Popular Science Monthly 1929: Vol 115 Table of Contents

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POPULAR SCIENCE MONTHLY Ao Table of Contents Volume 115 JULY TO DECEMBER _. 1929

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D) POPULAR SCIENCE MONTHLY JuLy, 1929 Table of Contents for July ~ LEADING ARTICLES T Automobiles What G t ara | Doomed to Die—and They Live! . _. . By Robert E. Martin 17 a too a glam = Will science reprieve radium victims from a lingering death? Wireless Beam Will Guide Segrave’s " Talking to the South Pole . p ‘ . 20 Challenger .. 64 Radio marvels that link the 1929 explorer to the world A Safety Pyre—200 Autos Fed to the : What John D. Rockefeller Has Done for Me A ag ‘5 SI fter T 65 By Henry Morton Robinson 21 ‘Sa san ump after Ten Years, A little-known side of the world’s richest man, as a saver of lives ys Expert. - 65 How to Break-In Your New Car . 84 How Air Giants Are Parked. . . If You’re Stalled in the Rain . . 88 Novel equipment for the intricate job of docking | a dirigible Finding Loose Bearings . . . . 88 Why Everyone Has a Double __. By Michel Mok 30 Light for the GasGage . . . . 88 Astonishing new facts about people who look alike — Pipe a Tool. . . . 88 Has Fame Made Lindy “High Hat”? . . By Donald E. Keyhoe 32 es ss + A new slant on the Lone Eagle, by one of those 4 know him best Aviation **Mystery Fish’? Outwit Scientists. : . By Tom White 41 How Air Giants Are Parked. . . 23 Thrills and romance with the salmon fleet 900 Milesin Balloon . . . . @ Learn to Fly with Larry Brent—PartV. . . ByLarry Brent 44 Plane Drops Stalled Motor . . . 24 A greenhorn pilot tells of his first landings ee Altitude. = Someday We'll Look Like This By Arthur A. Stuart 47 Wing Slots in Thrilling Test. | | 26 An advance view of your descendants a few thousand years hence Plane Lands by Parachute " 96 Speed and Your Car . By Alden P. Armagnac 48 A Plane Copied from Bats .. 26 How race track dare-devils are giving us better autos Line Agee yt Service for Planes. 27 Why Is Perpetual Motion Impossible? . . By Edwin W. Teale 54 76,000 Miles of Airways. . . 27 . F ?, : : F Air Mail Records Broken. . . . 27 A mechanical will-o’-the-wisp that still lures inventors A Real Flying Start . "OF Sky Luxury—Even Refrigerators! . des When You Takea Ride. . . . 28 “SPECIAL FEATURES First Race for Dirigibles. . . . 28 ¢ 8 ee The Navy’s New Carrier. . . . 28 Cover Design. ©... _—- + . .By Herbert Paus U. S. to Alaska—Nonstop . . . 28 Molding Plane Fuselages. . . . 28 Pinning Tails on — By Wallace Ames 4 Greatest Airship Hangar 28 Why few people take money out a Wall Street and keep it 11 Cents a Mile by _—_ « The Institute—Yours to Use __.. By F.G. Pryor 12 A 5,000-Mile Airway . —S How Popular Science Institute’s service solves readers’ buying prob- Teaching Pilots to Fly “Blind”. . 29 lems es Air Yacht. . . »- a Our Readers Say— ; ; 14 Hundred-Passenger Plane . . . 29 Parachute-Seats for P » co ae Climbs 722 Feet Nearer the Sun. By John E. Lodge 25 Sante ie ee, _ How a Daring Navy Flyer broke the world’s altitude 1 record Flyer Somersaults Twice in a Day, Back of the Month’s News... . . By Karl Vooght 50 and Lives. . 57 Significant comment on recent events in science Rats Attack the R-100 . 67 Unusual Men in the Public Eye. P , . , . — Takes Census of Alaskan 69 Thumb-nail sketches of people worth knowing —_ a How to Go Gunning for Distance By John Carr 70 Engineering A new bag of tricks for the man with a one-control radio aot we — . 3 ° Prize-Winning One-Tube Sets By Alfred P. Lane 71 ee a . Announcing awards in our receiver building contest Medeos Inte a Anchor for e2 Choosing the Best Roof _ . By Roger B. Whitman 74 Giant Elevator AWill Lift Thousand- Valuable suggestions for the hardest-worked part of the house Ton Vessels. . 62 Trellises Improve the Garden. _. . .ByF. Clarke Hughes 78 May Pump North Sea to Win a Rich How to build all sorts at trifling expense New Land . . 68 a Ways to Polish Sheet Metal. By Edward Thatcher 80 Exceptional P eople ‘inishing brass, copper, and silver by hand or machine What John D. Rockefeller Has Done Editorials . ie: eo 82 for Me . 21 spe Has Fame Made Lindy i High Hat”? 32 How to Break-In Your —— — By Martin — 84 Ble Teaile the Dawn of Mea. 56 Gus and Joe tell what every purchaser should know , Statstastiivs #6 How to Test Your Squares ‘ : By Henry Simon 94 Chinese Artist “‘ Paints” with Post- Raising the accuracy of fine shopwork $ es + « s ee puly, 1929, Vol. 115, No.1. Popular Scyence B nom ma is published month- United States, its possessions, and Canada, $2.50; foreign countries, $3. Fong 250 Fourth Avenue, LR York. N. Y. e Popular Publishing contents of this magazine must not be reprinted without permission. In ¥ “= Entered as second-class matter . 28, t the Post Office at senting B its editorial columns way oy stories of new products of applied New York under the act of “March 3, 1879; additional entry as second-class science, Popular Science Month nly does not underwrite the business met matter at Ow Illinois. Entered as senenge lass matter at the bay] Office of the individuals or = ucing them. The use of Popular Selence Department, Canada. Printed in U. 8. Copyright, 1929, by the Popular - Monthly articles for stock- schemes is never eqtheriee, oO. B. Science Publishing Co., Inc. Single copy, ADs cents. Yearly su’ scriptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Seoretary.

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Jury, 1929 ' / POPULAR SCIENCE MONTHLY 3 Gar Wood, Jr., Is a Chip off the Old ¥ Card Holder Aids Memory of Bridge 7 A Lofty Mountain Range Found Block. 67 Novices . 60 under the Sea 65 Invents a Machine to Trace Ship New Electric ‘Lamp Bulbs Clean Sea Water by Freight for New Chi- Movements. . ee os Themselves. . 61 cago Aquarium. . 65 Savior of the Birds ’ . 187 Luminous Watch Shows the Way to “Mechanical Brains” Rule New Makes Watches Keep Time . . 188 the Keyhole : 63 York Traffic. . 65 —— Winged Speed Boat All but Cave Men Lived in Nevada 3,000 ° ies . 64 Years Ago . 66 Health and Hy guene Handle Tightens "Strings of New “Gassed”” Eggs Kept Fresh by New Why You Lose Five Pounds in the Tennis Racket .. 66 Process . 66 Summer. . 51 Air Horn for Locomotive. . 66 Lampblack Prevents Fires from Surgical Tools 2, 000 Years Old Un- Rotating Disks Measure Ripeness o of “Static” Sparks. 66 earthed .. 58 Tomatoes 66 Our Food May Give Us Squirrel New Serum Substitute in Bicod Ice Cream Gun Serves Sundaes in Chins. . 68 Transfusions. . 58 Cones. 66 Many Kinds of Precious Stones in Tests Vindicate Some Old ‘Home Submarine Rescue Pontoons Pass America. . 69 Remedies” .. ; 60 Crash Test .. 67 Colored Glass Produced by Addition ——_ Razor Needs No Blades nor of Metals. . 69 ‘ " ther... 68 Diamond Fields Once Home of Stone Laboratory Discoveries | A Pencil That Lights Your Cigarette 69 Ago Men. ‘inet The Lamps of the Future? . . . 50 Talking Movie Outfit forthe Home . 69 Going Back to the Farm . 139 Fuel Gas from Scrap Iron . . . 52 Improved Diesel Engine . - 165 Electricity from Heat. . 53 Electricity May Have New Rival in Radio For the Home Owner Industry. . 59 Choosi Einstein Presents Theory i in Simpler Talking to the South Pole .. 20 | « lise” the Best Roof . . . . 74 Terms. 60 Now 20,000,000 Radio Sets in the r remises Improve the Garden . . 78 Advances New Theory ‘for Color World : 61 A Lily Pond Needn’t Cost Much . 79 Blindness. . . ..... 8 How to Go Gunning for Distance 70 How to Read Blueprints - 104 Prize-Winning One-Tube Sets 71 Wiring a Vase for Lights . 112 A B C’s of Radio . ‘ 73 Nature Water Pipes for Your Antenna . 73 Hint he Mech ° Giant African Bullfrog Weighs Ten Curing the Hum . 73 ints for the Mechanic Pounds . . - a « & Hum and Speaker Quality 73 | How to Test Your Squares . . . 94 a —— Nuts Look Like - Correcting Milling Arbor . . . 96 ullalo Heads. Simple Lamp Holder for Lathe. . 9 Sharks and 60-Foot Whale in Thrill- Unusual Facts and Ideas Gridiog 2 ta ; ? ‘ 96 ing Battle ; i « = Doomed to Die—and They Live! 17 Inexpensive Jig for Offset Bends . 96 Giant Turtle 300 Years Old . . 147 Why Everyone Has a Double 30 Old Bill Says—__.. 96 “Mystery =. Outwit Seti . 4 a V a Grinding Compound pe ° Someday We'll Look Like This . 47 en You Mount a Grinding Whee New Devices for the Home | [eke Gives Up Roman Galley rH Ladder and Ironing Boardin One . 76 = s Speak a Precise Lan- Press a Button and the Toast Turns 76 52 Ideas for the Handy Man New Fiber Plates Save Dishwashing 76 How “Much Do You Know about , , One Utensil Is Teakettle, Preserve Firearms? . . 52 Homemade Electric Coil for Decorat- Kettle, and Boiling Pot. 76 | Why Stamps Come Off .. 53 ing Wood 79 Automatic Table Grill Resembles Why Is Perpetual Motion Impossible 54 Simple Ways to Polish Sheet Brass, Radio Set. 76 Explaining the Mystery of the “ Hu- Copper and Silver ._. . 80 Indirect Light for Your Bridge Table 76 man Cannon Ball” Thriller 57 How to Copy an Old Sea Chest . 81 Folding Oven for Table Stove . . 76 Battleship Fights Big Seas 57 Building a Fast Yacht Model . . 86 New Knife Sharpener Has Adjustable Japanese Taller in America .. 58 | A ‘Wood Turner’s Bag of Tricks. . 90 Stone. . "6 Novel Uses for Tantalum, Silvery- Photographing Reflections. 98 Sink Drainer Ww oshes Like Tire Pump va | White Metal. . 59 How to Shape an maaan "Ta- Miniature Sewing Machine Easy to This Hillside Home Has a Stairway pered Stand ‘ 100 Carry and Set Up... "7 of Fountains. . 59 Your Shadow Stays Behind. . . 102 It Makes Toasters and Percolators Bantams Aid in War o on Insect Pests 59 Boy Builds Gas-Station Model . . 108 Automatic . "7 Headphones in Theater ._. 60 How to Make a Neat Wrought-Iron One Leg of Bridge Table Unfolds All 77 Auction Bridge Taught by New Soli- Bracket . 108 Clothes Washer Has 12 Speeds . . 177 taire Method . 61 Blueprints for Your HomeWorkshop 109 Goes Up for Washing, Down for Outboard Motor Boats Race in Magic-Cross Block Puzzle; 110 Storing, When You Turn Crank . 77 Swimming Pool. . 62 How to Test Alloy Steels . . . Ill Novel Dish Keeps Cheese Fresh. . 77 Fight Fire by Freezing It with “Fizz” Support for Lamp Shade . 118 Attachment Governs Iron Heat. . 77 Gas 62 Bench Magnifying Glass . 118 Forest of Odd Dwarf Trees Grown n by How to Cut Glass Square. . 118 “Surgery” . ‘ 63 Revolving Toy Traffic Sign . . 114 New Processes and Useful ry Plants. . 63 | Patching Concrete gg oo alata 115 ; The World Bathes in Yankee Tubs. 63 Fixing Composition Roo’ ingles 118 Inventions Shade for Kansas . 63 Blueprints for Builders of Model New Electric Saw Makes 29 Dif- Trans-Atlantic Lifeboat Rescued by Airplanes. . 3% 125 ferent Cuts . 58 Steamer. . 64 Garbage Can Holder . . 126 Limousine Fire Engine the Latest in Italian Submarine Dives 383 Feet—- Truck for Outboard Motor . . 128 eras = © UC ; . 64 § Easily Made Bench Stop . 128 In This Issue—Hundreds of Fascinating Articles Tell the Latest News of Laboratory Discoveries, Scientific Triumphs, and Amazing New Inventions

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POPULAR SCIENCE MONTHLY Auecust, 1929

WHAT IS NEW THIS MONTH

Table of Contents for August

LEADING ARTICLES sf Astronomy

Taught Himself to Fly and Broke a World’s Record . By Michel Mok 17 Comets Hauled f; he Nw a ride to fame ot an ex-cowboy and a former railroad y= Solar System? npn Oy 65 mechanic Future Trip to the Stars s Portrayed Now—Phone Home froma Train! ._. . « -— - = « te 650 Miles by Plane for $4. 68! | (21 Valuable information presented in vivid pictures. Three Plan'to GirdleWorld . . 2% Model Planes in Amazing Flights. F . By Edwin W. Teale 55 First Rocket Plane __.. 26 Thrills and surprises in flying miniature machines Huge Fiying Boats for Great meee. wipe - 26 An Airplane “Plow Horse” . . 27 SPECIAL FEATURES ane = Navigate... . F . ox of Fo; [ -. * eS oe Cover Design . . . . . . . . . By Herbert Paus New 500- Mile Beseen. . i. «5 Ot A $15,000 Trifle . . By Wallace Ames 4 Air Mail Saves a Day . . Be The financial editor’s ‘monthly counsel _ “Lindy” Oils the Famil “Car” 28 What Insulation Really Does . By Collins P. Bliss, M.A. 12 Maps Alaska from the - . 28 Popular Science Institute offers helpful advice to home builders New Valveless Motor. . . . 28 Our Readers Say _ . ‘tee Oe ee ee eee eee A Perilous Perch . . - . - 28 Shot froma Warship . . . . 28 People in the Public Eye ’ , ‘ ‘ . 30 14,082 Student Pilots. . . . 29 Little stories of unusual folks you d like to know Checking the Air Records . . 29 Back of the Month’s News . . . By Karl Vooght 48 Plane Dispatchers Now . . . 29 Absorbing facts behind the latest discoveries A Monoplane-Biplane. . . . 29 Beware of Radio Bargains! . ‘ ‘ . As Told to Newton Burke 70 Safety Overalls. . . . . . 29 Timely hints for the set buyer , Cures Engine Cough . . . . 29 Two New Tubes—What They Do . .By Alfred P. Lane 71 aa: ** * se How new equipment adds A and distance amous Eiguts =. + = P Are You Interested in Aviation? . 41 Lining the Rooms of Your House . . . By Roger B. Whitman 74 Model Planes in Amazing Flights 55 An expert’s practical advice on inside wall construction America’s Fastest Flyer . . . 136 Your Motorized Workshop . By William W. Klenke 78 Directions for making a Colonial footstool , ‘ New Ornaments for YourHome __. . . By Berton Elliot 80 Engineering Helpful hints for the amateur decorator C ¢ Brid 30 Editorials .__. ; = « 82 enius of Bridges . . . . - : Li rss = Dollars Your Car Can Save You ‘ ‘ _ By Martin Bunn 84 i, et tees Bridge : 51 Gus and Joe tell why it pays to own an automobile At the Throttle oh the “Bi Hog” 52 Tools That Help You See Better ___. . By Henry Simon % Invents a Power Plant to Harness How mirrors and magnifiers aid the machinist + Small Streams . . . . . 59

A it, 1929, Vol. 115, No. 2. Popular Science Monthhy is oy pets month- United States, its possessions, and Canada, $2.50; foreign countries, $3. The ugus ly at 250 Fourth Avenue, New York, N. Y., by the Topular blish: contents of this 8 magazine must not be reprinted without permission. In Inc. Entered as second-class matter ‘Des. 28, 1918, at the Post Office a senting in its editorial columns pomeress stories of new products of ap ied New York under the act of March 3, 1879; additional en entry as sesond-s1ase openes, Te Popular Science Monthly does not underwrite the business methods matter at Chicago, [linois. Entered as second-class matter at the Post Office of the individuals or concerns a -t them. The use of + wey Science schemes is never nw ag O. B. Capen, papervenens Canada. Printed in U. “S. A. Copyright, 1929, 7S e Popular Monthly articles for stock-sel ence Publishing Co., Inc. Single copy, 25 cents. Yearly su riptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Secretary.

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Aucust, 1929 POPULAR SCIENCE MONTHLY 3 i= Exceptional People ¥ New Processesand ** pet ed a pine ” ing rints Saeaaing = 3 = Inventions What Do ‘You Know about Time- . enius 0 ; . pieces? 1 A Man Who A Gees Does the Im- Now—Phone Home from a Train! 20 Philadelphia i in Miniature, a $100,. : possible 32 Refine Ore with Thunderbolts 49 000 Toy City 58 Builds Remarkable Scale Model a oe | Glue and Shoe Polish | 59 of Coal Mine. 58 | aR] rie “ewe” “ —_— he Pearls 25,000 Years Old Found in ~* sig sa Dishes All Day to Test Lights ye” Turns on ‘the 59 the Rocks. 60 ew Product... » >» + : Mountains of Waste Paper Sal- America’s Fastest Flyer > + ae Novel Pipe Wrench Grips Like a 62 vaged by Machinery P . 61 a a Skulls Used as Drinking Bowls . 61 Health and Hygiene Hi — aang Tool for the 62 | Strange Dance of Smoke Seen I mas Machine S ‘s under Microscope. 61 Cleaning the Air of Dust . . . 49 . — Bolt ine Sorts crews, 63 Army Tests Poison Gases on n Hosts Deadly Chemicals Purify City N 7 “Drat — C De. of Tadpoles .. 64 Drinking Water . 57 pr ve d fo ens ~ comps — 64 | Curious Mineral Squirms ‘and Drafty oe Better for Our signed for Precision . Sweats under Heat . . 64 Combines Shadow wanting. * with Health? . ; 61 Bae Punchi 64 | Warship’s Oarsmen Train in ‘the Oxygen Piped in Hospital , 63 A New Way roy “That E 65 Fighting Top . 64 Joy and Sorrow Upset the Diges- ew Way to Get That Exercise Secret of Film Pictures Found in tion, Says Expert. 66 Mechanical Archer Tests Arrows Cattle Food! 64 Germless Arctic Islands the H ~ ~— -_ " Shields 65 | Tunnel Diggers ‘Find Gold. . 65 Healthiest Spot? . . 68 tre y G pewriter amp — 65 | Ancient Roman House Had Fur- Scientists Above Par Physically . 69 Fl —— oe : nace and Bath . 65 — Board “Boy” Posts 66 | Five-Million-Dollar War on Fruit Laboratory Discoveries Microscope Casts Its Wonders on Phe Depth Finder M ay " Redete 68 A Poor Shot Led to Tinless Tin Pn OE as . . 68 Cans .. 50 Ste ight O —— a o 67 Germless Arctic Islands the Fountain of Racing Atoms May N = oc ‘Bee Read 68 Healthiest Spot? . . . 68 Explain Aurora . 62 Mech ee oo acy to _ Army Tanks “Lock Horns” . 69 Smartest Children Are Strongest . 62 “S “~ C mr I _— 69 | Spending Millions for War on Mos- — Rustless Steel Cuts Glass ae ee quitoes .. . 134 ike a Diamond ._. 63 Curious Facts Revealed by Pro- Photography peller Tests. . 67 | Aerial Photos by Night . 97 | For the Home Owner Camera _and Tiny Furnace Tell Rare Books on the — for All When Front Doors Need Paint . 90 How Fuel Burns... .. js «69 to Read ; 67 | Reproducing an Old Chair . . 104 _ How to Drain Your Ice Box ._ . 106 Nature Radio ne i mo i ot Sia . = Victim of the Rattler .. 51 Ten-Pound Radio Transmitter for = to" Make pe Paiioes. ’ 112 Tails Handicap Squirrel “Chan- Airplanes . 67 | Knotty Lumber for Boxes. . . 113 nel Swimmers” . 60 AB *s of Radio ° 73 Trellis for Flower Pot i 2 ‘s . 114 Windows of “Health Glass” Make Solder or Binding Posts? . 73 Reseating a Chair with Cane . 120 Hens Lay More ._. 60 B-Eliminator Condensers . 73 | Painting in Damp Weather . 122 Dyed Trees May Give Us Colored How to Use 32-Volt D.C.. . . 73 Y y Lumber. . 69 | Plugging in the Short-Wave Set . 73 Hints for the Mechanic New Devices on the Home Ships Doctor Owns Marvelous Shop . 92 . Motor Wheel Drives Boy’s Coaster 111 ri adhe zd ae ae ; = peg tS rT Tl a Barge Small 46 Twenty-One Tools from Files. . 114 New “Air- Pocket” el Turns "‘Yene Hand. see tente 58 Novel Sew Rack . . . . . 1% ee into ‘Waterless —, ‘pasate Scene Depicted Hints on Sharpening an Ax . . 126 ooker” . .. a el . 59 .; ee eee ee ea, | Mie Aide LinertoMake | Ideas for the Handy Man Lights Switch Off .. 76 | New Fire Boat Pumps 12,000 Gal- This Model Flies ty oS , a “Waterless Cooker” Prepares lons a Minute 60 | Novel Mount for Shi 86 Whole Meal ata Time. . . 76 | Two1,000-Foot Steamers Planned Tops, Crosstrees, an Blocks . . 86 Helps Fill the Baby’s Bottle . . 77 in England 63 | More Comfort at the Beach . . 100 Can Opener. Scissors Grinder, in Warship’s Lon Range Guns Fire Fishermen’s Knots ‘ . 102 Same Bracket 77 Tons of Steel . . . « « 69 | Home Worksho Chemistry . . 107 — Electric Ironer Has Table ey rints for fome Workshop ‘ by ttachment . 77 oot-Propelled Auto — Turn the Crank and You Have Unusual Facts and Ideas “Shake and Guess Game. .. 115 Potato Chips. . . . 77 | Tubes to Link City and Airport . 23 Wirardey i in Wire Puzzles. . 116 Apron Resists Grease ._ . 77 | Has Our Earth a Glass Heart? 31 | Old Photographic Films Make A Toasted Sandwich a Minute Vacuum Tube a Mile Long 48 Good Stencils... 118 from New Grill . 77 | Why Metals Grow Tired 50 | Homemade Gluepot er . 119 Hinged Bracket Saves Time in A Poor Shot Led to Tinless ‘Tin Pattern for Cutting Moccasins . 125 Hanging Clothes 77 g Cans 50 g Emergency Beading Tool. . . 125 In This Issuwe—Hundreds of Fascinating Articles Tell the Latest News of Laboratory Discoveries, Scientific Triumphs, and Amazing New Inventions

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SaaS | t POPULAR SCIENCE MONTHLY SEPTEMBER, 1929 = WHAT IS NEW THIS MONTH Table of Contents for September LEADING ARTICLES Beating the Evolution Laws . . By Orland Kay Armstrong How Arkansas and Tennessee teachers spread forbidden knowledge A Nine-Acre Nest for Dirigibles . . By Arthur A. Stuart Marvels of the most enormous hangar in n the world Cheaper Power from Quicksilver : By Grover C. Mueller hy a new “mercury boiler” may doom the steam engine Talking Robot Sells Flapjacks_ . . By Frederick Tisdale New wonders of vending machines that ‘speak to you Now—Television in Natural Colors . By Alden P. Armagnac Broadcasting a rose’s blush Submarine Safety Devices Proved _. Risking death to test the life-saving “lung” **80 Miles on a Gallon by 1939” . . By Henry Morton Robinson Charles F. Kettering, famous automobile engineer, talks of the future . By Alfred P. Reck Tracing Your Car’s Family Tree 7 An unus? al picture story of auto evolution Scorching in My Horseless Carriage. By Roger B. Whitman Interesting reminiscences of an old-time motorist “Old Salts” of Fresh Water Seas__. By Webb Waldron Strange adventures of daring Great Lakes skippers Learn to Fly with La Brent—Conclusion . A rookie pilot tells of his first solo flight Plans to Move Homes by Airship A noted architect’s conception of future. oe Alaska’s Flying Gold Hunters James M. Nelson How planes chart northern wilds and open a al of wealth Motorless Plane Climbs a Mile . By Edwin W. Teale New triumphs of glider pilots SPECIAL FEATURES By Herbert Paus . By Wallace Ames By Larry Brent By John E. Lodge Cover Design . Do You Know Your Bessene Worth? . Expert financial advice Make Your Building Dollars Pay Where sound construction yields big dividends Our Readers Say— Back of the Month’s a . Illuminating comment on the latest ir in science Our New Screen Grid Distance Getter . By Alfred P. Lane The last word in sensitive radio sets—how to build it How to Pep Up Your Battery Set __. Getting the most out of a nonelectric receiver By Collins P. Bliss By Karl Vooght . By John Carr How to Choose a Heating Plant. Roger B. Whitman An expert compares advantages of systems ie’ the ioe builder Only Half a Ship Model, but— ._ By E. Armitage McCann A distinctive ornament that /ou can build Sewing Cabinet Made by Machine How to make a graceful work stand Editorials . How to Tame a Rough- Riding Car ; Gus offers hints on shock absorbers *“Which Weld Shall I Use?”’. _. By James Ellis Old Bill, veter2= machinist, discusses three possibilities . By William W. Klenke . By Martin Bunn 22 23 25 30 32 34 41 42 47 52 55 12 14 70 73 74 78 82 94 Astronomy A Musician-Astronomer . , First Motion Picture of Sunrise onthe Moon. . Flames of Star ee 4,000 Miles a Minute . Automobiles “80 Miles on a Gallon by 1939” . Tracing Your Car’s Family Tree. Scorching in My Horseless Carriage es New “Dachshund” Auto Has Front-Wheel Drive ._. How to Tame a a Riding Car When You're Stuck in a Mudhole. Novel Gasket Repair . . . A Simple Homemade Jack Ball an Aid to Steering Penny Makes a Shim . Aviation A Nine-Acre Nest for Dirigibles . re Machine Hides Mili- Depot from Airplanes. Uses lane for Hunting and Fish- ing Trips . New Precision Tool Grinds Valves of Airplane Motors . 1,500-Mile Telephone Calls from the Air. What an Airplane Assembly Line Looks Like... England’s “Sky Taximan” Gets a ew Plane. ‘ A New 1,400-Mile Beacon Air-Rail Lines Open. New Cross-Countr Record Taming the “Flat Spin” Dirigible Line to Hawaii . From Maine to Spain $13,000,000 Plan for Air Defense. Millions of Miles Flown A $70,000,000 Air Merger. Huge a net to Clean ean Open Hudson Air Line Seven Rules for Safety. Amphibian Plane Has ee Landing heel . ; They’re Building Their Own Plane . Unusual Air Photo Shows Diffi- cult “Lap” Formation . The Navy Planes Attack . A “Flypaper” Landin Field . Device 4 vith. anes in Air Radio Beacons . Learn to Fly with Larry Brent Plans to Move Homes i Airship New Japanese Aircraft Carriers . Alaska’s Flying Gold Hunters Motorless Plane Climbs a Mile How Balloon Was Named. 54 65 nN 3) SSSSSX 47 55 Septem ber, 1929, Vol. 115, No. 3. Popular Science Baguthiy is 2 publishes month- United States its possessions. and C at 381 Fourth’ Avenue, New York, N. = py oe Po lence Publishi content: . Ine. ed nd-clas titers m4 ~ ah at ones Post Office at sent: this $2.50; foreign countries, $3. The anada, ust not be reprinted without permission. In pre- aaa stories ot new products of applied science, Popular Science gon York under the act of March 3, pe additional entry as second-class Mont 5. does = waserasme bah Le methods of the individuals or con- . EB -class matter at the Post Office Departinent, Canada. Printed in U. 8. Copyright, 1929, by the Popular stock-selli Science Publishing Co., Inc. Single copy, ADS cents. Yearly su scriptions to urer; R. C, cerns produci ~ kh. The use ger ar puneee emes os is never eeekeal Capen, Monthly articles for President and Treas- ilson, Vice President; A. L. Cole. Bolce President and Secretary.

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SepTEMBER, 1929 POPULAR SCIENCE MONTHLY = Adrift over the Sea in a eee Blimp . Amateur Aviator Builds Plane in His Parlor. Sieve Salvages Diamonds in Air Mail Wreck ... Hunt Whales by Plane . Little Giant of Aviation Exceptional People Sweden’s Blind Inventor . This Fisherman Has Something to Boast Of! . Heroine Who Risked Life Science Rewarded . Parachute Jumper Leaps 135 Feet from Bridge Builds Clock in ‘Old Chinese Armor . U. S. Officials Honor Plane Model Champions . Grain Elevator Has an ‘ Artist. “Professor of Police” Wins Degree at Seventeen. for en Health and Hygiene X-Rays Made Shock-Proof Sunshine by the Wholesale Stingless Substitute for Iodine Discovered . Declares Cowards Are III and Can Be Cured : New Oxygen Tent — Pneumonia Victims . Lives with Rubber Heart to Save 63 64 64 : 140 54 . 58 59 59 62 63 67 . 140 . 141 50 51 59 59 60 65 Laboratory Discoveries Now—Television in Natural Colors New Sources of Gasoline . Poisons Cause Plants to Sprout and Bloom , oe eee Nature omen e Porcupine Wears Rattles ts Tail. ‘ A Fish Small as an Ant. Ant Cowboy in Steady Job Takes a Census of Fleas. Finds Rats Are Guided aed Hear- ing, Not Reason. . 25 48 60 New Devices for the Home Pinched-Lip Pitcher Retains Ice. Vacuum Cleaner Now F a Clothes. Punches and Seals Holes in Milk Cans . Pots Control Burner Heat Indi- vidually on New Gas Range Takes Up Clothesline Slack Plate Makes a Double Boiler of Two Pots . ‘ A Safety-First Cheese Grater Combination Egg Beater Pouring Pitcher ._. New Device Aids Floor Scrubbing. Bakes More Biscuits P Bread Slicer Cuts Every Piece Alike . . . Stepladder Has Safety Platform . Sink haste and ed Tray in and Not Kitchen T able ‘Has Seat, Racks, and Waste Pail . Iceless Cooler Fits in Window New Processes and Inventions Invents Pocket Device to Pre- dict Earthquakes 76 76 76 76 76 . 16 76 oe 77 77 77 77 77 77 77 58 4 r j. Mechanical “Eye” Gives Slow- Motion Vision ; 60 Hot Water by Siphon . . 62 Torch Gun Sprays “Paint” of Molten Metal _ - « 2 Keeps Trousers Creased_. 64 This Little Reading Lamp Clamps to Your Book Novel Pencil Sharpener | ‘Guards the Points. 69 Photography Balloon Signals “Quiet” Over Talkie Studio 61 New Movie Camera Records Scenes in Perspective. 66 Invents Movie Film Made of Canvas or Paper. 68 Automatic Photographer Lets You Pose Yourself. . 69 Three Poses on One Film. . 104 Crystals of the Movies. . 155 Radio Hotel’s Steel Girders seated Radio to Rooms . . 57 Photo Letters Sent in a Minute by Radio. . 62 Our New Screen Grid Distance Getter. 70 How to Make Your Drills Behave. 72 Keep the Battery Clean 72 Test Each Part First 72 ABC’sof Radio ... 72 How to Pep Up Your Battery Set. 73 Ships Submarine Safety Devices Proved 30 “Old Salts” of Fresh Water Seas . 42 Two Huge Diesels Drive New Motorship 58 German Warship Salvaged from Scapa Flow . 59 Largest Motor Lifeboat Carries 300 Persons 68 Huge Dry Dock Sections Go on Ocean Voyage. 69 Voyagers Send Greetings by I Pho- _ nograph Records. . . 69 Phone Som Ships at Sea. . 131 Unusual Facts and Ideas Beating the Evolution Laws. 17 Cheaper Power from Quicksilver. 22 Talking Robot Sells Flapjacks 23 Riding Rainbow Trains é 49 The World Map Corrected 50 After Two Million Years . 51 Tide Carries the Mail... 58 Orchard Pests Trapped by Lure of Geranium 59 Deep-Breathing Exercises Prac- ticed by Ancients. 60 Giant Crane Moves even on End- less Tread. 61 New Mechanical Man Obeys Beams of Light . 61 Oil Well Still Produces after Sixty Years . 61 Dead Sea Contains Gold Worth Fifty Billions 63 Bottle Drifts 8,300 Miles across the Pacific. 64 Names, Like Hats, Change Style. 64 Tusks of 4,000 Elephants Supply Billiard Balls : 65 “Hold It, Please!” The Sea Lion Strikes a Pose . 65 One Half of All the Rain Goes Back to the Air. . 65 ® Greatest River Chain Is Revealed by Explorers. . Aluminum Replaces Wood in Office hairs. Strange Mineral Produces Useful “O spring” Edison’s First Lamp i is Pictured on Stamp . Walls Insulated with Lining of Seaweed . Find Lost Village Buried bys Sand 400 Years Ago Burned by Glacier Tee . Round-Up of Wild Horses a Thriv- ing Industry . Handwritin ” thems Sex by Slants er Curves Oaks Popular . Alaska’s P Million Reindeer Form Great Industry ‘ Onions Their Own Doctors ‘ Smelter Raises Crops to Test Effects of Fumes ‘ Stamps Raise Museum Fund. . Science Preserving Rare Vatican Manuscripts . Telephone Talk Is Tested by Queer Sentences. How Much Deo You Know about Plumbing? _. oo" How to Light Your Garden How to Repair Your Lawn Mower. Hinges Support a Swing. Clamping Fruit Jars. *“ Which Weld Shall I Use?”’. Simplified Angular Set- -Ups. Starting an Accurate Hole on the Drill Press Check the Crib Attendant. Getting the Most Service from Drilling Cutters. . ; Use the Side Heads for Side Cuts . Chalk Keeps Drills from Working "eee ee ae Bolts with Casehardened Threads Last Longest. . ~» & New Bushings vs. Oil . Only Half a Ship Model but— . Sewing Cabinet Made by Ma- chine . ; Building a Lockheed Model . Reproducing a Rare Old Clock Hammering Bowls . . : “Let’s Play Grocery Store” Ways to Catch More Fish . Cards That Rise by Magic . Neat Metal Tags Made from To- bacco Cans Telescoping Water Cans for Auto Campers . ; All About Bottle Sto pers Blueprints for Your Home Work- shop Viking Ship Serves as Wall Light. Awning Teeme stains Vines over Windows. . Child’s Towel Rack Su ported by Two Elephant aa Driving Glazier’s Points . What You Can Make of Plywood Cases . . Casein Glue Fastens Yacht Model Sails Homemade Curve Ruler When You Hammer the Screw- driver , Hems of + FSR SE 131 For the Home Owner 48 99 112 . See - 123 Hints for the Mechanic 94 96 . . 110 . 110 110 110 110 . 110 Ideas for the Handy Man 78 80 81 86 92 98 . 100 . 102 104 . 113 114 115 116 117 118 118 119 . 120 . 122 . 123

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POPULAR SCIENCE MONTHLY OctTogeEr, 1929 WHAT IS NEW THIS MONTH Table of Contents for October LEADING ARTICLES T Automobiles Barnstorming with Lindbergh . By Randy Enslow 19 Auto Cigar Lighter Held . “Slim’s” former flying pal recalls their adventures ‘aan os ee eee ey ee 62 Where the World’s Fastest Ocean Liner Gets Its Speed 22 “Tight-Ro es”? on Power Line | 63 Wonders of the Bremen, new Atlantic speed queen — Ru -” - ale Make Tires Aims Rocket at Roof of Sky . By Alden P. Armagnac 24 uncture-rroor . 64 Exploring the upper air with a projectile ‘of science N . Pavement Made 70 The Zeppelin Grows Up . By Walter E. Burton 26 a The romantic story be the modern airship and its creator "a Garage Parks Autos 70 Plant “Pills”? Grow Bumper Crops . By H. H. Dunn 29 Knocks That Tell of Motor Ills 84 A discovery that may revolutionize agriculture Eye-Saver for Auto Repair 88 The Bulldog of the Insect World . By E. Bade 31 Emergency Flange Repair. 88 Strange facts about the digger wasp, the farmer’s ally An Inner Tube Saves Shoes 88 Fifty Years of Flameless Light . 32 Spark Plug Hole Cieaner . 88 Why the world celebrates the birthday of electric ‘lamps mg Door Check 88 Thomas A. Edison—His Life Story Told in Pictures . 33 Roll, R ow th ‘Tr = f een om Siete 88 A photographic biography of America’s electrical wizard Garage 6 8 ’ 127 Feeding 13,000,000 Radio Sets By Frank Parker Stockbridge 41 a ‘The head of a great broadcasting system tells how he delivers whole- — sale entertainment Aviation Everyday Wonders in Colloid Chemistry By E. E. Free 42 Barnstorming with Lindbergh 19 Che fascinating story of a new-old science The Zeppelin Grows U %6 The Mightiest Airplane That Ever Flew . 45 The Mi htiest falas That Details of the new 100-passenger Dornier flying yacht Ever Flew . 45 First Scientific Census Will Put America under ~ Migr PR .* => arachute Jumpers Take the ™ by . Rec. a Tackling the job of counting 120,000,000 noses The First Classroom Dirigible 52 Largest Aviation Beacon? 52 New Gale Machine Tests Planes ; 56 a aring tek « Ct How wind tunnels save lives and money Tiriei 52 New Scientific Refrigeration . By Robert E. Martin 57 “Air easier and Its ‘Big How fish are kept fresh 1,500 miles from the sea Brother 52 Shattering the World’s Duration Mark. . + « » ae SPECIAL FEATURES Anchorage for Seadrome 53 Cover Design . By Herbert Paus To Berlin in Six Hours? 53 Rise of the Investment Trust ; . By Wallace Ames 4 3 an Fwy wall : 53 The financial editor’s monthly advice Sharpshooting with 4 — ° Only High-Grade Tubes Survive a By F.G. Pryor 12 Mew Twent veneer Sinas 53 Why inferior vacuum tubes fail in modern receivers Poses Tested by Monkeys . 54 Our Readers Say— . 14 Aerial Photos by Night ; 54 Women Aces Recognized . 54 Editorials . . : s Two New Glider Records . . 54 Back of the Month’s News , By Karl Vi coght 46 Telescoping Corridor for Air Interesting comment on the latest in science a a 54 Power Detectors—How They Work ; Alfred P. Lane 72 Women Ticeee Who Have Made An understandable explanation of an important radio development Their Mark : : 55 Guarding the Set from Blow-Outs . By John Carr 73 Monoplane Bremen ‘Goes to Trouble-proofing hints for the radio fan New York Museum. . 62 A New Slant on House Painting ; By Roger B. Whitman 76 Fi “Ai — Build an Unusual 69 How to pretect outside woodwork against the years irplan Glimpses of Unusual Men + « «§ « 2B Intimate sketches of people i in the public eye En gineerin g Linoleum Carving—A New Craft. . By Douglas Leechman 81 How to cut designs for decorating furniture — Fs Forty Years—the - Knocks That Tell of Motor Ills . . By Martin Bunn 84 "World's Highes Gus and Joe ne a sick motor al TH386 Fect - —_ Dam ee: 60 Building a pote end table ; age Lines . 61 How to Hold Angular Shop Work By Henry Simon 94 Pipe Lines Carry Coffee down Tips from an expert machinist 4 ene: Hills - 67 United States, its possessions, and Canada, $2.50; foreign countries, $3. The Gotobes: 1929, Vol. 115, No. 4. Popular Sqjence Mont aly sD published month- * 381 Fourth Avenue, New York, N. Y., by the ne FOP. lence Publishing contents of this magazine must not be reprinted without permission. In pre- , Inc. Entered as second-class matter 8, at the Post Office at senting numerous stories of new products of a Canny science, Popular Science New York under the act of March 3, 1879; * dditional entry as second-class —— iy does not underwrite the business methods of the individuals or con- matter at. S Canes. Illinois. Eatored as second-class matter at the Post Office prod them. The use of Popular Science Monthly articles for Departm Printed in U. 8. A. Copyright, 1929, by the Popular stock-sellt emes is never authori O. B. Capen, President and Treas- Science Publishing my Single copy, 25 cents. Yearly subscriptions to urer; R. C. Alison, Vice-President; A. L. Cole, Vice-President and Secretary. a

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OcroBER, 1929 POPULAR SCIENCE MONTHLY 3 [-— © ®@ Laundry Drier Has Removable @ All Skins Contain Similar Colors, Excep tional Peop le Unit for Warming Bathroom . 79 Tests Reveal. . 66 Young Astronomers Run High “Indirect” Electric Fan Averts Engineers Like Blondes; Farmers School Observatory ._ . 59 Colds. . 79 ike Chickens. 66 Diving Reporter Phones from Portable Ironing Board for Travel 79 | The Stone-Age Girls Used Lip- River Bottom . 66 Cuts Beans into Short Lengths . 79 sticks and Mirrors 66 ba — the Channel on Water 67 Crack Train Cuts Time Across the ha BnpleserMechens. |. | 99 | New Processssand § | , iii. ° |. : a A Patron of Science. . 148 Inventions Dr Arr i in Homes Causes Rugs to He Breeds Quail in Captivity . . 80 : cor Out 68 New Soviet Machine Gun Fires Rel P Tn, Ghat os Geel 62 elief, Not Sorrow, Real Cause of Health and Hy gene Traffic Light Warning to Safe- a Weeping “ay Taw pe aed 68 Preventive Science Cuts Typhoid guard Pedestrians. 62 by Millions PP P 71 Death Rate . Three-Color Flashlamp Serves as y This Poultry Farm Has 300,000 Find Open Windows Are Best Signal . 63 L H 71 Ventilators . 62 ~— Made F Fireproof b by New ‘ aying Hens . Eggs, Beans, and Milk Cause ecret Chemical . . 4 trange Ailment ._. 66 | Rte Res Meling & Fire- a For the Home Owner oof Wa - oilesnies Cancer 65 | Self-Centering Nail Set New Aid Hints on amie Kitchen “Dry Ice” Offers a ‘New Remedy to Carpenters. 65 Pcs. O07 "Tas Made of 92 for Leprosy. 67 Spri ollers Replace Window ‘a tility amper ade o 1 Anger and Fear Born of Child- Sash Cord. 68 1 ey 19 hood Diseases? . 67 Automatic Detector Gives Warn- Wood for Outside Woodwork Re- 121 Need M av ing of Gas Leaks __. 68 pairs. me S i Health uunshin ine Than 69 Substitutes for Store Clerk’s Protecting Floor Mats from Mold 127 Suestiin tn Meat Lanes 69 Handwritin . 69 | Pulling Electric Plugs . 129 More Women Flat Fe ooted; Jobs Mechanical urse Holds the New Horn Improves Old ‘Phono- Are Blamed .. 70 Baby’s Bottle . . . . . 69 graph . - . 137 -~ Comfort a Guide to ema lying Spring Hinges , eo He tut Cake Teens a ..s a P hotog r aphy Testing Defective Electric Cords . 141 intel A Com or — . = ss ‘ Aeria otos ight . 4 4 4 Laboratory Discoveries | Camera — s Unusual Light- oe Hints for the Mechanic ning Display . Drill Extension Has Unusual —_— Oe shee oy bel 48 Talkie ys | ietaione on Skele- Strength . . ee oe al ae me 68 | Old Bill Says. en ; ovie Camera Detects False Making Holes in Spring Stock. . 100 yy erg ‘May Be Caused by 65 Alarm Jokers . . . . .-. 71 | Two Pi es Aid in Bing. ing Heavy Aluminum Coat Prolongs ‘Life of ‘ S a Cu h Or. 138 Duralumin _. 69 Radio mdi we te eel Cut wit . 138 in ‘ ‘ “— zn Rays Futile fo for Sp ceding 71 Feeding 13, _ . Radio Sets . 41 A Non- Easitiieg Acid Brush. . 145 . Radio May Set Watches ._. 64 Power Detectors—How They Work 72 Models Special Pliers Simplify Wiring. . 74 Ideas f or the Handy Man easuring Sensitiveness . . . 74 ome with a Magic Ink Bot- Casting Model Yacht Keels . 108 Testing izh Voltages rt « - 74 ” - 86 Hints on Model Airplanes . . . 119 | A BC's of Radio 14 | ‘Tools from Old Hack Saws 98 Building the Wing for a Lockheed Guarding the Set from Blow-outs. 75 Electrifying Old Kerosene Lamps. 102 Plane . 123 Dentist’s Mirror Locates Broken Decorating with Kalsomine 104 es Bombs from a Model Radio Connections. 146 | Embroidery Hoop Improves Sand- lane . 129 paper Disk _ ‘ 106 Simple ode od _ Make Small Ship 131 Unusual Facts and Ideas | Blueprints for Your Home Work- ae Fifty Years of Flameless Light . 32 Polishing Tarnished Metal. . 114 Nature Everyday Wonders in Colloid — af Edges ._ . 116 Chemistry 42 | Good Tools Important. . 119 An Arctic Walrus Hunt . . . 47 | Largest American-Built Merchant Comical Ash Trays 4 for ‘Bridge Counts 8,239 in Ant Hill . 61 essel . - » 46 Fans . 120 Plant and Bird Species Outlived } ome Recorded by Light . + 46 | Using Steel Stam ae, é . 120 Monsters . 63 uarding Buildings from ae - 46 | Mounting a Small Shop Motor . 121 Tiny One-Cell “Creature Wears ay for Chemicals — . 47 | Extra Drawer Fitted into Side- Life Preserver_ . 69 —— by Lamplight . . . . 47 board . 122 Grasshoppers Have Valves for hine” in Yeast . 48 | These Book Ends Will Not Slip . 128 Breat 71 First Scientific Census Will Put Loosening Tight Unions . 129 America — ~ aenaaee 50 | Fi a Grip Improves Paint-Pot an New Devices “_ theHome | Outboards Drive Racing Sloop through Canal _ . 60 | How I Motorized My Home Work- Takes Up Slack in Electric Cords 78 | Largest Sundial Isa Lamp-Post at shop" . . . 132 A “Grease-Gun” Shoe Shiner . 78 Night 61 | Simple Tension Regulator. . 133 Opens Balky Jars ._. 78 tentin Train Drops Off Cars at How to Turn a Pair of Candle- Rubber Bumpers on Push Broom Way Stations. . 61 sticks from Steel. 134 Save Furniture . 78 Alaska Hunts Destructive Wolves 62 Sharpening the Wheel of a Glass Handy Bean Stringer ‘Clamps to Erased Writing Revealed by Ultra- Cutter. 136 Table . » + Violet Rays . - 63 | Making Sharp-Edged Tools Keen- Novel Tongs Do Odd Jobs . . 78 Woman Sets Office Clocks by Cutting , 136 Clothespins of Metal . . 78 100-Year-Old Watch. . 63 | How to Make Small Pulleys .. > ~— Eggs i in Two Kinds of Slices 78 American Hens Go In for Quan- Making a Countershaft for a Mo- A “Safe” for Milk Bottles . . 79 tity Production .. 64 torized Workshop. . 144 Reversible Faucet Serves as ’ Sculptured Panels Beautify Fire Old Style Letterpress Clamps P Drinking Fountain . . 79 Escapes 65 Veneered and Glued Pieces. . 145 Electric Room Heater and Stove Hands and Feet Missing in Useful Miniature T-Square . . 146 Combined. . 79 § Brazilign Family . . 65 $ Oilcloth Tray for Small Articles . 146

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POPULAR SCIENCE MONTHLY NoveMBER, 1929 WHAT IS NEW THIS MONTH Table of Contents for November ly at 381 fourth Avenue, New Yo Co. ins. En inc. Entered as second-class matter ‘bee, 28, New York under the act of March 3. 1879: ° ntional "entry as as second-class Mor matter at Chicago, Illinois. Entered as seen eees matter at the Post Office Department, Canada. Printed in U. S. Copyright, 1929, by the Popular stock-selli Science Publishing Co., Inc. Single copy, A5s cents. Yearly subscriptions to urer; R. C. cerns produci them. The use of Po LEADING ARTICLES tT Astronomy Rays—The Clue to Evolution , By E. E. Free 19 A revolutionary theory explaining the cause of life’s progress Finds Mars Has Springlike Cli- A New Invention to Harness the Sun __. . By R. H. Goddard 22 mate 65 An eminent physicist explains his novel solar engine “ity Space”’ a Cloud of Dust .By Thomas Elway 25 hat astronomers have learned of flying atoms between the stars Automobiles You Don’t Have to Bea Pilot. . By Sherman M. Fairchild 26 A famous plane builder tells of opportunities tor nonflyers Science Takes Stock of Human Machines : 28 Making Tires Live Longer 54 High spots of the recent world physiological congress Gas bp —y ~ vane s Auto- Streamlining for Speed By Alden P. Armagnac 30 monue and rue 60 A new engineering science learned from the fishes P —— Detect Overweight » Tying Europe to America by Telephone Wires _. 32 : a : By Frank Parker Stockbridge Mote Track ne Tal - An interview with Dr. Frank Jewett, chief of the Bell Laboratories Army Tank . 70 Who “Planted” the Glozel Fakes? By Michel Mok 44 Getting a Car Out of a Mudhole 86 Exposure of a hoax that puzzled science Oiling New Piston Rings . 6 Poison Gas for War on Rats ; By George Lee Dowd, Jr. 46 A Choke Indicator ies 86 New phases of the age-old battle against animal pests Mending a Water Jacket . 86 Science Builds Fortress Vaults to Outwit Safe Crackers . ; 47 Repairing Seat Cushions . 86 By Henry Morton Robinson Matching wits with yeggmen who pierce the mightiest strongboxes Next—Sixteen-Cylinder Autos By E. H. Hamilton, B.S., M.E. 50 “oe Present trends in motor car design discussed by an expert Aviation Three Men to Hook One Fish . By Captain Tony Rosato 56 Adventures with the tuna fleet a thousand miles at sea The World’s Only Marble Dam . 58 ang gy —= Ways to Crash 34 A unique engineering feat near the battlefield of Marathon ane 58 romenade . 40 A Hornet’s Nest. 40 First All-Metal Blimp . 40 SPECIAL FEATURES An Automatic Pilot. 40 Cover Design . By Herbert Paus ockets to “Boost” Heavy Planes 41 Twelve Million Investors Who Don’t Watch the — a . 4 “Fly on woe > Office = ry lace Ames Timely advice from the Financial Editor Turbine Motors Next? 41 Refueling across U. S. 41 Oil Heat Scraps the Coal Shovel __.. By Collins P. Bliss 12 Inventions for Airships Al How new furnace equipment saves back- breaking toil Helium Prices Dro 4l rs Sa 14 Glider Towed 160 Miles Al Our Readers Say Edi 1 16 Dummy Tests Parachutes. 42 itorials A 10,000-Foot Tumble. 42 Around the Werld b al. ‘ 24 Worse Than Falling 42 A picture story of the Zeppe peeing airship voyage Discards Wings at Sea 42 Back of the Month’s News . ; By Karl Vooght 52 Passenger Transfers from Dirigible " A digest of the newest advances in science 3, Fh oa” = Audio Amplifiers Near the Ideal . .. « By Alfred P. Lane ,71 A High Flyer’s Biclenct 42 New perfection for the “strong man” of radio States Agree on Air Laws. 42 How Static Limits Radio Reception. . By John Carr 73 Latest Autogiro Lands without A graphic explanation of the difficulties of “getting distance” - Rolling or . 2 ° Making the Floor Suit the Room ._._. By Roger B. Whitman 76 normous New Flying oat . F Housebuilding hints for the new dwelling — oo Hangar Is Ameri- 43 Fishing Schooner Model—Bluenose By E. Armitage McCann 79 New Compressed-Air Catapult 43 How to make a replica of a world trophy winner Blimp akes Ship Passenger Dangers in Driving with Bad Eyes... . By Martin Bunn 82 ore. . 43 Gus and Joe discuss “tunnel vision” and other motoring perils a * Aviator Will Test Camera’s 61 Mastering the Use of a Circular Saw . By William W. Klenke 88 Holds Plane’ Bostenfess in Ade for Directions for a practical exercise in groove cutting and joint making Ses. . war Hows and Whys of Hardening Steel . . By Henry Simon 94 Shortest Air Mail Line. ; 64 The inside facts about heat treating of tools & Made 500 Parachute Jumps . 65 Berea 00, Vous MoS Fogetar Sctnara getty manucentemenit; United Sates te pemeics,t Cane, 22 cere comnts Sf Te , at the Post Office at seating numerous stories of new products of applied science, Leo Science ly does not underwrite the business methods of the individuals or con- _ i. Monthly articles for schemes is never authori ———. President and Treas- Ison, Vice-President; A. L. ‘cole, Brice resident and Secretary.

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NovEMBER, 1929 POPULAR SCIENCE MONTHLY = Annapolis Middies Learn to Sail the Sky, Too. Waxed Planes Go Faster, Experi ments Indicate Engineering Laying the New Baltic om Never Too ~— Move . Speeding the Hudson Bridge . ‘ Building Boulder Dam. . Dam Begun in Swiss Alps to be Europe’s Highest Pick Site for Gibraltar Tunnel to Africa . es Exceptional People Travels Million Miles to and from His Office ‘ ~~ Seaside Home to Resemble ip Cues 200— Merry-Go- Round — Horses a Year. “Paints” Picture with Scraps of Leather . Builds “Rug” Table Top of 538 Bits of Wood Former Champion " Auto Racer Now Garage Man . Builds a Clock Inside Small- Necked Flask. . 2 a eee Health and "ygiene Machine Records Pulse , Alcohol Injection Tested as New Anesthetic. Nine out of Ten Get the Measles, Report Shows . % Nature oon Beaks for Queer Birds . iscovers Some Flies Are Allies of Man . Evergreen Treetops Bend Toward Sun and Wind . Spider Victor in Strange War with Snails . : Curious “Camel” Plants ; Hand Driven Ice Cream Freezer . Fork Ejects Its Own Load ; Vacuum Cleaner Disinfects Room Perforated Cover for Boiling Pot Saves Hands . Kitchenette and Icebox Combined in Compact Unit. Knife Cuts Grapefruit without Crushing . Broiling Pan Slides Out When Stove Door Opens . New Sponge Chosen Lamp Shades. Stamps Out Fancy - en Cookies. Handy Knife Set for Wall... Novel Dustpan with Foot Pedal Hugs Floor Electric Servant ‘Does Varied ' Tasks . Built-In ne Receptacle Catches Sweepin Bake Pot — Two Foods at Onc Flue Keeps Kitchen Walls from Blackening . : 67 62 65 66 67 69 55 67 38 59 69 70 70 New Devices for the Home 74 74 74 74 74 74 74 74 75 75 75 75 75 75 75 4 r Tiny Brush for Corners Fits on Broom. New Processes and Inventions Extra “Finger” Permits New Or- gan Effects . . —. Designs “Carpet ‘Sweep- ” for Streets. Talking Movies Carried to Audi- ence . Extension Scaffold Perch for Building Washers. New Rack Lowers Music for Child Pianists. Watch Wound ‘by Opening ‘and Closing Case . Screws Driven Speedily with One- Hand Tool Hose Reel Container Also Coal Chute Door . i: - 2 Radio Judging a Loudspeaker’s Voice Balancing B Battery Load Test the C Batter A. C. Tubes Act Sta lowly A B C’s of Radio Ships Motor Boat Beats Old Robert E. Record . Ship Plying to Africa to Have efrigerated Air . Powdered Coal for Ships Proves Worth in Test Radio and Machinery Boost. Modern Whaler’s Catch Stock Prices Posted on Liners in Mid-Ocean = 75 61 61 63 63 64 64 65 63 64 65 67 69 Unusual Facts and Ideas The Last Word in Toys Life Growing Shorter . Minerals as Peace-Makers Thumping Atoms . How Much Do You Know about the Movies? . ‘ A Lost Race of Builders Magnetic Pole Wabbles : Mad Emperor’s Galley ae after 2, Years. . Field Gun’s Recoil Out-Pulls a Ten-Ton Tractor. . Railway Cars Washed by Electric Scrubbers New Giant Strawberries Run Six to the Pound Reindeer Raising a New Canadian Industry . Giant Board Shows U. S. Fleet’s Movements . ‘ Mount McKinley’s s “Smoke” is Wind-Blown Snow , Silkworms Vaccinated against Dis- ease Cows Fed Legume Hay ‘Give More Milk U.. 3. Has Vast Lands Still Un- inhabited ._. — base less Hens to Increase Boil ~ Ree Thrive in ‘New Alaskan 4 Power Plant’s “Waste Heat Used for a Garden 5 Wheel Runs for 115 Years 62 62 62 63 64 64 65 67 67 4 r i. Measures Energy Used in Piano Playi 68 Dr Cleened Clothes Hold Color, ests Show . 68 Matches and Cigarettes Made “Fireproof” . 69 Reflected Daubs of Paint Form Miniature Portrait . 70 Telephone to Firemen | Atop 90- Foot Ladder. . 70 For the Home Owner How to Fit Up a Boy’s Room _ . 104 How to Fix a Galvanized Iron Pipe Temporarily . 116 Repairing Defective Electric Cords 128 How to Fit a ees Latch Ex- pertly . 136 Hints for the Mechanic Hows and Whys of seer Steel . 9 Surface Plate Not Anvil 96 Saving Time Filing. 96 Filing Curved Work . 96 Radial Drill Press Grinds Bulky Work Accurately. Chuck for Machining Commuta- tor Rings . 138 Punch and Die Set for Bell- mouthing Tubing ; . 140 A Wrench for Lock Nuts . . 140 Ideas for the Handy Man Fishing Schooner a nose 79 Craft Work with Newspapers. . 84 es the Use of a Circular . 88 Makin a Bench Drill from a Bottle Capper 90 Hammering a Disk into a Vase . 98 A New Way to Emboss Leather . 102 A Combination Shoe Box and Rack . . « 108 Storage for Garden Produce . . 110 How to Make a Drop Leaf Table 112 Turning a “Congo Cup’ 113 Blueprints for Your Home Work- shop . 114 A Sturd ‘Chair for Little Ones . 115 Boring True Sockets in Turned Work . . Be Indexing Tailstock Spindle 117 How to Perform Five Simple Tricks of Pocket Magic . . 118 Lathe Sanding Drum Split to Make Clamping Easier . 120 Will it Be eon or Clipper Model This Year? : 121 Builds Modernistic Cupboard Cheaply . . . 122 Coffee Table Made from Old Taboret . 123 Desk Drawer Hides Lam 123 A Spring Tool for ows 2 Cutting 124 Footstool from Tin Cans . . . 125 Hints for Ship Model Makers. 125 Protecting Tools from Dampness 125 Wood-Carving Tools Made from Hack Saw Blades. 126 String Aids in Painting Chair Rungs Neatly. 127 Water Tube "Mester Improves Furnace . 131 Proper Undercoats Insure Success in Painti s+ ae Testing Paper Towels. . 135 Catching Sawdust from a 2 Small CireularSaw. . . . 137

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POPULAR SCIENCE MONTHLY DECEMBER, 1929 Table of Contents for December LEADING ARTICLES r Automobiles A New World Run by Dynamo . By Grover C. Mueller 19 Dashboard Spray Puts Out Cigar- Why electric power is causing a second industrial lcapeiation 5 =o. ‘ 60 First Victories in the War on Fog _.. By Edwin W. Teale 22 ix-Wheel Army Truck Speeds - How science is beating avietion' 3 chief enemy Used Auto Oil Reclaimed i in Gass 66 Oil Wells Drilled in the Ocean ... By George Lee Dowd, Jr. 24 one Teste ee Cinmg: Seer Marvels of undersea petroleum fields miramece . . 65 How to Fix a Balky Garage Door 84 High Speed Skyways 14 Miles Up . . . By Alden P. Armagnac 26 Simple Holder for Valve Pin . . 84 Why engineers seek to navigate the * ‘aiatnaglanen,” the top of the air Handy 9 Lubricator . 84 Windshield Gap Closer 84 Why Minds Behave As They Do . 28 Ten Dollars for an Idea 84 Fascinating revelations from the recent International Psychological Congress Aviati viation Welding—The Silent Builder : P By Robert E. Martin 30 Latest triumphs of the noiseless way to erect skyscrapers New 30-Passenger Plane . 40 Keeps Lit Parachute Flare F loating Can Science End Forest Fire Peril? _. By Alfred P. Reck 32 for Hour . 40 Menace increases despite work of Forest Service, officials report Test Hazard of Cigarettes Dropped from Plane. 40 The Moon Is Made of Cinders . By Thomas Elway 44 Planes Fly Tied oe 40 New knowledge about our neighbor satellite Queer Tandem Machines Fly « 4l A New Parachute ._. 4] **How I Fly My Plane”’ . By Randy Enslow 46 A veteran aviator tells the inside facts about piloting pel henge ty a = Diamonds—Tiny Skyscrapers Built of Atoms . .By E. E. Free 49 Novel Equipment on New Plane Searching with microscope and X-ray to find how crystals grow Models ‘ 41 Measuring Flowing Qualities of A Box of Sounds for the Movies . 51 Liquids for Plane Instruments . 41 How a modern pipe organ produces its effects A Shield from Lightning 42 . Ice Anchor for Dirigibles . 42 Fossil Monsters I Have Hunted . By Charles H. Sternberg 56 First "Aerial ate ‘a 42 An expert tells how he bags dinosaurs Air Taxi—20 Cents a Mile 42 Mail Pick-Up in Service 42 SPECIAL FEATURES Making Big a . 42 . _ By Herbert P New Ground School for Women . 42 ‘ettemieeaess — ~— Bleriot’s Plane Placed in Museum. 42 “Gimme a Tip” .By Wallace Ames 4 Passenger Transfers from Dirigible Adventures in the investment world to Plane . ; >= « Drops Mail by Parachute . 43 Looking for the Best? ._ By F.G. Pryor 12 Amphibian Has Wheels That Fold 43 Tips from the Popular Science Institute of Standards Largest Land Plane Enters Pas- ie Meni Son — 14 senger Service. 43 Pee Say ey Tee: Detachable Parachute Basket in Back of the Month’s News . By Karl Vooght 52 Fuselage . 43 Timely comment interpreting ‘the latest in science Build 3 F oot Model to Test Ocean Landing [Field _. 66 Editorials ia « « » oo a Airplane and Dirigible Combined in Model . 66 What the New Radio Sets Offer By Alfred P. Lane 70 Palatial Hangar Has Novel Fold- How to decide what receiver to buy ing Doors 69 A Well-Built House Is Cheapest . . . . By Roger B. Whitman 74 How to save money by spending it at the outset Engineering Where the New Motor Cars Excel . . By Martin Bunn 76 The Newest Arch Dam ....__ 53 Gus and Joe discuss the latest models Suction Pipe “Stevedores” Un- load Copra Cargoes . 59 Operating a Model Railway System . By Frederick Ryder, Jr. 77 Train diepatching with miniature locomotives and cars — Pierces Can- 62 Christmas Cards by Photogra aahe r . . By John Steinke 80 —— to Have Greatest Arch - holid ti ridge . « & A novel way to send personal holiday greetings Test Steel-Paved Streets | | | 67 Hints on Heat Treating Steel . . By Henry Simon 90 Volcano’s Steam Will Heat Hotel Expert advice on hardening tool metal — 4 in Hawaii SS) ie ae Decrapry iat, 2.2b Na Roeser trea nenty mashetcent: Date Paes, pnenton,2 Conn, 2.0; erat. Te ., Inc. Entered as second-class matter Dee at the Post Office a’ senting numerous stories of new products of applied science, Popular Science New York under the act of March 3, 1879; additional’ entry as second-class Monthly does not underwrite the business methods of the individuals or con- matter =. wo Illinois. Entered as — nd-class matter at bea ag Office cerns producing them. The use of Po ow 2 ——— Monthly articles for Depart m Canada. Printed in U. 8. Copyright, 1929, by the Popular stock-selling schemes is never authoriz n, President and Treas- Science Publishing Co., Inc. Single copy, Aas cents. Yearly su soriptions to urer; R. C. Wilson, Vice-President; A. L. Cole, View resident and Secretary.

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DecemBeR, 1929 POPULAR SCIENCE MONTHLY

= Back to the Stone Age in a Modern Yacht. . Climbing to the World’: . Roof Tops " Science and Tragedy i in the Aretic African Rivers ~— Hold Fortune in Ivory American Party First to Scale Alpine Peak Calls East bation Sieoad an Earthly Paradise ; Exploration Health and Hygiene Nervous Cities ._. How Much Do You —_— chines Eyeglasses? Bandaging with Silver Mental Disorders Increase in Spring, Tests Show . Lightning’s Own Fingerprints. Studying the Apes... , New Evidence That Sunlight Is Electric Models Furnishing the Bluenose Deck. Sharp Knife Aids in Model Plane Building . , Toy Woodworking Maditese ; Model of Darmstadt —_ Sail Plane . New Colored Pencils Aid i in Ship Model Work . Nature Nature’s Seed-Sowing Machines . A Fish with Lungs . Huge “Elephant Ear” 47 Inches Long Rattlers’ Den Dynamited, ‘but Snakes Survive : Leaf Is Lifts Cap Off Milk Bottle Shaped Salad Molds for Bridge Luncheon Lifts Eggs Out < Water When They Are Done . New Electric Range Has No Legs Device Punctures Milk Can for Pouring . Tilting Stand Empties Washtubs Rubber Door Wedge Can’t Slip New Processes and Inventions New Hot Water Bag Saves the Skin from Burns... Penny-in-Slot Doorbell Keeps Hawkers Away . Service Set — to the Card. Table . rs 34 37 38 63 67 69 52 60 67 Laboratory Discoveries 33 55 65 86 102 . 104 111 132 36 54 61 62 New Devices for the Home 73 73 73 73 73 73 73 60 60 61 4 r

5 Round Playing Cards Are the Latest. 61 Cable-Laying Machine Bores un- der Street. 63 Revolving Camera Makes Planes Dothe Loop. . .. . . 68 Radio Power by Radio Possible?. . . 52 Radio May Trace many of Bird Migration : 60 One Radio Set Supplies 2. ,000 Headphones . . 67 To Aid in Choosing a New Radio Set. 71 A Handy Radio Trouble Lemp . 7 Screen Grid Suppressors . . . 72 Stopping Audio Howls. . . . 72 Limits of Selectivity . . . . 72 ABC’sofRadio . . .. . 72 Unusual Facts and Ideas Painting a World’s Fair with Light 25 New Cloud Atlas to _" Predict Weather .. é 52 Stars Too Hot to See : « »- = Universal Yardsticks . . . . 54 History in Tattoos. . . . . 54 “Medicine” for Steel . . . . 55 Locomotive, in Endurance Run, Sets Record . . 60 High Seat for Cuntemen Aids the hoe Salesman... 60 Motor Buses Replace Last of Vermont Trolleys . . . 61 Young Geologist Unearths ene of Ancient Whale ... . . 61 Puppet “Slaves” Found in Graves of E Egyptians. . 61 Outboard Motor Boat Sears shove the Waves... 62 Chemicals Injected into Tree Fireproof Lumber... . . 63 Intelligence No Guide to Mennsl Skill, Tests Show... 63 Testing the Strength of a Stage Whisper . . 64 Cathedral Windows Restored by “Shaving” . 64 Electroscope Finds ‘Lest Tube Radium... 64 Tribe Has Lenenege That Cannet Be Written... 64 Steamer Sights Suen in “Teens atlantic Flight ... . 65 Indoor Hopscotch Game Played with Marbles’. 65 Quake Relieves Desught —— 65 Old Auto Engine Runs Portable Hay Baler. . 65 Machine Teaches Denewe re “Splits” . . 66 Signs of Life at " Chileago 600 illion Years Ago .. 66 Seal Hunters Make Record Catch of 40,000 Skins... 67 Movie “Sets” Shifted be Over head Railway... 68 Plane Breaks Kite String ona Spoils a Record .. 68 New Theater Program Can Be Read in the Dark. )

} Guide for Drilling Glass agp Insect Hunting by Ocean oyagers. . . 68 Bark of a Rare Cinnamon Tree Worth $4,000. . . 68 Long-Burning Fires Hold ‘Endar- ance Records. . 69 Auto Balloon-Chasing a New French Sport . . 69 Old Church Wears Odd Coat of Scaffolding . . 69 Panama Canal Busy . .. . 69 Water Fleas and Heredity . . 147 Sunshine in Candy . 158 For the Home Owner Four Useful Everyday Knots. . 108 A Few Facts about Applying lue 114 Spotlights Brighten a “Christmas Tree . 118 Hints on Handling a Paint Brush illfully . —s Rope Handrail for Inclosed Stairs 134 Coconut Converted into Novel Table Lamp . . . 134 Hints for the Mechanic Annealing Large Size Castings . 92 Sawing to a Curved Line with Cut-Away Hack Saw . . . 92 Drill Deep Holes in the Lathe . 92 Grinding a Reamer... 92 Reversed File May Improve Per- formance of Machine... 92 Loosen Chuck Jaws in Finishing Thin Ring. . 92 Grooved Set Screw Makes Tap for Cleaning Holes. 92 Pocket Mirror a Handy Tool. . 92 Ideas for the Handy Man One Man Who Has Every Tool a Woodworker Needs ._. 82 Preparing and Painting Conmeee loors . eS How to Operate a Jig Sew . «i Play Screen for Children . . . 98 Embossed Leather Bill Fold . . 100 Semiautomatic Box Serves Ciga- rettesOne by One . . .. . 107 Support for Slender Work 109 Blueprints for the Home Work- shop 110 Easily Constructed Modernistic Desk . . 117 Space-Saving Shoe ak Polish Case . Embellished Copper Letter Open- ers. . 120 Building Parciouse into Cavell Doorways : . 122 Ivory in the Home Workshop . 125 Laundry Case with Removable Bag .. 126 Simplified Electric ‘Toaster Built at Low Cost . ‘ Small Clock Case for Holding « a Watch... 129 Caring for an Oilstone | . 132 . 136 119 128