the terminal block. Four and connect all these lugs together. Also of them are for the "B" potentials and the connect them to the negative side of the "B" other three are for the "A" battery. The supply as shown. in Fig. 7. Then be sure center one of these three is merely a con- that one side of the "A" battery in the re- venience post and can be eliminated if desired, ceiver that the eliminator is to be used with but standard binding post strips have seven is grounded. Taking these precautions will holes in them, so why not use seven binding prevent stray electro- magnetic fields that posts and have added convenience? The emanate from the coils of the transformer is not connected to any part of and choke coil from affecting the inductances center post radio circuit but is merely used for tying to- incorporated in the receiving set proper the and, therefore, all possibility of any hum in gether the negative lead from the "A" bat- Fig. 4. This illustration shows the rectifier tery to the eliminator and from the elimi- tube that makes a good "B" eliminator pos- the reproducing unit will be avoided. inator to the set. The exact connections will sible. Elements are in cross section. After you have placed an eliminator in courtesy Raytheon Mfg. Co. it may be found necessary to in- be plainly evident by reference to the circuit Photo, operation, diagrams given in Figs. 6 and 7. Be sure the A.C. circuit and the "A" battery circuit crease the value of the "C" battery in order (Continued on page 1146) that you hook this switch up properly so that will be completed when the switch ,is turned A Five Tube Tuned R.F. Receiver gether" that efficiency is sacrificed. In this particular set, there is no crowding of parts, yet there is no waste space. This is ac- counted for by the fact that some of the instruments are set quite far back from the panel resulting in a symmetrical and pleasing layout. In this set, regenerative and tuned radio frequncy amplification are combined in such a manner that the best features amplifications are Above: Bottom view of set described here. Above : All of the instruments mounted on of both of these types of wires are undesirable feat- Transformers support sub -panel. special brackets and the connecting retained and some of the Photos courtesy plainly shown. Hammarlund -Roberts.

ures of each are elimi- THE general trend of the radio manu- nated. As will be noted, today seems to upon reference to the facturer schematic diagram of be toward the exploita- 4 tion of complete kits the set given herewith, for the construction of the radio frequency am- radio receiving sets. By plifier is neutralized. putting out materials in This makes set quieter. this form, the manu- In order to avoid facturer saves the con- overloading the l a s t structor a lot of work audio frequency ampli- and also aids him in get- fying tube, two stand- ting the best possible ard tubes of the UY- results from his par- 201A type are connected ticular set. In these in parallel. If after do- columns we describe an- ing this, an audio fre- other receiver that has quency whistle is found been made up from a to be present, it can by standard kit of parts 9(go often be eliminated 0 30 40 50 6 TO .8ó 106 con- and that is exceptionally -C -C -A +A -B +B +B +B connecting a small R.F & 2g.A.F +C 45V. 90V. 90-135V denser from grid to easy to build. Further- tST.A.r. 4-9V. DET. R.F.& 2D.A.F, more, this is one of the , 4yty - . -1S7A.F.. plate of one of the last five -tube :C' BATTERVJ"'A' BATTERY 'B' BATTERV audio frequency ampli- most compact in is avail- simplicity. Regeneration is fying tubes as shown receivers that The schematic diagram of this receiver reproduced above shows its in the cir- is employed circuit in order to increase sensitivity, and one stage of tuned R.F. dotted lines able today and that in the detector cuit diagram. ,not so "pushed to- also helps. Last two tubes are connected in parallel for greater volume.

www.americanradiohistory.com Science and Invention for April, 1926 1129 A Highly Efficient Six Tube Receiver Three Stages of Tuned Radio Frequency Amplification Gives Sensitivity and Selectivity to a Remarkable Degree Above: Fig. 1. The panel view of this receiver shows the positioning By L. ABRAMS of the two main tuning control dials and of the other variable components. Note that vernier dials are absolutely essential with this receiver if the best possible results are to be obtained.

UP to the present time, the majority erly over the entire band of broadcast wave- shielding is employed. In order to facilitate of manufactured and home -made re- lengths and will give excellent results with- this work and to produce a satisfactory ap- ceivers of the multi -tube type have out the frailties usually found in multi -stage pearing set, there is a company manufactur- been limited in scope to two stages receivers. ing a complete metal panel and cabinet for of tuned radio frequency amplification. The SHIELDING THE SET housing a receiver addition more of this nature. The panel of stages of this type of am- There is one thing that we must not fail is sold drilled and ready for the bushings plification, except in Super- Heterodyne re- to mention in connection with this set and that insulate the various instruments ceivers has been considered from by most radio that is the problem of shielding. Shielding each other and the front surface is men as impractical. of it Of course, there have in this type of receiver is not done for the engraved. Any reader desiring- further in- been a few isolated instances where really usual reason of attempting to eliminate body formation on this subject interested experimenters will receive the have constructed sets capacity, but rather so as to reduce interfer- same upon request and receipt of a stamped employing three or four stages of radio fre- ence from nearby sources and to increase the addressed envelope.

3 OHMS 5 2N0

i/tion\^r^ s;.

BALANCING =2ND o o , \' RESISTOR AUDIO 00035 MF .ÓO035 MF TRANS. TANDEMrl TANDEM CONDENSER (ill CONDENSER FIL SW. R FOUR POINT I MF IMF ANTENNA 5' TO SHIELD

4 ¡ I OEM WVVVI'^MrVj0 - !!! IST AUDIO ` P IFIXE D FIL. G¡ o RESTS ós MI GND. N0.3 '1p NO NO.1 ` NO 4 etotTe 2 MEG BALANCING BALANCING BALANCING CON D. COND. CON D. Above: Fig. 2. This picture diagram shows the relative positions of the densers placed between the inductances and the tiny verniers or "trim- various instruments used in this receiver and also illustrates how tha ming" condensers that are integral parts of the tuning units. The shortest leads can be made between the parts. Note the balancing con- adjustment of these capacities is critical and must be carefully made. quency amplification, but usually the results selectivity of the entire unit. If the panel Because of the fact that specially designed were not all that could be desired. In the and cabinet of this set is completely lined manufactured inductances are the only ones case of the set under discussion, however, with copper or tinfoil, the wiring and coils that will give really satisfactory service in it has been found entirely possible and prac- can not pick up stray currents and so pass this highly sensitive receiver, we do not give tical to use three stages of tuned radio fre- them on to the reproducer. Only that current the winding data on the coils. They are quency amplification and to so balance the which enters the receiver through the an- made in the well known toroid form and this entire set that the receiver will work prop- tenna will be amplified and reproduced when type of inductance is extremely difficult for the average amateur to make. Therefore, it is not wise to attempt this phase of con- structional work, although if the reader is particularly desirous of doing so, references can be furnished as to where constructional details are available. OSCILLATION CONTROLS In the circuit diagram of this set, a balanc- ing resistor will be noted. This is of special design although it is available on the market and consists of two resistances connected in series and arranged with two arms so posi- tioned that as one resistance is increased, the other is decreased. This operates as a vol- ume control as well as an oscillation control. After this receiver has been constructed, it must be very carefully balanced and this is done by means of the three low capacity bal- ancing condensers and the small "trimming" condensers mounted on the regulation tandem tuning condensers. When adjusting the bal- Above: Fig. 3. The set illustrated was constructed of standard manufactured parts and wired ancing condensers for proper operation, use with the flexible leads provided by the makers. With this system no knowledge of soldering is a long wooden or other insulating stick at necessary and anyone can wire up a complete six tube receiver in a very few hours. The ends least 15 inches long and sharpened at one of the flexible leads are equipped with terminals, making connecting easy. end after the manner of a screw driver edge.

www.americanradiohistory.com 1130 Science and Invention for April, 1926 RADIO ORACLE In this Department we publish questions and answers which we feel are of interest to the novice and amateur. Letters addressed to this department cannot be answered free. A charge of 50c. is made for all questions where a personal answer is desired.

,-1' NM IIIIINIIiIi jIIIilll! INVID MI

Fig. 2. With this system, the crystal detector may be used alone or Fig. 1. With the circuit diagram shown above, it is possible to employ either one or of switch S, it may be used with an amplifier. two tubes and to automatically control the amplifier tube filament. by means "LC" TABLE LC value for 200 meters is .01126. Dividing this DUPLEX CIRCUITS by the maximum capacity of the condenser or 1. Terrin, Washington, D. C. (458) Q. 1. Albert King, Bronx, N. Y., asks: (459) Q. Louis .0005 vif., we lind that the coil to be used with -circuit diagrams by means of asks: Kindly give the LC values to be used in tun- this particular condenser should have an induct- Kindly show two Also a list of the which the following effects can be obtained. (A) ing units from IO to 500 meters. ance of 22.5 microhenrys. Show how two tubes can be hooked up with a single corresponding frequency in kilocycles of various double -pole double -throw switch so that either the wave -lengths. MULTIPLE PHONE CONNECTIONS used alone or A. 1. The table appended gives all the required regenerative detector tube can be 1. J. R. Cormauy, Lonoir City, one stage of audio fre- information. The value LC is the product obtained (460) Q. so that the detector and Tenn., says that he has a standard type of one - This should by multiplying the inductance of a coil .in micro - quency amplification can be employed. tube set but cannot use more than two pairs of be arranged so that the filament circuit of the audio henrys by the capacity of a shunt condenser in extinguished when the microfarads. When using this table suppose that phones in series on the set at the same time. He tube will be automatically asks us if we can suggest any remedy for this. detector is being used alone. I. do not want to use we have a condenser with a maximum capacity of a standard single coil crystal .0005 and we desire to obtain the inductance of a A. 1. When you put more than two pair of jacks. (B) Show in circuit of your detector tube, with one stage of audio frequency coil that will enable us to tune to a maximum wave - phones the plate detector circuit, becomes so great that your set amplification, and a double -pole double -throw len ^'h of 200 meters with maximum condenser the resistance switch so arranged that the crystal detector can be capacity. Referring to the table, we find that the fails to function properly. The best thing for used either alone or with you to do would be to the amplifier. In this obtain one of the devices the tube need not on the market today case which are designed to be extinguished automa- -length, be Chart for Deter mining the Wave Frequency and LC Value for Radio have placed therein a tically as this will reproducing controlled by a push -pull Frequency Circuits single unit (L is in mic )rohenries and C in microfarads.) or telephone. Four or twitch. more rubber tubes radi- A. 1. The two re- circuit diagrams Nave Wave Wave ate from the cover of the quested Length Frequency LC Length Frequency LC Length Frequency LC unit and terminate in are given in these col - to (Meters) (liiloey,le3) Value (Meters) (Kilocycles) Value (Meters) (Kilocycles) Value pairs of ear -pieces sind- linms. Referring Fig. lar to a stethoscope. Also 1, all of the constants 10 30.000.00 .0000282 65 4,615.00 .001188 230 1,304.00 .01489 and .0000340 286.00 .001378 1,277.00 .01555 try connecting phones are standard. L. L1 11 27,273.00 70 4 235 in three 12 25,000.00 .0000405 75 4,000.00 .001583 240 1,250.00 .01622 parallel instead of in 12 are a standard series. circuit tuner. C has a 13 23,076.00 .0000476 80 3.750.00 .001801 245 1,255.00 .01690 capacity of .00025 inf., 14 21,426.00 .0000552 85 3,529.00 .002034 250 1,200.00 .01760 Rl and R2 are rheostats. 15 20,000.00 .0000634 90 3,333.00 .002280 255 1,177.00 .01831 LOCATING POWER 16 18,748.00 .0000720 95 .002541 260 1,15 4.00 .01903 LEA KS R3 is a 1 to 5 megohm 3,158.00 a capa- 17 17,646,00 .0000813 100 3,000.00 .002816 265 1 132.00 .01977 1. J. A. grid leak, C2 has .0000912 (461) Q. .001 mf. and S 18 16.667.00 105 2,857.00 .003105 270 1,111.00 .02052 Moorefield, Charlottes- city of .0001016 110 .003404 275 1.091.00 .02129 double - 19 15,788.00 2,727.00 con- is a double -pole .0001126 .003721 280 1,071.00 .02207 ville Va., has had throw switch. When the 20 15,000.00 115 2,609.00 siderable trouble while to posi- 21 14,284.00 .0001241 120 2,500.00 .004052 290 1,034.50 .02366 his radio re- switch is thrown 22 13,635.00 .0001362 125 2,400.00 .004397 295 1,017.00 .02450 operating tion 1, the detector is ceiving set from inter- in 23 13,042.00 .0001489 130 2,308.00 .004757 300 1,000.00 .02533 used alone and when 24 12 500.00 .0001622 135 2,222.00 .005130 310 967.70 .02705 ference probably caused position both tubes 25 12,000.00 .0001755 140 2,144.00 .005518 320 937.50 .02883 by leaks in power lines. e employed and the 26 11,538.00 .0001903 145 2,069.00 .005919 330 909.10 .03066 He asks how leaks of this filament of the second 27 11,110.00 .0002052 150 2,000.00 .006335 340 882.40 .03255 nature can be located. tube is lighted. 28 10,713.00 .0002207 155 1,935.00 .006760 350 857.10 .03448 A. 1. The only prac- In Fig. 2, the'request- 29 10,343.00 .0002366 160 1,875.00 .007204 360 833.30 .03648 tical method of locating ed crystal circuit is 30 10,000.00 .0002533 165 1 818.00 .007662 370 810.80 .03854 interference of the na- shown. Cl may be a 32 9,374.00 .0002883 170 1,765.00 .008134 380 789.50 .04065 ture you mention is to mf. condenser, Ll 34 8,823.00 .0003255 175 1,714.00 .008620 390 769.20 .04277 use a loop connected to .0005 tube re- a standard tuning coil to 36 8,333.00 .0003648 180 1,667.00 .009120 400 750.00 .04503 a two or three cover t h e broadcast 38 7,894.00 .0004065 185 1,622.00 .009634 410 731.70 .04733 ceiver. This should pre- save- length band, D, 40 7.500.00 .0004503 190 1,579.00 .01016 420 714.30 .04966 ferably be of the oscil- detector and 42 7,143.00 .0004966 195 1,538.00 .01071 430 697.70 .05204 lating type so as to be the crystal 44 6,818.00 .0005446 200 440 S, the switch. At posi- 1,500.00 .01126 681.80 .05446 more sensitive to inter- S, 46 6.522.00 .0005960 205 1,463.00 .01183 450 666.70 .05700 ference of the nature tion C of switch the 48 6.250.00 .01)06485 210 460 652.20 .05960 crystal is used alone and 1,429.00 .01241 you mention. The outfit vac- 50 6,000.00 .000704 215 1.395.00 .01301 470 638.30 .06,219 could then be carried at position T, the 55 5,454.00 .000852 220 1,364.00 .01362 480 625.00 .06485 tube is used as an around t h e locality cum 60 5,000.00 .001014 225 1,333.00 .01425 490 612.20 .06759 where trouble is experi- audio frequency ampli- 500 600.00 .07039 fier for the crystal de- enced and by swinging tector. With the latter the loop, the general di- combination good qual- rection of the leak could ity is had with increased The chart for determining wave -length, frequency and LC values often comes in handy for use in be determined. Use the solume. various radio calculations. Clip this table out and keep it for reference. triangulation method.

www.americanradiohistory.com Science and Invention for April, 1926 1131 J LATEST PATE

IRON STAND WRENCH GOLF DEVICE RADIO DOLL No. 1,564,222 issued to Charles L. No. 1,567,530 issued to Ronald G. Dunlap protects a novel type of open Macnaughton and Morton R. Walker end wrench shown above. The jaws are interchangeable and the walls of the jaws are of varying thicknesses so the that actual openings for ap- CIRCULAR plication to angular projections may \ /TRACK

LOUD SPEAKER

INTERCHANGEABLE JAW STAND No. 1,564,517 issued to Walter Ber- be changed and therefore the same protects a device designed for the TUNING nard Brolin is illustrated below and handle may be continually used on use of golf players and so construct- CONTROLS protects an unusual type of automatic various sizes of nuts merely by chang- ed as to teach them to properly "fol- stand for sadirons. As shown, grasp- ing the jaws. The interchangeable low through" their swing. The golf No. 1,565,145 issued to Beulah L. ing the handle of the iron folds up part is equipped with a spring clip stick is loosely attached to a runner Henry was obtained to protect the the stand. When the handle is re- which frictionally engages with the on a circular track so that the oper- design of a combination doll and com- leased, a spring action raises the iron handle and prevents accidental dis- ator must continue his stroke. plete radio set of the type shown in off the surface to position shown. placement of the jaws when the the above illustration. A combination wrench is in use. of this nature should be attractive in CALENDAR PAD many ways without any detrimental effect on the operation of the set. PAD CLAMP AND STAND CALENDAR COIL MOUNT MOISTENER REFLECTOR INDUCTANCES, N N No. 1,565,979 issued to Joseph Bach- No. 1,566,327 issued to George John- rach covers the design of a moisture son was allowed on the simple de- applicator shown above. A small il- sign for a lamp shade or reflector tube is filled with water and is REFLECTOR 11-31n1r111 runu umr m I é _ WATER I 1 WICK 1

No. 1,566,054, issued to Frank A. THREADED ROD PANEL. Weeks describes a very simple type IIiIIIIIIIIIIIIHnu of calendar pad stand illustrated No. 1,565,206 issued to George F. above. The base is a piece of sheet Ruzicka covers the design of a vari- APPLICATOR metal and the pad clamp and stand is SPRING INCANDESCENT able mounting for different types of a piece of metal rod to the bent CLIP BULB radio inductance coils. As shown, equipped at the end with a cylindri- shape shown, threaded at one end one inductance is stationary and the cal applicator. A wick conducts and equipped with a ball or other lustrated here. A simple spring clip other is mounted upon a threaded water to the surface of the applicator protective tip at the other end. holds any desirable size or shape of rod. By turning the control knob, which is rolled over the surface to be Thus simplicity is combined with reflector to a standard incandescent the distance between the two induct- moistened. In this way, quick and ruggedness. bulb. ances can be critically varied. easy moistening is obtained. ANIMATED TOY DOG TONGUE MOVES., HOLE CHAMBER IN /PIVOT PARTITION LEAD PELLETS

TAIL WAGS

F1 G.1 FIG.2 F10,3 FIG.4 FIG.5 No. 1,564,785 issued to William W. Harris describes one of the cleverest in Fig. 3. It is then placed in position Fig. 4 and the lead pellets start to mechanical toys that has come to our attention in some time. Operating roll through the hole in the partition shown. Hitting projections on the tail without springs or other devices that necessitate winding, this mechanical shaft, the tail is caused to wag. As the weight of pellets in the lower end dog wags his tail, moves his eyes, lower jaw and tongue and sits up. This of the chamber increases, the eyes, jaw and tongue move and finally the dog, is all accomplished by the movement of lead pellets placed within a chamber without any assistance assumes the position shown in Fig. 1. This is in the dog's body. The dog is first placed upright in the position shown in caused by the weight in the lower end of the chamber overbalancing the Figs. 1 and 2 and then rotated in a counter clockwise direction to position body.

NOTICE TO READERS. The above illustrated and described Washington, D. C., give only the addresses of the inventors devices have recently been issued patent protection but are not at the time of application for a patent. Many months have as yet to our knowledge available on the market. We regret elapsed since that time, and those records are necessarily inac- to advise that it is impossible to supply the names and addresses curate. Therefore, kindly do not request such information. of inventors of the above devices to any of our readers. The only records available, and they are at the Patent Office at -EDITOR.

www.americanradiohistory.com 1132 Science and Invention for April, 1926 Scientific Humor

GIVING HIM THE MITTEN REINCARNATED CUSTOMER: "This $7.00 fountain pen you First. Prize $3.00 QUACK SIDESHOW ANNOUNCER: "On my sold me for 99 cents leaks." right you will perceive Cleopatra's skull at the age of 21. The other is at the age of SALESMAN : "Ah, yes, you need one of our HIS OESOPHAGUS WAS HIS patented rubber writing gloves. Thirty -five TEST 35." -Frank E. Miller, Jr. cents, please. " -Leslie F. Carpenter. "I wish to NOT HARD TO BELIEVE MANY OF US DO commune It is easy to believe cigarettes ruin a wom- with the spir- on SHE: "I think the radio is such a wonder- its," stated the an's complexion. Smoke always is hard ful invention, don't you ?" smart chemis- paint.-R. W. Hicks. HE : "Yeah-there's one thing about it I try student as like, anyway." he stepped up NO ROOM FOR NEW IMPROVE- SHE: "Why, what is that ?" to the lab. MENTS HE: "Well, you can listen in on the supply win - HE : "You must admit Man is a wonder- broadcasting of the Sunday school lesson on dow to get ful invention." your radio, and when they announce passing some C, H, SHE: "Maybe so. But Woman is an im- of the collection plate you can just sit back OH in his test tube. provement on that wonderful invention." and smile without even kickin' in a nickel." - -John H. Spicer. HE: "Is that so? Now I know what Harmon C. Shelby. keeps the young men out all night." SHE: "Why so ?" HE'S PICKING ON THEM CAUSE FOR CORNS ON THUMBS HE : "They are looking up new improve- REFEREE (blowing whistle) : "Foul." An Automatic Lunch: Where nickels are ments."-H. Ward. SPECTATOR: "Where are the feathers ?" so thin from use it looks like the Indian is REFEREE: "Ain't any, this is a picked riding the Buffalo. -Ted Thompson. HELPED HIM KEEP COOL team. " -Raymond Costello. After the alarm of fire was HE MIGHT TRY AN INK E -RAZER WE receive daily from one to given in a hotel, ¡DARN I17 "I see where two hundred contributions to ' one of the guests Mr. Jones tried this department. Of these only joined his friends to kill himself one or two are available. We desire outside and last night by cut- to publish only scientific humor and laughed at them ting his throat." all contributions should be original if for being so ex- "Did he die ?" possible. Do not copy jokes from old cited. "There is "No." books or other publications as they nothing to get "How's that ?" have little or no chance here. By excited about," "Why he used scientific humor we mean only such he said, "I took my time about dressing, one of those new lighted a cigarette, didn't like the knot in jokes as contain .something of a. scien- fangled "Double - my necktie, so tied it over again. That's life" razo blades."-Marvin Moore. tific nature. Note our prize winners. how cool I am." !Write each joke on a separate sheet "Fine," one of his friends said, "but why A VOID and sign your name and address to it. didn't you put on your pants ?" Write only on one side of sheet. We -J. L. Sims, Jr. "Where I spent Christmas last year the Please thermometer dropped to zero." cannot return unaccepted jokes. "That's do not enclose return postage. EXCITING FIELDS OF FORCE nothing." published here are paid "What's nothing ?" All jokes the short - at the rate of one dollar each, be- "Well!" exclaimed the judge of "Why, zero. Klayde Spaur. for is "- the first prize of three dollars circuit court, "What I want to know when sides ohm, where for the best joke submitted each Watt caused Rheo Stat to walk RUNNING KEEPS IT WARM month. In the event that two people did Volt meet 'er ?" "Just as she had crossed the magnetic WIFE : "Is it cold ?" send in the .same joke so as to tie for field, I saw the motor pick her up, your HUBBY : "Yes, mercury's running down the prize, then the sum of three dol- Honor," replied the lightning arrester of the the thermometer to keep warm. "-Edw. E. 1 lars in cash will be paid to each one. Grathwohl, Jr. Electro Motive force. "Then," said the judge, as he turned to the WE WONDER WHAT HE SAID man who was charged with animal magnet- RADIO OR BABY OH ism, "I will give you thirty days behind the FRANK : "You know, Hank, one night BILL : "Radio is in its infancy." bus -bars, and if that fails to transform you, Bill and I were out riding and Bill was all JACK : "Yes, I know that - by the way it clothes. Well, along I am going to kill -a- Watt. " -Patrick J. howls." -Edw. E. Grathwohl, Jr. dressed up in his best Lynch. about 11 :30 we got lost, but we saw a sign ahead of us and Bill said he'd climb up it AN HE GOT AN AIRING and light a match to see what it said. So WHEN "Son, I have he did." APPENDIX proved to you HANK: "And what did it say ?" IS CUTE that anything FRANK : "Wet paint. " -Leonard M. Asher. D O C T O R : filled with air will "I think you have go up. Have you AN IMAGINARY NUMBER acute appendi- any questions to PROFESSOR: (on citis." ask ?" entering c 1 a s B- FLAPPER : SON: "Pop, room : - "Gen- "Oh Doc, ain't what's keeping tlemen, the sub- you the flatterer." you down ?" ject to be dis- -W. B. Grant. -Harold Hoyt. cussed today is liars. How many CURRENT EVENTS OR A DUCK ON THE SHORE of you have read the 6th chapter of SON : Father, why does a woodpecker MAUD: "Dad, what is a drydock ?" usually peck on telephone poles? DAD: "What? A drydock? Well, a the text ?" Evidently the FATHER : I suppose they are looking for thirsty surgeon, I presume. "-Martissiano the currents. -Leland Ludcke. Cruz. entire class raised their hands. PROFESSOR : "Good ! You are the very TWO WAYS AT ONCE class I wish to speak to ; there is no 6th AN OILY WORKER chapter. " -Joseph Milota. MOTHER: (searching in drawer) "I can't INQUISITIVE PERSON (to boy pouring kero- find a single pin anywhere. Where do they sene oil on a wiggler -infested pond) : "And NOT A DENTAL COLLEGE all go anyhow ?" what are you doing, lad ?" LADY (to former Cadet of West Point) : SON : "It's hard to tell, because they are LAD: "Ah, just pouring oil on troubled "And don't you think the drills are awful pointed in one direction and headed in an- waters. " -Joseph Elles. boring ?"-J. F. Harvey. other." -Jack D. Purves, Rep. No. 25765.

www.americanradiohistory.com 1133 Science and Invention for April, 1926

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

PROBLEM dent are gently tapped with a lead or a wood faced PHYSICS LOCOMOTIVE HISTORY mallet, the dent will usually be found to spring (2023) Q. 1. C. C. Flanders, Des Plaines, Ill., (2019) Q. 1. Francis P. Otery, Philadelphia, out and leave the tank quite smooth. Sometimes refers to Scientific Problems And Puzzles article Penna., asks for some information on the history a strip of heavy tin can be soldered to the center appearing in the October, 1925, issue of SCIENCE and by pulling on it the plan, c ^n be AND INVENTION Magazine and refers specifically of locomotives. not de- of the dent, from his letter, A. 1. The original locomotive was straightened out. to Fig. 7 of that article. Quoting on rails such as we know "You say the motor rotates at a constant speed. signed for operation fore- re- today,' but really might be as the The only effects that I can see would be to runner of the automobile inasmuchnasmuch as it was de- duce the load on the motor by shortening the signed to run on common roads. The first record string or increase the load by making the string found of the application of a locomotive to rails longer. The statement regarding constant speed Richard Trevitheck who, in course prevents us from figuring that the gives that honor to first of 1804 in England, is said to have used the machine speeds up or slows down, and, therefore, locomotive in existence. This engine, however, the only thing that I can see is that the load on is said to have made only one or two trips and the motor changes. Am I correct ?" was commercially a sad failure. In 1811, a loco- A. 1. Your query has been forwarded to the au- motive was .built in England by Mathew Murray thor of the article mentioned, Ernest K. Chapin, which operated by a toothed wheel engaging with a and his reply is given here. toothed rail. Some histories credit George Stephen- "To make certain that no mistake has been son with the invention of the locomotive but our made in this solution I set up the apparatus as records show that his first practical engine was illustrated and found that the ball behaved as I completed in 1814. predicted. That is, the ball speeded up as its Prior to 1830, several locomotives had been in Bt radius of gyration was shortened and the cord use in America but they were of English manu- actually wound up on the stem supporting the facture and had been imported from that country. 1 ball. That the load on the motor was altered I In the year 1830 a locomotive was designed by I do not doubt, but this was negligible so that I Adam Hall, built in New York City and operated considered that the rotor was turning at practically on the Baltimore and Ohio Railroad. This seems a constant rate. If I have not satisfied you in to be the first record available of an American this matter, let me hear from you again concern- built locomotive. ing it." TATOOING EXPLORING HIGH ALTITUDES I (2024) Q. 1. Everell Reed, Viola, Wis., asks (2020) Q. 1. Raymond Williams, Stanford. for some general information on'tatooing and how Conn., says that he has often read of scientific it is done. observations dealing with the intensity of cold and A. 1. The method of performing this work re- air conditions that have been found at heights as solves itself down to a mere puncturing of the great as 10 miles. He asks : How are such observa- skin and the introduction of some colored pigment when the highest airplane flight has The latter heal, the ink re- tions made A very interesting problem in relative speeds into the punctures. not even reached the eight mile mark? several ways maining under the skin and visible. Black India that you men- is that shown above. There are the pig- A. 1. The various observations of discussing or colored inks are usually employed as tion are sometimes made by fastening registering of approaching this problem and ments, the water soluble type being commonly instruments to captive balloons and allowing them it to a satisfactory conclusion and one of these used. to rise to the greatest possible heights. The in- methods is gone into in detail below. struments work automatically and ma, records RECTIFIER of the upper strata of such phases of the condition (2025) Q. 1. Ed. Jones, Fresno, Calif., asks of air as humidity, temperature, air pressure and SPEED pint size electrolytic used are not of the how much current a small light. Often the balloons Oklahoma, rectifier can pass and also asks for some general captive type, but are set free and allowed to rise (2022) Q. 1. Lester Morris, Hooker, rectifier. to the reduced atmos- hypothetical question regarding information on the same type of upward until they burst due presents a purely from A. 1. This small electrolytic rectifier cannot be pressure and the pressure of the gas within appearance of a luminous body traveling pheric balloon the speed twice that of depended upon to pass more than 1 ampere of them. The instruments carried by th space toward the earth at a be at least 154 by means of a person situated on the current. The electrodes should are equipped with small parachutes light. He asks: Will inches apart, although this distance is not critical. float gently to the earth, whereupon of the earth be able to see this body which they per- surface The aluminum plate goes to the positive of the they are recovered and their records made as it approaches? solution of borax is to be instruments are, of course, protected all factors out of the situation battery. A saturated manent. The A. 1. Leaving and assuming employed allowing any excess of the chemical to from injury by various methods. The different other than the body and the earth, in rectifier. used for observation work of speed of double that settle before the solution is placed the types of instruments that the body has a uniform as this nature are very small in dimensions and in of light, this question can be readily answered TESLA COIL some cases, it is necessary to -read the records follows by referring to the diagram given in these the aid of a microscope. By the body is traveling toward (2026) Q. 1. Frank Spencer, Dayton, Ohio, made by them with columns. Assume that how means of certain methods employed, it has been the earth along a line indicated by ABC and that asks for a standard circuit diagram showing elevations as much will the earth at a point C. Furthermore, possible h. it strike E. Points C as I 4 iles above the surf ace the teart assume that the observer is at point S and E can be considered as being so close together in calculations will O l0 that the resulting discrepancy Let have little bearing upon the actual result. points A and B and B and C be 186.000 miles apart. The same of course is true of AD and DE. Assuming this self -luminous body to be at point A, it will be two seconds after it reaches this point before the observer will see it in that loca- location. This is because of the fact that it will take the light two seconds to travel the dis- tance AE. In the meantime, however, the body has moved from A to B, consuming only one-half second of time, whereas the light has taken one second to travel this same distance. The light of the body when at B or its equivalent position D will take only one second to reach the point E T iT1 has passed from A to B in and since the body for connecting a Tesla one -half second, it isi obvious that it will be seen The circuit diagram at position B before it is seen at A. Therefore, coil is simple and is shown above. at least for the space shown, the body will appear outward into space to an observer to be traveling Tesla coil with the required ap- An excellent method of straightening out or from B to A, rather than from space toward to connect up a B and its apparent speed paratus. dents in a tank is shown above. the earth or from A to diagram in these columns be one -half that of light. Of course, it must A. 1. The circuit will round figures shows how this is accomplished. In this diagram, be realized that in this explanation Tl connect to the secondary REMOVING DENTS only are assumed. However, this has little bear- the terminals T and actual solution which will remain the of a transformer supplying from 5,000 to 20,000 (2021) 1. Edward Ross, Philadelphia, Pa., ing upon the volts. A condenser, C, is connected across or in can be removed from same even under careful calculations. There will wants to knowQ. how dents into this proposition parallel with these terminals and the primary of sides of an automobile gasoline tank. be other discrepancies entering coil. TC, and the spark gap, S, are con- the as the distance BE being different from that the Tesla A. 1. Probably the simplest method of accom- such nected in series with each other across this con- is to assumed in the proposition, which distance is DE. plishing this work rapidly and effectively not affected. denser in parallel therewith, as shown. The sec- tank from the automobile and fill it Here again, however, the final result is is connected to a spark remove the the entire problem is pure theory and ondary of the Tesla coil with water. Then connect a petcock screwed into Of .course, gap, S1, or to any other terminals that may be tank to a 'compressed air supply has no practical application but it is a good example the bottom of the problem. desired. Of 20 pounds pressure. If now the edges of the of an unusual physics

www.americanradiohistory.com 1134 Science and Invention for April, 1926 STICKING VALVES carbonate; 100 parts, by weight, of (2027) Q. 1. J. H. Baldwin, parts, sulphur; 0.5 BAUME SCALE Rochester, N. Y., by weight, of potassium chloride ; 0.5 parts, asks: What causes the valves, by (2031) Q. 1. Victor Townsley, Clayton, La., particularly the weight, of sodium chloride ; 0.4 parts, by exhaust valve, of a gasoline engine to stick open weight, of manganese chloride. asks us to show the relationship between the Baumé when the engine The materials are scale and the is in operation. heated for three -quarters of an hour to specific gravit scale as applied to A. 1. This is usually one hour, ascertaining the condition of y caused by either a warped at about 2,372 degrees F. The product gives a the electrolyte in a or faulty valve stem or a heavy deposit of carbon violet light. storage battery. that has collected on the stem as shown in the 2. One hundred parts, A. 1. The diagram given here will show how diagram here. When this by weight, of strontium the two compare. carbon deposit becomes carbonate ; 30 parts, by weight, The scale that we have shown quite heavy it stops the valve from moving of sulphur ; 2 is calibrated from 1.100 to 1.350 on the specific up and parts, by weight, of sodium carbonate ; down in the guide and therefore, of course, 0.5 parts, gravity side and these figures for specific gravity it by weight, of sodium chloride ; 0.2 parts, by weight, of manganese are included within a space of 10° to 40° Baume. sulphate. The method of This applies to the Baumé scale for liquids heavier treatment is the same as in the first ; -.1--r phorescence the phos- being deep yellow. SPECIE IC 3. Sixty parts, CARBON When the valves by weight, of strontium thio- BAUME GRAVITY in an internal sulphate; 12 parts, by weight, of a 0.5 per cent. +- DEPOSIT acidified alcoholic 10 combustion en- solution of bismuth nitrate ; 6 VALVE parts, by weight, of a 0.5 per cent. alcoholic gine tend to stick solution of uranium nitrate. The materials The relationship 1100 STEM and do not seat mixed, are between - dried, brought t h VALVE GUIDE gradually to a temperature e properly, t h e of 2,372 degrees F. and heated for about an Baumé scale for trouble may be hour. The phosphorescence is emerald green. liquids heavier 4. Twenty parts - 50 due to a carbon by weight, of calcium (burnt lime), oxide than water and 20 deposit on the free from iron ; 6 parts, by weight, of sulphur; 2 the specific grav- parts, by weight, of starch; 1 part, valve stem as by weight, of a ity scale is shown 0.5 per cent. solution of bismuth 1200 shown at the left nitrate; 0.15 parts, by weight, of potassium at the right For X or to a warped chloride ; 0.15 parts, by weight, of sodium chlor- instance, at point stem. The rem- ide. The materials are mixed, dried and heated x, a specific edy for the car- o 1,300 degrees C. (2,372° F.). The gravity 50 product of 1210 . 30 bon deposit is rives a violet light. is equivalent to scraping. To make these phosphorescent substances ef- fective, they are exposed approximately 1300 for a time to direct 25° Baumé. sunlight; or a mercury lamp may be used. Pow- erful incandescent gas light also does well, but requires more time of exposure. - 50 sticks. If this is the only cause for sticking, it 40 can be removed by scraping the valve stem free BURNS of the deposit. If, however, the stem is warped (2030) Q. 1. O. E. Bergstrom, Roseau, Minn., in the least, it is advisable to install a new valve. asks several queries regarding electrical burns. than water. There is another sca e of the same A. 1. We have referred your various queries naine for liquids lighter than water. WEATHER FORECASTING regarding the treatment of burns Medical to our Staff (2028)' Q. 1. Leonard Price, New York City, Expert, and his composite reply is BATTERY CHARGER asks: Can you give me given below: some information regard- (2032) Q. 1 Frank Wiesuski, ing the making of devices that will change color "The burns you have described is evidently a Oglesby, Ill. second to a third class burn and the says that he has a vibrating type of battery charger due to changes in atmospheric conditions? of best method designed to charge at 4 amperes. He asks: How A. 1. It is known that a leaf of blotting paper treatment is in the application of picric acid. This is slightly antiseptic and can I increase the charging rate to 6 amperes? or a strip of fabric made to change color accord- allays the pain A. 1. This is rather impractical inasmuch ing to the hygrometric state of the atmosphere incident to all these types of burns. as "Lately, medical men have had it would involve rebuilding the entire charger. has been employed for weather indications in a great deal of However, you may be able to increase the char- place of a barometer. The following success in excising the necrotic areas and then compound resorting to skin ging rate slightly by careful adjustment of the is recommended for this purpose: One part of grafts when necessary, although vibrator. Do this an grafting was only required in with ammeter in the circuit cobalt chloride, 75 parts of nickel oxide, 20 parts healing a few cases as the so that the exact change of the rate can be noted. of gelatin, and 200 parts of water. took place very readily after the necrotic tissue had been removed. Q. 2. The needle of my charger meter formerly A strip of calico, soaked in the following solu- did not return to zero when the current was tion, will "There is no reason why a Dakin irrigation appear green in dry weather, but when would turned off. Instead it returned only to the 1 am- moisture is present, the color disappears. not be effective, but it surely would be no pere mark. bent better than the old method I the needle slightly so that it water of using soap and would return to zero but then found that when Copper chloride 1 part or boracic acid. the charger was Gelatin "There is always operating, the needle only read 10 parts a danger of infection from a 3 amperes. Does this indicate that the batteri Water 100 parts severe burn and a great danger cation. of auto- intoxi- is charging at only 3 amperes? This, however, should be over in five A. 2. Undoubtedly it does. Possibly, however, The following is a method of making old -fash- to six days, but has occasionally there ioned weather glasses containing a .liquid that twice persisted for is something wrong with your ammeter and this period. A prompt epidermization pre- in any event, the cheap types of meters that are is supposed to cloud or solidify under certain vents absorption of a toxic furnished atmospheric conditions: during substance formed on the average battery charger are not the injury. An injection of digalen can as accurate as they might be. The ammeter read- be practiced and coffee or ings are often Camphor 2% drachms Water other stimulants given. as much as 25% inaccurate. Alcohol 11 drachms should be drunk freely to aid elimination. Morphine is occasionally given, SMOKE DISSIPATION Water 9 drachms shock, but in cases of Sal ammoniac 38 drachms care must be taken that the blood pressure (2033) is not further lowered. Q. 1. Edward J. Lake, Clatskanie, Ore, Saltpeter 38 drachms The main idea in pre- asks: Can chemicals be used for precipitating venting pain is to exclude air from the This, of the burn. solid material in coal or wood smoke? Dissolve the camphor in the alcohol and the course, means that dry dusting powders A. 1. salts in the water or oils are generally It would be practically impossible to and mix the solutions together. placed over the area of the obtain any results which Pour in test tubes, cover with wax after corking wound. At the same time, would be commercially interferes excluding the air valuable by the use of chemicals for separation and make a hole through the cork with a red -hot greatly with the plans of management of the solid material needle, or draw out the tube until only a very in accordance with antiseptic found in coal or wood smoke. precautions. We Static electricity excitation has been used to pre- small hole remains. It is said that when the cam- believe that picric acid dressings would be supe- cipitate phor appears soft and rior to a Dakins this solid material and excellent results powdery, and almost filling solution. have 'been obtained in this the tube, rain with south or southwest winds may "Sodium bicarbonate has been manner. In many fully, used success- cases the fine dust from the smoke contains val- be expected; when crystalline, north, northeast, and olive oil on thick muslin bandages is uable constituents, or northwest winds with fine weather may excellent. A mixture which are extracted. be ex- of linseed oil and lime - Q. 2. What pected; when a portion crystallizes on one water well shaken is often is used in gas masks for filtering side used by chemists for out the harmful ingredients of various poisonous of the tube, wind may be expected from that laboratory burns." gases? direction. Fine weather: The substance remains entirely at bottom A. 2. The composition through which air is of tube and the liquid perfectly breathed in gas masks clear. Coming rain: Substance will rise gradu- CORRESPONDENT is usually made up of some ally, liquid Science and kind of charcoal. That formed by the ignition of will be very clear, with a small amount REPORTER'S peach of the solid in motion. pits was used to a very great extent in the A coming storm or very Invention IDENTIFICATION gas masks issued high wind: Substance partly at top of tube, and to our army in the recent war. of a leaf -like form, Other substances are also used; new gases pre- liquid very heavy. These ef- "( V/j{(f1 sent new problems for fects are noticeable 24 hours before the change ! the mask- makers. THE HEARER OF M sets in. In winter: Generally the substance lies THIS CARD/-j,,.Ha,,rLlf/ Is AN AUTHORIZED CORRESPONDENT REPORTER higher in the tube. Snow or white frost: Sub- SCIENCE OF INK stance very white and small starlike and INVENTION MAGAZINE portions in THE PUBLISHERS OF SCIENCE AND INVENTION WILL (2034) Q. 1. J. Strothman, motion. Summer weather: The substance APPRECIATE Brooklyn, N. Y., will ANY COURTESY EXTENDED THEIR asks for a formula for a good grade of black ink lie quite low. The substance will lie closer to the REPRESENTATIVE. and tube on the opposite side also requests directions for making the same to the quarter from EX RIMENTER P l:IS .co. heavier or lighter, according to the which the storm is coming. The instrument is use to which nothing more it is to be put. than a scientific toy and is abso- A. 1. lutely not to be relied upon. Try a formula such as the following, in- creasing the alcohol content, if necessary, to pro- ORDER duce a thinner ink. The formula is: LUMINOUS MATERIALS IN to present to the public the Nigrosin very latest scientific details, SCIENCE AND 3 parts (2029) Q. 1. Raymundo INVENTION maintains Water ... 15 parts de Souza Santos, a large staff of field Alcohol Philadelphia, Pa., asks: Can you give several reporters. Any one of our readers is eligible 15 parts formulas for the preparation of luminous materi- to ,loin this staff and, upon request, a re- Glycerine 70 parts als that can porter's card be used for experimental purposes? will be forwarded, together It will be necessary to thin this mixture A. 1. The illuminating power of the phosphor- with complete instructions for gathering and you escent masses material. The reporter's should experiment with water and alcohol until obtained by heating strontium car- card is illustrated the desired result is obtained. bonate or barium carbonate to a white heat with above, and its use will gain admittance sulphur is considerably to many places that would otherwise be increased by the addition, closed before heating, of small quantities of the nitrates to the ordinary person. You need not DIAMONDS of uranium, bismuth have any special ability to obtain one of (2035) Q. or thorium. Added to the these cards I. J. K. Waterbury, Woodland, calcium formula, other than a desire to help Idaho, : these nitrates do not heighten others asks What is the size of the largest dia- the luminosity or phosphorescence. The product to gain knowledge. mond that has ever been mined? from strontium sulphide is Address Field Editor, SCIENCE AND IN- A. 1. The largest stone of more luminous than _ VENTION. this nature of which that of the barium compound. Among the best f we have any record is the so- called Cullinan dia- luminous paints are Submitted manuscripts cannot be returned mond mined in South Africa the following: unless accompanied by postage. in 1905. It was 1. One 'hundred parts, by weight, of strontium about as large as an average sized man's fist and ì,». uw, num, uwwnn°nniuwuu,,, wuu°° uuwwu °uw,,, i,am,uuuw°uw,mw,u°mi weighed a pound and a half.

www.americanradiohistory.com 1135 .April, Science and Invention for 1926

"Your radio is always top notch. 1/1/hat do you do to keep it so full of pep?" or 2 Eveready your "B" batteries full of pep, without instead of 2 Eveready No. 770's KEEPING at first glance like an frequent renewals, is simply a matter of using the Layerbilts No. 486 -looks Evereadys for your particular set with economy because of lower first cost. But in a few right size be battery *. months the 772's will be exhausted and have to a "C" the Ever- determines the right size "B" replaced. After the same length of time The rule which Layerbilts No. 486 to use is so simple no one can make a mis- eady No. 770's or the Eveready batteries many more months of service. take, and once learned it definitely settles the ques- will still be good for tion of "B" battery service and economy. We have prepared for your individual use a new Use Eveready No. 772. booklet, "Choosing and Using the Right Radio On 1 to 3 tubes - you upon tubes Use the Heavy Duty Batteries," which we will be glad to send On 4 or more - about the proper "B" Batteries, either No. 770, or the even request. This booklet also tells Eveready battery equipment for use longer -lived the new power tubes. Layerbilt No. 486. with *NoTE : In addition to the increased On all but single tube sets Lar T No. 486, life which an Eveready "C" Bat- for 4, 5 or more batteries, it -Use a "C" battery. tub es. $5.50. tery gives to your "B" will add a quality of reception without it. When following these RIGHT - Ever- unobtainable 1 to 3 eady Dry Cell Manufactured and guaranteed by rules, No. 772, on Radio "A" Bat- tube sets, will last for a year tery, PA volts. NATIONAL CARBON CO., Inc. more, and Heavy Duties New York San Francisco or Canadian National Carbon Co., Limited on sets of 4 or more tubes, Toronto, Ontario for 8 months or longer. Tuesday night means Eveready Hour -9 P. M., Eastern Standard Time, through the following stations: These life figures are WEAr-NOW York wsAICincinnati wJAR Providence wEAR Cleveland based on the established fact wEEr Boston wwj Detroit -round EfilEAIY WTAG- WoreeSter woN Chicago that the average year wFI Philadelphia woe Davenport is 2 hours a day. won Buffalo wcco 1 Minneapolis use of a set wcaa Pittsburgh 1St. Paul Radio Batteries aspSt. Louis A pair of Eveready No. -they last longer Pacific Coast, Eveready Program, xco-San Francisco, 8 to 9 P. M. 772's for a 5 -tube set

www.americanradiohistory.com 113b Science and Invention for April, 1926

Tarrano the Conqueror WARNING! By RAY CUMMINGS (Continued from page 1105) You cant become an He persisted; but his voice was gentle That is not so. A slight setback. A strate- and earnest. "Soon we will be at my gic retreat -and in a week I will have re- home, Lady Elza. And now -there are gained more than I rice have lost. . Oh, some things I would like to say while I Lady Elza ! I who would now -and always have the opportunity. . . You will listen ?" -be so gentle with you -why we are almost "Yes," she said ; and tried to keep from quarreling! That is not right. For the him the trembling within her. "I'll listen, lives of a thousand of my servants, I would of course." not have used that tone to you just now. EXPe He nodded. . . without thisrit "Thank you. My Forgive me. . . . Elza, you have heard me talk of conquer- I was saying, my Elza -could not you thorough ing the world. My dream -my destiny. It feel more kindly to me now. A little hope training will come to pass, of course. Yet -" A from those gentle eyes of yours -a little smile pulled at his lips. "Do you know, word from those red lips -a word of hope my Elza, what you and I are doing now ?" for what some day might be for us -you She stared, and he did not wait for her and me-" to answer. She dared to try and turn the subject. "We're making my first retreat. I won- "You mentioned the Brende model -where der if you can realize how I feel, having is it? Have you it in the Cold Country ?" to admit that? Tarrano in retreat! . . . He frowned. "Yes. And I will I have trained 16,000 men in my big use it- schools. And I know how long it will take Our escape from Venia? Pouf ! That was for you and me alone. You've always you to become an electrical expert. a jest. I was there on Earth merely to get known that, haven't you? Just for you and I know what every electrical school in you, and the Brende model. I had no ne, my Elza." He took her hand. "Won't America offers its students. And I have proved that my way of teaching electricity thought of conquering the Earth just then. you try and love me -just a trifle? Is it is the right way! I accomplished my two purposes -and left really so hard ?" I dont promise you a big -pay electrical . It was . not a retreat, merely a She did not move. "I -don't know." job 30 days after you enroll for my course. planned departure. Then she faced But him squarely. "I do not - "But this, my Elza, is very different. I love you, Tarrano." Something in his eyes No matter what proposition any did not wish to do what I am doing now. quality of pleading; a other electrical school offers you -a wistful smile I'll guarantee to give you more and I had planned -I had thought, had actually upon his lips -suddenly struck her as pa- better training for the same .hoped, that I might maintain myself in the thetic. Strange and queerly pathetic that money! Great City. You see, I tell you this, little such a man as he should be reduced to wist- I wouldn't dare print such a guarantee girl, because -well I am a lonely man. I fullness. Emotion swept her. Not love. A unless I could back it up. But everybody walk alone-and because I am human -it feeling of sympathy; a womanly desire to knows that National's Electrical Course is the most thorough of its kind. Famous in- does me good to have someone to talk to. lighten his sorrow; to sympathize and yet structors train you. You use as few books I had hoped I might maintain myself in to withhold from him the happiness he as possible. Work right with the instructors the Great City. Last night -at the start sought. on a half - million dollars worth of new elec- trical equipment. Learn by doing. of the Water Festival -I began to realize "I do not love you, Tarrano. But I do it was impossible. I should have enlisted respect you. And I am sorry -" I Help You All the Rhaals -the men of Science, Elza. But "Respect! I have told you I can corn - Through Your Life! I had no time, and they are very aloof. I mand that from everyone. But love -your When you enroll for my course you are could have won them to me had I tried." love -" entitled to stay in this big school all your He shrugged. "I must confess I was "I would give it if I could, life. You can take part of my course -for Tarrano." many of my de artments are as complete as over -confident of my strength -the strength "You mean -you're trying to love me- some schools' full courses) -and come back of my position. The Rhaals stayed out of and cannot ?" years later to take the rest, at no extra cost. the affair -stayed in own city, "I mean -Oh, I don't I don't rush you through half- trained. Na- their which know what I mean, tional stands behind you all through your has always been their policy. That was save that I do not love you yet." life to help you to learn more and earn more. what I expected, but now I see I should He smiled. "I you When you train at National you are right think speak the truth in the heart of California's tremendous hy- have had their aid. I did -well what I when you say you do not know what you dro- electric development. Hundreds of big - did to guard against the unhappy outcome mean. Your love! If I had it, I should pay jobs now open right here. you witnessed -whit I did was wrongly know that I would have it always. But- With National Training You planned. You see, I take all the blame. I having it not -" He was very sincere, but Know MORE than Other Men alone am responsible for my destiny. There his smile broadened. "Having it not, my How can you hope to be a foreman or are some who in defeat cry bitterly, `Luck! Elza, there is no power in all the Heavens superintendent or hold any other big - cursed luck that can tell me salaried electrical- job -unless you know That was against me!' Not how to get it. It may more than the other men? National- trained so ! Leadership is not a matter of luck. be born in a moment from now-or never. men do know morel -And I'll help you land Destiny is what you make it. You see? Who can tell ?" a real job at real pay! "And so now I am making my first re- She was silent; and after a moment, he My Free Book Tells the Truth treat. A set -back, nothing more. I shall added; "Enough of this. I would ask you Dont be misled by promises. Get my free launch my forces from the of Ice, just one You book of facts. It tells the Truth about the City thing. are not afraid of me, electrical industry. Learn about by sensa- instead of marshalling them from the Cen- are you ?" tional Lifetime Scholarship -the greatest tral State as I had planned. And Mars is "No," she said; and at that moment she proposition ever offered any man who seri- ously wants to learn electricity right and still mine. I still control Mars, little meant it. earn real money. Every statement I make Elza. . . . A set -back just now- and it "I would not have you ever be afraid, here is backed by 21 years' experience bothers me. It hurts my pride-and as you Lady Elza. Love is not conceived by fear. teaching men like you. I guarantee my train- ing. And if you want to be a real Electrical know, my Elza, Tarrano is very proud." And you must know I could never force Expert instead of a "half -baked dub" you'll She had been listening to him, her fin- my love upon you. For if I did should mail this coupon for my free book and learn -I the facts before you decide. gers plucking idly at her robe. He bent withhold forever the birth of this love of closer to her ; his voice turned tender. "I yours which is all I seek -this love I am was thinking that perhaps -just perhaps trying to breathe into life. . . Enough!" you would scorn Tarrano in his triumphs, He did not mention the subject again. NATIONAL you might feel differently toward him now- For hours-eating what meager stock of in his first retreat. Do you ?" tabloid food with which their vehicle was Electrical School She forced her eyes up to his again. "I'm provisioned - they flew onward. Rising Dept. 553, 4004 So. Figueroa St., -sorry -from your viewpoint, I mean- now to top the line of jagged mountains. that things are going wrong." Over them the platform swept. In the Los Angeles, California He smiled gently. "You are very con- crisp air the snow down there gleamed blue - servative, Lady Elza. You want very much white; the ice with an age -old look filled I want to know how to make BIG hypocrisy, you MONEY in Electrical Work. Send your to avoid don't ?" the valleys between the peaks. FREE book. "Yes," she said frankly. "You could The arctic ! It was nothing like the Polar hardly expect me to be sorry at your de- regions of Earth. Stark desolation. A Name feat." naked land seemingly upheaved by some Address "Defeat ?" He rasped out the word, and gigantic cataclysm of nature, lying tum- too opti- bled and broken where it had - fallen in con - City State his laugh was harsh. "You are a mistic. Defeat? Things going wrong? (Continued on page 1138)

www.americanradiohistory.com 1137 Science and Invention for Aprili1926

STAGE Withabuneb BLANK CARTRIDGE PISTOL MONEY L isieasy lfor This well ,__, r Price each ma de limited eetici Pistol i t $100 Make Your Watches, Clocks, Etc., means to modelled The cry latest discovery in the appear the pattern world. Hitherto, prac- Visible by Night scientific have at last prosperous the latest tically unobtainable except at an exorbitant a ftofow Re- LUMINOUS PAINT, which, applied to by flashing Post- succeeded in producing this remarkable it perfectly visible a roll of volver, the rays of white light. rendering 1 the surface of any article, emits IT . Quite bills paid in the dark. THE DARKER THE NIGHT, THE MORE BRILLIANT of your these opPearancef which to use. Anyone -you do it. A little applied to the dial the alone is simple the time by night. You can coat the push at a whilst, when watch or clock will enable yon to tell and innumerable proper enough to scare burglar, buttons or switch plates of your electric lights, match boxes, etc. a genuine bili loaded, it will probably prove just as mCrucifixes, Luminous Rosaries, and oft with re_ 1 bul- other articles : make your own Luminous 25o. Larger time peeling effective as a revolver Bottle containing sufficient to coat rat 11 articles, Price or two from the outside of the roll, lets, without the danger to life. It and SI postpaid. Johnson Smith á Cos Dept. 342 ,Racine, W is. will be found to takes the standard .22 Calibre Blank sines 50e the effect created Cartridges, that are obtainable most be desed. everywhere. Even the t timid pos tpaid:40tBHis 200 120 for i50e, safety and frighten a thief with- Typewriter can a it with perfect Protection Against The "Little Giant" or 53.50 thousand postpaid. outrisk or anyone else. A Great with- A First Class Writing Ma ggers, Tramps and Dogs- You can have it lying about attached to. other revolvers. Jr". ell lards aunt- For $1.51) X- Ray out the danger sol Metal Machine Wonderful b d t h e 4th t July Well made of ahipPne by A perfect little typewriter for 11,60, ONLY 51.00 Postpaid. Blank Cartridges 22eal.. There are thousand. pereons ho pro- PRICE Smith á Co.. Dept. 342 ,Rae Wish would like to use a typewnter, butt instrument Promprase only, 50e per 100. Johnson needs and do not war. ducing optical whose X711-AY Skeleton rant the expense attached to the pun. illusions both Powder Mystic dsela and use of a fifty or seventy -five surprising a n d Sneezing A jointed figure1oC pd. dollar machine. To such pereons we startling. With it ,x Place a vary of skeleton is recommend our Litds lip the, bones of a llamount o eighten will y made, you can ne what is apparently this pow- dance to music GnfiLiant Ili, the lied in lead pencil. the in- f netlu to 8o that anyone esn roue angers, and many other der and perform vari- as learn and write terior opening in a pipe stem, back your ous gyration. ep illosmne, A myste that no one hag aand _. as repidly they wouldd with pen miler plate. Prise &Os. hand ta hile and ink- Th, letters f the alphabet been able to anti,/ aetor,JY i h ow it into the doyen 75s. Johnson Smith & Ce. operator mie pu are so [reaped W enable one to write rapidly, the numernd 3 lor25e,1 the bee diatom. Mat frequently machine you con mend in 1 sad the punctuation marks bean[ together. With this from it. / +. 1 envelopes, make out bills, end do since 3aky r the room or your beet Eype.warren love letters, address eaoh typewrite. r1 rd loll ler¡e, e=penewf machine. wnh. carwill begin any kind of a not vein[ the Come Good the reason Eggs we Bend a tabs of ink and full panted metruccione for mashing, Price to ,neede without knowing Serpent's 51.50 by maD postpaid Lamy address in tic wor10. why. It is most amusing to hear their re- Box contains 12 eggs. When Baste Luck vex eepect the real each marks, as they one lit with a match, urce but think they have caught it gradually hat -lies Own Toy Maker Ring arm t the other. Between the laughing ,,elf Every Boy His d meeting you yourself will be having n glee boys' book Quaint the t ne of your life. For parties, Simile- rngl Greatest and Novel eel i.:din ear rides, or any place at written. Tells how to all where there in a of people while Cam- Design joke set. Pricy lik.or 3 i a moot life- make a Pinhole k is them -mime urts and twists about 10c era a Canoe model OM lac like manner. Price lose box ppd. Railroad, a Telephone, A VERY striking and uncommon ring. Silver and eroeehone design, Boomerang, Telegraph GOLD TH finish, skull .parkling ut of the Button Box Kite, You know how fashionable it brilliant, flaehint lems to the Microphone Transmitter Instrument, Is to have gold crowns-ifs u eyes. by many to brin` Good Luck said name, Geod Lusk Rissg. Talkin Machine, can afford it. These gold- finieled erer, hence its in p Electric fasten over your real teeth very unwne rios that will tike a pride 1M)oorBell Water Wheel, aa and look like very wealth ;airing ONLY 25 CENTS. a pair of Skis, a Dog Sled fillings. Can be slipped on sad Raft, 64 o0 in an instant. Get some and Bird House, Rabbit Yard, etc. surprise your friends. PRICE Exploding Cigarettes pages. 150 illustrations. PRICE, or lOc postpaid; 3 for 25e. 50n for Idortipostvald & CO., Dept. 342 , Racine, WIS. IOHNSON SMITH It goes with real Yankee U. Se BABY TANK Pep -by its own power Most remarkable Toy ever m- make a highly wr eitivs d teetottlmee by inted. By drawing the Tank Ton can easily sound waves. backward, ether with the using this Transmitter Button to collect the 25 ?:- or You can build your own outfit without buying et-Pensive hand or over the floor table andd inexpensive. You c m ioetan Cents o7m and then placing it down, it equipment. It is simpl held all r' outfit in your home and conversations being `.., 1 ,tors, rvercommg an up different rooms of a in the same life- overr the home. You can connect r%Gr//r'/iï/ Ìl11obstacles= This outfit was used by secret service lopes! Ives due.' like a as the larger ORDINARY CIGARETTES. used on the state. It in ohm-sapid- Tank that proved no dead yi in JUST LIKE ing the war. It is being e2.iiIIÍ makes BUT SUCH REAL STARTLERS! The box See and is the sreatest invention in micro- Phones. You can the gr t war. What contains ten genuine cigarettes of excellent button almost anywhere -card board boxes, stove t't go somewhat of a mys- when naoh mount the picture frame, cte. é there is no mechan- ulity. Thy appear eo reeI, but pipes, stiff ealendare, on the wall behind a ,iiÍll!lilir - ery, for garotte ieabout ono-thied smoked, the victim le so light and small it cannot be detected. Persooa ' ism to wind m s is usually é off with o Button listen in on understood with mechanical very great surprise us a gone cann be overheard without suspecting it. You can the rote' yet in another room. A deaf person in the audience toys yet this tank will keep plodding along entirely harmless. Pelee 25o pera boas. hear the meeker. Convected to honograph, piano or mosegi ctet times logerstunts; n gooe in and can of e1 ff¿medd at 11 perform nches only 2S cents it ill ,her musical instrument an be heard hundreds Srifdozenlong. Price feet sway. Button may be used to renew telephone trans- Popular Watch Charms mitter.: often makes an old line talk -upw when nothing will. The ideal microphone for radio um: carries heavy I else radio signal.. Countlem other similar I BOYS ! BOYS current and is extremely sensitive. Amplifies hundreds of BOYS will suggest themselves. Experimenters find th useful uses Bus u .. xperiments along the lines of telephones. amplifiers, s tt o or I5c be devised, such ne holding the button against the throat chest natro. stunts may ie to anyone who send. in a to reproduce speech without sound waves. 55.00 given YOUR VOICE for of the Button and it suitable THROW siew POSTPAIDANYWHERE.rs Into a trunk, under the ONLY for use ins their iterature.a PRICE 51.00 8 dot. bed or anywhere. Lots of for 404 51.86 ANARCHIST BOMBS INK One of these INVISIBLE fun fooling the teacher, Very pretty little curiosities and decidedly The most novel. Fitted with Magnifying Lenses that glass vials messages c, be writ- policeman or friends. enlarge the pictures to a very ear r ce degree; dropped in a ten with Ink,InE, for in fact, it menu almost incredible that a clear room full of MAKES Ne picture could be possible in such a smolt nom - MARK. Cannotnot Jot seen and sharp distinct they show Un people will lt. you know the se- THE VENTRILO when youh w assorted cause more con- eras. In. for men lows -Actresses, via of Panama sternation than a reasons. Keep your poet a little instrument, fits in the Lord's Prayer in type. eta. cheese. ale and other private mem- limburger randn a away from prying mouth out of sight, used with The smell en- eyes. Greet fun for playing MAKER tirely disappears in a short time. practleel jokes. Opp SSe Bet1 above for Bird Calls, etc. Any- CIGARETTE 10e a Box, 3 Boxes for 25e one can use it. ITCHING POWDEK Never Fails. A 32 -page book on ventriloquism, This is another good practical joke; the intense FOR 10c postpaid. discomfiture of your victims to everyone but and the Ventrilc, ALL themselves is thoroughly enjoyable. All that start the ball rolling is to de- is necessary to band , on a persons BIBLE your own and a oney. Makes posit a little of the powder MIDCET Boll besides liming can be relied upon to do the CURIOSITY them better and quicker ore and the powder GREAT than half. Use your favorite ° rest. The result is a vigorous scratch, then Smallest Bible in the world. Size of a useful and handy. PocketeeÌ more. Said to tobacco. Neat, entirely of metal, some more scratch, and still some postage stamp. 200 Pages. size, weighs M o doz boxes postpaid. bring good luck to the owner. A gen- ookel- plated. Price 25o postpaid. 10G box, 3 boxes for 23e or 75c per uine work of art. Must be seen to be appreciated. Make good money selling FLUTE Wonderful Instru- them to friends, church acquaintances, MAGIC 350t k ment. Greatest thing PRICE 15G each, 3 for 40e, 12 Toned and Musical LOOK yet. Nine sep- etc. Also obtainable in Leather Binding, Wonderfully Sweet 00 in for $1.35, 100 for $7.50. doz. arate articles ith gold edges. Price 50. each, 3 for $1.25, $4.50 per The Magio Mute. or Humeur one. Everybody Mawnifying Glass for use with Midget Bible. 15e atone, e i unique and delighted with it. ieaÌ tmtrument that v Odd. curious and played with noes sea m1onth interesting. Lots comb l ttld knack in playing of pleasure as well as t which, when ce 3 very useiul. It is a double red after a little prim- the wonders Ku Klux Klan told in a will enable you to Or Microscope for examining about the +..)1 we ,, Everything Post It is also an Opera Glass. fearless manner. Book tells all How it Produce $100 of nature. Tele- clear, suppressed in 1871 -The New KU Paid ilseeyeweetthet a Stereoscope, a Burning Lens, a Reading Glass, a started and was There a a Pocket Mirror, and a Laryngoscope 25c 4 rn%sembeles tared scope, Compass, the cost d o y b flute. ear, nose and throat. It is worth all enrolleddlanOatb of torganized-HowQeions for Can- o angering. -for examining eye, flat and fits the of the Order -Obedience it a ran went even one painful cinder in the eye. Folds didates--Creed-Objects Whemlplayeedm as annnceompae to locate by of Loyalty Klux Kiat: d mosleul instrument. -Fidelity- Pledge -Ku ton pine oe a other pocket. or for $1.00 postpaid. Jews -The Masons -Real am ae tie ,ueprldai. Price, only35e 3 and the Masons -The etc. meat the 'fleet a charming C. Negro Klux T e N u l Klßn, et.c,, . Lttpostpaid. PLANT K f Oath Novelty Badges RESURRECTIONOne of the most wonderful Mate plants known. Possesses the Female 1. SEX INDICATOR of turning in a SEX T Hold the MAGIC INDICATOR strange power Indicator over a man's hand -instantly it few minutes from an appar- î ¡ to ,` straight line, back- ently lifeless, dry herb a 25c / -+' ward and forward. Hold it over -r = BEAUTIFUL LIVING FERN- _ hand and it describes LIKE PLANT (ii, _ /N. complete and continuous circle. the plant f1 The a let action can be obtained of a dark green color. Simply place over a letter attle a men ut and start to grow out in saucer of water, it will open up woman, etc. It is fascinating: baffling. We have never been able fig-me taken out i t will dry up and never Inds it fail. Many novel and entertainingresu is feat. in 20 minutes. When how but we've near can be e-.sinv Perme toe darter Impactor ta placed in water again. Fine house the Sex Indicator. Fore bins, results m motel to sleepp ntil maybebe Cewithperformed withills chickens,etc., etc. Two very novel metall bade go 1 cents each aobtained with cats, over birds, n e wing you fun Splant-summer or winter. 0 the sex chicken,chickens and birds,birds etc., Sin tact it it Bold as plated.thatyou used to predetermine 3 their $ for 25e tester in Europe. Price 25e, or for m o r a wtanted egg . 1Öofallhptidge,3each badge,e for 20 or Per postpaid. AgentS Wanted dos. DeLu+e Edition of ear nom I925CA TALOG ON THIS PAGE TO Postage mailedl on ADDRESS. ORDERS FOR ALL GOODS Stamps book its kind 520 co of Only f novel- all the latest tricks in map, the newest AcceP" title puzzles, pewee. eyorbnnp goods, rest - DEPT. 342, RACINE, WIS. books. curiosities m..aa and plantssmt etc SMITH & CO. Wl le ee JOHNSON

www.americanradiohistory.com 1138 Science and Invention for Bpril, 1926

Tarrano the Conqueror '"gIIIINIIIIiIIiIIIIIIIIIIIIIIIIIIIIIIIIIIIfiN11111111111@'IiIIIIIiIIIIIIIIIIIIIIVIIIIIUiIHIIUIIIIINIIIIIIEIIIaiBIIlBili (Continued from page 1136) -

vulsive agony ; and then congealed forever in a grip of ice. The Sun hung level as the vehicle ad- vanced. In these latitudes it would swing sidewise in a slow, low arc, to dip again below the horizon and vanish. Here in the Cold Country it was morning of the Long E Day. Summer 1 On over the crags and glaciers Tarrano guided their frail flying platform. 16 inch x 8 foot Houses Quick Change Gear , s occasionally showed now-huts of ice, con- Screw Cutting Lathe "I ul wish gealed IIIIIII!NIIIRIIIHIN we had dwellings, blue -white in the flat Our Imo Putt llllillhlllllllllfhlllÍnuIIIIBIIIIII!!IIí0111lllllllllllll sunlight. more men like him' And then at last, over the horizon came INew Lathe tile ramparts of a city. The City of Ice. "I'VE given him two promotions in The size of it-the evidences of civiliza- Catalog Free! the last year and he's made good tion here in this brittle land of deadly cold Shows 96 styles and sizes from each time. the smallest Bench Lathe to -made Elza gasp with wonderment. the largest Factory Production "I always feel safe in moving him up Lathe. Describes - because I know that he's preparing CHAPTER XXIV The himself handle New South Bend Lathe to bigger work. THE ATTACK ON THE PALACE a heavier, stronger Latheofgreater beltpow- "The er -equal in accuracy and precision any International Correspondence I must take you to Schools keep me advised of the prog- back now to the Water other Lathe made. The New South Bend Festival and the events in the Great City Lathe sells at attractive prices -each one a ress he is making and I've encouraged remarkable value. Write for Free Catalog. him which followed it. Slaans in murderous Easy Payments if Desired to keep on. His spare -time study- frenzy ing certainly has made him a valuable were plunging through the throng South Bend Lathe Works man to this firm." of erstwhile revelers. Maida could not 505 East Madison St., South Bend, Ind. quell them. The revolt which she had flllilllllUIIIBIIdIIIlnImmIINHIIIIIIIIIIYllllilllllllllllll1111111111111116! started ,) IIIII' 1111111111118111NItl11111111111Bllmll Why don't you study and get ready for promotion against Tarrano seemed now a self - too? We'll be glad to help you if you will only created monster to destroy us all. make the start. And the way to do that is easy. But there were Earth -men among us. A Choose the work you like best in the coupon be- low; then mark and mail it to the International hundred of them, no more. They had Correspondence Schools today. This doesn't obligate come from Washington that same day ; had you in the least, but it will bring you information landed, I learned later, secretly near that will help to start you on a successful career. the This is your opportunity. Don't let it slip by. Great City, sent with our Earth -Council's plans to communicate with Maida. Be- Mail the Coupon for Free Booklet 7(1 neath the water, coming individually, they had entered the INTERNATIONAL CORRESPONDENCE SCHOOLS 'festival; and helping Box 6237 -D, Scranton, Penna. Maida's girls (the diving girls whom I had We Teach Oldest and largest eonreaponaelw.e acaools in the world encountered) they had made away Without cost, please tell me how I can qualify for the with ART position or in the subject before which I have marked an X: most of Tarranó s guards. COMMERCIAL BUSINESS TRAINING COURSES In those first moments Meyer Both Company, maintaining the Business Management Salesmanship of frenzy, I got most widely known Commercial Art Industrial Management Advertising to the balcony-joined Maida and Georg. Studios in World, Personnel Organization, Better Letters the offers you a practical Traffic Management Show Card Lettering Elza was gone! My heart went cold, but training based upon 25 years' success in produc- Business Law al Stenography and Typing in those hurried, frantic moments, grave ing over a quarter million drawings for leading Banking and Banking Law Business English advertisers. This attractive profession equally Accountancy (including C.P.A.) OCivil Service disaster as it was, I did not dwell upon it. Nicholson Cost Accounting Railway Mall Clerk must open to men and women. Home study in- Bookkeeping Common School Subjects "We get away -back to the pal- struction. Private Secretary High School Subjects ace!" Georg exclaimed as I joined them. Spanish ['French Illustrating The Earth -men Get Facts Before You Enroll in Any School TECHNICAL AND INDUSTRIAL COURSES on the main floor were Electrical Engineering Architect holding the Slaans partially in check. Send 4c in stamps for illustrated book Electric Lighting Architects' Blueprints Bodies were telling of the success of our students. Mechanical Engineer Contractor and Builder lying in a welter- I shall not I Mechanical Draftsman Architectural Draftsman. describe it. Then abruptly, upon a table a Machine Shop Practice Concrete Builder huge MEYER BOTH COMPANY Railroad Positions Structural Engineer Slaan leaped -his garments blood- 64 Gas Engine Operating Chemistry O Pharmacy stained from his victims, a blade of Dept. Civil Engineer Automobile Work drip- Michigan Ave. at 20th St Surveying and Mapping Airplane Engines ping steel in his hands. He shouted above Metallurgy D Mining Agriculture and Poultry CHICAGO, ILL Steam Engineering Q Radio Mathematics the tumult -words not in the Universal lan- guage, but in the dialect of the Slaans. His Name command carried throughout the building. Street 6.26 -25 Address Other slaans took it up ; we could hear it echoed outside as others shouted it over LATES *''COAST TO COAST" FULLY GUARANTEED City Stato the waters. D 'S -10 DAYS FREE Occupation The bloodshed abruptly ceased. The AWE you reside in Canada, send this coupon to the Users everywhe.a report Radios gert If Interna- slaans leaped away from the Earth -men, programs coast to coast on loud speaker, tional Correspondence Schools Canadian Limited. Montreal outperform to three times se costly. who were glad enough to let ay hear foreign countries. Radio e them go- amazin valu in conditionally rushed for the archways gostuaranteed, actory -builtlong distance of the pavilion. Bete -let testimonyfes of were convince you. Outside, we could hear the water splash - PowerfuINewMuIi. tube N iraco gets ing. Swimmers -and boats scurrying long distance on off. -AIRACQ loud speaker. Set, $ 35 Then comparative silence. The ONLY . . , scream of RADIO icW,J Write secret letters with invisible ink; a slaan woman in the grove nearby, still FREE! m wstañémod- GETS'EM ele, new low á pour blue, brown and black liquid from prices testimony of AGENT a glass of water; make a magic pitcher desiring vengeance ; the groans of the dying COAST 1'o users and S.M.. OFFae. write: USERS of bluing; make your own magic writ- at our feet ; the hiss and splutter wea- COAST MIDWEST RADIO CORP'N WANTED ing paper, your own ink and dyes. It's of Pioneer Builders of Sete Write for all easy if you have Chemcraft Junior - pons discarded, with circuits still connected. 409.W E.Sth St. Cincinnatl.O. discounts. the pocket Chemical outfit. Get yours And over it all, the now. Order right away and get a FREE great whine of a dan- Copy of The Boy's Handbook of Chem- ger whistle, which some distant official istry; 100 pages of experiments, formu- had plugged. . . 1lao. interesting chemical information, . A lull. And around BLACKHEADSECZEMA money - making v us lay strewn stark tragedy where a few Suggestions a is d BOTH / catalog of asp- moments before had been festive merry- piles. making. A crimson scene, PIMPLES 1EMCRAFT THE PORTER with the body CHEMICAL CO. of the Red Woman lying like a symbol in Your Skin Can Be Quickly Cleared of JUNIOR 107 Washington, its midst. . . . Pimples, CHEMICAL OUTFIT Hagerstown. Md. POSTPAID Blackheads, Acne Eruptions on 25 «..5 Within an hour we were back at the the face or body, Barbers Itch, Eczema, palace. The whole city was seething. Enlarged Pores and Oily or Shiny Skin. FREEwrite today for my FREE BOOKLET Insure your copy reaching you each month. Sub- Boats and lights were everywhere. Con- A CLEAe -TONG 8Km." telling how f scribe to SCIENCE & INVENTION -$2.50 a cured myself after being afflicted ió yearn. year. Experimenter Publishing Co., 53 Park PL, trol of everything seemed lost. Warning $1000 Cash says I can clear your skin 00th. above bIsmish.s. N. Y. C. (Continued on page 1143) E. S. GIVENS, 168 Chemical Bldg.. Kansas CIty.Mo

www.americanradiohistory.com 1139 Science and invention for Aprii, 19Gí, OWN" WITH "RASCO" PARTS! "BUILD YOUR House the United Buy from the OldestpandtOriginal Exclusive RadRadio Parts uRs Money refunded if Order direct NEW PRICES FOR APRIL goods do not satisfy from this page

Cushion 1_ Audio Transformer Audio Frequency Trans- Sponge- Rubber rs "Guaranteed" Marker Patent S.L.F. Condenser SLF Condense This is the famous Patent former Get rid of tube noise Dial SLF Lowest prices ever offered Vacuum Tubes The famous Pacent the Guar- Audloformer. Nickel case No better Transformer due to vibration. Sottes The big little thing you Condenser. T h e lates Despite this low price We consider to base. Ex- for. are made anteed" tube one of the is grounded made. Highest class ma- sponge rubber made. Size have been waiting word in condensers. Stur these condensers Any tra high degree of ampli - Impregnated coila. a hole in the take up les with precision aluminum best on the market. terials. Just drill dy. compact, hard rubber tube replaced if defective, lication. Minimum distor- Silicon steel stampings 2% "x3 ". %" thick. panel and mount the room than most others stampings, lights. tion and reaction. Bind- used. Save 50 per cent by dial. insulation used. Insulation. Money back .if providing filament lugs. A8989 Sponge- rubber marker above the Minimum Calibrated curve goes with ing posts and solder assembling it yourself. Nickel plated and polished A4432 00035 mf. 17- not satisfactory. Ittio 3% to 1. cushions, each $0.t2 plate $2.95 A3513 .00025 13 pl. $1.06 each tube. Mounted type 64.50i/11100 Ratio 4%-1 $1.40 17 Pl. 1.20 A70IA 5v. 0.25 amp. $1.25 A2811 Six for 0.60 A7788 Dial Marker. A4433 .0005 mf. 23- A3517 .00035 125 A2812 Unmounted ., 3.15 AI150 Matto 61/2-1 1.40 S 10 3.95 A3523 .0005 23 pl. 1.35 A799 3 volt, 06. amp. three for plate M ai4lY 1 1509 1507 stYi 1490 Q IY IIG Uli! r ' -_ '0°0l150a 1475 Cord Tip lack Brackets FONEKUSH ONS Dial Button Vaeuum Tube Shell IBrass Nickeled Universal Socket Rasco Vernier Takes place of binding Why use a vernier dial sponge rubber Made in blue enamel and Nickel plated shell for the All Illustrations t4 size. type Made of firmly Takes new "X" when a vernier attachment Make wearing your receiv in man who builds his own. Posts. Cord tip Bracket, each $.05 well as old stan- and ev- gold, to be worn but to aub- A1505 tubes as will do anything e. I holes to attach of ,05 rs a pleasure. Positive fat- gripped by lack. Made 1A1AI5:17 Bracket, each dard "LTV" and C" erything a vernier dial ly all noises and ton hole. Every radio uase. Each shell comes of exclude rass, nickel plated. Screw 509 Bracket, each .04 types. Made entirely accomplishes? make reception a pleas wants one. %" diameter, complete with 4 phosphor A1476 Bracket, each .0i lsolantíte.I No capacity Cleverest vernier made. ure. Sponge rubber wil to attach lead wire. No each 05 socket contacts. Bracket, effect between plate and be used with any hest gold. plate. Perfect bronze IA1506 Can Light a. 1 bronze Iasi for years. .see illus. 4748. soldering necessary. AI i; !tracker, each .64 grid. New phosphor dial. Soft rubber ring a feather. Sanitary. reproduction of radio dial A1475 Bracket. each .03 wiping contacts. Standard engages dial. Nothing tc A4747 Vacuum Tube Shell A1500 Cord GP jack. A3550 Fbnekushions, se A7799 Dial Button. A1508 Bracket, each .05 mounting type. -erne apart. Each $0.25 and Contacts $0.16 Each A6514 $0.49 41450 Vernier $0.12 of two $0.3.

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Hard Rubber Panels Copper Ribbon Rases Clip Leads Adapter PUSH -PULL M Woven Rasco 160° Variocoupler Push Pull Transformer Highest dielectric Invaluable for experimen Adapter. Bureau for ex- Silk wire wound on bake - .0005" thick. Parent Improved for many new circuits. strength as per THE vernier dial F701 V," tal work. Clip lead hooks radio magazine. Beautiful tra sharp tuning. Noback- life tubes. Six tape. Wave F700 %" wide; any wire, Takes 199 -type tubes. Fits See any of Standards. wide; F702 3 -16" ide. in a jiffy onto Made of best materials. high finish. lash. Special finish per length, 150 to 600 meters. binding post or conduc- standard 201A sockets. Sili- of stations All sizes per foot.w,.$0.01 Coils impregnated. $0.65 raits logging For panel mounting. %á" tor. Safest experimental Phosphor bronze springs. con steel laminations. A7108 on dial. Beautiful appear- shaft Your money re- Foll connection. Brass clips, 7I20 7x10x3 -16" 0.79 or Copper impossible. Save 50 per cent by as- 0.89 ance. Cotres in gold funded if it is not all we 1 foot silk wire, green or short circuits sembling yourself. Sim- A7I40 7x14x3 -16" silver finish. State which .001" thick. 4" wide. red. Bakelite molded. A7I80 7x18x3 -16" 1.15 claim. Copper Foil, ple instructions furnished. 7x21x3 -16" 1.81 wanted. per ea.$0.12 Push -Pull Trans - A7210 A3066 Microvern, any A3100 Variocoupler pre- A5(125 A7887 Clip leads, A1159 A7240 7x24x3 -16" 1.43 Dozen lot ...... 1.35 A6521 Adapter $0.36 fame-.rstlo8tt. to 1 $2.95 finish $1.76 paid $1.05 10 -foot length 0.80 ZTV 310 311 309 308 Binding Post Strip Tinned Nickel Lugs Battery Snap Switch Nosolder Lugs Low Loss Coll Low Loss Tuner "T" Wire Connectors Same type as used in Made of hard rubber, gold All our lugs are tinned. This Switch is produced in our This big little article Finally, a real solderless lettering. Two Lugs for No. under high standards of Same type as used lug is here. Soldering Freshman and o t h e r engraved A310 Brass L O L OS EXPLORER. solves all troubles when nickel brackets for mount- 8 screw, doz $0.10 workmanship. Action is wire rennet- Positively done away with. Tuned Radio Frequency Tunes from 200 to 600 making "T" bus sets. D.C.C. wire. 200- ing. 7 hard rubber bind- 4311 Copper Lugs for Nos. positive. Solderless con- in- tons. Made to take 1 -16" 'rakes square or round ANT"; dnz.0 10 screws used. One hole caetera. Hard rubber bar, which it holds with a 550 wave- length. 3" diam- ing posts. 6 and 8 screws, tact throughout. Sil- duare or round bus -bar 5 -16" A309 Copper Lugs for NOR. mounting. Nickel- plated ealation be vise -like grip. Perfect eter. 1" wide, ver plated primary. Sec- -ire. Can attached 4 connections. 2 "B "; "DET B-I- "; 4. 6 and 8 screws, doz.0.10 all over. Most serviceable with a of pliers. connection. Just slide bus thick - ondary D. C. C. Tickler pair slip -grip. primary, 2 secondary. "AMP B-4- ". A308 Copper Lugs for 6 -32 switch made. -A ?975 "T" Wire Con- bar into Binding Post doz. O Ill IA7986 5q ?s silk insulated wire. Lug. 25 for $0.20 A2629 Low Loss Coil $0.43 A870 $0.35 screw, A2690 Tuner $5.00 nectors, 12 for $0.10 A3727 f+'))llMan} ()==;) 3110 e032 DEmp» 315 6032 2900 3080 1 Ieá3 o a 651 202 1425 -3616 6504, Tips "Perfect" Lugs Brass Roda Bakelite Socket Binding Post Name Plates " Rasco" Posts Cord Phone Plugs , These new and improved Sold In 6 lengths only. Four nick Dia. R ". These styles Made of hard rubber com- Standard phone cord tip Sold from 50c to 65e Octagon shape. Phones, Ground, Out nickeled. lugs are brass, nickel A8032 Rod 8 -32" thread -, position. Plated. flattened on top everywhere. Hard rubber el binding posts, phospho put, "A" Bat. -, "B' A315 Each 90.03 length $0.06 Loud Speaker A050-51 Each $0.06 as shown. Made of t' composition shell and pat- bronze contact springs Pat -, Separable Cord Tips single piece of metal 4c' 132 Rod, 6 -32" thread ' C" Bat. -, Aerial, -{- A202 Has nickel plated length $0.06 ented cord tip holder. Fin- Best brown bakelite. Input, "A" Bat. -4-, "Il' bottom, each $0.06 No solder required. Wire Lead wire goes into tube. M6510 Balielite socket $0.40 Bat. -1-, Loop, "C" Bat goes in ferrule. Shank A1425 Rod, plain, a/." est workmanship through. Doren, each style 90.70 it Nickel A3I10, A3080 "Perfect" round, length $0.10 A6500 Tube Socket Made I. Newt "A" Bat colds tight. out. + "B" Bat A122 Initialed Binding plated, Lugs. Each 50.02 A36I6 Rod, plain 3 -16" Telephone entirely of composition. A6000 Name Plates, Set of 8. round, length CO n6 A1030 Rasco Per Set $0 25 0 19^0 Each 50.09 Dozen lots 0.20 Plug. Each $0.23 Best made. Each..50.35 Dozen $0.15 New 1926 "Rasco" Catalog No. 16 CONTAINS 300 ILLUSTRAT ONS, 500 ARTICLESOpS Also Logbook of all Broadcast i Stations NEW Rheostats and Potentio- 100- Ampere Storage Bat- meters Roberts Coils teries Just to name a few of the circuits: FREE Battery Lead Tags coils, used years. The V.T. as a detector and one-step Latest wrinkle. made in High heat bakelite base. Diamond weave Guaranteed for two one. Come with tapered, knurl- in standard Roberts-Cir- Only new material used. amplifier; all Armstrong circuits; metal, nickel-plated. pol- step radio frequency amplifier and de- A POSTAL Clamp tag on bat- ed knob, 2%" dia. Corn- _ to 570 case. ished. cuit. Tunes 200 Genuine hard rubber stage audio frequency plete with pointer. Used in 2. 3, or Acid - proof terminals. tector; three tery wire. and it won't meters. short wave regenerative dr- 4 circuits. These are Hard rubber vents. Strong - amplifier; CARD come off. These five styles: tube radio frequency ampli- `i 6 ohm genuine Sickles Coils. not carrying handle. Written cults; 4 -stage B +' , B -1- Det ". A4310 $0.38 Set comprises each. fiers; radio and audio frequency "B "A -I-", and "A A4311 30 ohm 0.44 imitations. guarantee goes with coupled ampli- BRINGS IT -", units, as illustrated. 100 -am- amplifier; inductively A4312 Potentiometer two A -9I00, 6 -volt fier; all Reflex Circuits. A- 8112, Roberts pere hour battery .. .99.50 A8030 Tags. set of 10 $0.15 200 ohms 0.50 Coils $5.95 Shipped express collect. SPECIALTY COMPANY, 1.00 Park Place, New York City RADIO Factories: Brooklyn, N. Y. Eldridge, Md.

www.americanradiohistory.com 1140 Scient and Invention for April, 1926 U.S. , PAT NTS Patent - dvic Edited By Don't Lose Your Rights A. P. PECK Before disclosing your invention to any- one bend for blank form "Evidence of Conception" to be signed and witnessed. A sample form together with printed in- In this Department we publish such is structions will show you just how matter as of interest to inventors and particularly to those to work who are in doubt as to certain patent phases. Regular inquiries addressed to "Patent Advice" cannot up your evidence and establish your rights be answered by mail free of charge. before Such inquiries are published here for the benefit of all readers. filing application for patent. As If the idea is thought to be of importance, we make it a rule not to divulge all details, in order to registered patent attorneys we represent protect the inventor as far as it is possible to do so. hundreds of inventors all over the U. S. Should advice be desired by mail a nominal charge of $1.00 is made for each question. Sketches and Canada in the advancement of inven- and descriptions must be clear and explicit. Only one side of sheet should be written on. tions. Our schedule of fees will be found NOTE: -Before mailing your letter to this department, see to it that your name and address are reasonable. The form "Evidence of Con- upon the letter and envelope as well. Many letters are returned to us because either the name of ception" sample, instructions relating to the inquirer or his address is incorrectly given. obtaining of patent and schedule of fees sent upon request. Ask for them, -a post card will do. CONNECTING ROD She asks our opinion as to the advisability of (929) Q. I. Donald Beidler, Lancaster, N. Y., marketing this device. submits complete details on a type of connecting A. 1. Since the publication of the short item rod bearing which is eccentrically arranged, and that you mention, many designs for drinking which when used in a four cylinder engine, will glasses and pitchers have been submitted to this force the piston to the extreme top of the cylinder magazine. Several of them were quite similar to Registered Patent Attorneys in U.S. and Canada on the exhaust stroke; yet on the firing stroke it yours and the one big objection to them all is 255 Ouray Bldg., Washington, D. C. will leave sufficient room for the firing chamber. that they are far too complicated to manufacture and sell at a reasonable "Originators of form Evidence This work is accomplished by means of a rather price. We have not as of Conception" complicated gearing system to be located in the yet seen one that, in our opinion, would ever com- opposite end of each connecting rod to that where mand a very wide sale, and the same holds true the piston is attached. for the one that you have designed. We do not

A. 1. While tSe theory of your proposed type . believe that it would be profitable for you to pro- of piston connecting rod is correct, still we do ceed with manufacturing this device, although not believe that the device would be practical since your patent has been allowed, you might be under actual operating conditions. It is entirely able to do something with it by communicating too complicated and the strain on a connecting with several large glass manufacturers and at- rod is far too great to allow the use of a series tempting to sell them the idea either outright or of gears and an eccentric such as - you have de- to have them manufacture the item and sell it on signed. Until you have tried your device out in a royalty basis. actual practice, we would not advise you to con- tinue with any attempt to patent it. You must TO THE MAN WITH realize that a patent cannot be obtained on an idea alone. The subject must invariably be re- AN IDEA duced to practice before it can be patented. I offer a comprehensive, experienc- ed, efficient service for his prompt, le- IDEA HAS BEEN PATENTED gal protection and the development of (930) Q. 1. J. E. Whitfield, East Pittsbugh, his proposition. Penn., has been granted a patent upon a particular Send sketch, or model and descrip- type of carpenter's tool and has been attempting tion, for. advice as to cost, search to induce sonic company, to manufacture it. He through prior United States patents, says that all the companies he, has written to de- etc. Preliminary a.dvice gladly fur- sire to be paid in advance and so he is suspicious nished without charge. of their intentions. He asks us to advise him. My experience and familiarity with A. 1. As long as you are protected by a patent, various arts frequently enable me to you can just as well go ahead and have your de- accurately. advise- clients as to prob- vice manufactured, paying the manufacturers in able patentability before they go to advance without any fear of their stealing your any expense. idea. You have come to the hardest part of the Booklet of valuable information and form inventor's career and you will undoubtedly have for properly disclosing your idea, free on some difficulty in placing your device upon the request. Write today. market. Extensive advertising and quantity pro- - RICHARD B. OWEN, Patent Lawyer duction will be necessary before you can ever real- 164 Owen Building, Washington, D. C. ize on your device and of course such a procedure 41V Park Row. New York City takes a good deal of money. We do not believe that you need hesitate further about having your device placed under manufacture by any of the ICE companies with whom you have been in communi- CONTAINER 'AT ER

cation. - - COM PARTM ENT Above is the design of a water pitcher so con- ICE PITCHER structed as to hold not only water but also who derive larg- (931) Q. 1. Miss Margaret Russell, Gary, In- cracked ice and at the same time to keep the est profits know diana, refers to an article published in this maga- ice separate from the water. It is not a new INVENTORS and heed certain zine some time ago wherein it was suggested that idea and we do not believe it will meet with simple but vital inventors work on the proposition of producing much enthusiasm. facts before applying for Patents. Our book Patent - drinking glasses and water pitchers, in which water Sense gives those facts; sent free. Write can be kept cold by means of ice. but in which the ice will not come in contact with the water. TURBINE LACEY & LACEY She submits a design for a water pitcher of this GASOLINE nature which design is reproduced in these col- (932) Q. 1. M. J. Peterson, Berkeley, Calif., 644 F STREET, WASHINGTON, D. C. umns and upon which she has obtained a patent. has devised a rotary gasoline turbine upon which Established 1869 he desires advice. A. 1. Several types of gasoline turbines have been patented and are quite efficient in operation. For instance, one has been developed by Dr. Nikola Tesla. Records of similar machines will be found in the Patent Office. Frankly, we do not believe that it would be profitable for you to pro- PROTIEÇT ceed further with your articular system. This INVENTORS is in view of the fact of the existence of other patents- and also because gasoline turbines do not Send for our Guide Book, HOW TO GET A PATENT, and Evidence of In- seem to be well received by automotive manufac- vention Blank, sent Free on reques t. Tells our terms, methods, etc. Send turers. model or sketch and description of your invention for INSPECTION and PATENT SEARCH INSTRUCTIONS FREE. TERMS (933) Q. 1. D. E. Lounsberry, Ardmore, So. Name REASONABLE. BEST REFER- Dakota. asks how he can obtain the numbers of all ENCES. patents that have been issued in the past five years dealing with a certain process. Stmt A. 1. The only way in which you could ob- tain the information that you mention in your RANDOLPH & CO. letter of recent date would be to employ some re- City liable patent attorney to conduct a search for you. Dept. 172, WASHINGTON, D. C. This process should cost in the neighborhood of $15.00 and possibly will be even less.

www.americanradiohistory.com 1141 Science and Invention for Apri1,1926

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INVENTO 'Write for the wow

At the left is a view of my drafting and specification offices where a large staff of experienced experts are in my constant employ. All drawings and specifications are pre- pared under my personal supervision. PROTECT YOUR IDEAS Take the First Step Today- on an old one, you If you have a useful, practical, novel idea for any new article or for an improvement Registered Patent Attorney AT ONCE. Every year thousands of should communicate with a competent made for patents are filed in the U. S. Patent Office. Frequently two or more applications are applications live in different sections of the for the same or substantially the same idea (even though the inventors may unknown to one another). In such a case, the burden of proof rests upon the last country and be entirely of a patent. filed. Delays of even a few days in filing the application sometimes mean the loss application below. So lose no time. Get in touch with me at once by mailing the coupon No Charge for Information Strict Secrecy Preserved on glow to Proceed Write Me in Confidence The books shown here contain valuable information relating to sketches, drawings, etc.; that every inventor should have. And with All communications, patent procedure in confidence in strong, steel, I will also send you my " Record of Invention" form, on are held strictest them only to which you can sketch your idea and establish its date before a fireproof files, which are accessible witness. Such evidence may later prove valuable to you. Simply authorized members of my staff. Feel free to mail the coupon and I will send you the books, and the "Record frankly. Your case will detailed information on how to write me fully and of Invention form, together with attention. It is probable proceed and the costs involved. Do this NOW. No need to lose have my personal a minute's time. The coupon will bring you complete informa- that I can help you. Highest references. tion entirely without charge or obligation. But FIRST-clip the coupon and get my Prompt -Careful free books. Do THAT right now. Efficient Service This Iarge, 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. CLARENCE A. O'BRIEN, We understand the technicalities of patent law. We know 1 the rules and requirements of the Patent Office. We can Registered Patent Attorney, proceed in the quickest, safest and best ways in preparing 53 -F Security Savings & Commercial Bank Bldg., an application for a patent covering your idea. Our success Washington, D. C. has been built on the strength of careful, efficient, satis- factory service to inventors and trademark owners located Please send me your free books, "How to Obtain a Patent." of in every state in the Union. and " Invention and Industry," together with your "Record Clarence A. O'Brien Invention" form without any cost or obligation on my part. Registered Patent Attorney Name Member of Bar of : Supreme Court of the United States; Court of Appeals, District of Columbia; Address Supreme Court, District of Columbia ; United States Court of Claims confined exclusively to Patents, Trademarks name clearly) Practice and Copyrights (Important: Write or Print

www.americanradiohistory.com 1142 Science and Invention for April, 1926 Model Boiler (Continued from page 1109) 1 PATENTS TRADE MARKS DESIGNS screwed into a socket could easily be mounted FOREIGN PATENTS áyßá in the ewer firebox. One of the most efficient electrical heaters for this or any type of steam driven model is MUNN & Co. that employing two metal sheets immersed m PATENT ATTORNEYS the water and separated about one inch from Associated rince 1846 with the Scientific American O. J. MUSSEFIL, each other. Not only is 618 Woolworth Building, New York Pioneer Musical steam generated in 525 City Saw Artist, bee great quantities Scientific American Bldg., Washington, D. C. taught thousands by such a form of heater, but 1314 Tower Building, mi Exsstars Chicago, Ill. Vaude the decomposition of water ordinarily taking 5Hobart and high priced place VanNuyss Building,1Los entertainers. when two plates are immersed into it Angeles, Cal. and connected with a source of current sup- Books and Information on Patents and TradeMarks ply, aids in making the device run faster. In by Request. this particular type of heater, it is desirable to insert a resistance at the point marked off, which resistance may take the form of a flat iron, a heating coil or several incandescent lamps. This resistance placed in the circuit PATENTS will prevent a short circuit and also prevent I make a specialty burning out of fuses. The alcohol gas of patents and trade marks. burner Protect and profit by your ideas. Advice a -.,:l illustrated in the diagram which has been terms on request. Fourteen years' active prat used with great success with this model is tice before U. S. Patent Office. Write today simply built up as indicated. The two small pilot burners are then lit and the heat L. SARGENT, Patent Lawyer pro- 524 Tenth duced by them causes gas to be rapidly St., N. W., Washington, D. C. evolved, which coming through the small openings in the covers for the wicks, or burn- ers as they may be called, produces a flame possessing a yellowish color PATENTS but developing a great amount of heat. BOOKLET FREE HIGHEST REFERENCES Note that the overflow PROMPTNESS ASSURED BEST RESULTS pipe leading to the alcohol reservoir serves a Send drawing or model for examination double purpose, namely, that and report as to patentability of permitting WATSON expanded alcohol to flow out through it E. COLEMAN, Patent Lawyer and 644 G Street, N. W., Washington, D. FREE! also preventing an accumulation of air in- C. side, and thus possibly spraying the interior 5- Day -Trial of the fire box with alcohol. This particular PATENTS ROMPTLY ç. Z.N POLACIEK burner may be put out by simply PROCURED. blowing into END A SKETCH OF PATENT ATTORNEY the fire box. There is OUR INVENTION. to Prove It never any danger with CONSULTING ENGINEER its use. The manometer contains a flattened INVENTION 70 WALL ST to prove how quick and easy you can FREE RECORDING ip NEW YORK. JUSTlearn to play a saw, I'll send you a genuine, copper tube bent in the form of a semi -circle. BLANK specially tempered Musical Saw for 5 days' When steam pressure is applied the tube tends NAMF trial. Iguaranteethat in 24 hours you can play to straighten tuneslike "OldBlackJoe "and in direct ratio to the pressure Home Sweet Home ". Then applied. [1.1ADDRESS- you quickly learn latest jazz For blueprints of previous MAIL TODAY and song hits, operatic and pages, 1109 and classical music. Amazingly 1110, a nominal charge of $1.00 is made. simple-no notes to read, no The complete set of blueprints, four in all, dreary practice. You don't may be had at need to know a thing about $2.00, and those desiring the INVENTION S _ Charles music. same should address their communications to play to `'mmercialized in Broadway (New the Editor of the Model Department, Blue- York) motion pic- Play for Money Fun ON A CASH OR ROYALTY BASIS ture theatre, or print Division. PATENTED The Musical Saw's only ri- or UNPATENTED val is the violin for sweet- /n Business 25Yeais -Complete faci/ties -references. ness and expression. Tone 1/rmADAM effects are positively start- FISHER MFG. Co., ling and so unexpected that 205D Enright Ave. St. Louis, Mo. nothing compares to it in winning instant popularity or becoming a salaried f tertainer. en- C. L. PARKER Hobert S. Alter. Its novelty gains $5,000 Ex- Member Examining Corps, U. S. Patent Office broadcasting tch- headline position for you. delighted You are always Attorney -at -Law and ldlá ead- in demand. i g stations, inei°d- for Solicitor of Patents fróm WIN r'Steem- Success Guaranteed shipLEVIATHAN". American and Foreign Patents secured. Searches made I have taught thousands to to determine patentability, validity and infringement. play the Musical Saw. Just Perpetual Pamphlet of Instructions sent upon request three short pimple lessons Motion MCGILL BUILDING reveal every secret of my WASHINGTON, D. C. 12 years' success as a pro- When SCIENCE AND INVENTION fessional saw musician. Magazine Scores of others have won was still in its infancy, the editors BLUE BOOK fame and fortune denied the possibility of constructing a per- ON PATENTS like the petual motion machine using those and Priority Record blank gratis. "Bud" Gamble Is three pupils shown here. forces of paying his way nature as we now know them. MONROE E. MILLER, PATENT LAWYER, Let me prove that you, too, 411 with quickly Since -6 Ouray Building, WASHINGTON, D. C. the Musical Is can play like a that time the editors have received ELECTRICAL ANU MIECHANICAL EXPERT now In Europe. professional. thousands of different designs for perpetual motion devices, and have received hundreds Personal Instruction of circular letters soliciting finances for the building of perpetual Be a lawyer Record motion machines. By Mail or law trained The editors know that if they receive these business man. qualify letters, there are thousands of others in to $2,o500.00 t. this $15earn,000.00 a year country who get similar letters and who fall University methods. TUITION LOW. EASY TERMS. Text books FREE. for the claims made in the numerous pros- furnished. Practical and authoritative non -resident course. Endorsed by bench and bar. Prepares for bar or business. Double -disc, demonstration - pectuses giving the earning capacities of the Over students. PERSONAL INSTRUCTION. Cueree. size phonograph record of various machines. tee to Coach free any graduate failing to pass bar exams. beautiful Saw solo and SPECIAL REDUCED TUITION OFFER now in force. Write duet, sent with full Most of the shares of stock for these per- today for particulars and book on law FREE. particulars of my free trial offer. You'll won- petual motion AMERICAN CORRESPONDENCE SCHOOL OF LAW der that a saw can produce machines are being sold at a Dept. 3601 Michigan Avenue, CHICAGO such marvelous rate of $1.00 per share, although 1424 music. But the record proves it. Enclose 10 some inven- cents (stamps or tors are trying to sell shares of stock at coin) to cover record hand- $100.00 per share. STUDY AT .HOME ing and postage. Or if you do not want the Become a lawyer. Legally trained record, just ask for my big FREE TRIAL Therefore the editors of this men o high postonsiid d big OFFER, publication success in business public life. sent postpaid. It will tell you how say. "Just come in and show us- merely independent. Greater opportuni- you can get Saw, Bow, Soft Hammer and SHOW us -a working model of a perpetual ties now than ever before. Big corpo- Resin FREE with Course of Instruction after motion machine rations are headed by men with legal I prove and we will give you $5,000.- tining. Earn how quickly you can play. 00. But the machine must not be to $10.000 made to We guide you steep5booDstep. You train Ahom ádur- MUSSEHL to WESTPHAL operate by tides. winds, waterpower, natural g epee time. Degree of LL.B. conferred. LaSalle 336 West Water St. Fort Atkinson, Wis. evaporation or humidity. students found among practicing attorneys of every It must be perpet- elate. We furnish 11 text material, cludiag fourteen -volume Law ual motion." Lt ird re. Low, o t, easy terms. Guide" end Get our loable 100. age "Law Evidence" books free. Send for them NOW . LaSalle Extension University, Dept. 4384 -L Chicago The World's Largest Business Training añn t:L.1kea

www.americanradiohistory.com 1143 Science and Invention for April,1926

Tarrano the Conqueror TCROAPDYER- (Continued from page 1138) PATENTS signals shrilled in crazy fashion. Public OUROUR__ FOR THE PROTECTION mirrors were dark, or turned to places and time wholly irrelevant. OFFER OF YOUR INVENTION In the palace itself we soon secured a semblance of order. Maida's girls were YOUR FIRST STEP before disclosing here, with wet veils and long dank tresses . should write an invention. The inventor clinging to their sleek bodies. Lips painted for our blank form- alluring red. But eyes which now were solemn and grim. Their demeanor alert and business -like. Unconscious of them- of Invention" selves they moved about the palace, exe- "Record cuting Maida's orders. This should be signed and witnessed and A dozen or so of Maida's personal re- returned to us together with model or tainers were here-and most of the Earth- sketch and description of the invention men. Keen -eyed young men of the Wash- a n d INSTRUC- ington Headquarters Staff. One of them - f o r INSPECTION Tomm Aften by name, a ruddy, blue -eyed TIONS. fellow -was in command. He stayed close by Georg and me. NO CHARGE FOR THE ABOVE INFORMATION The city was seething. But out of the chaos was coming a comparatively orderly Four Books Mailed menace. We could sense it at first; and Our then in a few brief minutes so swift that we had no time to prepare -the menace be- Free to Inventors came obvious and was at hand. Our Illustrated Guide Book The slaans had withdrawn from the fes- tival for a greater, more organized effort. A PATENT Their revolt against Tarrano in which HOW TO OBTAIN Maida had joined, was bigger, more deep- Contains full instructions regarding U. S. Patents. rooted than a mere revolt. It was against Our Methods, Terms, and 100 Mechanical Move- Maida herself. Trickery of the down- ments illustrated and described. trodden slaans against the ruling class. Against the old order of government. Even against the Rhaáls, who in their distant OUR TRADE MARK BOOK city were all- powerful, but who obeyed the Shows value and necessity of Trade Mark Protec- laws and took no part in anything. tion. Information regarding Trade Marks and un- fair competition in trade. Revolution ! From down the waterways of streets which converged into the broad lagoon before the palace, boats began ar- OUR FOREIGN BOOK riving. Boats crowded with slaans. Di- We have Direct Agencies in Foreign Countries, and sheveled, unkempt men and women with Patents in shortest time and at low- primitive weapons of steel and wire bran- secure Foreign dished aloft. They surged into the la- est cost. goon. A murderous, frenzied mob - thoughtless of itself, suicidal to attack us, yet daring everything in its frenzy. Progress of Invention Soon the lagoon was crowded -a chaos Description of World's Most Pressing Problems of pushing, shoving boats. Then the boats by Leading Scientists and Inventors. began landing, disgorging their occupants, wild -eyed slaans each a potential murderer. The gardens of the palace were presently IMPORTANT jammed with them. They did not at first come within our threshholds ; they stood Do not submit your invention to anyone before you furnish proof that the about under the palms, trampling milling invention is patentable or application has been filed. IN ORDER TO the tropic flowers, screaming threats and DELAY YOU epithets at us. But waiting -as a mob al- HAVE YOUR CASE MADE SPECIAL TO AVOID ways does -for some leader to advance, SHOULD TAKE THE PRECAUTION OF HAVING YOUR CASE that they might follow him upon us. MADE SPECIAL IN OUR OFFICE to secure protection, save corre- I must We stood on the palace roof -top. spondence and secure early filing date in Patent Office. To secure special confess that we were in a flurry for the with model, sketch and moment. There were undoubtedly weapons preparation of your case send $25.00 on account at hand, but I at least did not have them, description of your invention. nor did I know where they were. Excus- Interference and Infringe- able flurry possibly for the thing had come All communications and Data Strictly Confidential. so quickly, and most of us were strangers ment Suits Prosecuted. Our Organization offers PERSONAL SERVICE here of but a few hours. by Experienced Patent Solicitors and Draftsmen. The roof had a low railing waist -high, but broad. We stood clustered behind it. We Regard a Satisfied Client as our best advertisement, and furnish anyone, In the garden beneath, the mob was shout- upon request, lists of clients in any state for whom we have secured patents. ing up at us. And, before I could stop her, Maida had leaped to the top of the rail. Highest References-Prompt Attention-Reasonable Terms Georg and I clutched at her, then steadied her. WRITE TODAY "Slaans -" - But they would not hear her. Shouts VICTOR J. EVANS & CO., Patent Attorneys went up ; a roar of threats. The press of FREE New York Offices Philadelphia Offices Pittsburgh Offices additions to the mob landing from other 1007 Woolworth Bldg. 714 -715 Liberty Bldg: 514 Empire Bldg. boats, forced the front ranks forward. COUPON Chicago Offices, 1114 'Tacoma Bldg. San Francisco Offices, Hobart Bldg. They were now on the palace steps, Main Offices, 779 Ninth Street, Washington, D. C. jammed there waving their weapons yet still hesitating to advance. Gentlemen: Please send me FREE OF CHARGE your books as described above. "Slaans -my people-" Name Address (Continued on page 1146)

www.americanradiohistory.com 1144 Science and Invention for April, .1926

Medical Frauds By JOSEPH H. KRAUS (Continued from page 1084)

executed on the gallows, and was a specific for anything from ingrowing' toenails to falling hair. A serious article on "Usnea" and "Mummy" may be found in the first edition of the Encyclopedia Britannica, and,

Master Electricity By Actual Practice The only way you can become an expert is by doing the very work under competent instructors, So- called magnetic or electric` rings have ab- which you will be called upon to do later on. In solutely no value in a medical sense. other words, learn by doing. That is the method

of the New York Electrical School. - incidentally, in Dr. James J. Waisifs book, Five minutes of actual practice properly directed called "Cures." is worth more to a man than years and -years of book - -FETISHES AS CURES study. Indeed, Actual Practice is the only training A little later a hangman's noose or por- of value, and graduates of New York tions of the rope with which a person Electrical was hung, were supposed to "turn the blood School have proved themselves to be the only men current," when a person : was .touched with that are fully qualified to satisfy EVERY demand the piece of rope, and thus were expected of the Electrical Profession. to cure paralysis, disabled limbs or wasted fingers. The Only Institution of the Kind Coming down through the ages a few more years, we find- rattlesnake oil Used ex- in America tensively in the West. a matter of fact, At this "Learn by Doing" School a man acquires the there are many medicine men traveling art of. Electrical Drafting; the best business methods and through the Middle -and - Western States,. experience in Electrical Contracting, together with the and occasionally making their appearance skill to install, operate and maintain along the East Coast, who are still selling all systems for pro- rattlesnake ducing, transmitting and using electricity. A school for oil. This.oil is supposed to have Old and Young. Individual instruction. been made from rattlesnakes.. It is, how- ever, no more efficacious than ordinary but- Over 10,000 Graduates are Successful Men ter. - On analysis, the oil -is no _different in the Electrical World from other oils extracted from animal fat tissue. 41 .0880 mills No previous knowledge of electricity, mechanics or ", f/fiSU11 hfti ,e dewR mathematics is necessary to take this electrical course. ABANDONED MEDICINES , You can begin the course now and by steady application Then along came sarsaparilla. Millions of prepare yourself in a short time. You will be taught by people swore by it. - Hiindreds -of- thousands practical electrical experts with actual apparatus, under of bottles were purchased every year, but actual conditions. no one takes any New York Electrical School sarsaparilla now except as The N. Y. E. S. gives a special Automobile Ignition a seasoning for soda water. The product 29 W. 17th St.,. - Course as an advanced training New York, N. Y. for Auto Mechanics, Garage Men and Car Owners. The course covers com- Please send FREE and pletely all Systems of Ignition, Starters, Lighting and without obligation to me other electrical equipment on automobiles, motor boats, your 64 -page book. airplanes, etc. At the left is shown Let us explain our complete course to you in person. If a typical "electrical" you can't call, chest protector in Name send now for 64-page book -it's FREE which to you. series of copper and zinc disks are Street placed.' The curative New York Electrical pöwers of a contrap- School tion of this nature are City 29 West 17th Street, New York absolutely nil. Money invested in a device such as that shown is wasted. LEARN RADIO Become a bigpay man in the is sometimes used to mask the taste and right greatest industry of all time. Quickly, easily of un- at home, you can fit yourself for highest salary positions, or you pleasant medicine, but otherwise it does no can cash in on your spare time. The call is urgent for mechanics, operators, designers, inspectors. Unlimited, fascinating opportunities good. on land or sea- We next hear of the long line of bitters 1 7RAlN AT rab YOU HOME ®1 A RADIO and - whiskey tonics. These were wonderful Under my practical easy EXPERT ingly short to understand, instruction-you qualify in an amaz- medicines, and cured everything from idiocy time. No previous experience is necessary. Every branch alt rheumatism. radio becomes an open book to you. You learn of to Cheap whiskey and colored operate repair, maintain how to design, construct, water, to are the and sell all forms of Radio apparatus. My methods which some bitter drugs were latest and most modern in existence. added, were remedies for every known ail- Wonderful homeeonstruetic tube'w, FREERrr oi receiving set of the latest designs ment or disease, but they, too, passed away. A. G. Mohaupt, Write Todayi oday Fatta" FREE Radio Ens ineer,RADIO ASSOCIATION OTHER FADS OFAMER ICA, Dept. 64, 4513 Ravinswood Ave., Chicago, USED TO TREAT DISEASES At about the time that the bitters were so popular, there was a "blue glass- cure" craze. People would sit for hours behind Insure your copy reaching you each month. Subscribe to a blue glass window taking blue -glass baths, Experimenter Science and Invention -$2.50 a year. Publishing Co., 53 Park Place, N. Y. C. and it was not very long ago that I listened to a lecture given at a well -known New

www.americanradiohistory.com Science and Invention for April,1926 1145 York hotel, where the "doctor" advised that every light color has its distinct effect upon the human organism, and that a person born under violet light was bound to be healthy, while those born under the influence of The One Thing You Need yellow light, or in a room lighted by yellow lamps, had practically no chance.--r-. of surviv- for the Big -Pay Job Combs are often sold that contain small bar magnets in the back as shown in our illus- tration at the right. These mag- nets are supposed to have a stimu- lating effect on "I aleb the hair when the f f RICAN combs are em- iï. ployed. This is ,i ,iï?1Q1 'i1 ! untrue as has been t,"fRICIANS, 1111IARY You're 1r. rlilY ^ frequently proven. 'VARY !IMi Therefore, do not - tFT Get waste your time RitFT bound R(aFr IioFT `F .w..w. and money on a CROFTZ going comb of this type. to get and it get it some Now ing. The "doctor," himself . a healthy speci- day men, claimed that he was not born under the influence of violet light. QUACK REMEDIES Many of our readers can remember when electric belts and magnets were used as the treatment for any kind of an ailment. These Y The Man Who Knows Gets batteries, which were strapped around the waist, became polarized almost the instant o they were applied and, consequently, gave the Big Money -Every Time no current. Nevertheless, according to their U Big pay comes swiftly and surely to the man who knows practical electrical wearers, they produced remarkable effects, work complete. The electrical field offers wonderful opportunities to men and testimonial upon testimonial piled in to with training enough to work themselves into the big pay jobs that are open. the concerns handling the articles. Among o The chances are that training is the one thing you need to jump ahead to the electric cure -alls were the electric shoe - W real big money. A few hours a week spent now in getting your training will soles, electric combs, magnetic combs to help you immediately on the job, will prepare you for quick and steady pro - stop the hair from falling out, electric rings E motion, and without a doubt will start you to making your entire life happier and magnetic rings, generally made of steel, and more comfortable. which "drew the poison out of the body," I Isn't this training worth getting? Isn't it just what you want? Start on as the finger showed when the ring was it right away ! removed, because a brown stain was left T behind. This stain was merely a stain of rust. Rings of zinc were also worn. AMERICAN ELECTRICIANS' LIBRARY How many of our readers remember the T The six volumes of AMERICAN ELECTRICIANS' LIBRARY bring you flaming red chest protectors that could be step -by -step directions for the installation of every type of conduit wiring job; obtained at any local pharmacy, and may be o they tell you just how to handle every kind of lighting circuit and switch job; found in some of them even to this day? they give you stunts for saving time on maintenance routine; they give you usable Many of us recall the vacuum cup craze, tips on electrical machinery erection; they offer you practical, clear explanation or the kidney- shaped plasters, which were of all kinds of A.C. armature winding jobs ; they bring you a thousand armature to relieve pains in the back and cure all o winding and electrical machinery and control diagrams ; they show you the surest, sorts of diseases. Many will recall the quickest methods of locating and remedying circuit troubles. They cover a absurd "liver pads" of a generation ago. U thousand and one problems that you have to face daily. Now, the fact of the matter is, that, with R the exception of acute nephritis or a stone The only library of its kind-just out! in the kidneys, the kidneys themselves give S The thousand wiring diagrams in these six books are alone worth s no pain whatsoever. The worst cases of the price of the entire library to any man who wants to succeed in Bright's disease, representing more than the electrical field. Many of these diagrams are unobtainable else - seven- eighths of all the kidney diseases, so L where ; many more are very hard to get from any other source ; all are much called, run their course without any discom- of them clearer and more helpful than most wiring McGraw.Hill F diagrams available. These wiring diagrams alone make fort. These lumbar pains are located pri- s Book Co.. Inc , marily in the muscles of the back. Croft's AMERICAN ELECTRICIANS' LIBRARY a ¡ 370 Seventh Ase Our advice to readers is to know what great set of books. / New York. they are purchasing before they buy it, and Free examination -small monthly . Gentlemen - Please send not to depend on the glaring advertisements CI me the Croft American in the shop windows, which are meant to payments s Electricians' Library (ship - In this new Library you are offered $17.50 worth of new pins charges Crepaidl. for to deceive. The statements on the box are all books at a special price for the set of $16.00, payable $2.00 days' on. i oryr I wit] aendif2.0o?insten that count. No concern has been prosecuted S in ten days and $2.00 monthly for only seven months. until You need word for days and $2.00 per month for window advertising, and window pla- not take our the value of the books. Elo.00 has been paid. It not wynted. cards may make any irresponsible or mis- U You may examine them yourself in your own home I will write you for return shipping for No purchase-noy instructions. (Write plainly and flee in leading statements, but the Government keeps C annoyingafollowannoying -u P- red tape.Q .even. pay all lines.) a rigid control over the statements printed return charges, should you decide to return the j on the labels of all drugs. C set. Take advantage of this liberal plan to examine these books for yourself and see - Name In this magazine we will only discuss the E how much they can help you. Don't reputable, bona fide systems of treatment. stand in your own way. i Cancer cures are not recorded, because, up E SEND NO MONEY Address to the present time, such a thing as a MAIL THE COUPON cancer cure has not been discovered. Treat- D Position ments for cancer are numerous, but they in packages to be and this coupon are not found dollar pur- company 4.1 -I' chased at the local drug store and used starts you to success S.T. indiscriminately.

www.americanradiohistory.com 1146 Science and Invention for April, 1926 2 Generations of Hononzbie Dealings JEWELRY CO. Tarrano the Conqueror BOSTON, MASS. (Continued from page 1143)

It's SHOCK -PROOF! Maida's frail voice was lost in the up- roar. Then a missle was thrown upward - a portion of a broken generator -a heavy chunk of metal. It barely missed Maida, and fell with a thump to the roof behind us. Then came others -a rain of them about us. I tried to pull Maida back, but she fought me, her voice still calling out its appeal. With a bound, Georg was up on the rail Wear it beside her. Aften -the young Earthman - for 10 days had quietly handed hint a cylinder. Georg at our expense! waved it at the mob with one hand, and his Waltham "SPORTSMAN" other arm was about Maida's waist. "Slaans His stronger voice Strap Watch Send NO Money! NOTHING to Pay Postman ! -" caught The coupon brings their attention. A sudden hush fell. REMARKABLE Waltham achievement-designed for it to you for 10 days' trial hunting, camping, golfing. fishing. strenuous outdoor absolutely FREE! Test it under most strenu- "Slaans -it is I, Georg Brende. Your sports. Has the wonderful ous conditions. "SHOCK- PROOF" movement, If pleased you may pay at the Princess Maida rules you now only under double -strength mainspring; steel wheels, plates. escape- rate of $5 MONTHLY ment. Impervious to weather and shocks. Sizzling sun, or me. A new ruler, Slaans -the man of freezing weather, jars, exposure do not affect its time- if you wish to pay cash within keeping. Built into special DUST -PROOF, MOISTL'RE- to days, deduct $1.75 and send Earth -Georg Brende who must be obeyed PROOF case. Check or Money Order for 4,122 -Georg Brende, soon to be husband of Professional Men, Business Men, Sportsmen, Globe- Trotters Strap Watch is Here to Stay! your Princess -" are AMAZED at Its Performance! HE demand for Strap Watches is increasing daily. But they would not hear him out. The WE have sold hundreds to professional men, business Men in every walk of life are wearing them because men, sportsmen, globe- trotters they din from them submerged his voice. His its -they are amazed at are so handy. "A twist of the wrist-there's the marvelous performance under most gruelling condi- time." It does away with fumbling in pockets and un- lips snapped tight as abruptly he ceased tions. CASE is gold -filled, double stock; handsome cushion buttoning of coats. Waltham Watch Co., realizing the shape that wins admiring glances. Radium numerals and Nation -wide Vogue, designed the talking; his brows lowered grimly and I hands tell Shock -Proof "SPORTS- the time vividly in pitch darkness. ss MAN" - smart enough for dressiest functions - sturdy saw his finger press upon the cylinder. Strap is genuine pigskin. Regular price $30.00. $23.15 enough for most strenuous sports. The coupon brings one Our price (while the limited quantity. lasts) to YOU for 10 Days' FREE Trial. Maida's voice screamed : "Georg ! Have mercy ! Do not kill !" MMI 1 them I WASHINGTON JEWELRY CO. Gentlemen: -Send me the $23.75 Wal- Send She spoke barely in time. His cylinder them Shock -Proof "Sportsman" for ]0 NO Money ! swept Importers and National Mail Order House Days FREE. Trial. If pleased, within upward. The rays from it caught 1 365 Washington Street, Boston, Mass. 10 days I have the privilege of pay- I NOTHING to only the upper portions of the palms and I Largest Distributors of Waltham ing $5.00 monthly or of deducting $1.75 and sending $22.00 in full set- Pay Postman: the tree tops. The foliage withered, shriv- I "Sportsman" Watcher in the World tlement. Otherwise, I shall return it. a Simply send eled before that soundless, invisible blast. INAME Not a blast of heat. The mob, surprised, I the Coupon i ADDRESS I NOW! then frightened, stared upward. The soft tropical foliage in a great wide swath was iltTear out and mail this coupon NOW! If you wish to tell us something about your - soif, itcwill be appreciated -simply write on clip of paper. S. I. 4 -21 dead, with naked sticks of limbs. Black, MOM then turning white. Not with heat -but cold. Ice was forming from the moisture in the humid air. And then the sudden condensation brought snow -a thick white fall of it sifting clown into the palm -laden garden ; falling gently, then swirling in a A REAL CIRCUIT PLUS GOOD PARTS sudden wind which liad begun. As though itself stiffened by the cold just THE COMBINATION YOU HAVE BEEN overhead, the mob stood transfixed. Then LOOKING FOR -- NOW AVAILABLE IN a murmur of horror came. And I saw THE BREMER -TULLY through the veil of whirling snow, that in- to some of the trees slaans had climbed. Their bodies, frozen now, slid and fell - black plummets hurtling downward through COUNTERPHASE the swirling snow- flakes. (To be continued) 4, 5 or 6 Tube Now you can build that receiver, secure in the knowledge that it will not be obsolete next year or the year after. The Radio Constructor The Torostyle R. F. Transformer (patented) By A. P. PECK were designed for the Counterphase and they BT may be purchased singly or in kits. (Continued front page 1128) No. 5 Kit contains the essential parts for the 5 tube (2 stages R. F.) set Price $28.50 'tOROSTY L E '° FOR No. 6 Kit contains the essential parts for the 6 to prevent distortion. Where a 4% -volt "C" EASY VfIf il NG tube (3 stages R. F.) set Price $38.00 battery is usually accepted as standard, a I- to 9 -volt battery may to you th e 9th edition of be necessary when the. eliminator is used. TEN CENTS Bbretteingsr T uni ng just off the press . A fund of information for all those interested in radio- When considering the construction of a Counterphase fully discussed, wiring diagrams on the 4, "B" battery eliminator, do not be misled by 5 and 6 tube sets -acquaints you with all the B -T parts attempting to incorporate inferior or make- and circuits which have created an enviable name for B -T. shift parts in it. It pays to buy the The biggest dime in radio! Circulars sent free! best in the beginning even though they cost a litle more. Since the tube life as mentioned O532 SO. CANAL ST. above is a good many years, you can safely BREMER-TULLY MFG. C . CHICAGO, ILL. count upon using a well made "B" eliminator for as long a period of time as you desire to think of. Even at that the instrument will probably exceed your expectations both $150 te 8300 PoaeorM EASILY Wiéi+ ONE DAY ëawÁCa in operation and in length of life. We are Thousands of HB users are making big profits every month. Every quite sure if you build an eliminator of the car owner and radio owner wants quirk, reliable One Day Charg- in ing. Get their business with an HR One Day Battery Charger. type shown this article that you will be Small rash payment brings you complete outfit on 30 days' trial more than pleased with the results obtained. with money back guarantee. Only $16.50 monthly pays for your HP,. easily made many times over by your increased battery charging In case you are not sure just where to buy business. Get an HF now. Start making $150 to $300 clear monthly the profits. Write for free bulletin 326. various parts for this unit, a stamped HOBART BROS. CO., Box S4 TROY. OHIO addressed envelope addressed to the atten- tion of the writer will bring a list of the MORE HB CZ BATTERY CHARGERS Mt MAKE manufacturers to you.

www.americanradiohistory.com 1147 Science and Invention for April, 1926

The New Cosmic Ray By PROF. D. H. MENZEL, Ph.D. (Continued from page 1092) THE WAR DEPARTMENT OF PROBABLE SOURCE OF COSMIC RAYS Where do these rays come from? It is SHE UMTED STATES kE AMERICA clear that they do not come from the sun, RECOGNILES IN THIS AWARD FOR DISIINGUISHED SERVICE for no change in their intensity was observed lHF LL'O V111 ENERGY AND EFFICIENCY IN IHI PERFORMANCE throughout the clay or night. In view of the OF THE WAR WORK BY WHICII enormous quantities of energy necessary to tic Ainrriran :drphnnr.t %drgrnph ({ttlupanr, produce X -rays, it is obvious that still greater AIDED YI:ATF.RIAITY IN °MINING VICTORY FOR IHE ARMS sources of energy are needed for the cosmic OF 1111 UNFIE) STATES OF AMERICA IN THE W fiR WITH rays. Professor Millikan suggests that it is probable that these rays originate from the THE IMPFREAL (_,i RMAN C,OVF.RNMINC AND THE IMPERIAL decomposition of atoms in the far off stars AND ROYAL AUSTRO HUNGARIAN GOVERNMENT and nebulae- transformations similar to those whereby radium gives off the gamma rays, but about fifty times as powerful. When we recall the disastrous effects of X -rays and their serious burns we are thankful that the cosmic rays do not exist in sufficient enough quantity to cause any harm. Telephone Preparedness

LEAD BOX I CM. OR MORE THICK

NINE years ago, when this nation system by which people par at was preparing for war, it found the hand and far apart could talk to one Bell Telephone System ready for another as if face to face. He fore- service at home and abroad. The saw a usefulness for the telephone war found the Bell System prepared. which could not be achieved with- From its technical forces so needful out innumerable developments, to meet our war -time activities in this inventions and improvements, to country, fourteen battalions were him unknown. But not even he fore- organized to carry to the front the saw the marvelous applications of highest developments of the tele- telephony which gave to the Alneri- phone art. No other nation had so can armies that fighting efficiency complete a system of communication which is possible only when there FIG. 6 to aid in mobilizing its resources. No is of complete An electroscope enclosed within a lead box was instant exchange affected by the cosmic ray almost as readily other nation was able to put into information. as if there had been no enclosure. the field a military communication, Since the completion of its service system of equal effectiveness. in time of war, the Bell System has Fifty years ago Alexander Graham devoted itself to the extension of the IO MILES Bell, the inventor of the telephone, telephone as one of the great ONE -TENTH ABOVE art gave to the world a new art. He had agencies for the development of the the vision of a nation -wide telephone pursuits of peace.

NINE-TENTHS OF THE ATMOSPHERE BELOW ( AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND ASSOCIATED COMPANIES

EARTH " -

FIG.7 BELL SYSTEM

The presence of cosmic rays was detected at almost the limit of the earth's atmosphere. IN ITS SEMI -CENTENNIAL YEAR THE BELL SYSTEM LOOKS FOR- proving that the rays were coming from space. WARD TO CONTINUED PROGRESS IN TELEPHONE COMMUNICATION

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www.americanradiohistory.com 1148 Science and Invention for flpril, 1926

WRNY for New York Visitors SAVE TIME AND MONEY By CHARLES D. ISAACSON (Continued front page 1125) We have radio Tools ofevery description WRNY carries a Church Index. Every For every conceivable set building'purpose Sunday morning the services at churches of all creeds are announced. Of course, in You will be astonished & heremdrÁ /e too /s addition, Dr. Christian F. Reisner preaches. LYE' have for par /vorfrondde /I: Wed al our Services are broadcast from Temple Emanu- lote/ prices El, and other religious bodies are heard from. There are Protestant, Jewish and Catholic circles, which are of interest to all faiths. We have as well our "Music of NO. 202 COMBINATION PLIER All Religions" period each Sunday afternoon. Combination Plier, Wire Cutter, Wire A big night was that when the whole corn - Former and Wrench. Drop forged, slender pany of "The Taming of the Shrew" ap- but exceptionally strong. 6 inches long. peared in the "Up and Down Broadway No. 202- Combination Plier, Wire Cut- Review." ter, Wire Former and Wrench 75c I wonder if out -of- towners were with us at the RADIO TOOL SET back -stage broadcasting of "Earl Carroll's Vanities," when all the beautiful This is the handiest set of tools ever made girls and comedians spoke into the micro- for Radio Work by the makers of the famous "YANKEE" Tools. It contains the follow- phone. Frank Tinney was there and told the ing: 1 Ratchet Screw -driver, 6% in. long people he was a lecturer and not a comedian; holding all attachments ; 1 Blade, 5% x that he had lectured on the sex of canta. 3 -16; 1 Blade, 3% x V; 1 Blade 2% x%; loupes that very afternoon. 1 Countersink ; 2 Socket Wrenches for all NO. 701 small nuts ; 1 Reamer to enlarge holes in panel from '4 to % ; I Wrench, one end 5 -16" square or hex. for jack, other %" hex., etc. Contents for PRICE per set -No. 701 $3.00 April Issue of Radio News The Experimenter's Own T R F Set 11111112solzil SIDE CUTTING NIPPER, By A. P. Peck &19. LAP JOINT This constructional article will be sure to interest all fans who like to experiment with For cutting all kinds of wire. Jaws hardened new circuits. This adaptaton of Tuned R.F. and oil tempered. Natural steel finish with is one of the best we have seen. polished jaws. Length 6 inches. Other interesting articles in this issue: PRICE -No. 201 75c Around the World in a Radio Equipped Lifeboat By A. Dinsdale NO. 201 CIRCLE CUTTER The Phantom Radio Dinner By G. C. B. Rowe Especially designed for the Radio Construc- The Radio Watchman at the Gate tor. Made of the finest material and equip- By Dr. K. Schuette ped with the highest grade high steel cutting New Developments in Radio Apparatus bits. It does three things at once. It drills By William J. its own pilot, cuts out plug and puts bead or Griffin A Crystal Hook -up Using Both Halves of scroll around the hole in one operation. the Wave Cuts holes % to 4 in. in diam. PRICE-No. 402 $3.00 401. Same tool but smaller and not fitted A VETERAN OF THE BATON Nos. 401 & 402 with bead or scroll in one operation. NO. 304 listen PRICE -No. 401 $2.00 Did you in that night when Romu- aldo Sapio conducted an operatic period with SCREW STARTER and DRIVER Louis Stallings, the famous American so- prano? Romualdo Sapio was at one time Holds any screw by its slot with a firm grip, conductor makes it easy to place and start screws in of the Metropolitan Opera House; difficult places. Just the tool for the Radio was on tour as conductor for Patti and for Constructor. All parts heavily nickeled and Calve. While he was at the studio, I showed polished. him an old autograph album of my aunt, PRICE -No. 304 $1.00 Kate Brand, who was second leading woman in the Patti company. In this is a page NO. 800 ELECTRIC SOLDERING IRON which bears an autograph from Romualdo A perfect tool for Radio Work. Operates Sapio to Kate Brand, written in Boston in either on 110 -volt A.C. or D.C. The heat 1865, so Sapio added "Still Alive Kick- element is of Nichrome, which prevents over- and heating and assures the desired even temper- ing at 1926." ature. Size of Iron, 10% in. long. A 4 -ft. The Charles D. Isaacson Sunday night cord and plug is furnished. concerts continue to be of extreme interest, PRICE No. 800 $2.00 and are probably the distinctive musical NO. 302 events of our program. For visitors to HAND DRILL New York, the invitation is ever extended, Especially designed for Radio Work by the that you make it your business to be our makers of the famous "Yankee" Tools. A guests at these concerts, beautiful balanced, which are held in small, powerful drill with De Witt Clinton Hall, at 59th 4 to 1 ratio of gears for speed. Special chuck Street and 9 -32" capacity, to take largest drill, mostly Tenth Avenue. furnished with drill or tool sets. Length We broadcast also a card party which was over all, 9% in. Weight 1% lbs. held in The Roosevelt by the Federated PRICE -No. 302 $2.75 Women's City Clubs. There were 1,900 women present. Order all tools by order number. All goods are shipped free of transportation charges to all parts of The feature of the af ter- the United States and possessions the same day as the order is received. noon was the grand march of the four hun- dred presidents of city clubs, and each presi- MONEY REFUND GUARANTEE dent spoke a few words into the microphone. I If you are not satisfied money will be refunded on return of goods. hope I may meet you all, face to face, soon. THE NOTICE RADIOOEM Sentence in first physics problem page 1009 CORPORATION March issue should read `Aim along line 66 -S West Broadway New York, N. Y. AB to hit the fish" and on page 1038 should read ". . necessary to aim fish...." behind the

www.americanradiohistory.com 1149 Science and Invention for flpril, X926

IMPORTANT TO NEWSSTAND READERS IN order to eliminate all waste and un- sold copies it has become necessary to supply newsstand dealers only with the ac- tual number of copies for which they have orders. This makes it advisable to place an order with your newsdealer, asking him to reserve a copy for you every month. Otherwise he will not be able to supply your copy. For your convenience, we are appending herewith a blank which we ask you to be good enough to fill in and hand to your newsdealer. He will then be in a position to supply copies to you regularly every month. If you are interested in receiving your copy every month, do not fail to sign this blank. It costs you noth- ing to do so.

To Newsdealer Address Please reserve for me copies of SCIENCE & INVENTION every month until I notify you otherwise, and greatly oblige, Name Address

Station A cross section of an underground coal conveyor WRNY in a Pennsylvania mine. NEW YO R K 258.5 Meters -1160 kilocycles A wheelbarrow four miles long is owned and operated by the publishers of this maga3ine Our Editors will talk to you Ten thousand tons of coal a several times every week- day travel underground on See your Newspaper for details this 4- mile -long conveyor. TUNE IN ON To meet the colossal demands of the With its G -E motors and WRNY mining industry the General Electric automatic control it almost Company produces example locomotives and runs itself-a thrift conveyors; it de- for the whole world. signs motors, large and small, for huge stripping shovels, Somewhere in your factory, loaders, fans, pumps, office, or home, there is a hoists, and under- cutting machines - task that electricity could do $11,000 all bearing the mono- better and cheaper. for Spirits gram G -E.

More than two years ago SCIENCE AND INVENTION Magazine offered a ELECT \ IC to anyone who could GENERAL prize of $11,000.00 demonstrate his or her ability to communi- cate with the spirits or to give some definite form of a psychical demonstration which in itself was not trickery. The result has been that mediums and spiritual organizations have been afraid to place proofs before us. Those weak at- $1900 to $2700 Year tempts which have been made to demon- strate psychical phenomena were almost in- Railway Postal Clerks stantly proven fraudulent, and no medium Men -Boys 18 Up Travel -See Your CountCy to contradict our findings. has dared Become Mail Carriers Postoffice Clerks In view of these facts, should we not con- all mediums fraudulent? Should we FRANKLIN INSTITUTE, Dept. P -179, Rochester. N. Y. sider Vacations Specimen Railway Postel every psychical manifestation Steady Work No Layoffs Paid Sirs: -Rush to me without charge. (1) not consider O Clerk Examination questions. (2) Send list of U. S. Govern - as being trickery pure and simple, intended Sufficient ment jobs now obtainable. primarily to fleece those who visit the circle Common Education j Naine and who find solace in the words from the worst forms of charlatans, namely those who MAIL COUPON TODAY SURE ;'Address .. are being permitted to practice upon the poor, seeking words from loved ones? We have $11.000.00 offered by this pub - you each month. Subscribe to Science & Inven- Iication and Joseph F. Rinn which will be Insure your copy reaching awarded wholly or in part to the one produc- tion -$2.50 a year. Experimenter Publishing Co., 53 Park Place, N. Y. C. ing a phenomenon devoid of trickery.

www.americanradiohistory.com 1150 Science and Invention for April, 1926 RADIO WRINKLES UNDER this heading we are going to publish items of interest to everyone who likes to build radio instruments. In order to continue this department it is nec- essary for our readers to tell us about their latest experiments. Write us a short de- scription of some time- or money- saving "There's kink you have discovered and send it to us the new I along with a few sketches. Our regular Bill Tyson" rates will be paid for this material. Be 112-Cell- 24 -Volt brief and try to put everything in the draw- Storage'B'Battery He's making $6500 a now ing. Don't be too elaborate. Address year Positively given free with each "RADIO WRINKLES" Editor, care of purchase of a WORLD A" "I USED to know him when I was a kid -we Storage Battery. Yon must went to grammar school together. SCIENCE AND INVENTION. send this ad with your order, "Then his WORLD Batteries are famous father died and he had to go to work. for their guaranteed quality Got a job with Brooks & Watson as a clerk, but and service. Backed by years couldn't seem Lb get ahead. of successful manufacture and thousands of satisfied users. "Then overnight something seemed to wake Equipped Rubber sran'eöeit acid leak- him up. He began making suggestions to the Socket age. You save.°fn per cent and gets firm- helped them to save a great deal of money. 2-Year Guarantee "Then Old -Man Brooks became interested WryORW I1ap - SOC. ET PIN Bond in Writing Approved wanted to know how Bill happened to know so "tell their friends." That's our pest proof ° HOLE IN or performance. Send your and Listed much about the business. I t order in today, Bill told him he'd been I ONE Solid Rubber Case Radio Batteries as Standard CLIP 100 studying at home at nights through the Inter- Ì^f -11 I 6-Volt. -Amperes . . . . . $11.25 13-Volt, 120 -Amperes. . . 13.25 by Leading national Correspondence Schools. 'H'm,' said Mr. 1; 11 1 6 -Vola, 140-Amperes 14 00 Authorties Brooks, 'I'll remember that.' INSULATING i TT rl l Solid Rubber Case Auto Batteries Sein TAPE &Volt, 11 -Pla e . . . . . $11.25 Labboore "He did too. Put Bill out on the road as a i 6-Volt, 13 -Plate 13.25 ories, Peputar L`.v1 t 12 -Volt. 7 -Plate 16.00 nos tand- salesman t for a year or so and then brought him money 'uat ataca bat ard Y into the office r------, send No Popular main as sales manager. SHAPE OF BENT we will ship_ order received, by EáEx- Ra dme Laaborrs- "He's getting $6500 a year now and everybody ASSEMBLY CONTACT press C. O pD. ubject to your examination tonics, Radio OF on arrival. FkEEbattery "B" tnc Broadcast Lab - calls him 'the new Bill Tyson.' I've never seen Extra Offer: 6 per cent discount forcash oratorlee Radio SOCKET in full with order. Buy now and get a guar -Yin the dome, such a change in a man in my life. I. C. S. Instead battery at 60 per cent saving you. and 1 -efes, lac. The BRASS STRIP to deserves a lot of credit." WORLD pt COMPAN An International BEFORE SHAPING 1219 So. Wabash v ILL. Correspondence Schools course Set your Radio Dial at will help you just as it helped Bill Tyson. It 210 meters for the new will help you to have the happy home -the big- 1000 w, World Storage ger salary -the comforts you'd like to have. World Battery Station, WSBC, STORAGE Chicago. Watch for an- Start today to make good. At least find out A very good type of low loss socket that is BATTERIES nouncements. what this great school can do for you. easy to make and that will give exceptional 077=1, _. IÉtL yYlSsKt( RrxnvanrWr -,,WJY 'KOj Mail the Coupon for Free Booklet results is illustrated above. This can be adapted to any type of tube. When a Bake - INTERNATIONAL CORRESPONDENCE SCHOOLS lite base type tube is employed, the insulat- Box 6239 -D,, Scranton, Penna. ing tape will not be found necessary. Oldest and largest correspondence schools in the world The Without cost, please socket pin hole is drilled in only one of the tell me how I can qu - '.ify for the position or in the ai:b,ect before which I have marked au ät clips.- George A. Luers. BUSINESS TRAINING COURSES Business Management []Salesmanship Industrial Management Advertising Personnel Organization Better Letters Traffic Management Show Card Lettering Neat Connections Business Law Stenography and Typing Banking and Banking Law Business English Accountancy (including C.P.A. ) O Civil Service Nicholson Cost Accounting Railway Mail Cleric Bookkeeping Common School Subjects Private Secretary High School Subjects Spanish El French Illustrating TECHNICAL AND INDUSTRIAL COURSES Electrical Engineering Architect Electric Lighting jArchiteeta' Blueprints Mechanical Engineer Contractor and Builder ]Mechanical Draftsman Architectural Draftsman Machine Shop Practice Concrete Builder Railroad Positions JASCHA GUREWICH Structural Engineer Smoll..e Vireo's Gas Engine Operating Chemistry Pharmacy f.,-nlr rc¡ry 8.4 H.Civil Engineer Automobile Work can play Surveying and Mapping Airplane Engines 'ou Metallurgy Mining Agriculture and Poultry Steam Engineering Radio Mathematics To make very neat and efficient connections, this easy fingering Buescher Saxophone. Name remove the insulation from the wires to be Most wonderful music. 3 lessons given on Street 6 -26 -25 joined, bend the one that is to be tapped as request with each newBuescherTrue-Tone. Address at A; slip a washer over it and the end of Teach yourself. Many play scales right off- - the other wire through the loop as at B easy tunes first week. You can. City State and sweat solder into the entire assembly as at C.- William H. Lee. to Pay an Occupation Easy to Play, Easy If pou,reside in Canada, send tria coupon to the Interna- Tryany Buescherinstrumentfor6 days. Satisfaction tional Correspondence Schools Canadian Limited, Montreal or no sale. Easy terms arranged. Send postal for cat- alog and details of trial and payment plans. Mention Charging Panel instrument preferred. No obligation. Send today. BUESCHER BAND INSTRUMENT CO. LIGHT 5W FIL. SW, 1534 Buescher Block Elkhart, Indiana 'B BATT. F LAMENT VOLTMETER. E. V. VOLTMETER LEARN TENOR BANJO The automobile field needs trained LAMP $11 BANJOISTSI men. Big -pay jobs are -open. Auto me- Earn big money through chanics earn up to $75 a week. Train yourself TO Charles McNeil's famous Home Study for one of these big -pay jobs with the aid of STORAGE Banjo Course. Simple as A B C- books. They these BATT. yet has all technical requirements. tell everything you have to know. Includes phonogronla records, demon- SENT FOR IO DAYS' FREE EXAMINATION strating jazz strokes, "breaks" and Examination is absolutely TO RADIO chords, played by Charles McNeil, 5 free, I understand. All B years with Isham Jones-Brunswick shipping charges are paid by you and I do not pay a SET Rec- cent sinless I keep the books. orda. Easy payments. Send for MCGRAW -HILL BOOK CO., Inc., t222V.B Free Book. 370 7th.Avenue, N. Y. CHARLES McNEIL, Director. Chicago Send Tenor Banjo me the Practical Automobile Library for 10 -days' +90V. B Institute, Dept. 1954 free examination. If I decide to keep the books, I agree 1621 N. Lincoln St., Chicago, Ill. to send you $1.50 in 10 days and $2.00 a month until the METER SWITCH full price -$13.50-is paid. If I do not want to keep the FILAMENT AMMETER set, I will return it at your expense. Name The diagram above shows a simple type of 500 TRICKS battery testing panel. Meters and switches Be Popular I earn to Ertertzin! Address ... - - are supplied so that a constant check can be Fool Your friends. Earn money at Clubs Position - kept on all of and Parties. Easy to learn. No skill re- the batteries. A six -volt lamp quired. Write today for Company Free 64 -page S&I 4 -I -26 mounted on the switchboard serves to illumi- Illustrated Book that explains 33 Trick; nate the instruments. The "B" battery may you can do, together with Catalog of 500 Tricks, Puzzles, Jokes and European Nov - GET READY FOR BIG -PAY AUTO JOB be tested in sections by manipulating the cities at lowest prices- Enclose 4c postage. . switch.- Author please send address. LYLE DOUGLAS. Sta. A -3. Dallas, Tex.

www.americanradiohistory.com Science and Invention for April,1926 1151

Can the Dead Be Re-united ? By HUGO GERNSBACK (Continued from page 1089)

The fastest thing we know of on earth is light. It may be doubted that there is any - thing faster than light, although some scien- tists believe that gravitation travels faster. SINCE its extra cost, when spread over It would take a beam of light traveling at the rate of 186,500 miles per second, one minute and 54 seconds to trayel the distance these its billions of output, figures to but souls would occupy, providing they were in line, close to each other and measured three cents per package of twenty, it only one -eighth of an inch in their largest dimensions. If we assume that the souls can not imme- is quite fair to say that Fatima, in diately communicate with each other, we may liken the problem to taking a bottle and between `costly' and `popular' in price, throwing it into the ocean, in the hope that another bottle thrown into the ocean at the same spot two or more years later will meet is decidedly more popular than costly the first one. What are the chances? They may be stated as follows: If a bottle 4 5/16 inches in diameter were thrown into the Atlantic Ocean, which has an area of 41,321,000 square miles ; there would be one chance in 115,096,336,640,000 of finding it. . We may explain this in another way, as follows : If your vision were restricted to an area of the diameter of 4 15/16 inches, and you looked in eleven places, it would be just as easy for you to find that bottle dropped at random into the Atlantic Ocean, as it would be to communicate with one of the souls which have passed into the Great Beyond. In other words, the chance would be practi- cally nil. We may explain it in still another way, as follows:

$.000.00,$11,000.00 Challenge SCIENCE & INVENTION and Joseph F. Rinn will pay this amount for positive dem- onstration before our experts of spirit mani- festations, ectoplasm, spirit slate writing, et cetera. Read details of our challenge in August, 1923 issue of SCIENCE & IN- VENTION. "What a whale of a difference just a few cents make" Take a pyramid of hay, measuring 300 feet square and 900 feet high. It would be just as easy to find a needle two and a half inches long in this pyramid as to find a soul that has passed on. Again, the man of religion will tell me that all these figures meaningless, j- .$RITTE are be- ä,I i 2-YEqq \ cause he will say that once you are dead MO page GUARANTEE you are dead a long time, as the popular saying goes. As a matter of fact, as I have Reference mentioned in previous writings, there is no -R(BAtfÈpY!'y such thing as time in empty space. For that Book Battery Prices reason it would not make any difference SMASHED! how long it would take for two souls to re- To Consumers Only ,151:111521 Here is a real battery quality, unite, even with these tremendous handicaps. '' 1.2111 guaranteed to you at prices Even though there were not one chance in a that will astound the entire bat- tery- buying public. Order Di- billion trillions of finding a certain soul, if rect From Factory. Put the we Dealer's Profit in your own pock- allowed enough time, say a billion trillion et. You actually save much more years, the two souls would, in the end, cer- than half, and so that you can be tainly meet, because, infinite convinced of true quality and perform- given time, the qP; ance we give a Written 2- Year Guaran- chances of meeting naturally - tee. here 1s your protection! No need to become unlim- Mailinq take a chance. Our battery is right - and ited. the price is lowest ever made. Convince is yourself. Read the prices! It also interesting to note here what the List t, Auto Batteries Radio Batteries mass of the ten trillion human 6VoIt,11 Plate, $8.50 6Voit,100Amp. 58.50 beings who Plate, 6olt,120 AMP. Cataloq 6Voit,18 1 0.25 10.25 have died during the last 250,000 years would 12Volt, 7Plata. 11.75 6Voit,140 Awe. 511.75 look like. For purposes of illustration, Buy Direct -Send No Money I No.55 We ask no deposit. Simply send name and ad- have had the following data computed: ee d style wanted. iy dariyo derEpressoé x V.ñ Mount Everest, the highest peak on earth, Get Business by Mail subjecterr t y semíta on Ì Ougbatterer is 5/ miles high, and has never been scaled. 60 pages of vital business facts and adieeouat y. figures. Who, where and how many We appoawn e5 If we were to take all of for cash in full with or- 11aa,1-,-7",t°`'z the bodies of the your prospects are. der. You cannot Mee! human beings who have died for 250,000 8,000 lines of business covered. Com- order today piled by the Largest Directory Publish- -NO your years, and arrange them in the form of a ers In the world, thru information ob- ARROW co. Dept. 1 AT Ï2R5. pyramid, we would create a mountain that tained by actual door -to -door canvass. Wabasn Aye.,Chicage yARRpR, would dwarf into insignificance Mount Ever- Write for your FREE copy. R. L. POLK & CO., Detroit, Mich. est. The pyramid would be 19/ miles high, 880 POLK DIRECTORY BLDG. and would have Branches in principal of U. S. -- a base of 6/ miles, a struc- cities ture so large that it staggers the imagination.

www.americanradiohistory.com 1152 Science and Invention for April, 1926

CHICAGO Broadcast Calls TECH N ICAL (Corrected to date) COLLEGE Power Call & Wave Letters Location and Name Length Drafting' KDKA East Pittsburgh, Pa., Westing- house Electric & Mfg. Co. Variable -309.1 Engineering KDLR Devils Lake, N. D., Radio Elec- tric Co. & Wilson Insurance Patrick Conway 'Electricity Agency 5-231 ameus band- KDPM Cleveland, Ohio, Westinghouse master uses eni es and Architecture Electric & Mfg. Co 500 -250 KDYL Salt Lake City, Utah, New- 22nd Year] house Hotel 50-246 Your Talent, No KDZB Bakersfield, Calif., Frank E That longing to play some instrument, to GAMAXIMUM of practical Siefert 100 -209.7 KFAB Lincoln, Neb., Nebraska Buick express yourself in music, can be quickly training in a minimum of time Auto Co. 1000 -340.7 and easily gratified. Choose any Com in- is offered you by one of "America's KFAD Phoenix, Ariz., McArthur strument, you'll win pleasure and profit in Bros. Mercantile Co. 100 -273 the shortest time. Remember Conn is oldest and largest schools of special- KFAF San Jose, Calif., Montgomery the Hotel 50 -217.3 only maker of every instrument for the band. ized engineering" . . technical train- KFAJ Boulder, Colo., University of Endorsed by foremost artists for beauty of tone, ing of college standard for men who Colorado 100-261 perfect scale, reliable action. KFAU Boise, Idaho, Boise High FreeTriai; Easy Payments. Write have neither the time, money nor School 750 -280 -2 for free book "Success in Music" preliminary education a KFBB Havre, Mont., F. A. Buttrey and details of trial offer. Mention to attend & Co. 50-275 instrument. university. Over 1000 men enroll KFBC San Diego, Calif., W. K. Azbill 10 -324 C. G. Ltd. KFBK Sacramento, Calif., Kimball - CONN, each year in day and evening classes. Upson Co. 100 -248 456 Conn Bldg., Elkhart, Ind. KI BL Everett, Wash., Leese Bros 100 -224 Short, Intensive Training KFBS Trinidad, Colo., School District No. 1 15 -238 of a very practical sort puts you immedi- I {FBU Laramie, Wyo., The ately high Cathedral into a salaried position. Many (Bishop N. S. Thomas) 50 -270 BAN D of our students are assisted to responsible KFCB Phoenix, Ariz., Nielson Radio INSTRUMENTS positions before graduation earn Supply Co. 100 -238 woun. u,CE.. M,.Ne..r.,,.E" ... they KFDD Boise, Idaho, St. Michaels Ca- while they learn. thedral 50 -278 Chicago Technical KFDM Beaumont, Tex., Magnolia Pe- College Bldg. troleum Co. 500 -315.6 KFDX Shreveport, La., First Baptist Church 100 -250 KFDY Brookings, S. Dak., South Da- High School kota State College of Agri- If you can't culture and Mechanic Arts 100 -273 Course in KFDZ Minneapolis, Minn., Harry 0 come to Chicago Courses are arranged Iverson 10-231 2 Years KFEC Portland, Ore., Meier & STUDY to suit your needs: 2- Frank Co. 50 -248 IThis simplified, complete High School AT HOME year diploma; 3 -year KFEL Denver, Colo., Winner Radio Course -specially prepared for home study Ten months from today Corp. 50 -254 by leading professors -meets all require- you can be trained B. S. degree; special entrance to college, business, and KFEQ Oak. Nebr., Scroggin & Co ments for ..Trained men leading draftse In demand...at high short courses adapted professions. Enter pro- Bank 500 -268 fession, ithout sac-ass to the individual. In- KFEY Kellogg, Idaho, Bunker Hill & 20 Other Over 200 noted Engineers, Bue- rificing time. Study Sullivan Mining & Concen- inesetien,and Educators helped structors are experts, Courses prepare the special instruction actively at work in the trating Co. 10 -233 which you need for success. No matter what In your spare time...We KFFP Moberly, Mo., First Baptist your Inclinations may be, you can't hope have bg giving technical very professions they red training. Let for Church 50 -242 to succeed wi_Soat epeeial' teach. Tuition is low, terms KFFY Alexandria, La., Louisiana Col- were you the practical training you need. thes me instructors astis easy. Enter any time. lege the resident school. 50 -275 American School KFGC Baton Rouge, La., Louisiana Drexel Ave. R. 58th Street FREE TRIAL Write for Free State University 100 -268 Dept. H. 426 Chicago LESSON 72 -Page Blue Book KFGH Stanford University, Calif , Money Back When You Finish If Not Satisfied To see how much you will Leland Stanford Junior Uni- like t high -grade pro - It tells about the versity 500 -270 and 58th St., Chicago i1s American Scheel, Dept H. 426 Drexel Ave. courses (full descrip- KFGQ Boone, Iowa, Crary Hardware Send me full Infarmatton on the subject chocked and FREE OUTFIT Co. 10 -226 how you will help me win success In that line. $25 draftsman's tions); about the great oregularfit ncluded in the KFII Wichita, Kan., Hotel Lassen Architect Electrical Engineer price of the course. demand for Chicago Rigby -Gray Hotel Co 50-268 Building Contractor G I Education Technical College KFHA Gunnison, Colo., Western State Automobile Engineer Lawyer Send for trained men; about College of Colorado 50 -251 Civil Engineer Mach. Shop Practice 40 -Page Book KFHL Oskaloosa, Iowa, Penn College 10 -240 Structural Engineer MechanicalEngineer of facts about drafting... college athletics and Los Manager Steam Engineer d for it...free. Write KFI Angeles. Calif., Earle C. Dustiness to day for the Free trial other interesting facts Anthony (Inc.) 3000 -468.5 C. P. A. & Auditor Sanitary a Heating lesson In drafting,drafting sample Surveyor a Mapping drawings made stu- you'll want to know. KFIF Portland. Ore., Benson Poly- Bookkeeper dents the book In- Send for the Blue Book technic Tnstitute 100 -248 Draftsman & Designer High Scheel Graduate formed... re°A s Dept 445 now, without obligation! KFIO ' Spokane, Wash., North Central Address High School 100-265.3 Name KFIQ Yakima, Wash., First Metho- dist Church 100 -256 Address Chicago T ECH NI CAL College KFIU Juneau, Alaska, Alaska Elec- tric Light & Power Co 10 -226 59, VIII East St., Chicago KFIZ Fond du Lac, Wis., Daily Com- BUY DIRECT Dept. 26th monwealth and Wisconsin Radio Sales, Inc. 100 -273 SAVE HALF KFJB Marshalltown, Iowa, Marshall GRADE A Electric Co. 10 -243 O QUALITY KFJC Junction City, Kansas, Episco- GOODS l`or When a better PHOTO -ELECTRIC CELL 'pal Church (R. B. Fegan) 10-218.8 KFJF Oklahoma. Okla., National Ra- at WHOL ESAE FREE is announced it will bear the trade -mark dio Mfg. Co. 500 -261 Any handy man can install his own plumbing and BOOK KFJI Astoria, Ore., Liberty Theatre 10 -246 heating, by our new, easy KFJM Grand Forks. N. Dak., Univer- method. FREE installing sity of North Dakota 100 -278 plans show you how. You KFJR Portland, Oregon, Ashley C. save waste and high labor PHOTOTRON Dixon & Son 50 -263 cost with our cut -to -fit system. Fifty years of can only service to home owners, fanners, KFJX Cedar Falls. Iowa, Iowa State bailete s and mechanics. Million dollar The new, sensitive, and practical alkali - Teachers' College 50-258 plants behind our guarantee. FREE BOOK shows everything in Plumbing and heating KFJY Fort Dodge, Iowa, Tunwall fixtures and supplies. Write today for coPy. metal tube for picture telegraphy and a Radio Co. 50 -246 HARDIN -LAV1N COMPANY ESTADLtaH6D thousand other uses. KFJZ Fort Worth, Tex., South -West- 104 -14 West Pershing Road, Chicago, III. íg79 ern Baptist Theological Sem- inary 50-254 /STAMYou can be quickly cured, if you FOR DESCRIPTIVE 20¡(19, KFKA Greeley, Colo.. Colorado State LITERATURE WRITE 2V- ea. Teachers' College 50 -273 KFKU Lawrence, Kans., University of ELECTRIC CORPORATION Kansas 500 -275 STAMMERMER PHOTION KFKX Hastings. Nebr.. Westinghovse Pend 10 cents for 288-page hook on Stammering and Stuttering, "Its Cause and Cure." how & Mfg. It tells I 247 Park Ave. 1269 Cochran Ave. Electric Co 5000 -238.3 myself after stammering 20 yrs. B. N. Bogue. New York City Los Angeles, Cal. (Continued on page 1153) 8127 Bogus Bldg., 1147 N. 111. St., Indianapolis

www.americanradiohistory.com Science and Invention for Ljri1,1926 1153

Power Call & Wave 40 DAYS FREE TRIAL Letters Name Location Length KFKZ Kirksville, Mo., F. M. Henry 10-266 GREATEST VALUE KFLR Albuquerque, N. Mex., Univer- $Z sity of New Mexico 100 -254 KFLU San Benito, Tex., San Benito EVER OFFERED r Radio Club 10-236 ICFLV Rockford, Ill., Swedish Evan- gelical Mission Church 100 -229 IMPROVED MICDßGRA RFLX Galveston, Tex., George R. Clough 10-240 'The Perfect ritingInstrument KFLZ Anita, Iowa, Atlantic Auto- mobile Co. 100 -273 Answers the purpose of both pen and pencil combined. KFMQ Fayetteville, Ark., University Its point is shaped like a fine lead pencil point and writes of Arkansas 750 -299.8 with ink free and easy without a miss. skip or blur. KFMR Sioux City, Iowa, Morningside The steady uniform flow of ink actually improves your College 100 -261 handwriting. Won't blot, scratch, leak or soil hands. KFMW Houghton, Mich., M. G. Sate - COMBINES THE BEST FEATURES ren 50-263 of pen and pencil. minus the weak points, of both plus KFMX Northfield, Minn., Carleton Col- improvements found in neither. The lead pencil lege 500 smudges, thepoiotbreaksandits writing /soon is obliter- -336.9 ated. Most fountain pens skip. scratch, flood, clog, KFNF Shenandoah, Iowa, Henry Field leak. blot. soil hands and clothing. The old stylo- Seed Co. 500 -263 graphic ink pencil dries up, balks, blots. writes heavy, KFOA Seattle, Wash., Rhodes Dept. flows unevenly and is never reliable. The Inkograph Store 1000-454.3 feeds as fast and uniform on the 20th page as it did RFOB Burlingame, Calif., KFOB inc. on the feat. (Albert Sherman) 50-226 CANNOT LEAK KFON Long Beach, Calif., Echophone Not the tiniest drop of ink will spill although one filling Radio Shop 500 -233 is sufficient to write thousands of words. KFOO Salt Lake City, Utah, Latter MAKES 3 TO 4 CARBON COPIES Day Saints University 250 -236 at one time with original copy in ink. Bear down as hard as you like. without fear of bending. spreading. KFOR David City, Nebr., David City injuring or distorting its point. Tire & Electric Co 100-226 RFOT Wichita, Kans., College Hill DRAWS LINES TO A RULER without smearing, smudging or blurring the paper. Radio Club (College Hill Use any color ink. Methodist Church) 50-231 KFOX Omaha, Nebr., Technical High REQUIRES NO BLOTTER The ink dries ea fast as you write, because the flow fa School 100 -248 fine. even and uniform. KFOY St. Paul, Minn., Beacon Radio PATENT AUTOMATIC FEED Service 50-252 Prevents clogging. No complicated mechanism to KFPL Dublin, Texas, C. C. Baxter clean or get out of order. A year's guarantee cer- 15252 tificate with full directions accompanies each Ink- KFPM Greenville, Texas, New Furni- Nó 17 A. Z ograph and is your absolute protection. STYLE The Execu- No. 20A.7 ture Co. 10 -242 AN INSTRUMENT OF REFINEMENT tive, an ebony The Big Chief. KFPR Los Angeles, Calif., Los An- black rubber, In appearance it is extremely attractive. Its made of high- geles County Forestry De- highly polish- beautifully highly polished finest quality of hard est quality red ed Inkograph rubber. its 14Kt solid gold point -and feed. gold rubber. a large partment 500 -230.6 of superb re- band on safety screw cap. gold self filling lever sturdy attrac- KFPW Carterville, Mo., St. Johns finement. [the and gold clip make it an instrument of distinctive tive Inko- E. choice of men elegance and refinement. The equal in sise, graph. M. Church 20-258 of affairs. workmanship and material of a $7, $S or $9 KFPY Spokane, Wash., Symons In- fountainyen. Also made in ladies size. vestment Co. 100 -266 SEND NO MONEY KFQA St. Louis, Mo., The Principia 100 -261 Your name and address and the style number of the Inkograph of your choice are sufficient. Pay KFQB Fort Worth. Texas. Search- postman $2.98 plus postage on delivery. light Publishing Co. 1000 -263 Specify if you want ladieá sise. When cash accompanies order Inkograph will be sent post- KFQD Anchorage, Alaska, Chovin age prepaid. If within ten days the Inkograph Supply Co. 100 -227.1 does not prove satisfactory return it and we'll RFQP Iowa City, Iowa, George S. refund your money. Carson, Jr. 10-224 INKOGRAPH CO., Inc. KFQU Alma (Holy City), Calif., W. 37 -151 Centre St., - New York E. Riker 100 -217.3 KFQW North Bend, Wash., C. F. Knierim 50 -215.7 Illusfratiorts 1i/us/rations KFQZ Hollywood, Calif., Taft Prod- DEALERS ,Actual. Send for cata- ,Actual ucts Co. 50 -225.4 Size log and trade KFRB Beeville, Tex., Hall Brothers. 250 -248 prices. Size. KFRC San Francisco, Calif., City of STYLE * STYLE Paris Dry Goods Co 50-268 No. 6 A. 7 _AO 7 KFRU Columbia, Mo., Stephens Col- The X Ray Y The Rig lege 500 -499.7 Inkograph, / Chief. made of barrel made INKOGRAPH mottled rub- KFRW Olympia, W a s h., United of transparent The.l ACCOMPLISHIBNP ber which is Churches of Olympia 50 -218.8 amber material which Tbatl4Btaolid gold bard smooth round ball - black and red make. it possible to see rubber arils - KFSG Los Angeles, Calif., Echo Park how much ink it con- like point, which glides with eme over the tinily blended tains. Has large ink ca- coarsest paper and makes itpoesibletowritein producing w Evangelistic Assn. 500 -275 pacity. Filled with ink effect of extreme beauty dropper. not a self filler. ink as rapidly as with the softest lead pencil. and refinement. KFUL Galveston, Tex., Thomas Gog - gan & Bros. Music Co. 50 -258 Sell Inkographs make bigger profits, more salsa, without Inoss ment. Quloker commlaslons, popular KFUO St. Louis, Mo., Concordia Sem- prices, no competition. Send for an Inkograph or write for special sales plan booklet. inary 500 -545.1 AGENTS KFUP Denver, Colo., Fitzsimons Gen- eral Hospital 50-234 KFUR Ogden, Utah, Peery Building Co. 50-224 KFUS Oakland, Calif , Louis L. Sher- man 50-256 KFUT Salt Lake Cicy, Utah, Univer- WANTED sity of Utah 100 -261 KFUU Oakland, Calif. Colburn Radio Labs 50-220 MEN TO MANUFACTURE KFVD `San Pedro, Calif., McWhinnie METAL TOYS AND Electric Co. 50 -205.4 NOVELTIES KESTER KFVE St. Louis, M+.. Film Corpora- READY TO Use tion of America 500 -240 KFVG Independence, Kansas, First METAL MENDER Methodist Epis. Church 15 -236 Good chance to start your own well -paying business She Household Solder producing such big sellers as Toys, Novelties, Ash XFVI1 Manhattan, Kansas, Whan Ra- Trays, Book -blocks, Souvenirs, Advertising dio Shop 15 Special- -218.8 ties, Paper Weights, etc. We furnish forms with Here's why thousands use Soldering KFVI Houston, Texas, Fifty -sixth complete outfit for speedy production. Absolutely Kester Metal Mender. Booklet Headquarters Simple 0011F Brigade, no experience or tools necessary ; no special place -"Requires a Troop 10-240 needed. Small investment puts Heat "Anyone can use it. "It's you on road to suc- Safi -No messy pote or Cinch to KFVN Welcome, Minn., Carl E. Bag- cess. Demand exceeds supply and we assist you and dangerous acids. Solder`, ley 50-227 co-operate with our manufacturers in selling their Sure Genuine Solder Upon KFVR Denver, Colo., (near) Moon- products. We put you in touch with the buyers makes- firm metal joints. Request light Ranch, Route 6, Eu- and assure an outlet for your goods. Strictly a Satisfactory- W or ks business proposition and equally well on tight or gene Rossi 50-244 thorough investigation in- heavy. old or new work. KFVS Cape Girardeau, Mo.. Cape Gir- vited. A splendid opportunity for an enormous and Economical -Saves ardeau Battery Station, profitable business for ambitious men. No others Os- need many times its price. car C. Hirsch 50-224 apply. Catalog and information mailed Your Dealer Cats KFVW San Diego, Calif., Airfan Ra- on request. Supply You dio Corp. 500 -246 KFVV METAL CAST PRODUCTS CO. Albuquerque, N. Mex., Radio 1696 Boston Road, New York CHICAGO SOLDER COMPANY Supply Co. 10-250 4201.341 WrighrwoodAve.,Chicago, Ú. S. A.

www.americanradiohistory.com 175, Science and Invention for April, 192Ù Power Call & Wave Letters Name Location Length Eleetrical Electrical Electrical KFWA Ogden, Utah, Engineering Engineering Browing Bros. Engineering Co. 500 -261 KFWB Hollywood, Calif., Warner Armature Bros. Pictures (Inc.) 500 -252 Winding KFWC Upland, Calif., L. E. Wall 50 -211.1 KFWF St. Louis, Mo., St. Smne t (o Louis rramiemer Truth Center 250 -214.2 KFWH Chico, Calif., F. Wellington AGenerel Reference ark Morse, Jr. 100 -254 KFWI South San Francisco, Calif , mete eew.e Direr. C( Four Big Radio Entertainments (Inc ) 500 -226 amom KFWM Oakland, Calif., Oakland Edu- -É ryt Volumes cation t °Dsitn Commilem Society 500 -206.8 r. 54nalinr.5iwtb. Smtilms. KFWO Avalon, Calif., Lawrence Swi ation Name, Shipped max. We alimt. Mott 250 -211.1 KFWU Pineville, La., Louisiana Col- Illustrated with over ono FREE IhouNnd engraving. lege 100 -238 No KFWV Portland, Ore., Wilbur Jer- ADVANTAGES 91a ck Flexible Fabricotd man rad ng. surnped in Gold Deposit 50 -212.6 KFXB Big Bear Lake, Calif., Bert- OVERLOOKING BELMONT ram O. Heller 500 -202.6 KFXC Santa Maria, Calif., Santa YACHT HARBOR AND Maria Valley R. R. Co 100 -209.7 LINCOLN PARK GOLF ELECTRICITY KFXD Logan, Utah, Service Radio Co. 10-205.4 COURSES KFXF and Colorado Springs, Colo., Pikes ANEW HOTEL-700 ROOMS How to Make it Pay Peak Broadcasting Co. . 500 -250 BIG! TFOELLIGUR BNIG B O O 3 KFXH El Paso, Texas, Bledsoe Radio OPENED EARLY IN 1924 HOKW Co. . 50 -242 KFXJ Denver, ALREADY FAMOUS FOR. Your future lies before you. Between the covers of Colot Mountain States these four big books, filled with money -making facts, Radio Distributors, Inc. ITS HOSPITABLE you may find the answer to all your problems. You will (Portable) 10 -215.7 find them a veritable gold mine of facts on electricity, KFXM Beaumont, Texas, Neches Elec- ATMOSPHERE facts which RAISE MEN'S PAY. No need to spend long hours in grinding study if you know where to find the tric Co. 10-227 things you want to know when you need them. KFXR Oklahoma, Okla., Classen Film SPECIAL Finishing Co. 15 -214.2 SHORT ROAD TO SUCCESS KFXY Flagstaff, Ariz. (Orplieum The- MONTHLY RATES There is a shorter road than years of study and exper- ience. Learn in an hour what someone else experimen- atre), Mary M. Costigan 50 -205.4 WRITE FOR BOOKLET ted on for a year. Let him tell you how he did it, look at KFYF Oxnard, Calif., Carl's Radio the drawings others have made and learn from them. Den (Newcomb Radio Co.) 10 -205.4 It's easy if you have these special volumes arranged for ready reference. These books were published for busy KFYJ Houston, Tex., Houston Chron- 6J .Billingsley men. men who want to get ahead with the least waste icle Publishing Co. (Port- .4anOOer of time. You'll find them a big help no matter what your able) 10 -238 present job or station in life. KFYO Texarkana, Tex., Buchanan - COMPLETE IN EVERY WAY Vaughan Co 10 -209.7 4-volume Electrical KFYR Bismarck, N. Dak., Hoskins - we have haver published. value eve (beenoffered i interesting instructive subjects, Meyer, Incl. 10-248 hundreds of drawings, a printssant d photographs. :ne EGO Oakland, Calif., General Elec- tone array of pay-building material, but on simply told and eu easily understood 'hat anyone will enjoy them. Over 2000 pages tric Co. 4000 -361.2 bound in flex° covers. KGTT San Francisco, Calif., Glad Tid- AMAZING NEW PRICE ings Tabernacle .. , .... 50 -206.8 Never In our history have we offered ro great bargain. The KGU Honolulu, Hawaii, Marion A Pile. of only $9.90 for them ¡splendid books is something new in and we, therefore, reserve the right to withdraw Mulrony 500-270 thiexperience,n offer any time, after 80 days. KGW Portland, Ore., Portland Morn- SHIPPED FREE ing Oregonian 500 -491.5 Our plan bring. thews four splendid volumes within the reach of KGY Lacey, Wash., St. Martins Col- one. You don't send on a single peon a don't m .Re lege 50-246 aeveryn, depo,it withe ue -just send vous name endaodreno and we'll KHJ Los Angeles, Calif., Times- them carefully. Keepth m1e0 da s. then xená,only Ì.90ä`d Mirror Co. 500 -405.2 then $2.00 per month for only 4 months - there is nothing more to Lay ua, the books will be yours. KH Spokane, Wash, Louis Wasmer 500-273 winwimonswenawns KJB San Francisco, Calif., Julius AMERICAN TECHNICAL SOCIETY, Brunton & Sons Co. 5 -220 Automobile Division E425 Chicago, ill. KJR Seattle, Wash., Northwest Ra- NEW VEST POCKET You ay send m your complete Automobile Engineering dio Service Co. 1000-384.4 library,4 big olumee bound in flex° cover., with the under- standing that I are to have 10 days to decide if I want to keep KLDS Independence, Mo., Reorgan- hem. I will either return them then or send you $1.90 then and ized Church of Jesus Christ ADDING MACHINE $2.00 per month until the epeci.l low price of $9.90 is paid. of Latter Day Saints ..1000 -440.9 Adds-Subtracts -Multiplies -Divides ABYCALCdtATOR Does work of $300 machine. Guaranteed 5 Name KLS Oakland, Calif., Warner Bros. 'scars. NOT A TOY. Radio Supplies Co. 250 -250 Made of steel and indestructible. Billiton Address KLX Oakland, Calif., Oakland Trib- dollar capacity. Fits in pocket. Will not City State une 500-508.2 ®©.17®D.UB make mistakes. So simple child can operate KLZ Denver, Colo., Reynolds Radio sit. Everybody should carry one for figuring. Reference Co. 250 -266 KMA Shenandoah, Iowa, May Seed FREE & Nursery Co. 500 -252 TRIAL $21D5 ° KMJ Fresno, Calif., Fresno Bee 50 -234 SEND NO MONEY-Just name and ad- KMMJ Clay Center, Neb., M. M. John- dress. We will ship Calculator Immediately, Returns its Cost ADDITION On delivery Day postman $2.50 phis few son Co. 1000 -228.9 SUBTRACTION KMO Tacoma, Wash., Love Electric MULTIPLICATION cents postage ($3.50 cash outside U.S.). DIVISION f If not satisfied after 10 day trial you get Co. 100 -250 your money back. THOUSANDS OF SAT- OVER°OVER KMOX Kirkwood, Mo., Voice of St ISFIED USERS. This is lowest priced practical calculator r made. "Why pay more for inferior imitations ?" Order Louis, (Inc.) 1500-280.2 from this ad. f The "Trousers' Friend" Ai (St. Louis, Mo.) n -Write for big commission nod ter - BEsIFONGRE This scientific device made of AFTER KMTR Los Angeles, Calif., K. M. Tur- AGENTS iiltory proposition. USING Baby 1118, Chicago, III. Dept. 22 TROUSERS everlasting steel, nickel plated, TROUSERS ner Radio Corp. (Oliver S Calculator Sales Co.,P.O.Bx. FRIEND Positively removes baggy knees FRIEND Garretson) 500 -238 and automatically preserves KNRC Los Angeles, Calif., Clarence the creases without pressing, without dampening and so B. Juneau 250 easily that anyone can adjust it in a moment. Hang -208.2 KNX Los Angeles, Calif., Los An- y your trousers in a "Trousers' Friend" in the evening S ANY BOOK and pot them on snick and snan in the morning. Takes geles Evening Express..1000 -336.9 .l.hDU very little room in grip. Works equally well at home, KOA Denver, Colo., General Elec- .çitle in Hotel or Pullman. tric Co. 5000-322.4 ofC IN PRINT Order One To -Day; Send No Money KOAC Corvallis, Oregon, Oregon Ag- at your door. We pay the Pay the Postman $1.75 and postage. Use It thirty days. postage. Standard authors, fine edi- If not satisfactory your money returned. If you remit ricultural College 500 -280.2 all át biggest 'with order we pay postage. KOB State College, N. M., New tlons, new books, sáv NELSON MANUFACTURING COMPANY Mexico College of Agricul- Clarkson's catalog. 55 New Montgomery St. San Francisco ture and Mechanic Arts..1000 -348.6 for our great book cat- Secure An Agenev: The "Trousers' Friend' is filling KOCH Omaha, Neb., Omaha Central ¡cc FREE alogWrite This catalog iu a short s World need. We want you to present it to millions .lest' course in literature and rs eo used Waiting for it. Write to-day. High School 250 -258 \ Pr leading Universities; ..CI by some of America's KOCW Chickasha, Okla., Oklahoma 500.000 hook lovers buy from it. Free if you write now. College for Women 200 -252 Agents ROIL Council Bluffs, Iowa, Monarch DAVID B. CLARKSON BREOKER Mfg. Wanted Co. 500 -278 451 CLARKSON BUILDING, CHICAGO. ILL, Use and ln- KOWW Walla Walla, Wash., Blue Mountain Radio Association FLYYoung man, learn aviation. (Frank A. Moore) 500 -256 Build this classy plane and 15 000 GUARANTEEDGUMAER`LOERS KPO San Francisco, Calif., Hale learn to construct and oper- Lowest Wholesale Prices in Amer- Bros. 1000 -428.3 \ate aircraft. Use your motorcycle ica. Shipped prepaid on approval. Make engine or our "Meteor" 20 h.p. big money all or part time. No capital or KPPC Pasadena, Calif., Pasadena Pres- motor. We furnish parts very rea- experience. Sample sections furnished. byterian Church 50 -229 - sonable to build this wonderful YOUR TIRES FREE! KPRC Houston, Texas, Post Dis- little "Meteorplane" the World's FREE first successful. Light Plane. huellaeandedo ter Sseelgsetth patch 500-296.9 Send $3.50 for complete set of Offer, Wholesale Prices and rRrE Sample a16 KPSN Pasadena, Calif., Pasadena Star blue prints and parts price MELLINGER TIRE & RUBBER CO. News 1000 -315.6 / list of this latest Model M-T -2. Dept. 411 Philadelphia,Pa.,or Kansas IRWIN AIRCRAFT COMPANY KQP Portland, Ore., H. B. Read 500 -212.6 _-%' 130.0- Street, Sacramento, Calif.

www.americanradiohistory.com Science and Invention for April, 1926 1155 Power Call & Wave Dingle Letters Location and Name Length Captain KQV Pittsburgh, Pa., Doubleday - Hill Electric Co. 500 -27$ America's foremost author of sea stories, KQW San Jose, Calif., First Baptist Church 500 -231 tells a story of gripping mystery, intrigue, KRE Berkeley, Calif., Berkeley Daily Gazette 100 -256 and blood -stirring action KSAC Manhattan, Kans., Kansas State Agricultural College . 500 -340.7 KSD St. Louis, Mo., Post Dispatch 500 -545.1 KSL Salt Lake City, Utah, Radio Service Corp. of Utah ....1000-299.8 The Sea Schemers KSO Clarinda, Iowa, A. A. Berry Seed. Co. 500 -242 You'll find it complete in the April KTAB Oakland, Calif., Tenth Avenue Baptist Church 1000 -240 KTBI Los Angeles, Calif., Bible Inst of Los Angeles 750 -293.9 ON OUT KTBR Portland, Ore., Brown's Radio Shop 50 -263 His Salary TODAY KTCL Seattle, Wash., American Ra- All dio Telephone Co. 1000 -305.9 KTHS Hot Springs, Ark., New Ar- Was Raised STANDS 25c lington Hotel Co 500 -374.8 KTNT Muscatine, Iowa, Norman while others were reduced Stories Baker 500 -256 "Up to the time I enrolled for a course Thrilling Pioneer, Adventure, & Mystery KTW Seattle, Wash., First Presby- with the International Correspondence terian Church 1000 -454.3 Schools, I had only a grade- school edu- KUO San Francisco, Calif., Exam- cation. Since enrolling, I have advanced Old Color Blind iner Printing Co. 150-250 to a much better position, where my KUOM Missoula, Mont., University of salary is nearly four times as much as I all the romance of railroading Montana 250 -244 was making previously. I. would not be By ARTHUR GUY EMPEY KUSD Vermillion, S. D., University of able to hold my present position had I South Dakota 100 -278 not taken your Course. Recently I re- KUT Austin, Texas, University of ceived a nice increase in salary, while Texas 500 -231 other men were being reduced." Goes West KVOO Bristow, Okla., Voice of Okla- Read that last sentence again -"Recently I re- The Line homa 500 -374.8 ceived a nice increase in salary, while other men clash of mighty men on an old frontier KWCR Cedar Rapids, Iowa (H. F were being reduced." the Paar) 500 -278 There could be no better proof of the value of an E. LEGNER KWG Stockton. Calif., Portable Wire- I. C. S. course than that. It shows that the trained By LOUIS less Telephone Co. 50 -248 man is given preference over all others and paid KWKC Kansas City, Mo., Wilson more money, even in slack times, if his work de- Duncan Studios 100 -236 serves it. It shows that there are always bigger, 15 other big stories and features KWKH Kennonwood, La., W. G. Pat- better jobs open for men who have the foresight to terson 500 -261 prepare for them in spare time. Why don't you study and get ready too? We'll Minn l KWSC Pullman, Wash., State College I FAWCETT PUBLICATIONS, Inc., Robbinsdale, of Washington 500 -348.6 be glad to help you if you will only make the start. Enclosed find $1 (in cheek or money order) for which KWWG Brownsville, Texas, City of Choose the work you like best in the coupon I please enter my name as a subscriber to your special C. S. which please Brownsville, Board of City below; then mark and snail it to the I. five months offer. Or enclosed find 25c for today. This doesn't obligate you in the least, but send me one copy of the April issue of TRIPLE -X. Development 500 -278 KYW it will bring you information that will start you on Chicago, Ill., Westinghouse a successful career. This is your opportunity. Name Electric & Mfg. Co. 3500 -535.4 KZIB Manila, P. I., I. Beck (Inc.) 20 -249.9 Mail the Coupon for Free Booklet Address I KZKZ Manila, P. I., Electrical Sup- City State S &I ply Co. 100 -270 INTERNATIONAL CORRESPONDENCE SCHOOLS KZM Box 6238 -D, Scranton, Penna. Oakland, Calif., Preston D correspondence in the world Allen 100 Oldest and largest schools -240 Without cost, please tell me how I- can qualify for the KZRQ Manila, P. I., Manila Hotel, position or in the subject before which I have marked an X: Only $5 Down Far Eastern Radio (Inc.) 500 -222 BUSINESS TRAINING COURSES KZUY Baguio, P. I., F. Johnson Elser 500 -360 Business Management Salesmanship NAA Arlington, Va., United States Industrial Management Advertising Navy Department 1000 Personnel Organization Better Letters Buys Any WITTE -434.5 Traffic Management Show Card Lettering WAAD Cincinnati, Ohio. Ohio Me- Business Law Stenography and Typing Latest Model chanics Institute 25 -258 Banking and Banking Law Business English WAAF Chicago, Ill., Chicago Daily Accountancy (including C.P.A.) Civil Service Drovers Journal Nicholson Cost Accounting Railway Mail Clerk All -Fuel Engine TS 10 H -P. 200 -278 Bookkeeping Common School Subjects WAAW Omaha. Neb., Omaha Grain Private Secretary High School Subjects The One -Profit Engine. Sold Direct From Factory To Tou. Exchange 500-278 Easy Terme best Burns Kerosene, Spanish CI French Illustrating on engine built. WABB Harrisburg, Pa., Harrisburg TECHNICAL AND INDUSTRIAL COURSES Distillate. Gas -Oil, Gasoline or Gas. Change power Radio Co. 10 -204 Engineering Architect at will. Equipped with the famous WICO Mag- WABC Asheville. N. C., Asheville Bat- Electric Lighting Architects' Blueprints neto, speed and power regulator and throttling tery Co. 20 -254 Mechanical Engineer Contractor and Builder governor. 2 to 25 horsepower ALL STYT.F,S. WABI Bangor, Me., First Universal- Mechanical Draftsman Architectural Draftsman today for my Big Engine Machine Shop Practice Concrete Builder ist Church 100 -240 Railroad Positions Structural Engineer FREEWriteBook. Sent free -no obligation WABO Rochester, N. Y., Lake Avenue Gas Engine Operating Chemistry Pharma4 on your part. Or, if interested. ask for our Log Baptist Church 100 -278 Civil Engineer Automobile Work and Tree Saw, 3 -in -1 Saw Rig or Pump Catalogs. WAEQ Haverford, Pa., Haverford Col- Surveying and Mapping Airplane Engines WITTE ENGINE WORKS Metallurgy Mining Agriculture and Poultry lege Radio Club 100 -261 Steam Engineering Radio Mathematics 3757 Witte Building, KANSAS CITY MO. WABR Toledo, Ohio, S c o t t High 3757 Empire Building, PITTSBURGH, PA. School 50 -263 Name WABW Wooster. Ohio, College of 6 -28 -25 OF THESE NOW Wooster 50 Street GET ONE -206.8 Address ERE is a hand ejector that has them all beat. WABX Mount Clemens, Mich. (near), jv Henry B. Joy 500 Not to be compared with other guns at -246 City State MILT WABY Philadelphia, Pa., John Magal- di, Jr. 50 -242 $9.65 WABZ New Orleans, La., Occupation Coliseum If you reside in Canada, Bend this coupon to the Interne- this price. Best ob- Place Baptist Church 50-275 linnet Correspondence Schools Canadian Limited. Montreal tainable and guaran- e1L WADC Akron, Ohio, Allen Theatre 500 -258 teed to fire accurately. WAFD Port Huron, Mich., Albert B Coil Spring S h o o es standard Parfet Co. 500 -275 ammunition. Solid frame WAGM Royal Oak, Mich., Robert L. swing out cylinder. Beat Miller 50 -225.4 Moth 13a11 Holder blue steel. New 1926 models. Order now. WAHG Richmond Hill, N. Y., A. 32.20 H A HANDY SPIRAL CONTAINER or 38 cal. Only $9.65. Satisfaction Grebe & Co. 500 -315.6 guaranteed or money refunded. Pay on with removable cover. This simple WAIT Taunton, Mass., A. H. Wait device can be hung on clothes - Delivery plus Postage. SEND NO MONEY. & Co. 10-229 hangers or behind the door -iambs, UNIVERSAL 8ALES CO.. WAIU Columbus, Ohio, American In- where its action is very effective in 259 Broadway 87 w York. N. Y. surance 500 making the whole closet moth -proof. Union -293.9 A. box of moth balls will fill eight WAMD Minneapolis, Minn., Hubbard (8) holders. Price $1.50 per dozen. ß30O °° 7Dß500.` ). & Co. 500-244 Discount to agents in gross lots. WAPI Auburn, Ala., Alabama Poly- R. J. LEWERS M0 J REAL ESTATE Dusinr4 technic Tnst. 500 -248 1888 Cedar Ave. York WARC Medford Hillside, Mass., Amer- New City Get into the P.10 MONEY class. No ican; Radio & Research business, trade or profession offers such Corp. 100 -261 big returns. WATT Boston, Mass. (portable) Edi- Make $3,000.00 to $10.000.00 Yearly son Electric Illuminating We teach you the REAL ESTATE. IN- Co. of Boston 100 -243.8 SURANCE and GENERAL BROKER- WBAA West Lafayette, Ind., Purdue AGE business thoroughly by mall. fur- University 250 nish you big list saleable properties. -273 Wonderful, new help you start in business and annnint WBAK Harrisburg, Pa., Pa. State device, guides your hand; corrects your weiting in few days. Big improvement in three you member of our CHAIN of REAT. Police 500 -275 hours, No failures. ESTATE EXPERTS in your locality. WBAL Baltimore Md., Consolidated Write Complete outline FREE. Write trxlay for FREE booklet and full C. J. Dement. Dent. ea St. Louis. Mo. Information. Gas, Electric Light & Power Co. 5000 -245.8 Insure your copy reaching you each month. Sub- DAWSON REAL ESTATE CO., Inc.. Robert Dawson. Pres. scribe to SCIENCE & Suite 307, Merchants Nat'l Bank Bldg., Fort Smith, Arkansas (Continued on page 1156) INVENTION, $2.50 a year. Experimenter Publishing Co., 53 Park PL, N.Y.C.

www.americanradiohistory.com 1156 Science and Invention for April, 1926 Power Call & Wave Letters Name Location Length WBAO Decatur, Ill., James Millikin University 100 -270 WBAP Fort Worth, Texas, Wortham- Carter Publishing Co. (Star - Telegram) 1500-475.9 WBAX Wilkes- Barre, Pa., John H. Stenger, Jr. 100 -256 WBBL Richmond. Va., Grace Cove- Pictures that pay nant Church 100 -229 WBBM Chicago, Ill., Atlas Investment Co. 1500 -226 WBBP Petoskey. Mich., Petoskey High YOUR mind registers School 200 -238 hundreds of pictures every WBBR Rossville, N. Y., Peoples Pul- pit Assn. 500 -273 day. Faces on the street, people in a doorway, a WBBS New Orleans, La., First Bap- tist Church 50 -252 tray of watches in a window, ribbon on a hat. In- WBBW Norfolk, Va., Ruffner Junior High School 50-222 teresting or amusing, maybe ... but of what actual IVBBY Charleston, S. C., Washington Light Infantry 10-268 WBBZ Chicago, Ill. (Portable), C. L value are most of them to you? Carrell 50 -215.7 WBCN Chicago, Ill., Foster & McDon- a nell 500 -266 Yet vast number of pictures than can affect WBDC Grand Rapids, Mich., Baxter Laundry Co. 500 -256 your daily living are waiting for your glance. WBES Tacoma Park, Md., Bliss Elec- trical School Advertisements show you better things to ride in, New York, N. Y., Shirley Katz 500 -209.7 eat, wear, enjoy -honestly pictured for you. Pic- WBOQ Richmond Hill, N. Y., A. H. Grebe & Co 100 -236 WBPI Newark, N. J., I. R. Nelson Co 500 -263 tures that pay! Such pictures make you familiar WBRC Birmingham, Ala., Bell Radio Corporation 50-248 with the newest, most improved things you can buy. WBRE Wilkes Barre, Pa., Baltimore Radio Exchange 100-231 The soap, hosiery, fountain pen that can mean most \VBT Charlotte, N. C., Charlotte Chamber of Commerce . 250-275 to you. Familiar with their color, way they are WBZ Springfield, Mass., Westing- house Electric & Mfg. wrapped, name on the package. You can recog- Co. 2000 -331.1 WBZA Boston, Mass., Westinghouse nize them Elec. & Mfg. Co. 250 -242 at once, link them at once with their \VCAC Mansfield. Conn.. Connecticut Agricultural College 500 -275 advertised facts, know all about them before you WCAD Canton. N. Y., St. Lawrence University 250-263 buy. You don't have to test them. They have \VCAE Pittsburgh, Pa., Kaufmann & Baer Co. 500 -461.3 been tested for you. The watch widely advertised WCAJ University Place. Neb., Ne- braska Wesleyan University 500 -254 ticks in thousands of pockets. The skillet on the WCAL Northfield, Minn., St. Olaf College 500 -336.9 printed page is used on a thousand stoves. Pic- WCAO Baltimore, Md., Albert A. and A. Stanley Brager 100 -275 tures in advertisements are pictures of good things WCAP Washington, D. C.. Chesa- peake & Potomac Telephone Co. 500-468.5 enjoyed in countless homes. WCAR San Antonio, Texas, Southern Radio Corporation of Texas 500 -263 WCAT Rapid City, S. D., South Da- kota State School of Mines 50 -240 WCAU Philadelphia, Pa., Universal Broadcasting Co. (Durham & Co.) 500 -278 WCAX Burlington, Vt., University of Vermont 100 -250 WCBA Allentown, Pa., Queen City Radio Station 15 -254 WCBD Zion, Ill., Wilbur G. Voliva..5000 -344.6 \vCBE New Orleans, La., Uhalt Brothers Radio Co. 5 -263 Look at advertisements and their pictures WCBH Oxford, Miss., University of Mississippi 50 -242 They let you choose the best WCBM Baltimore, Md., Hotel Chateau 50 -229 WCBQ Nashville, Tenn., First Baptist Church 100 -236 WCBR Providence, R. I. (portable), Charles H. Messter 30 -205.4 WCCO Minneapolis, Minn., Washburn - Crosby Co. 5000 -416.4 WCEE Elgin, Ill., Liberty Weekly...1000-275 WCLO Camp Lake, Wis., C. E. Whit- more 50 -231 WCLS Joliet, Ill., H. M. Couch 150 -214.2 WCSH Portland, Me., Congress Square Hotel Co. 500 -256 WCSO Springfield, Ohio, Wittenberg totes Ttme5 square College 100 -248 WOWS Providence, R. T.,United States 255 West 43rd Street -Just West of Broadway (Portable) Chas. W. Selen.100 -209.7 NEW YORK CITY WCX Pontiac, Mich., Detroit Free Press 5000-516.9 "Around the Corner from Everything" WDAD Nashville, Tenn.. Dad's Auto Accessories (Inc.) 150 -226 This magnificent hotel located within a few steps of all the leading theatres, WDAE Tampa, Fla., Tampa Daily shops and transit lines, offers accommodations at the following rates: Times 250-273 \VDAF Kansas City, Mo., Kansas City Rooms with Running Water $2.00 Double Rooms with Running Water $3.00 Star 500 -365.6 WDAG Rooms with Connecting Bath $2.50 (2 Persons) Amarilla, Texas, J. Laurance Double Rooms with Private Bath.. $4.00 Martin 100 -263 Rooms with Private Bath $3.00 WDAH El Paso, Texas, Trinity Metho- (2 Persons) dist Church (South) 50 -267.7 No Higher Rates Excellent Service WDAY Fargo, N. D., Radio Equipment Corporation 50 -261 WDBC Lancaster, Pa., Kirk, Johnson & Co. 50 -258 Insure your copy reaching you each month. Subscribe to Radio News a WDBE Atlanta, Ga., Gilham- Schoen -$2.50 Electric Co. 100-270 year. Experimenter Publishing Co., 53 Park Place, New York City. WDBJ Roanoke, Va., Richardson -Way- land Electrical Corporation 50 -229

www.americanradiohistory.com Science and Invention for April, 1926 1157

Power , Call & Wave e 11611° I'LLTRAIN YOU IN 20 WEEKS Letters Name Location Length rainnoomer , FOR A BIG-PAY JOB IN WDBK Cleveland, Ohio M. F. Broz /MLITT Furniture, Hardware & Ra- ELECTRICITY dio Store 100 -227 1-, WDBO Winter Park, Fla., Rollins Col- hatI guarantee under bond lege 500-240 to qualify you for a $3,000 WDBZ Kingston, N. Y., Boy Scouts of America 10 -233 a year electrical job or re- WDOD Chattanooga, Tenn., . Chatta- fund your money. No mat- nooga Radio Co. 500 -256 ter what your education WDRC New Haven, Conn., Doolittle Radio Corp. 100 -268 or previous experience you now can WDWF Cranston, R. I., Dutee W master this amazing new training under Flint, Lincoln Studios, Inc. 500 -440.9 my personal supervision. Electricity WDZ Tuscola, Ill., James L. Bush 10-278 Corner of One of the Seven S. of E. Laboratories WEAF New York, N. Y., American needs trained men. Be one of the high Tel. & Tel. Co. 5000 -491.5 paid electrical experts. WEAI Ithaca, N. Y., Cornell Univer- sity 500 -254 Take This Short Cut to TRAIN AT HOME WEAM North Plainfield, N. J., Bor- ough of North Plainfield... 250 -261 The amazing new, Shop Type system WEAN Providence, R. I., Shepard Co. 500-270 of the S & H Engineering Co., (affiliated WEAO Columbus, Ohio, Ohio State Accomplish Your Ambition 500 with Lincoln Institute of Technology) University -293.9 The Held of electrical engineering offers wonderful WEAR Cleveland, Ohio, Goodyear Tire opportunities for trained men to direct and carry out fits you quick for big jobs. Prepares & Rubber Co 750 -389.4 great industrial and commercial projects. Get a thor- you for your own big, prosperous busi- WEAU Sioux City, Iowa, Davidson ough and practical training here In our course of ness. Hundreds have left low pay jobs Bros. Co. 100 -275 WEBC Superior, Wis., Walter C. ELECTRICAL ENGINEERING and become electrical experts by this Bridges 100 -242 with B. S. Degree In 3 Years simple, easy method. WEBD Anderson, Ind.. Electrical A faculty of specialists is leading hundreds of ambi- tious young men to sure success. Why not you? Equipment & Service Co 15-246 - Roy W. Wal- If you are lacking some preparatory studies you can SEND FOR FREE BOOK WEBE Cambridge, Ohio, make them up here. This is an exceptional opportunity ler 10-234 to become an electrical engineer in the shortest possible You, too can easily qualify WEBH Chicago, Ill., Edgewater Beach time. through this amazing training by Hotel Co. 1500 -370.2 study at home. This training is WEBJ New York,York N. Y., Third JUNIOR ELECTRICAL copyrighted nothing like it ENGINEERING - FREE book. Avenue Co. 500 -273 anywhere. Write today for big WEBL New York, N. Y., Woolworth From 1 to 2 years In this course makes you a com- Shows you what hundreds no better fitted Bldg., United States (port- pletely trained Junior Electrical Engineer -prepared to than you have done. Do not delay. Write me able). R. C. A. 100 -226 fill such positions as general plant superintendent. direc- personally. M. J. Brown, Chief Engineer, S & WEBM New York, N. Y., United tor of construction, superintendent of maintenance, chief D 1422 W. Monroe draftsman, etc. The Junior Electrical Engineer is the H Engineering Co., Dept. -2, States (Portable) Wool - man between the Electrical Engineer and the Electrician St., Chicago. Worth Building' 100 -226 -a well paid position and a stepping stone to higher WEBQ Harrisburg, Ill., Joseph R executive work. A grade school diploma or equivalent admits you without examination. New term opens every Tate 10-226 6 weeks. WEBR Buffalo, N. Y., H. H. Howell 100 -244 Money WEBW Beloit, Wis., Beloit College 500-268 COMMERCIAL ,Make WEBZ Savannah, Ga., Savannah Radio ELECTRICAL ENGINEERING Corp. 50-263 in 1 Boston, Mass., Edison Electric Year es. WEEI Unparalleled opportunities for brilliant, successful TakingPictul Illuminating Co. of Boston 500-348.6 careers in the new field of Commercial Electrical Engi- av¡ We train you quickly at home. No WEHS Evanston, Ill., Robert E neering. To meet the extraordinary present -day de- Spare time 10 mands for trained electrical business men, consulting ,1', - experience necessary. Hughes -202.6 Women ue- or full time. Professional camera WEMC Berrien Springs, Mich., Em- and efficiency engineers, we offer this thorough, con- with in big demand densed and very practical training, especially adapted Ingktedw dignified free. Photographs manuel Missionary College.500 -285.5 to high school graduates. oI s,ont y by magazines, newspapers, adver- WENR Chicago. Ill., All American Ra- t° d mar.. tisers, etc. Also train you to take dio Corp. 1000 -266 PRACTICAL ELECTRICITY week. better portraits than the average WEW St. Louis, Mo., St. Louis Uni- In this complete 6 months' Electrical Course -8 professional photographer! Equipyouto make $50 versity 1000 -248 hours daily -you can learn house, factory and theatre of your own. New plan. wiring, testing and meter work, A.C. and D.C. Arma- to $100 a week in business WFAA Dallas, Tex., Dallas News & ture Winding and all necessary mathematics. Nothingelselikeit. Writetodayforamazingdetails, Dallas Journal 500 -475.9 A 3 months' course in A.C. and D.C. Armature Wind- Inc. WFAM St. Cloud, Minn., Times Pub- ing, or a 3 months' Course in Light and Motor Wir- International Studios, lishing Co. 10-273 ing and Testing is offered to those with limited time 1424 3601 Michigan Ave., Chicago, Ill, and means. Dept. WFAV Lincoln, Nebr., University of Nebraska 500 -275 AUTOMOTIVE ELECTRICITY WFBC Knoxville, Tenn., First Baptist Electrical specialists who instinctively diagnose and Church 50-250 locate automotive electrical troubles command high positions and are well paid. Specialize in starting, LEARN DRAFTING WFBD Philadelphia, Pa., Gethsemane lighting, ignition and storage batteries and command AT HOME IN SPARE TIMEi MVP Baptist Church 5 -234 a big job at a big salary. Become an expert Draftsman-earn WFBE Seymour, Ind., Van de Walle "EARN WHILE YOU LEARN" $50 to $200 per week. Learn Me- Music and Radio Co 10 -226 chanical, Machine, Architectural or We agree to provide for a limited number of worthy Structural Drafting at home in spare WFBG Altoona, Pa William F. Gable young men, half -time jobs at good stages, and perma- time. Personal instruction. Easy Co. 100 -278 nent positions with unlimited prospects to all duly monthly payments. We furnish com- qualified graduates. Here ie the opportunity of your plete set of draining instruments. Free WFBH New York, N. Y., Hotel Ma- life to acquire a thorough, practical training for big - Book explains all -write for it. jestic (Concourse Radio paying profession that is in urgent need for trained pen. THE PRACTICAL MECHANIC Corp.) 500 -273 Dept. 105, South Haven. Mich. ESTABLISHED WFBI Camden, N. J., Galvin Radio 21 YEARS AGO Supply Co. 250 -236 The S. of E. stands absolutely alone in the field of thorough, practical electrical education and in com- WFBJ Collreeville. Minn., St. John's mercial and electrical engineering. SMALL CAPITAL STARTS YOU University 100 -236 - Big opportunity to become inde- N. Y., Onondaga NO NEED OF YOUR BEING WITH- pendent,o No experience need- WFBL Syracuse, ed. eb w you how. Our ea ay Hotel Co. 100 -252 OUT AN S. OF E. TRAINING payment makes to trt Wa gaipy complete. Our WFBM Indianapolis, Ind., Merchants It does not matter how old you are or what school- OurCafaiost machineausedandendoreedbygov- ing you have had. Students from 16 years up to 50 Free Shows tioos. Write today Heat & Light Co. 250-268 are in attendance here. óuhowtoEarn rrvmefor a nstitcatalo Md., Fifth Infan- ATLAS MOVING PICTURE CO. WFBR Baltimore, Fill out the following coupon and mail 596 S. DearboroSt. Dent.!t!I.t'hieago try, Maryland N. G. 100 -254 it to -day. WFBZ Galesburg, Ill., Knox College 20-254 WFDF Flint, Mich., Frank D. Fallian 5`CHOILof ENGINEERING (Police Building) 100 -234 of Milwaukee WFI Philadelphia. Pa., Strawbridge Founded Ms & Clothier 500 -394.5 WFKB Chicago, III., Francis K. Bridg- SCHOOL OF ENGINEERING OF MILWAUKEE Scoria Today -Write for My FREE BOOK. I can make man 500 -217.3 Sl -326A. 415 -417 Marshall Street. Milwaukee, Wis. goodD orr yn a,, home durin¢ pare time. Writ, for BOOK. "How To Become a WFRL Brooklyn, N. Y., Robert M. Without obligating me in any way, please mall free Good Penman." It contain, specimens and tells how 72 -page illustrated book, Electricity and the One Best here maetore4 penmanship by. the Tamblyn System. Lacey and James A. Berg- Way to Learn It," and particulars regarding the course Your name will be elegantly written on a card if you ner Radio Labor- enclose stamp to pay postage. Write talar for book. (Flatbush I have marked with an X. F.W.TAMBLYN,,aaRidgeBlde.Kanaas City, U.S.A. atories) 100 -205.4 .... Electrical Engineering. WGAL Lancaster, Pa., Lancaster Elec- .... Eleetrotechnics. ....Commercial Electrical Engineering. tric Supply & Construction ....Junior Electrical Engineering. Co. 10-248 ....Automotive Electricity. Learn ....Armature Winding. WGBB Freeport, N. Y., Harry H. Car- ....Light. Motor Wiring and Testing. man 100 -244 .... Practical Electr icity. ....I am interested In your "Earn While You Learn" HOME WGBC Memnhis, Tenn., First Baptist Plan. Paver Church 10-278 Name Age Some of the highest paid men in the world are advertising WGBF Evansville, Ind., Finke Furni- men. You can learn easily and quickly at home during Your spare time. Bigger opportunities now in advertising than ture Co. 500 -236 Address at big pay. ever before. Constant demand for our graduates WGBI Scranton, Pa., Frank S. Meg- Send for FREE Book. Giving interesting information and City State vital facts -just what you want to know about advertising. argee 10-240 Write today! PAGE -DAVIS SCHOOL OF ADVERTISING 1159) Education Dept. 1423 3661 Michigan Ave., Chicago, U. S. A. (Continued on page

www.americanradiohistory.com 1158 Science and Invention for April, 1926

These Twenty Regular Monthly Features Make RADIO NEWS the Greatest and Most Complete Radio Publication in the World. It Has Nearly Three Times the Circulation of Any Other Monthly Radio Magazine

1 -EDITORIAL PAGE -STANDARD HOOK- Mr. Hugo Gernsback who writes the 1 UPS editorial of RADIO NEWS has been spoken of Every month RADIO NEws offers many prac- as a man who is responsible for more tech- tical nical developments of radio apparatus than standard hook -ups for the set builders. any other single individual in the industry. This is always a live section for many radio Each month he writes one of his interesting fans. articles on radio's past, present or future. WITH THE AM- -CONTESTS ATEUR Every month RADIO NEws offers hun- RADIO NEWS dreds of dollars in prize has not overlooked the amateur contests which radio are open to all readers. In a recent $300 fan. This is a big section for the ac- "What's Wrong" contest over ninety -seven tive group of radio readers. hundred replies were received. RADIO NEWS UNIVERSAL INTEREST LABORATORIES 3 ARTICLES Established in 1922 the RADIO NEws Labor- This is a most interesting department for atories have maintained a wonderful repu- set owners and users governing general tation for the testing of radio parts. Their subjects which have to do with broadcast seal of approval is the guarantee of value. reception and the various uses of radio re- ceivers in the home. 4"I WANT TO KNOW' RADIOTICS This is the RADIO NEWS question 4 This is the humor section of RADIO and answer department. Where NEWS. It contains some very unusual you can submit your problems to our radio jokes pertaining to radio and makes very engineers for solution each month. There interesting light reading. appears answers to questions asked by many -RECENT RADIO people. 5 PHOTOS INTERNATIONAL This department keeps you in a picture way 15 RADIO in touch with the very latest inventions in This department keeps you in touch with RADIO radio. what is going on in radio outside of the -ARTISTS OF THE United States. It is one of RADIO News's 6 MICROPHONE most interesting departments. NEWS Every month this department of RADIO SCIENTIFIC NEWS gives the reader a group of the people who entertain during the month from our l 6 ARTICLES Everywhere in radio we find opportunities for de- prominent broadcast stations. The march of radio develops many events velopment and improvement. 1926 will surely bring which are of interest to the general public. forth many novel devices for the standardizing and U. S. BROADCAST These are improvement of radio transmitting and receiving and covered in a special department perhaps many new devices for enlarging and broaden- 7 STATION LIST of RADIO NEws. ing the sphere of radio to the people of the world. This regular monthly feature contains an RADIO NEWS is the medium that keeps thousands absolutely active and up -to -date list of every RADIO MANUFAC- and thousands of radio fans in direct touch with what broadcast station in the United States, to- TURING is goingon every where in the industry. It is radio's gether with wave length and power. greatest magazine written for every one who owns or The production and marketing of the radio uses a radio set whether he be a broadcast listener or RADIO SET DIREC- receivers or parts you use are shown in this professional radio engineer. 8 TORY section of RADIO NEws. It is always an inter- By to RADIO NEWS and using the cou- esting corner for our readers. subscribing Annually, in RADIO NEws, is a pon below a copy of RADIO NEWS will be mailed published free direct to your home for twelve months and you can service for radio readers. It is a directory CORRESPONDENCE save 50c over what you would have to pay if you giving complete information as to size and Q bought your copy each month on the newsstand. type of all radio sets manufactured in the 1 lJ FROM READERS Fill out and mail this coupon today. Remember you United States. In this department you can know what is can save 50e and have RADIO NEWS delivered to going on from day -to -day of your home each month for twelve months, do not delay. TECHNICAL INFOR- various read- ers. It keeps you in touch with the ideas of Published by 9 MATION the day. To those readers of RADIO NEws who are Experimenter Publishing Co., Inc. more advanced in radio this department of- RADIO BEGINNER 53 Park Place New York, N. Y. fers plenty of technical information on the 9This is one of the most valuable de- new developments in radio transmitters partments of RADIO NEws for the av- and receiving apparatus. erage listener. In itself it makes every copy worth while to the reader. Experimenter Pub. Co., Inc., -CONSTRUCTIONAL 53 Park Place, New York, N. Y. ARTICLES Gentlemen :- Enclosed find $2.50 for One 10 -SET OWNERS Year's (12 months') Subscription to RADIO The construction of radio sets will never NEWS. cease to be an interesting hobby to those who 20 INFORMATION "build their own" sets, RADIO NEws offers This is for everyone, containing the opin- Name many pages of constructional articles for ions and advice of the best Radio Experts - Address them. Don't miss it. City, State

www.americanradiohistory.com Science and Invention for April, 1926 1159 (Continued fron page 1157) Power Call & Wave Letters Name Location Length WGBM Providence, R. I., Theodore N Saaty 30 -234 \VGBR Marshfield, Wis., George S Ives 10-229 WGBS New York, N. Y., Gimbel Brothers 500 -315.6 WGBU Fulford -by- the -Sea, Fla., Flor- ida Cities Finance Co. . 500 -278 WGBX Orono, Me., University of Cabinet Maine 100 -252 WGCP Newark, N. J., D. W. May, Shop Special Inc. 500 -252 III., Oak Leaves Why Best Jobs No. 10 WGES Oak Park, Broadcasting S t a t i o n (Coyne Elec. School) 500 -250 WGHB Clearwater, Fla., The George Demand $290 H. Bowles Developments 500 -266 AS ILLUSTRATED WGHP Detroit, Mich., George H. WITH MOTOR L; Phelps 1500 -270 WGMU Richmond Hill, N. Y. (port- High School Training Youough':to have this bendy Parks in your shop able) A. H. Grebe & Co 100 -236 We all know the truth of that old adage "Knowl- A compact, complete machine designed just like a WGN Chicago. Ill.. The Tribune edge is Power." big production outfit at one -fifth the cost. Nothing (Drake Hotel) 1000 -302,8 The ability to THINK has lifted man above the extra to buy. Motcrs included, operating from any WGR Buffalo, N. Y., Federal Radio savages. The difference in ability to THINK lifts light socket. Fits in a corner of your basement. 750 Does any kind of cabinet and joinery work. Cir- Corp. -319 one man above another. cular saw, joiner and handsaw on permanent ail - WGST Atlanta, Ga., Georgia School of To EARN more you must be able to THINK steel frame. Add lathe, .shaper and other attach- Technology 500 -270 more. ments at small cost. Yon can make money with this WGY Schenectady, N. Y., General Every penny you invest in developing your Parks! Write for circular. Electric Co. 5000 -379.5 BRAIN will come back to you a hundred or a The Parks Ball Bearing Machine Co. WHA Madison, Wisconsin, University thousand -fold. St., Cincinnati, Ohio of Wisconsin 750 -535.4 1553 Knowlton WHAD Milwaukee. Wis., Marquette Canadian Fac: 200 Notre Dame East, Montreal, Can. University and Milwaukee Increases Earnings 2300% Journal 500 -275 WHAM Rochester, N. ,Y., University The earnings of millions of people have been of Rochester ( E a s t m a n checked up by the U. S. Census Bureau. and the School of Music) 100 -278 result PROVES beyond question that High School WHAP New York, N. Y. Wm. H. graduates earn 23 TIMES as much as grammar Taylor Finance Corp.Ct 500 -240 school graduates! Think what a handicap you will WHAR Atlantic City, N. J., Seaside be under all through your life without high school WOODWORKING MACHINES' Hotel 500 -275 training! WHAS Louisville, Ky., Courier -Journal & Louisville Times 500-399.8 WHAT Minneapolis, Minn., George W. Young 500 -263 High School Subjects WHAV Wilmington, Del., Wilmington Electrical Specialty Co 100 -266 Stop Using a Truss WHAZ Troy, N. Y., Rensselaer Poly- Now Taught a New Way STUART'S PLAPAO. technic Institute 1000 -379.5 It is not too late for you to acquire the essentials PADS are different from WHB Kansas City, Mo., Sweeney of a High School education. A remarkable series of the truss, being mechanics - School Co. 500 -365.6 Question and Answer books bring the High School chemico applicators made WHBA Oil City, Pa., Shaffer Music to your home; you learn in spare time in the most self- adhesive purposely to House 10 -250 fascinating way imaginable. No dry -as hold the distended muscles -dust lessons securely in places No straps, WHBC Canton, Ohio, Rev. E. P. Gra- or essays. Just the most imnortant FACTS pre- buckles or spring attached ham 10-254 sented in the most successful teaching method -cannot slip, ao cannot WHBD Bellefontaine, Ohio, Chas. W known. Every question is right to the point -every chafe or press against the Howard 20-222 answer is simple, direct, easily understood. interest- pubic bone. Thousands have WHBF Rock Island, Ill., Beardsley ing. A reading of these books, in the delightfully successfully treated them- Co. 100 -222 easy form Reduced selves at home without Specialty of questions and answers will soon give Fac -Simile hindrance from work -moot Fee-Soule WHBG Harrisburg, Pa., John S. Skane 20 -231 you the equivalent of High School training-and Gold Medal, obstinate cases conquered. Fac.S;Grand rix WHBH Culver, Ind., Culver Military the greater earning capacity of a High School-edu- Soft as velvet -easy to apply -Inexpensive. Awarded Academy 100 -222 cation! Gold Medal and Grand Prix. Process of recovery la WHBJ Fort Wayne, Ind., Lauer Auto natural, so afterwards no further use for trusses. We Co. 50 -234 Prove It by sending Trial of Plapao absolutelyFREE WHBK Ellsworth, Me., Franklin Street One Dollar per Subject Write name on Coupon and send TODAY. 10-231 Plapao Co., 824 Stuart Bldg., St. Louis Mo Garage These Question and Answer books, if placed in WHBL Chicago. Ill. (portable), C. L. the form of a correspondence course, Name 50 would cost at Carrell -215.7 least $5.00 each or $60 for the set of 12. Since Address WHBM Chicago, Ill., C. L Carrell 20 -215.7 no further instruction Ave. is needed, they are sold as Return mail will bring Free Trial Plapao WHBN St. Petersburg, Fla., First books, at $1. Without question, this is the biggest Methodist Church 10 -238 bargain in education ever offered! WHBP Johnstown, P a . , Johnstown Automobile Co. 100 -256 WHBQ Memphis, Tenn., Men's Fel- Send No Money OF John's MECHANICAL INVESTIGATIONS lowship Class of St. Order one or all of the twelve books, listed in the LEONARDO DA VINCI M. E. Church South 50-233 coupon. Single copies one dollar each. SIX books WHBU Anderson, Ind., Riviera The- only $5.00. The entire twelve for only $9.50. The by Ivor B. Hart. University of London. "The main atre and Sings Clothing 10 -218.8 books will be sent payable outlines of Leonardo's work in dynamics and statics on delivery. If after are given with a clarity and an understanding that WHBW Philadelphia, Pa., D. R. Kien- examination they are make the book a valuable Introduction to these im- zle 100 -215.7 not entirely satisfac- portant branches of Leonard's scientifis studies . .- tory, return in 10 days Price $4.00 WHBY West De Pere, Wis., St. Nor - The London Times. bert's College 50-250 for full refund. Isn't it worth a dol- WHDI Minneapolis, Minn., William lar Hood Dunwoody Industrial a subject to ac- PATENTS, INVENTION AND METHOD quire the essentials of Institute 500 -278 a high school educa- By H. D. Potts WHEC Rochester, N. Y., Hickson tion in this easy, fasci- A guide to the general lines of procedure in invention Electric Co. 100 -258 nating way? discovery. Price $1.00 Do not and WHK Cleveland, Ohio, Radio Air be handicapped a n y Send for Complete Catalog of Publications Service Corp. (Warren R. longer. Begin at once Cox) 1000 -272.6 to make up what you now lack. Mail the THE OPEN COURT PUBLISHING COMFY WEN New York, N. Y., George Schubel 500 -361.2 coupon now. 122 South Michigan Avenue, Chicago, Ill. WHO Des Moines, Iowa, Bankers HIGH SCHOOL HOME STUDY BUREAU, Life Co. 5000-526 Dept. 64, 31 Union Square, New York. WHT Deerfield, Ill., Radiophone Please send me the Question and Answer books Broadcasting Corp. 2500 -238 checked below. OIO WIAD Philadelphia, Pa., Howard R. d e Biology Literature v 'Jo Miller 100 -250 Ancient History Economics d 7 A Cinch WIAS Burlington, Iowa, Home Elec- American History French tric Co. 100 -254 Elementary Algebra Latin to Make WIBA Madison. Wis., Capital Times Physics Spanish Studio 100 -236 Modern History English Grammar a Week WIBC St. Petersburg, Fla., L. M I will give the mail man $1.00 plus delivery charges for 25 each book (I or 12 for $9.50). If not ordered, for for $5.00, Tate Post No. 39, Veterans satisfied with the books 1 will return within 10 days and --In Spare Time of Foreign Wars 100 -222 you are to refund my money. Amazing new home -study method makes WIBG Elkins Park, Pa., St. Paul's Name it easy to learn to make big -paying clever Protestant Episcopal Church 50 -222 Address show cards. Great demand. No talent WIBH New Bedford, Mass., Elite Ra- City State needed. Write for Special offer and illus- dio Stores, James T. Mori- trated Free book to Washington Show Card arty 30 -209.7 Note: If check or money order is mailed with cou- School, Room 264 -D, 1115-15th St. N. W., pon we prepay all delivery charges. Money Washington, D. C. (Continued on page 1161) back if desired after examination.

www.americanradiohistory.com i160 Science and Invention for April, 1926 INTRODUCING

íii%

THE lirdypo,. . Gr';;%air,aii/ .rriiurii ojiM rr NEWEST /7/e/7/.. ,, , STORY MAGAZINE

ADIO NEWS F . SCIENCEE& INVENTION RADIO 25' REVIEW - AMAZING STORIES - RADIO INTERNACIONAL EVERYWHERE Big, Smashing Stories of the Future, Educational, Absorbing 100 You are familiar with some of the brilliant works America. AMAZING STORIES has all of them and of Jules Verne, the master of imagination, H. G. will publish them for several years to come. Wells, with his equally daring imagination, and PAGES other authors of the imaginative school. The publishers of the new magazine are scouring the world for stories of this type, and have already Never before was there a magazine that contained secured English, French, and German works, all of ILLUSTRATED stories of this type exclusively. AMAZING STORIES, which will be published in forthcoming editions. published by the publishers of SCIENCE and IN- In the very first issue, one of the finest bits of VENTION and RADIO NEWS, and edited by Hugo imagination of Jules Verne, "Off Gernsback, himself an author of on a Comet" is imaginative stories, published. There also appears stories by H. G. Stories by will bring to you from month to month the most Wells, Ray Cummings, Edgar Allen amazing stories of the world's greatest scientific Poe, and others. fiction. Interesting, startling, and amazing from cover to H. G. WELLS cover. Every story illustrated. Don't miss the first GREAT issue, buy your copy today and watch for the next JULES VERNE NEWS issue, or you can receive your copy every month The publishers of AMAZING STORIES have con- by sending $2.50. Your dealer will have single EDGAR ALLEN POE tracted for the entire 15 volumes of Jules Verne copies for sale at 25c each. The magazine being ad- stories -each and every story that Jules Verne ever vertised widely, there will be a tremendous demand and other great wrote. Many of these stories have never appeared for it, so place your order today. writers in print before in America, except in one expensive library Amazing Stories is published every month, con- edition, while most of Jules Verné s stories tains 100 big pages, illustrated, large size, 8 x have never been available to the public at large in inches. A great big book. Do not miss it. READ AMAZING STORIES SOLD EVERYWHERE, OR IF YOUR DEALER CANNOT SUPPLY YOU WRITE DIRECT TO Experimenter Publishing Co., Inc., 53 Park Pl., New York

www.americanradiohistory.com 1161 Science and Invention for April,1926 (Continued from page 1159) Power Call & Wave Prices Reduced Letters Name Location Length Make WIBI Flushing, N. Y., Frederick B. rain-Feast On All Standard Zittell, Jr. 50 -218.8 Solvent fruit, such as grape- WIBJ Chicago, Ill. (Portable), C. L fruit, berries,tomatoesUNDER 50 PROPER CONDITIONS: TYPEWRITERS Carrell -215.7 (1) Dissolve or disintegrate LowestPricesinYears WIBM Chicago, Ill. (portable) Billy tumors, goitres, gallstones, de- Wewillshipanymake Maine 10-215.7 posits of lime in joints. you choose for one (2) Dissolve phlegm or mu- week's trial.Underwood, \VIBO Chicago, Ill., Nelson Bros , cus, remove the source of colds, Royal, L. C. Smith, (Russo & Fiorito Orchestra catarrh and consumption. Remington, Oliver, etc. Exchange 1000 -226 (3) Correct liver and kidney A. troubles; headaches. Easy Terms re% WIBR Weirton, W. Va., Thurman (4) Dissolve blood clots as in paralysis. than rent each month Owings 50-246 (5) Dissolve the impurities which cause blemishes to the and own a typewriter. Elizabeth, N. J., (portable) N. skin, as acne, eczema. Guaranteed as good as \\'IBS new. Perfectly rebuilt by J. Nat'l. Guard, 57th In- INTENSIVE FEEDING, JUICES, NO WATER experts -the famous Yormx fantry Brigade 10-202.6 Process." Send for our free trial New rich blood builds healthy tissue. displacing diseased offer and new low price list vow. WRITE TODAY. WIBU Poynette, Wis., The Electric tissue. No diagnosis required, only activities. Write us for Farm 20 -222 particulars of Government Bulletins, describing experiments Typewriter Co. on convicts, hens, cows, etc. Deficient feeding produced Young Dealers in Standard Tgpeuritera WIBW Logansport, Ind., L. L. Dill 100 -220 disease, whereas full nutrition cured, e g., paralysis, blind- World's Largest 150 beriberi, skin affections, 054W. RandolphS t.,Dept 1 164 .Chlcago,llll. WIBX Utica, N. Y., Grid Leak (Inc.) -205.4 ness in hens, rats, etc.; pellagra, Ala., A. D etc., in men. WIBZ Montgomery, The following extracts are from sworn statements of Trum 10--231 pupils : WIL St. Louis, Mo., St. Louis Star PARALYSIS. Age 61. Right hand and leg helpless three Radio Co 250-273 years, restored in three weeks. & Benson Another, age 65. bedridden, hemiplegia. Sensation re- \VIOD Miami Beach, Fla., Carl G stored in three days. Could walk two miles daily after six READ Fisher 1000-247.8 weeks. ARTHRITIS. All joints swollen with lime deposits. Knees \VIP Philadelphia, Pa., Gimbel Broth- and wrists locked immovable for eight months. Blind for AMAZING ers 500 -508.2 two years. Can now see, walk and do home work. WJAD Waco, Texas, Frank P. Jack- CATARRH, HAY FEVER, RESULTING DEAFNESS 500 decreased from the first meal. son -352.7 GALLSTONES. Age 80. Bedridden, cholic every week STORIES WJAG Norfolk, Nebr., Norfolk Daily for years, but not one attack since instruction over a year News . 200 -270 ago now can do housework. Kokomo, Ind., Rev. Clifford TUMORS. Age 40. Tumors weighing several pounds dis- Story Magazine WJAK solved within a year. The Scientific L. White 50 -254 GOITRE. Collar reduced 17 to 15, normal size. WJAM Cedar Rapids, Iowa, D. M. Per- UTERINE HEMORRHAGE. Age 50 Three years in roll- 1160 100 ing chair- weak from constant discharges. Now does SEE ADVERTISEMENT PAGE ham -268 housework, ncluding washing. \/JAR Providence, R. I., The Outlet ECZEMA. Age 69. Eyebrows lost. Skin cracked and Co. (J. Samuels & Bra.) 500 -305.9 scaling. Normal in three months. Ra- PYORRHOEA. Age 65. Pus ceased on 7th day. \V JA S Pittsburgh, Pa., Pittsburgh PREGNANCY. Age 30. With last two children suffered A PERFECT NOSE dio Supply House 500 -275 no nausea, no swollen feet, nor constipation as previously, Shaped at home while WJAX Jacksonville, Fla., City of Jack- Delivery painless. 1000 -336.9 CONSTIPATION. Three Healthy Eliminations Daily. y o u sleep. Rapid, sonville BRAINY MEALS make mental work easy. Muscle painless and safe. The WJAZ Mount Prospect, Ill., Zenith nourishing meals build firm flesh. Sworn statements. Over ANITA is a unique 1500 -322.4 Educational book, 10 cents - most comfortable Radio Corp. 6,000 pupils. and D. Lentz, Jr....50 -206.8 nose adjuster abso- WJBA Joliet, Ill., H. BRINKLER SCHOOL OF EATING 1 u t e l y guaranteed. WJBB St. Petersburg, Fla., L. W. Doctors recommend it highly. No 10 -254 Dept. 61 131 West 72nd Street New York screws. No metal. Winner of GOLD McClung MEDAL Feb. 1923. Write for WJBC La Salle, Ill., Hummer Fur- free booklet. niture Co. 100 -234 ANITA CO., Dept. 473 Anita Bldg., Newark,N.J. WJBG Charlotte, N. C., Interstate THE Radio (Inc.) 10-224 WJBI Red Bank, N. J., Robert S Johnson 250 -218.8 Days Free Trial Ypsilanti, Mich., Ernest F. ® from 44 Styles, colors WJBK Select Ranger bicycles. Goodwin 10-233 and nixes, famous at "80% CONDUCTIVITY" Delivered free on approval. express prepaid, W JBL Decatur, Ill., Wm . Gushard, Factory Prices. from $21.50 up. Brings distant signals in more `a f desired. Parente often Dry Goods Co. 500 -270 Bu,aMon{lled noehintdpoit. New Orleans, La., Valdemar clearly. Original 19- strand non- Boys can earn small payments. WJBO wheels. lamps. horns, equipment Jensen 100 -268 corrosive. Block tin coated. Tres ual PT Mny. Writ foi our marvelouscsl prices and terms. WJBU Lewisburg, Pa., Bucknell Flexible, easily handled. University 100 -211.1 IF YOUR DEALER CAN'T SUPPLY YOU WJJD Mooseheart, Ill., Supreme 100 Lodge, Loyal Order of for foot Moose 500-370.2 trial coil sent Radio Send'1e00 postpaid. FIXTURES" wJR Pontiac, Mich., Jewett "LIGHTING & Phonograph Co. 5000 -516.9 WIRE WORKS COMPANY READY TO HANG R. C. A 1000 -405.2 BUFFALO WJY New York, N. Y., 524 9 -11 So. 7th Street, Direct from the manufacturer. WJZ New York, N. Y., R. C. A Terrace, Completely wired including glassware. Variable-454.3 Buffalo, N. Y. °Y Philadelphia, Pa. Send for new Catalogue No. 27 W KAF Milwaukee, Wis., WKAF (Just reduced prices) Broadcasting Corp. 500-261 Special Proposition to Dealers \VKAQ San Juan, P. R., Radio Corp ERIE FIXTURE SUPPLY CO. of Porto Rico 500 -340.7 Desk B Erie. Pa. WKAR East Lansing. Mich., Michigan State College 1000 -285.5 WKAV Laconia, N. H.. Laconia Radio Club (Portable) 50 -224 MCIDELNIAKEEI WKBB Joliet, Ill., Sanders Brothers 100 -214.2 Everything in Motion Pictures WKBE Webster, Mass., K & B Elec- A new magazine for all interested tric Co. 100 -231 in making Complete short stories for small machines, ft. All leading Stars. WKBG Chicago, Ill. (Portable), C. L 100 to 1000 Carrell 100 -215.7 WORKING MODELS Special Exchange Arrangement WKRC Cincinnati, Ohio, Kodel Radio Send 10 cents for Sample Copy Corp. - 1000-325.9 & 422.3 Metropolitan Motion Picture Company \VKY Oklahoma, Okla., E. C. Hull MODELMAKER, 120 S. LibertySt.,NewYork 108 -110 W 34th St. - New York City and H. S. Richards 100 -275 WLAL Tulsa, Okla., First Christian Church 100 -250 128 Pages: Bigger than ever. New SEND FOR THE INTERNATIONAL CATALOG Our net price list. \\'LAP Louisville, Ky., W. V. Jordan 20 -275 catalog No. 26. 40 kinds and sizes Full line of Steam, Gas and Gasoline Engines. WLBL Stevens Point, Wis., Wisconsin H. and up. Toy and Motor Hot auto bodies of Markets 500 -278 %s P. and accessor- Department Air Engines, Model Airplane Motors, ies for Fords WLIB Elgin, Ill. (near), Liberty Steam Boilers, Pumps, Lathes and at Wholesale Weekly 4000 -302.8 Drill Presses, H. P. Marine Prices. Save Pa., Lit Bros...500 -394.5 Engines, Locomotive Wheels and big money WLIT Philadelphia, Blue Prints, Gears. Pulleys, En- on bodies by buy- WLS Crete, Ill., Sears, Roebuck & gine Castings and Model Makers' 5000 -344.6 Supplies. Sent anywhere 25c sips., ing Direct from Factory. Co. Refunded first order. from $27.85 up. Factory to R. Dutee W. Flint (Silver preferred), FOR FORD -Prices WLSI Cranston, I., Co., 514 W. Van Buren St. consumer direct -Pay only One Profit. Lincoln Studios (Inc.) ...500-440.9 Modern teetne & Supply International Body Works, 914W,Ohio St., Dept.4, Chicago,lll. \\rLTS Chicago, Ill., Lane Technical High School 100 -258 \VLw Harrison, Ohio, Crosley Radio WADE BENCH LATHE Become More Efficient Corp. 500 & 5000 -422.3 Cap: 4" die. x 12" Courses inMat hemat ics, Chemistry, WLWL New York, N. Y., Missionary length. Sliderest has Psychology, Education, Business, Society of St. Paul the travel entire length of command 1500 bed. Lead -screw inside StuTdy and 40 other subjects Apostle -288.3 bed. Hollow spindle. either High School or College WMAC Cazenovia. N. Y., Clive B. Turning. facing, bor- Credit. Start any time. Meredith 100 -275 ing, drilling. winding. No. 2 Round Hills thread -cutting. No. I Lathe, plain headstock, $28.00. Hó me íbije ZBntberSitp of Cbítago WMAF Dartmouth. Mass., headstock, $58.00. Complete line of ac- Radio Corp. 1000 -440.9 Lathe, back- geared Catalog sent free. The 27 Ellis Hall CHICAGO. ILL cessories at equally low prices. (Continued on page 1163) Gerold Company Dept. 5 -14, 120 Liberty St., New York.a

www.americanradiohistory.com 1162 Science and Invention for April, 1926 Two Great Radio Books In One 200 PAGES -300 ILLUSTRATIONS

HOOK -UPS Plenty of new and practical hook -ups. illustrated and ex- lamed in a constructional and non -technical manner. For the radio set builder and amateur.

RADIO ENCYCLOPEDIA Every issue contains an in- stalment of S. Gernsback's Radio Encyclopedia. The first complete, authentic work of its kind. Valuable to everyone interested in radio.

CALL BOOK This is a very valuable refer- ence, a complete list of Broadcast stations. Canadian stations and foreign broadcast stations. The most complete list of its kind. Each list ar- ranged for logging stations with dial setting record blanks.

RADIO LISTENERS INFORMATION This section gives many hints and ideas on the care and operation of a receiving set, together with practical '.;`.v A, information on radio from II+ the listener's point of view. áubiishrd bbi, CONSRAD CO.lmc.: tdi.W YORK Clay

The Most Valuable Radio Book of its kind -for Beginners, Broadcast Listeners and Amateurs SOLD ON ALL NEWSSTANDS Now the RADIO LISTENERS' GUIDE and CALL BOOK is combined with RADIO REVIEW and will be issued four times a year in one great complete volume. Each issue of this great new book contains a complete digest of practical radio hook -ups culled from radio press throughout the world, S. Gernsback's well known radio encyclopedia, in installments, an international radio press digest of news and information, a complete accurate list of Broadcast station call letters, and a valuable 5 section replete with information for the Broadcast listener. Published in the large Magazine size, contains 200 pages and more than 300 illustrations ALL FOR 50c the COPY. Watch for the first issue on all newsstands and all radio stores beginning February 1st. You will buy the biggest value in wealth of radio reference material ever printed for the radio' PER broadcast listener, amateur or professional. Published and Distributed by COPY The Consrad Co. Inc. 64 Church St. New York, N.Y.

www.americanradiohistory.com 1163 Science and Invention for April,1926 When. , (Continued from page 1161) Power Play the FR E E eñróll Call & Wave ,HAWAIIAN Letters Location and Name Length World's Greatest he WMAK Lockport, N. Y., Norton Lab- HAWAIIAN ALA/GUITAR, oratories 500 -266 Discovery D. C., M. A Thought ) . and Case' WMAL Washington, ALPHA MATH O LOGY GUITAR Leese Optical Co. 15-212.6 Perpetual Scale, without A.D. 1926 -FPZF Just as the Only 4 Motions n ed in W MAN Columbus, Ohio, First Baptist beginning or end, in Cy- Jewish y'r 5686 -FPZF nativo 50 -278 ele, or Vibration with Japanese y'r 2586 -FPZF Do nstrument. Our Church Natives Hawaiian Inatrucrcr.. ':WA WMAQ Chicago, Ill., Chicago Daily Cosmic energy -The Key Julian Period in year J teach you to master to the Universe! 66 hundred -FPZF them quickly. Picture. News 1000 -447.5 aho h ",w. Everything ex- Psychology on mathematical basis plained clearly. WMAY St. Louis, Mo., Kingshighway - - - 100 Play in Half Hour Easy Lessons Presbyterian Church -248 After you, get the four Even if you don't know WMAZ Macon, Ga., Mercer University 500-261 FORETELL BY SCALE use motions you play a to £ro.nt another, Chicago, Ill., American Bond & The psychological color scheme, the styles, the tear little achordewith the e'2 printed tannons WMBB intoning letters in names day ve.y little practice. No and the clew picture Mortgage Co. 500 -250 advertising leads, the previousmusicalknowt- make it sue to learn after day and year after year. edge necessary. quickly. Per sa peupler. WMBC Detroit, Mich., Michigan Winning energy correct in Fifty -four consecutive Free Guitar Write at Once Broadcasting Co. (F G. games of World's Baseball Series since 1921 and and Outfit in Genuine Seal Grain You'll never he lonesome with Siegel) 100 -256.4 Dixie Series sines 1923- Either the Psychology of beautiful Hawaiian Guitar. Place, the Pitcher, or an Individual Player in roll. Nothing to buy-everything Write WMBF Miami Beach, Fla., Fleetwood A postcard will do. ACTT VIBRATION made an outstanding play, hit or furnished. No delay. tams. Hotel Corp. 500-384.4 catch that won the game. HAWAIIAN CONSERVATOR" of MUSIC Inc. FIRST New Mork. N. Y. WMC Memphis, Tenn., ''Commercial In Business, or otherwise, tune -in your conscious 9th Floor. Woolworth Bldg., Dept.-- 140 Appeal" 500-499.7 Intellectual Energy with subconscious urge, or Solar s Approved as et Law. thej e& tro,York N. J., Hotel McAlpin Energy and win! Be sure you are in Vibration and Ì WMCA Hoboken, then go ahead. A "Good Name" in vibration with the (Greeley Square Hotel Co.) 500 -340.7 public's subconscious mind is worth $80,000,000. WNAB Boston, Mass., S.tepaid Stores 100 -250 "Mass Intellectual -Pressure and the Alpha -Maths WNAC Boston, Mass., Shepard Stores 500-280.2 Vibratory Scale " -48 -page booklet containing the WNAD Norman, Okla., University of greatest thought Discovery of this or any other age, Oklahoma 500-254 with Brain -Wave or Alpha -Metho Calendar -Price WNAL Omaha. Nebr., Omaha Central $1.00. 150 Home -Study Books High School 50-258 Twelfth Edition; Sold Around the World of these sure pay raising, WNAT Philadelphia, Pa., Lenning (The Yorkshire Institute of England placed Each Brothers Co. 100 -250 order for 500 copies and Books and Authors. New self -help books is a complete WNAX Yankton, S. Dak., Dakota Ra- York, June issue. "challenges the scientists. ") dio Anoarattts Co. 100 -244 course of instruction. They MACK ulMuruEn, Electricity, Automobile, WNBH New Bedford, Mass., Irving J. PIS Wosrth.TTTexas. Avenue'a cover Vermilya and A. J. Lopez 250-248 Credentials: Author of the World's Machine S h o p, Carpentry, WNJ Newa °k, N. J., Radio Shop of Greatest Prophetic and Psychological novel, "Humanity and the Mysterious Painting, Engineering, Rail- Newark 150 -252 Money back WNOX Knoxville, Tenn., Peoples Tele- Knight." which foretold the broad - roading and twenty other and casting of "human voice." Marronl's phone & Telegraph Co. 100 -268 new invention, the "reflector," 'Wier of 10 per cent trades. Full catalogue FREE. WNYC New York, N. Y., City in five days, music," "Weill War." the election 1000.-526 of President and over one hun- A post -card brings yours. New York desired "B." WOAI San Antonio, Tex.. Southern dred other world events. J. DRAKE & CO., Publishers Equipment Co. 2000 -394.5 F. WOAN Lawrenceburg, Tenn., Jantes 1009 S Michigan Avenue, Chicago D. Vaughn 500 -282.8 WOAW Omaha, Nebr., Woodmen of the World 1000 -526 WOAX Trenton. N. J., Franklyn J Wolff . 500 -240 WOC Davenport, Iowa, Palmer School of Chiropractic.... 5000-483.6 WOCL Jamestown, N. Y., Hotel James- town 15 -275 WODA Paterson, N. J., O'Dea Temple of Music 250 -224 WOI Ames, Iowa, Iowa State Col- lege 750 -270 WOK Homewood, Ill., Neutrowound owl Learn to Draw Radio Mfg. Co. 5000 -217.3 WOICO New York, N. Y., Otto Baur 50 -233 WOO Philatle'pltia, Pa., John Waua- at Home maker 500 -508.2 an artist through an amazingly easy method- Become Design- WOOD Grand Rapids Mich., Grand PowerAN right at home in spare time. Learn Illustrating. u ing, Cartooning. Trained artists earn from $50 to over Rapids Radio Co. 500 -242 $250 a week. FREE 1100K tells all about this simple WOO Kansas City. Mo.. Unity Light Weight! method of learning to drain and gives details of special School of Christianity 1000 -278 free offer. Mail postcard now. O the finest sport in the world - WOR Newark, N. J., L. Bomberger great WASHINGTON SCHOOL OF ART & Co. 500 -405.2 outboard motor boating-this Room 264 -D. I115 -15th St., N. W.. Washington, D. C WORD Batavia, Ill., Peoples Pulpit T new Super Elto brings still higher 5000 Course for men of ambi- Association -275 standards of thrilling performance, of tion and limited t i m e. \VOS JefTerson ('itv, Mo.. Missouri extraordinary power combined with Electrical Over 4000 men trained. State Marketing Bureau .. 500 -440.9 in and Practical Elec- light, compact portability. Condensed course Theoretical New Orleans, La., Owl Battery trical including WO WL Now 4 horsepower (full 4 h. p., S. A. E. rat- Co. 10 -270 ing) yet- not an ounce of increased weight) Engineering lyreated WOWO Fort Wayne, Ind., Main Auto subjects of Mathematics and Mechanical Drawing Supply Co. 500 -227 And to superb performance and light weight, taught by experts. Students construct motors, install eddinstant starting and unparalleled depend- wiring, test electrical machinery. Complete course WPAK Agricultural College, N. Dak , ability. And add full steering and motor con- North Dakota Agricultural trol from any part of the boat - trouble -free College 50-275 propello -pump - and a dozen other valuable [n One Year Shore features. All are described in Intensely in- Prepare for your profession in the most WPCC Chicago, Ill., North it interesting city in the world. School Congregational Church 500 -258 teresting new free catalog. Write for today) rit established 1893. Send for catalog. ELTO OUTBOARD MOTOR COMPANY BLISS ELECTRICAL SCHOOL WPG Atlantic - City, N. J., Munici- 444 D. C. of Atlantic City .. 500 -299.8 Ole Evinrude, President Takcma Ave., Washington, pality Home Bldg., Milwaukee,Wis. Pa., Wilson Print- Dept. 48 Mfr's WPRC Harrisburg, scar, on a quarter tarn 4 or o"% Cut to ing and Radio Co. 100-215.7 Barrel e` $ 25 WPSC State College, Penna., Penn- 6 -Shot Finest sylvania State College 500-261 Long Range Revolver i i'" aper This gun "free' if you '.._;..a-- -= t \ WQAA Parkesburg. Pa., Horace A. can beat our price any- - --` Beale, Jr. 500 -220 where-4 or 6 in. barrel, / t r Texas, Gish Radio blue or nickel-32. 38 -or 22 . WQAC Amarillo, we offer caliber. J11i Service 100 -234.2 AGENTS YOU hitting. Money ba^* m,trantee. Radio The Opportunity to get into a Permanent Business for Your- Pay on delivery $6.25 Federal Mail Order WQAE Springfield, Vt., Moore self representing our extensive Line of 260 Products in your X80 News Station 50 -246 territory. Sure Repeaters: 30 years on Market. Our 11 Co. 414 Broadway, New York, Dept. piece Toilet Goods Assortment at $2.00 with a 2 piece Carving WQAM Miami, Fla., Electrical Equip- Set FREE to your Customers is one big winner. Part time ment Co. 100 -263 accepted, but full time will netyou $50, $60, up to$76 a week. ANT WORK..gZE ? WQAN Scranton, Pa., Scranton Times 100 -250 Easy: to Average $50.00 a Week. Earn$18 to$60 -a week RETOUCHING photos. WQAO New York, N. Y., Calvary What more could you ask while introducing line of Soaps Men or women. No selling or canvassing. We Baptist Church 100 -360 Toilet Articles,Food Specialties Polishes, Remedies, etc. at teach you, guarantee employment, and furnish Attractive Prices.1001 profit. Write Today for illustrated WORKING OUTFIT FREE. Limited offer. WQJ Chicago, Ill., Calumet Rainbo Circular explaining our Unique Sales Plans. Act Now. Write today. Arteraft Studios, Dept. 43. 3900 Broadcasting Co. 500 -447.5 E. M. DAVIS COMPANY Dept. 6740 CHICAGO Sheridan Rd., Chicago. WRAF Laporte, Ind., The Radio Club, The Famous KON -VER -TER Slide Rule Inc. 100 -224 instantly adds, subtracts. divides. multiplies, converts fractions or Print Your Paper,Own etc. Save Galesburg, Ill., Lombard Col- Cards, Stat:enery, Circulars, WRAM decimals of an inch. Gives sines. for others, big profit. Complete lege 100 -244 versed money. Print All co- sines, versed sines. co- outfits $8.85. Job press $12, $35, Rotary $150. Ohio, Antioch sines, tangents, co- tangents. se- easy, rules sent. Write for catalog presses type WRAV Yellow Springs, canta co-secants .of angles direct- etc. THE PRESS CO., Y 47, Meriden. Conn. College 100 -263 ly. Gives square roots. squares, Pa., Avenue Radio cube roots, cubes and fifth roots WRAW Reading, all numbers. Log- CLASS RINGS&P /NS & Electric Shop 10 -238 and powers of Largest Catalog Issued -FREE. arithms, co- logarithms, antilog- WRAX Gloucester City, N. J., Flex - arithms. Instructions with rule. Samples loaned class offi- on's Garage 500 -268 DeLtixe Model $3. Cash-or C.O.» cers. Prices $.20 to $8.00 New England Novelty Company each. No order for clans, society, club (Continued on page 1165) Wakefield. Mass. emblems too large or trio small Special designs made ea request. Roehesdr. N.T. METAL ARTS CO.. lac. 7723 South Are..

www.americanradiohistory.com 1164 Science and Invention for April, 1926

Prepared by the staff of cience.t.d Invention under the direction of Prof.Dunninger

Compiled by the Staff of Science and Invention under the direction of Your PROF. DUNNINGER Surprise Friends a The man who mystified the with Prince of Wales, Ex- Presi- dents Harding, Taft, Roose- Mastern of MysterY velt, President Coolidge and other celebrities. Be the popular man in your circle of friends. You can enter- tain them and hold their attention with a thousand surprises and novelties. POPULAR MAGIC is a book for you, for everybody, young or old. But especially for those who want popularity, those POPULAR MAGIC who want to realize how much the admiration of friends helps toward making life worth more. 116 Pages Size 9x12 Inches POPULAR MAGIC contains thousands of simple, entertain- 500 Illustrations ing parlor tricks, as many puzzling magical stunts and a whole book full of mystic spirit novelties. A new set of tricks for including Chemical tricks magazine Card tricks Lyceum tricks every day of the year. Compiled from the great Dice tricks Stage tricks "SCIENCE and INVENTION." Match tricks Popular Magic GET THIS GREAT BOOK TODAY. Chock full of Amateur tricks Spirit tricks Tricks, Novelties, Mystic performances, Master sleights -of- hand, Gags, Disappearing acts. All kinds of fun. Buy a copy 50c The COPY or order direct. PRICE, 50c. r ti POPULAR MAGIC is sold on all newsstands. You EXPERIMENTER PUB. CO., Inc. can obtain a copy today from your news dealer or you 53 Park Place, New York, N. Y. can use the coupon on this page and order direct enclos- Gentlemen: -Enclosed find 50c for which send me one copy ing 50c money order or stamps. of POPULAR MAGIC. Name Published by Address Publishing Inc. City State Experimenter Co.. 53 Park Place New York, N. Y.

www.americanradiohistory.com Science and Invention for April, 1926 1165 (Continued front page 1163) Power Call & Wave Letters Name Location Length Music_ Lessons' WRBC Valparaiso, Ind., Immanuel Lutheran Church 500 -278 WITH AN ACCREDITED SCHOOL WRC Washington, D. C., Radio Corp. of America 1000-468.5 WRCO Raleigh, N. C., Wynne Radio Co. 100 -252 At-Horne- WREC Coldwater, Miss., Wooten's - Radio & Elec. Co. 10-254 WREO Lansing, Mien., Reo Motor A Complete Conservatory Course Car Co. 500 =285.5 Wonderful home study music lessons under BRA_y man great American and European teachers. WRHF Washington, D. C., Washing- Endorsed by Paderewski. Master teachers guide and coacb ton Radio Hospital Fund 50-258 you. Lessons a marvel of simplicity and completeness. WRHM Minneapolis, Minn., Rosedale The only recognized Conservatory of Music giving lessons Hospital 50-252 by the UNIVERSITY EXTENSION METHOD. WRIT Hamilton. Ohio, Doron Bros. The ideal of a genuine Conservatory of Music for home Electrical Co. 100-270 study based upon !moons containing the cream of the life's WRM Urbana, 111., University of Illi- teaching experience of Master Musicians, reinforced by the nois 500-273 instruction of specialists, is now attained. individual WRMU Richmond Hill, N. Y., M U -1 The instruction of a master-the individual H. Grebe 100-236 touch of an accomplished teacher-is yours to (Yacht) A. This man is sure 4. command front the very moment you enrol/. WRNY New York. Y., Experimen- The University Extension Conservatory, by adopting the ter Publishing Co. 500 -258 Personal instruction Method, has placed home music study WRR Dallas, Tex., City of Dallas, of his job beyond question as to resulte. Anyone can learn at home. Police and Fire Signal De- Write telling oc course you.are partment 500 -246 HE SAW the handwriting on the wall. Men Any Instrument interestedin -Pino Harmny, WRST Bay Shore, N. Y., Radiotel around him were being dropped right and Voice, Public School Music, Violin, Cornet, Mandolin . Guitar, 250 send Free Catalog Mfg. Co. -215.7 left. He might have been the next to go but Reed & Bro. with details youuw nt. Send ow WRVA Richmond, Va., Larus for a familiar coupon which he saw in a magazine. CONSERVATORY Co. . 1000 -256 BuiidingON WRW Tarrytown, N. Y., Tarrytown He tore it out and mailed it to Scranton. u2280SiegelMYyerE Radio Research Labora- Then one day his employer called him in. tory (Koenig Bros.) 500 -273 "Young man," he said, I have just received WSAI Mason, Ohio, United States a letter from the International Correspondence SEE PAGE 1160 Playing Card Co. 5000 -325.9 Schools telling me you have enrolled and have WSAJ Grove City, Pa., Grove City received a mark of 93 for your first lesson. College 250-229 "I don't mind saying that this letter has COMPLETE DATA ON THE WSAN Allentown, Pa., Allentown Call 100 -229 saved your job. I had you on the list of men NEWEST Publishing Co. keep you now. STORY MAGAZINE WSAR Fall River, Mass., Doughty & to be dropped. But I'm going to Welch Electrical Co. 100 -254 And there are bigger things ahead for you. The Amazing WS AU Chesham, N. H., Camp Marien- man who thinks enough of his future to study Stories feld 10 -229 his job is the kind of a man we want." - WSAX Chicago, Ill., Zenith Radio New Novel Corp. 100 -268 OW about you? Are you sitting on the anxious WSAZ Pomeroy, Ohio, Chase Electric H bench wondering if you will be the next to go? Shop 50 -244 Or are you training yourself so that you will not WSB Atlanta, Ga., Atlanta Journal 1000 -428.3 only be sure of your present job, but will be ready WSBC Chicago, Ill., World Battery for the job ahead? Aviation Co. 1000 -209.7 This is all we ask: Without cost or obligation, WSBF St. Louis, Mo., Stix Baer & put it up to us to prove how we can help you. Fuller 250 -273 Just mark and mail this coupon. Take a WSBT South Bend, Ind., South Bend W. A. C. Course Tribune 250 -275 in Applied Airplane WSDA New York, N. Y., City Temple 250 -2o; INTERNATIONAL CORRESPONDENCE SCHOOLS Engineering. Many Mich., Star men earn $2000 to $10,000 a year. Big Free WSKC Bay City, Worlds Box 6236. D. Scranton, Penna. outfit of airplane parts. Write for Free catalog. Knitting Co. 100 -261 Oldest and largest correspondence ach000ia in the world WSM Nashville, Tenn., National Life Without cost, please tell me how I can qualify for the WESTERN AIRPLANE CORPORATION Co. -282.8 position or in the subject before which I have marked. an X: "Dept S -4" Monadnock Blk., Chicago. III. & Accident Ins. ....1000 WSMB New Orleans, La., Saenger BUSINESS TRAINING COURSES Amusement & Maison SBusiness Management D Salesmanship "Bow Legs and Knock - 500 -319 Industrial Management Advertising ' Blanche Co. °Personnel Organization Better Letters WSMH Owosso, Mich., Shattuck Mu- Tra1Hc Management Show Card Lettering Knees" Unsightly sic House 20 -240 Business Law Stenography and Typing WSMK Dayton, Ohio, S.M.K. Radio Banking and Banking Law Business English Send for booklet showing Corp. 500 -275 Accountancy ( including C.P.A.) Civil Service °Nicholson Cost Accounting Railway Mail Cleric photos of men with and without WSOE Mil 'm'oti ee. Wis., Srhonl of School Subjects 500 Bookkeeping °Common THE PERFECT LEG FORMS. Engineering of Milwaukee.. -246 Private Secretary High School Subjects WSRO Hamilton Ohio, Radio Co. Spanish French D Illustrating SALES CO. (Harry W. Fahrlander) .... 100 -252 TECHNICAL AND INDUSTRIAL COURSES PERFECT WSSH Boston, Mass.. Tremont Electrical Engineering Architect 140 N. Mayfleld Ave., Dept. 50. Chicago, III. Temple Baptist Church 100 -261 ['Electric Lighting ['Architects' Blueprints °Mechanical Engineer Contractor and Builder WSUI Iowa City, Iowa, State Univer- Mechanical Draftsman Architectural Draftsman NEW METHOD stñling sity of Iowa 500 -483.6 Machine Shop Practice Concrete Builder °Railroad Positions Engineer POCKET LIGHTER WSVS Buffalo, N. Y., Seneca Vo- D oss Engine Operating °StructuralChemistry Pharmacy What Makes It Light? cational School 50 -218.8 °Civil Engineer Automobile Work No wind can blow it out. WTAB Fall River, Mass., Fall River Surveying and Mapping airplane Engines Publishing Co. 100 ° Metallurgy Mining O Agriculture and Poultry The Wonder Light Daily Herald -266 Engineering Radio Mathematics A Scientific Marvel USXCA WTAD Carthage, Ill., Robert E. Comp- Steam Triple Gold Plated, $1.00. Fully Guaranteed. ton 50-236 Name NEW METHOD MFG. CO. WTAG Worcester, Mass., Worcester 6 -26 -25 Bradford, Pa. Telegram Publishing Co 500-268 Street Dept. S-1 -4 Address Dealers -Ask your jobber for this ready seller WTAL Toledo, Ohio, Toledo Radio & 10 Electric Co. -252 Stato WTAM Cleveland, Ohio, Willard Stor- City Straightens Shoulders age Battery Co. 3500 -389.4 Pep Occupation WTAP Cambridge, III., Cambridge Ra- reside in Canada, send this coupon to the Interna- THE NATURAL BODY BRACE -Corrects ll you Limited, Montreal stooping shoulders, straightens the back, gives dio & Electric Co 50-242 tional Correspondence Schools Canadian the lungs chance for normal expansion, induces WTAQ Osseo, Wis., S. H. Van Gor- Brings comfort, den & Son 100 -254 energy, and pep For men and women.i CALCULATIONS WTAR Norfolk, Va., Reliance Elec- in the Store, Office, Shop, Etc.. Costs nothing to try it tric Co. 100 -261 can be instantly made with the Write for 30 days free trial offer and free book. WTAW College Station, Tex., Agricul- Midget Slide Rule. If you have BDnQOY BRACE CO. tural & Mechanical College any figuring to do, order one on NATURA.,L, trial. It is the most versatile Howard C. Bash.R*.286BashBldg.. Salina, Kansas of Texas 500 -270 calculator ever invented. WTAX Streator, Ill., Williams Hard- The Engine -Divided Scales are ware Co. 50 -231 on white celluloid. mounted on LEARN TO DRAW N. J., Thomas J. aluminum, grease- and water- Remarkable book- "COMMERCIAL WTAZ Lambertville, proof. Size 4 ". ART AND CARTOONING." En. McGuire 15 -261 Price, with Instruction Book, plains how to_maka illuatrationa for e b ksadvert,aemoonisttc. Alsohow WTIC Hartford, Conn., Travelers In- (Patented 1 -17 -221 $1.50. Leather Case 50e extra. to become a Cartoonist. NO COR- surance Co. 500 -475.9 Sent C. O. D., if desired. Catalog free. RESPONDENCE COURSE Book Your you are not satisfied. ilisetra- & money back if Celle 11 --14 chapters--125 WWAD Philadelphia, Pa., Wright RILSON SLIDE RULE CO., NIIes. Mich. fag; Explainsiss Elementart Drawl Wright, Inc. 250 -250

anal CrayonfWork; Ckrt000ning, Plainfield, Ill., Lawrence - J. Poetva d for WWAE eta Bound Flexible, Im. Leather. Crowley (Electric Park) 500 -242 57 Rose Str et? New YorkGILVI Dept. 139 WWAO Houghton, Mich., Michigan CONCERTINA --Plays by Rolls College of Mines 250-263 Pamphlets WWGL Richmond Hill, N. Y., Radio Played by Free Engineering Corp. 500 -212.6 Anyone with -. Postpaid WWI Dearborn, Mich., Ford Motor out Knowledge Latest Co. 500 -266 of Music Music Send $1.00 for Beginners Instructions with WWJ Detroit, Mich., Detroit News .1000 -352.7 Laugh Producing Program of 23 Comic Trick Talk Supplies Free. WWL New Orleans, La., Loyola Uni- CHARLES PITTLE & CO., New Bedford, Mass drawings. raising of Chalk versity 100 BALDA ART SERVICE. Dept. 4, Oshkosh, Wisconsin -275

www.americanradiohistory.com 1166 Science and Invention for April, 1926

c/_o,._ . rEI 'a..._..gntel- - sm / Opportunity Ad -lets YOU will find many remarkable opportunities and real bargains in these columns. It will pay you to read and investigate the offerings made every month by reliable firms, dealers and amateurs from all over the country. No matter what you may be seeking, whether supplies, automobile accessories, the opportunity to make money, or anything else, you will find listed here the best and most attractive specials of the month. Advertisements in this section twelve cents a word for each insertion. Name and address must be included at the above rate. Cash should accompany all classified advertisements unless placed by an accredited advertising agency. No advertisement for less than 10 words accepted. Ten per cent. discount for 6 issues, 20 per cent.. discount for 12 issues. Objectionable or misleading advertisements not accepted. Adver- tisements for the June issue must reach us not later than April 10th. The Circulation of Science and Invention is over 150,000 and climbing every month . EXPERIMENTER PUBLISHING CO., INC., 53 Park Place, New York City, N. Y.

Advertising Agents Agents Wanted (continued) Aviation Advertising in all magazines and newspapers at publishers' Newest Invention! Sells everywhere. Automatically pre- Boys -Get a three -foot model aeroplane free. Write to lowest rates. Rate Book Free. Taylor's Advetrising Service, vents telephone and iron cords from tangling and kinking. Aero Shop, 3050 Hurlbut Ave., Detroit, Mich. Dept. 6, Freeport, Ill. $90 weekly. Samples for test if desired. Neverknot, Dept. 1 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 G4, McClurg Bldg., Chicago. . a o 1, 1 1 1, 11 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 111 1 1 1 1 1 1 1 1 11 1 1, 111 1,,,,,,,,m 1, 1,,,, 1 1 1 1 1 1 1 ewmuwuusenuunun1 1 1 nn 1 1 w 1 un u1u111u11111 1nnuunnm.,n1,11 11m 1uuuu inamwuuu,uuan111e Manufacture In home or shop. Newest, fast -selling, nov- Battle Photos and War Relics Agents Wanted elties, toys, preparations, mail- order, agents' goods. Free list reliable, plans, patterns. processes, commercial infor- mation. Manufacturers' Bureau, 3937L Tracy, Kansas For Dens: Relics Collected from Europe's Battlefields. Agents-Best seller; Jem Rubber Repair for tires and City, Ma Firearms, medals, helmets, etc. Illustrated catalogue and tubes; supersedes vulcanization at a saving of over 800 per sample War photographs 25c. Lieut. Welch. 1839 Albany Men wanted sell my new cent; put it on cold. - It vulcanizes itself in two minutes and to puncture -proof inner tube. Ave., Brooklyn, N. Y. is guaranteed to last the life of the tire or tube; sella to Demonstrate by driving nails into tire. In testa have every auto owner and accessory dealer. For particulars how given good service after having 500 nail holes in them. to make big money and free sample, address Amazon Rubber Doubles tire mileage. Sold under money -back guarantee. 601, Philadelphia, Pa. Big money and exclusive territory. Free Tube Offer. Books Co.. Dept. Write L. M. Milburn, 334 West 47th, Chicago. Agents-Write for Free Samples. Sell Madison "Better - Made ". Shirts for large Manufacturer direct to wearer. No $20 Daily. World's greatest seller. Marvelous 3 -in -I Free -Upon request will send you my literature illus- home necessity. Retails $3.50. Amazing plan. No capi- trating the following books. Astrology, Character. Clair- capital or experience required. Many earn $100 weekly and tal. Write bonus. Madison Company, 566 Broadway, New York. today, C125, Lobl Company, Middleboro, Mass. voyance. Concentration, Healing, Hypnotism, Magnetism; Agents: America's fastest selling shirt, lumberjack and Medlumship, Personal Magnetism, Personality, Physiog- Big money and fast sales. Every owner buys gold ini- nomy, Salesmanship, Seership, Success, Sea. Will. Yogi You $1.50; make $1.35. Ten necktie line. $100.00 weekly easy. Shirts as low as 2 for tials for his auto. charge $2.95. Big commission and bonus. Free gifts insure volume Philosophy, Gazing Crystals, etc. A. W. Martens. E. E. orders daily easy. Write for particulars and free samples. sales. Elaborate who 6. Burlington. Iowa. Co., Dept. 71, East Orange. N. J. outfit free to first 500 write. Howard American Monogram Shirt Co., 105 So. Dearborn, Dept. 112, Chicago. "Master Key" Success Wonderful. 410 Pages, cloth, Earn $10 daily silvering mirrors, plating and refinishing $2.65. Bargain lists 10e. Phipps Library, 1014 Belmont, metalware, chandeliers, bedsteads, headlights. utflts fur- If I send you Shoes made -to -your measure in any one 69 Chicago nished. N. Ernie Laboratories, 11331 Broadway, New York. leathers, 50 different styles, will you keep them. wear them, ommummilimionimimmelltmluntmunmummulomurminututtrinacnummumnicamommilmn $60 -$200 a week. Genuine Gold Letters far store win- show them to your friends as sample of my $10 Made - dows. Easily applied. Free samples Liberal otter to to -Order shoes to sell at $6.85. Advise me today. Your general agents. Metallic Letter Co.. 441 B., North Clark, sample outfit will go forward absolutely free at once. Dept. Business Opportunities Chicago. 8079, Forrest Dustin, 932 S. Wrightwood Ave., Chicago. Free Book. Start little Mail Order business. Pier. 996 SIS daily silvering mirrors, plating and refinishing lamps, Cortland Street, New York. reflectors, autos, beds. chandeliers by new method. Outfits furnished. Write Gunmetal Co.. Ave. D. Decatur. Ill. You can have a business -profession of your own and earn Only one sale a day means $200 per month! Marvelous big income in service fees. A new system of foot correction; new adding machine. Retails $15.00. Work equals $350 readily learned by anyone at home in a few weeks. Easy machine. Adds, subtracts, multiplies, divides, automatic- terms for training, openings everywhere with all the trade ally. Computes feet and inches. Speedy, accurate, durable, -PROOF you can attend to. No capital required or goods to buy, no handsome. Five year gaarantee. Offices, Stores, factories, agency or soliciting. Address Stephenson Laboratory. 18 - Beek Bay, Boston, Mass. garages, lumbermen buy one to dozen. A fortune for live That Classified Advertising Pays agents. Write quick for protected territory and free trial. Stop Plodding! Be Successful. Operate a Tire Repair Lightning Calculator Co., Dept. W, Grand Rapids, Shop. Slake big profits in any locality. We teach you and Michigan. furbish complete equipments $100 up. Book of Opportunity Bankrupt and Rummage Sales. Make $50.00 daily. We Pisgah, Ala., free. Haywood's, 1312 South Oakley Avenue. Chicago. start you, furnishing everything. Distributors. Dept. 171;609 Jan. 27th, 1926 Dollars yearly in your backyard. No mushroom dope. Division, Chicago. Particulars free. Metz, 313 East 89th, New York. SCIENCE & INVENTION: Wash clothes the new way. Use the Torrent Automatic Responsible Manufacturer wants competent men to man- Washer. You will be delighted. Special offer to one in I am using a number of the big na- age office and salesmen. $300 to $1500 necessary; will al- each locality. Storm Royalty Co., 3602 Enright Ave., tional magazines and I regard Science low expenses to Trenton if you qualify. Address Manager, St. Louis, Mo. & Invention one of the best. I have 536 Forst Richey Bldg.. Trenton, N. J. No Dull Times Selling Food. People must eat. Federal been with you about four years and make big money; yearly and up. No capi- Independence-Our twenty scientific processes put you distributors $3,000 have no intention of cancelling my ad- wise. Excellent. We make money. no can you. Only 50c. tol or experience needed; guaranteed sales; unsold goods Holland Laboratory, Box 473, may be returned. We furnish you with license. Your vertisement. Very truly yours, Astoria. Oregon. $20.00 starting order sent on trust. Free Samples to cus- LEE MOUNTAIN. tomers Repeat orders sure; Exclusive territory. Ask now. Foreign Bonds, stocks, drafts and currencies. All na- Federal -Pure Food Co., SS2311 Archer, Chicago. ttons. Frank Y. Everett Co., 35 Wall St., New York, Make Money Silvering Mirrors, refinishing auto head- $212.00 a month, spare time work, no manufacturing or lights, tableware, metal plating, bed steads, chandeliers. -still another one canvassing. Want to knew how? Particulars for stamp. Outfits furnished. International Laboratories, Dept. 69, 309 Specialty Supplies, 410 Mfgs. Bldg.. Denver, Colo. Fifth Ave., New York. Oshkosh, Wis. Agents-No canvassing. No delivering. No money in- Taymakers-Moka money at home. Proposition and blue- vested. Pleasant work. Big Money. Appointing local agents Jan. 25th, 1926. prints 30c. Weesho -Uko, 31st Station, Detroit, Mich. to Introduce welcome foods. Welcome Products, 326 Harvey, SCIENCE & INVENTION: Illinois. My advertisement has been appearing 111111/11111111111111111111111111111111111111111111111111 11111111111111111111111/1111111111111111111111111171111111111111111111111111111116 Quit Ringing Doorbells. I made $800 monthly, no solicit- month after month in your publication ing, no goods to buy. Why not you? Details free. It. Mc- Chemistry Ncwn. 326 Wilkinson, Omaha, Neb. and the results have always come out way on top. Very truly yours, Develop latent finger prints with non -eradicating powders. At Last! Diamond Rival Discovered! Amazing blue white With directions 35 Rajah Gem Astounds jewelry world and deceives experts. OAKS MAGICAL CO. cents prepaid. The Rogers Laboratory, Beautiful sample case free! $100 weekly! Write quick! Rib Lake, Wis. Rajah Diamond Co., Dept. Fll, Salisbury, N. C. Experimenters Chemical apparatus and radio supplies. Marvelous New Invention 400 per cent profit, liquid Catalog 5c. Chemical Apparatus Co., 4400 West End, quick mend for hosiery and fabrics, tremendous demand. Read Our Rates at Top of Page Chicago. Over hundred other fast sellers. Local and general agents. J. E. Johnson Co., Dept. 840, 69 E. South Water St.. 11111111111111111111lllll 111111111111111111111111 lllll 1111111111111111111111111111111111111111111111lllluavamuamuuuuum Chicago. Then Send Your Order 15 to $15 daily (Sworn proof) Introducing New Guaran- Coins teed Hosiery. Most wear or replaced free. No capital or 44 Different 50 exnerionre required. You simply write orders. We deliver Marvelous Invention! Does away with phonograph needles. Coins $1.00. assorted bills $1.00 11 dif- and collect. YOUR PAY DAILY, monthly bonus besides. ferent coins or 11 different bills 25c. Otto Oddehon, Inde- Preserves records. Saves $25 in needles. Pays $90 weekly. pendence. Missouri. Spare time satisfactory. Samples furnished. All colors, Sample on approval if requested. Everplay, Desk E -4, Mc- grades including. silks, listes, chiffons. Maeochee Textile Chicago. Bldg., 1111111111111111111111111 1 1 1 Clurg l l l 1 1 u m 1 1 1 1 1 1 u 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 u 1, 1 1 1 u 1 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Company, Card 6704, Cincinnati, Ohio. u u n 0 / 1., 11 11 u Mirrors Re- Silvered at Home, Costs Less 5 cents per Selling Like Blazes! Eleven piece toilet goods assortment Correspondence Courses square foot; you charge 75 cents. Immense profits, plat- at $2.00 with two piece carving set FREE to your custom- ing like new, brassy. worn -off autaparts, reflectors, table- in. 100% profit. Davis Products Co., Dept. 67, 1311 Car- ware, stoves, etc.. outfits furnished. Details FREE. roll, Chicago. Used correspondence school courses. All kinds. Sold Sprinkle, Plater, 955, Marion, Indiana. on repurchase basis. Ilig saving. Money back guarantee. Lists free. (Courses bought). Lee Mountain, Pisgah, Ala - Over 1060/ Profit. Self Lighting Gas and Cigar Light- "Gets-U-Out" Tiro Lug. New Patented Auto Accessory. bates. ers. Everybody interested. repeat business. Sell lndivld. Just out. One minute demonstration. Sure sale. Absolutely uals, dealers, subagents. Particulars FREE. S. I. Bern- prevents auto getting stuck in mud, sand or snow. Big 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 hardt, 127 West 30th, New York. profits. Money back guarantee. Write for exclusive sales territory. Arthur J. Benson, 47th and Shields Ave., Room A large Hosiery concern wants responsible men and wo- 419. Duplicator men as local representatives working spare time. Big sue- Chicago. pegs. Write for details. Jennings Co., Dept. 655, Dayton. Rotosoeed Duplicator, like new, ready to operate, $30.00. Ohio. Furniture refinishing, polishing, painting, handyman Anton Ponsetti, Spring Valley, Illinois. shop; wonderful profits; start yours mi nearly nothing. John Big Money-fast sales, every owner buys gold initials Braceland, 1459 So. u,I111111111111111ullluuu,uel,eueuueeuuueumolomuuuuuiluuu,nre,mumuuuuunulll Ninth, Philadelphia, 1 for his auto. You charge $1.50. make $1.44. Ten orders Pa. 111111 11111 daily easy. Samples free. World Monogram, Dept 32, Newark, N. J. Agents- Snappiest household line on earth. Red hot Educational sellers, steady repeaters Build splendid -100% profit. 300 light weight. business making chipped glass number fast selling, popular priced necessities. Selling outfit Corresnondenee and name plates. Particulars free. Simplex Co., Dept. 93, free. Get busy quick today, eourses. All schools. Lowest prices. Terms. 1133 Broadway, New York. -Write postal will do. Ameri- Catalog Free. Mention Subjot. Fred. Goetz, 440 -H Sansome, can Products Co., 5809 American Bldg., Cincinnati, Ohio. San Francisco. Earn $5.00 Every Hour Monogramming Automobiles. it's Succeed With easy with our gold transfer letters, Your Own Products. Make them yourself. Used Correspondence School courses save over half. Bar- cost 5e. Get $1.50. Formulas, Processes, Trade -Secrets. Modern Master Sample free. "Raleo," 1013 Washington, Boston, Mass. Catalog methods. gain catalog 1000 courses free. Used courses bought. Stu- free. D. Thaxly Co., Washington, D. C. dents' Exchange, Dept. A, 47 West 42d Street, New York.

www.americanradiohistory.com Science and Invention for April,1926 Farms, Land, etc. How To Entertain Pa Seized and sold for taxes. 43s acres on Georgian Bay Plays, musical comedies and reviews, minstrel music, Patents P $40.50. 12',4 acres fur farm $43.20. 25 acres hunting blackface skits, vaudeville acts, monologs, dialogs, recita- henslve, expe campsite $60.30. 50 acres Muskota Lake District $63.00. tions, entertainments, musical readings, stage handbooks. development 100 acres hunting and trapping $91.80. 160 acres fans make -up goods. Rig catalog free. T. S. Denison & Co.. 623 nished witho Canadian West $315.00. Mining claim near mines that So. Wabash, Dept. 99, Chicago. for disclosin_ have paid millions $378.05 These prices are not first Owen Bldg., payments, or price Der acre. but the total amount asked. York. Also beautifully situated hunting and fishing camps for moose, deer, caribou, ducks, partridge, trout. whitefish, Insects Wanted Patents: bass, etc., best in North America. Summer cottage altes. Office. Cons farms, heavily wooded tracts. acreages large and small, for Why Not Spend Spring, Summer and Fall gathering 150 Nassau pleasure and investment. all offered at ten cents on the butterflies. insects? I buy hundreds of kinds for collections. Inventors dollar of their value, and on easy monthly payments of $5. Some worth $1 to $7 each. Simple outdoor work w$Us my tain simple and upwards. Send for illustrated list describing the above instructions, pictures, price -list. Send 10 cents (not book Patent - and hundreds of other properties seized and sold for taxes. stamps) for my illustrated Prospectus before sending but- Lacey, 644 Every property is fully described and offered at a stated terflies. Mr. Sinclair, Dealer in Insects, Dept. 41, Box Millions spe price. Send no money. Send for list today so you will 1424, San Diego, Calif. have first choice. Tax Sale Service, Room 618, 72 Quee7 Patent yours a Street, West, Toronto 2. how to protect Ontario, Canada. we help you 1111111,1111II111...... 1.1111111111111111,1111111111111111111111111,1.11.1,,,. 1.11111,11.,111.1111.11n11am...... 1.1111.111mumuv Instruction Kresge Bldg., 1 Patents-Send For Advertisers Correspondence Courses said complete: one -third usual signed asid witness prices because slightly used; easy terms; money back Lancaster and All I write fetters. folders. booklets, complete followap for guarantee. All schools and subjects. Write for special United States and manufacturers. snail order dealers. Long experience. Write Free catalog. Courses bought for cash. Economy Edu- D. C. for details. L. Taylor, Box 344. Freeport, Ill. cator Service. H202. West 99th St, New York. Monroe E. Miller, O Drawings- Cuts-Printing -that tell your story. Webby 611111111111111111111011111111111111116666.66666111111111111111111111111111111616111111111111111111166.1111106111111111111 eut Lawyer, Mechanical, Art Engravers, Willoughby. Ohio. priority record blank grati Machinery and Tools Patenta: My in 11....11...11..11.11IIm11 fee lust W IOafof InIIIlnwnnwlllllllllllum1,11111111111uIIIIIIIl1111.i illl illllllllllllllII1111111a11e Frank T. Fuller, Washington, Concrete Building Block Machines and Molds. Catalogue E. For inventors free. Concrete Machine 5 Richard Babcock, Patent I Co., N. First St.. St. Louis, Mo. Trust Bldg., Washington, D. C. nm1.1.11.11111111011111111111111111111111111111.111 llenn111111111m1111111111111111111161111111111111111.111111111111111111 ®mmlmmmmmmmmmmm111nmmm111m1111111111n11111.1111 Unpatented Ideas Can Be Sold. I tell you how and help 11 you snake the sale. Free particulars (Copyrighted). Write Mail Order Business W. T. Greene, 808 denifer Bldg., Washington, D. C. Patents Your Cnemieal problems solved and working process fur- 51 Starts You mail order business. Particulars Free. nished for Five Dollars. Write me. W. Stedman Rich- Bela Co. (Importers), Los Angeles. inventions comm ere ial ized. Patented or unpatent:,. ards. Consulting Chemist. Box 2402, Boston. Mass. Write Adam Fisher Mtg. Co., 205 Enright. St. Louie. Mo. Business Progress. Magazine, The mail dealers' guide. Inventors-Get this pamphlet, "What to Invent." No Three months trial 25c. Landers Agency, 675 Upham St., 1111161111111111111111111111161111111111 1111 lllll 1111111/1111111111111/1111111111111/111111111111116111/11/1111111111111111111111111 theory or guess work, but things actually asked for by Maiden, Mass. manufacturers. Sent prepaid for only $1.00. Inventor's Photography Syndicate, 22 Paladium Bldg.. St. Louis, Mo. ,111111111111111111111111.11111,11111 1111111111111111111111111111111111111111111111111111111111111111111 11111111111111111111111111111111111, Cashing In-If you have a practical, useful inventions to Manufacturing Send Us Your Films. We develop, print, enlarge. Care. sell, write promptly American Patenta Corporation. Bar- fill attention to details that make superior quality pictures. rister Building, Washington, D. C. Rolls developed 9c, prints 3c each, trial 6 "x8" enlargement Mechanical Work: all branches. Perfect models. Articles in folder 40c. Wellington Photo Services, Riverdale, Md. U. S. and foreign patents, 'trademarks, moderate rates, manufactured to order. Reliable. l'arma Engineering u11n11111111nnnuunu11111111111111I111,11111111111111m111n1111111111 ...... :...11..,.11..1 22 years experience. George C. IIelaicke, 32 Union Square, Works. Brooklyn Station. Cleveland, Ohio. 11.11111,1, New York, registered In U. S. and Canada. New invented artielen for manufacturers, Tobler Engin- Photoplays Mechanical drawing and designing work. Send sketch for eering Bureau, Box 295, Waterbury. Conn. Wanted free estimation or write for free particulars. Tobler Engi- neering Bureau, Box 295. Waterbury, Conn. miummuumuumnurottrommtlittomettetatimmimmtnititumimmilliniumarrammilimilm $ $ $ For Ideas. Photonlay Plots considered in any form. Write for Suggestions for Inventors as to Inventions free booklet. Universal Scenario Corpora- needed. Price Miscellaneous tion, 223 Security Bldg., Western and Santa Monica Blvd., 50e. Tobler, Box 295, Waterbury, Conn. Hollywood. Calif.

111111111 .11111111' 11.11, 1.1111.11.1111111.1111,1111.1.111111,111.$1.6111.1m11.11.111111111111.11.111.1.1111111111111111: 111111111M Homeopathic and Brochemic preparations sent postpaid =OBI M11111111111111111177111MITITIM71171117111111111. to all parts of the world. Manual and booklets free. Hal- For the Photographer sey Bros, Co., 645 St. Clair St., Chicago, Ill. Established 1855. Printing Outfits and Supplies Meter Have you a Camera? Write for free sample of our big Campers! We supply croup car plans for amateur Print your own carda, stationery, circulars, etc. magazine. showing how builders. Pacific Vehicle Works, Box 574, Los Angeles. paper, to make better pictures and earn Complete outfits $8.85; Job Presses $1.2, $35; Rotary $150. .honey. American Photography, 118 Camera House, Boston, Beautiful registered bull pups $15. Bulldogs. 501 Rock- Until for others, big profit. All easy, rules sent. Write 17, Mass. wood, Dallas, Texas. for catalog presses. type, paper, etc. Press Company. A -6 Conn. Gummed Labels, Name and Address. 500. 2 lines 30e. 3 yferiden, ,111,1 11.1 , 11,1111,11111111111,1111111111111111,,,,1,,,111111.1111 , , 1,,,,,, ..,11, .,,,,,,111..11, ....1.11.1111.1.,1.1.,,11111., .,,11,,,, lines 50e. Catalogue. Eastern Label Co., Y Clintonville, Build Your Own: $1.00 up. Simple, practical. Blue Games and Conn. Print, etc., 50e. Arts -Craft Press, Willoughby, Ohio. Entertainment Moving Picture Films! Westerns, Comedies, Cartoons, Everything' Big Assortment, $1.00. Write Quick. No Free with $25 order our large die box. Send 20e for our stamps. W. C. Gillis, 52 Winship St., Brighton. blass. Salesmen Wanted large catalogue of tricks, puzzles, wigs, sensational es- capes. Oaks Magical Co., Dept. 549. Oshkosh. Wis. Take orders for coffee. sugar. Gour, meats, canned goods, Book of Magie, Set Trick Cards, and illustrated Catalog Motorcycles -Bicycles staple groceries. also paints. radio sets. tires, auto and trac- 10e. Piedmont Novelty Shop, Box 631. Danville. Va. tor oils. No capital or bond required. We deliver and col- Magie tricks, books, novelties. Catalogue FREE. Peltier. Don't buy a Bicycle Motor Attachment until you get lect. Permanent business. Big pay. Write at once. Dept. lA, 58 Skeele Wiltimansett, Mass. our catalogue and prices. Shaw Mfg. Co.. Dept. 8, Hitchcock -Hill Co., Dept. 83, Chicago. St Galesburg. Kansan. Tricks- Jokes -Novelties. Catalog free. Kelley, 32 Ells- Sells for worth, Worcester, Mass. ,1111111111111nnn11n111111111111nn11111nnnnuunununu111n1nnnm..1111n1111111.11n1m11muumnunnun11u111 $9.75. Prints ad on wrapping paper, envelopes, etc. $4.00 commission. Send 10c for sample work. Auto- matic Ad-Stamper, Joplin, Mo. 1111771111.61611111211.11111116111111111111.6111111111 11111111111111111111111111111111lllll 11111111111111101/1160111111111111111141 Musical Instruments 1m1. 111. 1111.11.1.. 11111111. 11I1111I1II1111111111111.1I1... 111. .1 ...... 11..,,1.,,,1,. 111,. 111.1.11 .1.1,..111.,111,1111.,111111111 Health Violins -Deep. ktellow, Soulful -on easy credit terms. High grade, wonderful instrumenta of my own make, Devel- Song Poems Tobacco Habit Banished. No matter how long you have opment of many years' expertness. Write for book. Gustav A. Henning, been a victim, no matter how strong your craving, no mot' 2424 Gaylord St.. Denver. Colo. Song Poem Writers -Senti for proposition. Ray Hibbeler, .11.1111n11111.1111111n11116111M11111.1111M111111111111 ter in what form you use tobacco. there is help for you. n1111111111111111111,111111111111.1111 1 ....1.1111111111111111.1111.1. D24, 4040 Dickens Ave.. Chicago. Just send postcard or letter for our Free Book. It explains everything. Newell Pharmacal Co., Dept. 788, Clayton Sta- Song poems wanted. Radio Publicity. Bureau 8. 24 tion, St. Louis, Mo. Old Coins Times Square Station, New York. Edison's Way-Scientific Proof. Natural Diet, 20c. Bet- California Gold, quarter size, 27c; half- dollar size, 53e. ter Foods Bureau, Willoughby, Ohio. Columbian nickel and catalogue, 10c. Norman Shultz, Box Stammering 146, Colorado Springs, Colo. German Gavt. Bond. 100,000 Mk. 1923 $1.40. 5,000,000 St- Stu- T- T- Tering and Stammering Cured at Home. Mk bond 1924, $1.50. 100.000 Mk. bill and catalogue 10e. Instructive booklet free. Walter McDonnell, 105 Arcade. Help Wanted Norman Shultz, Colorado Springs, Colorado. 1126 Granville Ave., Chicago. Ill. Bunker Hill Half Dollar 95e. Columbian Half Dollar 75e. Stop Stammering. All speech defects successfully cor- Large Cent rected. Samuel Robbins, 399 Boylston St., Boston. Silvering Mirrors, French plate. Easily learned, im- and bargain price list 10c. Marcy, Box 483, Muskogee, Okla. 111111.1...111111111111111111111111111111.111 mense profits. Plans free. Wear Mirror Works, Dept. 36, ...... 1..11,11.11...11 i..11...... ,,1 1..,1....1...,.....11...... 1...... 1 Excelsior Springs, Mo. ,m1..11...1..n11..1.1....1...1...1111..111111111mmn11m111111e11n nn111111111111n1un1111n1111n.111...... 11...... 1.11.111 Stamps and Coins All men -women, 18 to 60, wanting to qualify for Govern- Old Money Wanted ment Position, $140 -$225 monthly, local or traveling, Stamps 100 All Different 3 tenta. S. I. Quaker Stamp write, Mr. Ozment, 293, St. Louis, Mo., immediately. $2 to $500 Each paid for hundreds of Old or Odd Coins. Company, Toledo. O. Keep all old money, it may be very valuable. Send 10c for m Detective Earn Big Money. Travel. Excellent opportunity. new illustrated Coin Value Book, 4x6. Guaranteed Prices. Great demand everywhere. Experience unnecessary. Par- Get Posted, We pay Cash. Clarke Coin Company, 14 Stories or Manuscripts Wanted ticulars free. Write. American Detective System, 1974 Street. LeRoy, N. Y. Broadway. N. Y. Stories. poems, descriptive articles. plays, etc., are wanted Detectives Needed Everywhere. Work home or travel. for publication. Submit Mss or write Literary Bureau, 165, Experience unnecessary. Write. George Wagner, former Patent Attorneys Hannibal, Mo. Government Detective, 1968 Broadway, N. Y. Patents. Send for free booklet. Highest references. Qualify for $150 -$300 railroad Jobs. Fireman, Brake- Best results, Promptness assured. Send model or drawing Typewriters and Ribbons man, Baggageman. Sleeping Car or Train Porter. 897 Por examination and opinion. Watson E. Coleman. Patent Railway Bureau, East St. Louis, Ill. Attorney. 644 G Street, N. W., Washington, D. C. Used Typewriters, $16.50 Guaranteeed. " Ribbons 3 for $1.00. Wm. 4 Unpatented Ideas Can Be Sold. I tell you how and help Phelps, Franklin Street. New York. Earn 910 to 920 per day. Learn Sign Painting. Auto you make the sale. Typewriters, Show Free particulars (Copyrighted 19231. all standard makes. $10 up. Fully guaranteed. Painting, Paperhanging. Decorating, Card writing at Write W. T. Greene. 809 denifer Bldg.. Washington, D. C. Free trial. Write for complete illustrated lists. Northwestern a real school -no mail courses. All practical training -short Exchange. 121 N. Francisco Ave., time. Low cost Chicago Painting School, 132. West Austin "Inventor's Advisor," the valuable Patentbook with 139 Chicago. Ave., Chicago, Ill. Mechanical movements and illustrations, sent free upon request. M. I. Labiner, Patent Attorney, 3 Park Row, York. Be a Detective, Work home or travel. Experience un- New Ventriloquism necessary. Particulars free. Write. George Wagner, former Get your own patents. Application blanks. complete government detective, 1968 Broadway, N. Y. Instructions $1. Cutting Bros., Campbell. Calif. Ventriloquism taught almost anyone at home. Small cost. Patenta. Send Ic. stamp today for particulars and proof. Geo. W. Time counts in applying for patents. Don't Smith. Room Bars me.ke money at home copying names. Address risk delay in protecting your ideas. Send S77, 125 N. Jefferson Ave.. Peoria, Ill. Wright, 150 N. 15th St., East Orange. N. J. sketch or model for instructions or write for Free book, "How to Obtain a Patent" and Record of Invention" form. No charge for U. S. Government Jobs. Men -women 1$ up. $95 to $250 information on how to proceed. Communications strictly Wanted month. Steady work. Life positions. Short hours. Vaca- confidential. Prompt, careful, efficient service. Clarence tion with pay. Common education sufficient with our A. O'Brien, Registered Patent Attorney, 92F Security Bank Detectives Earn big Money. Work home or travel. Ex- coaching. List positions and full partlenlars, free. Write ltutlding (directly across street from patent office), Wash- today sure. Franklin Institute, Dept P19, Rochester. N. Y. ington, perience unnecessary. Write. George Wagner, former Gov- D. C. See page 1041. t ernment Detective, 1968 Broadway, N. Y.

www.americanradiohistory.com Science and Invention for April, 1926

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