EXPERIMENTER PUBLISHING COMPANY, 230 FIFTH AVENUE, NEW YORK www.americanradiohistory.com Win a Nash Sedan or $2,750.00 in Cash Someone who answers this ad will receive, absolutely free, a fully equipped 7 -Passenger, ad- vanced Six Nash Sedan, or its full value in cash ($2,000.00). We are also giving away a Dodge Sedan, a Brunswick Phonograph and many other valuable prizes-besides Hundreds of Dollars in Cash. This offer is open to anyone living in the U. S. A. outside of Chicago. Solve This Puzzle There are 7 cars in the circle. By drawing 3 straight lines you can put each one in a space by itself. It may mean winning a prize if you send me your answer right away.,. $750.00 for Promptness In addition to the many valuable prizes and Hundreds of Dollars in Cash, we are also giving a Special Prize of $750.00 in "Cash for Promptness. First prize winner will receive $2,750.00 in cash, or the Nash Sedan and $750.00 in cash. In case of ties duplicate prizes will be awarded each one tying. Solve the puzzle right away and send me your answer together with your name and adress plainly John T. Adams, Mgr., Dept. 3798 written. $4,500.00 in prizes EVERYBODY RE - 323 S. Peoria St., Chicago, Ill. WARDED. - Here is my answen to the puzzle. My Name John T. Adams, Mgr. Address Dept. 3793 323 So. Peoria St. Chicago, Ill. www.americanradiohistory.com L 577 Science and Invention for November, 1928 Training Employment FINDING you PREPAIING the better -paid you to fil. a fine position and Drafting job at PLACING you a substantial in it, or money refunded . raise in pay .. ... Come into DraRin can read blue -prints and draw plans are "sitting pretty" Men who every building, all these days. No wonder, when you consider that every machine, start on the Drafting table! Intensive production, record -break- industrial activities for expert Draftsmen ing construction operations, have created a great demand capable of designing and calculating original plans. $50 to y$125 a week paid to Expert Draftsmen Drafting isn't just one line of work-it reaches out Get this point-that Automotive into the Electrical, Manufacturing, Building Construction, industries. That is why you'll find well -paid Drafting and Structural vacancies positions advertised in all industrial centers of the U. S. 70,000 12 months. And that is why I advise men to go into reported in the past college Drafting, particularly if handicapped by lack of high-school or you are in competition with high-school and college education. Today to win. graduates for the better -paid jobs. You must have specializedtraining The Entering Wedge to Success A Drafting job GUARANTEED Manufacturing Lines paying 50% more than you earn today in all Building and Drafting, too, because it can be QUICKLY learned at home, in spare time-with- of cost! I recommend sure there -or not a penny out quitting your job, without losing a day's time or a dollar in pay. Because you're on terms of only waiting when you are ready for it. And because the work is so fascinat- Now, at a cost you can afford, will be a good position con- BUY a fine ing and offers better -than-ordinary chances for advancement. For the Draftsman is in close $6 per month, you can actually right in line for promotion to Superintendent increase in tact with important work and BIG MEN. and he is Drafting position and a substantial and other executive positions. pay. A million -dollar institution guarantees both-the training, then the employment. Under money -back penalty. This agreement brings you your SECOND Drafting Lessons CHANCE. To repair a neglected education, to specialize, to change to a line where you can get 'J9auteFREE. and investigate itl 3 ahead more rapidly. Read it, American School to prove you can learn at The spare time! Chartered 30 years as an EDUCATIONAL in- home, in your stitution and like the best resident schools and You will never have a more seri- colleges, conducted NOT FOR PROFIT. We ous personal problem than decid- offer complete, thorough up-to-date instruc- ing your future life-work-so we tion, built by 200 leading Educators, Engi- merely urge you to LOOK INTO neers and Execu- how you like it, see if you learn as unique in- Drafting. See tives. A readily as most men do, get the facts about the op- struction, built to portunities, the salaries paid. the jobs open, the meet the specifica- for promotion. well -paid chances tions of This is why, on receipt jobs as laid down of your name, we will by employers them- send you the first three selves, yet simplified for by lessons of our Drafting ready understanding course without cost or men with- only common obligation. schooling. And we are the first in the home study field to recog- nize the need of giving a COM- PLETE SERVICE to ambitious men O. C. MILLER, Director Extension Work. -training, plus employment. Which THE AMERICAN SCHOOL, as you are, supplies the D-8594 Drexel O. C. MILLER takes you Dept. Ave. & 58th St., Extension Work equipment you lack, and lands you Chicago, uuuuts Director seek. Without in the better job you Please send without cost or obligation: risk to you! t. Three Drafting Lessons. 2. Facts about the opportunities in Drafting. 3. Your Guarantee to train and place me under money-back penalty. Name )iiencaî Address Occupation Dept. D-8294 Drexel Ave. & 58th St. ,Chicago, Ill. Age W Please say you saw it in SCIENCE and INVENTION www.americanradiohistory.com ente 0.52 ention Formerly ELECTRICAL EXPERIMENTER COMBINED WITH "THE EXPERIMENTER" EDITORIAL, ADVERTISING AND GENERAL OFFICES: 230 Fifth Avenue, New York City NOVEMBER 1928 Published by Experimenter Publishing Company, Inc. H. Gernsback, Pres.: No. 7 S. Gernsback, Vire-Pres. and Treas.; Alfred A. Cohen, Sec'y Publishers of SCIENCE AND INVENTION, RADIO NEWS, RADIO LISTENERS' GUIDE and AMAZING STORIES Editorial Staff Contributing Editors v) - HUGO GERNSBACK, Editor -in -Chief. Astronomy- Automotive Subjects- H. WINFIELD SECOR, Managing Editor. Dr. Donald H. Menzel, Ph.D., Lich George A. Luers W. Observatory; Radio- A. P. Peck, Herbert T. O'CONOR SLOANE, PIi. J. Luyten, of the Harvard College Observatory. Hayden. D., Entomology and Allied Subjects- Magic and Psychic Phenomena- Associate Dr. Ernest Joseph Dunninger, Joseph F. Rinn, Edward Merlin. Editor Physics- Bade, Ph.D. Foreign Correspondents- JOSEPH H. KRAUS, Field Editor. Dr. Alfred Dr. Harold F. Richards. Ph.D., Ernest K. Chapin, Gradenwitz, Germany; Dr. H. Becher. PAUL WELKER, Radio Editor. M.A., Dr. Donald H. Menzel, Ph.D. Germany; C. A. Oldroyd, England; S. Leonard Bas - tin, England; Count A. S. GERNSBACK. Wrinkles Editor. Chemistry- N. Mlrzaoff, France; Ilubert Raymond Slouka, Czecho-Slovakia; P. C. van Petegem, Bol - B. Wailes, Dr. Ernest Bade, Ph.D. land; Richard Neumann, Austria. IN DECEMBER ISSUE CONTENTS Pump Invention Makes OF THIS NUMBER a Fortune GENERAL SCIENCE CHEMISTRY Editorial 585 By Hugo Gernsback Experimental Chemistry and Electrics The absorbing human -interest Edited 610 story of a pump inventor Moving Scaffold Aids Masons 586 by T. O'Conor Sloane, Ph.D. who Television Directs Two Orchestras Food Adulteration 611 587 By William had a radically new idea that A Motor Bus Sleeper 588 Lemkin, Ph.D. brought him fame and fortune. The Month's Scientific News Illustrated 589 The story of a successful in- By George Wall HOME MOVIES How Lindbergh's Famous Engine was Manu- ventor that you cannot afford Home Movies-Monthly Department 608 factured 590 Conducted by Boo to miss. By H. W. Sccor Bennett How to Save Coal 592 TELEVISION City of the Future By C. D. Kee/y, Mechanical Engineer What will the large Entertaining with Ilypnosis 593 Popular Television-A New Monthly Feature 618 city of By Rena Murar Stereoscopic to -morrow look like? Will we Television Sciencé Probes Spider's Secrets 594 Radio Movies 622 have skyscrapers or under- By Uthai Vincent Wilcox ground apartment houses ? Read Inventors Ease Mothers' Cares 596 RADIO By Rhys G. 77tackwell the opinion of eminent engineers Plane Broadcasts Radio Photo Movie Tricks 598 New 624 and architects. Illustrated By Joseph Radio Devices 625 with H. Kraus Mid -Ocean Radiophone attractive pictures. Is Civilized Man Losing His Sense of Smell.? 600 626 By Walter Raleigh Radio Oracle 627 Money! Danger-High Vacuum 601 An interesting and popularly By Emery G. Gregory AUTOMOTIVE Scientific Progress 602 Motor Hints written article showing the sci- Peak Load 605 Conducted 604 By E. G. -Martin by G. A. Leers ence behind the making and dis- A Motor Bus Sleeper Magic-A Monthly Feature 606 588 tribution of Uncle Sam's legal By Duuningcr tender. Scientific Questions 607 HOW -TO -MAKE -IT Jupiter in a Stereoscope 607 Building Television Constructor By Donald H. Menzel, a Speed Boat 612 Ph.D., Lick Observatory \\'ood Turning for the Amateur-No. All the latest information with Readers Forum 617 5 of a Series 614 clear drawings will be presented Scientific Humor 628 By H. L. Weatherby Latest Patents 629 How -To -Make -It for the benefit of the television The Oracle 630 Wrinkles, 615 Patent Advice Recipes and Formulas 616 receiving set constructor. 640 Edited by S. Gernsback HOW TO SUBSCRIBE FOR "SCIENCE AND INVENTION." Send your name, address and remittance and money orders should be made payable to Experimenter to Experimenter Publishing Co., 230 Fifth Ave., New York City. Checks Publishing Co., Inc. Mention magazine desired, publish RADIO NEWS, AMAZING STORIES and RADIO LISTENERS' GUIDE.