\lll 



INDEX 1() \()LI MK 



SK 



Page 

 A Safety-Bicycle for the Timid Fat Man 572 



Huntmg Destructive Animals in National Forests 576 



A Warning to Fishermen 59O 



The Sidewalk Coaster Becomes an Automobile 592 



1 raining the 1-ootball Tackier (,4} 



Letting the Jumping Rope Record the jumps 546 



gtilt-bkates for Ice-Skating (,4j 



Scoring Target Practice by Telephone , , 682 



llniliig Automobile Speed Demons. 806 



A Bicycle Which Won', Let You Lose Your 



tlalance 015 



Trapshooting in the Navy ni 7 



Marathoning at Home on a Special Tread Mill ' 844 

 A Dozen Ways of Breaking Your Neck. 860 



Renovating the Old Golf Ball 894 



Johnny Blows Bubbles from His Toy Cigar 894 



loys Which Instruct as Well as Entertain 902^905 

 A tJufter to Stop Sprinters in Indoor Sports 932 



Building a Speedy Ice- Yacht 94I 



THINGS THAT MAKE FOR EFFICIENCY 



Lighting the Inside of an Oven 16 



A Measuring Machine More Sensitive Than a 



Human Being tf^ 



A Mechanical Whip .' .' .' .'.■■.■.'.■.■ [7 



Hearing Your Men at \X'ork .......'.] 3O 



Interchangeable Pressing and Steaming' Device for 



i ailors ^n 



Fighting Timber Fires A3 



T^?,'^',"^" ^?."' "' Chicago's Wheat-Pit'.' ''.'..'." 81 



A Wallpaper Remover | I9 



Modern Dog-Catchers Use Motor-Trucics j 76 



Extinguishing an Oil Fire with Carbon-Dioxide 



roam t yo 



The Motor-Cycle Street-Sweeper 200 



A Machine that Stitches Baseball Covers! '...'.'.'' 203 

 A Step-Ladder with An Ambition . 230 



Taking the Smoke Out of the Smokiest City 236 



I he Burglar-Proof Store- Window 238 



Safety Shaving with a Lamp Attachment 247 



A Handy Shoe Cabinet for the Whole Family 256 



Cover Lift for Cafeteria Platters 3|4 



WAR PROBLEMS IN AMERICA 



The Mine That Hears 3 



Six Battleships Co Into Reserve 53 



The Feminine Gender of Preparedness .......... 71 



Throwing a Line of Communications Across a River 1 79' 



Pneumatic Gun with a Dynamite Shell 192 



The Submarine Blockade Runner, 227 

 Putting the Rookie Through the Mill at Platts- 



-r, ''V/ , ;, , 268 269 



I he Motorcycle Machine-Gun 529 



The Night Eyes of the Coast Artillery, . . ....'... 586 



Our First Armored Car 588 



Introducing Our First Anti-Aircralt Gun 657 



Collecting Money for Belgians by a Sidewalk Chute 668 



I he I housand-Foot Battleship 670 



Defending America with Motor Torpedo Boats. '. 721 



Saving Men from Sunken Submarines ] 803 



WiKwagging with Hand Flags 807 



T'l?'"! J 0°'," °' '^"'omob'le Tires at the Front 810 



A ■''eld Refrigerator for the Camper or Soldier. 831 

 What Happens in the Stokehold of the Speeding 



Destroyer 839 



The Giant Destroyer of the Future '. '. . . . 897 



MISCELLANY 

 Government Guide-Posts Give Detailed Informa- 

 tion for Strangers 7 



How Sea Caves Arc Made 21 



A Lamb with Two Coots of Wool ...''.'.'..... 21 



A "Shoo-Fly" for a Candy Kitchen 28 



A Protecting Holder for an Opcn-Foced Watch 29 



Nations Bleed in Peoce as Well as in War 62 

 The Official City Fly-Catcher of Redland.; 



California 64 



PreporednesB Against Bank Burglara ....... J. . 74 



Experimenting with the Siphon 82 



New York Is the World's Luxury Market . 83 



Dipping Elk to Rid rhcin of Ticka 88 



Ostrich Sc|uab: A New Delicacy i . . 88 



Tile Ama/ing Beetle !.!***' 94 



1 nsect Carpenters ond Masons .'!,'!!! 95 



Air-Propeller Drives Birycjc !!]!]!!! 97 



Electric Plant Run by cin Arteaian Well '.'...'. 97 



Straw Rnincontn of Japan |0| 



Page 

 What? Only Three Kinds of Feet? in 



Mn<in..;> . C II I 'V 



Mosquitoes on Snow Banks 



\ Watch-Like Coin-Case 



Fish Hatched in Artesian Basin 



5°" '.?,^'''"'' Graduate from Carlisle. 



06 

 106 

 107 



08 



Prize Winners of Sam Loyd's Puzzles I|2 



We Paid Six Dollars for These Two Pictures " 161 

 How the Porto Ric.n Does a Pushing Business. . ! 173 

 Blending Twelve Grades of Oil Into One 174 

 A Perfect Megaphone Shaped Like a Ram's Horn 175 

 I he Cockroach Attract, Attention as a Trouble- 

 Maker .y. 



Origin of Gas Jets Traced tn Woman's Thimble ' .' 177 

 lUlow-Pipes of the Born^-o uand Dyaks I79 



Throwing a Line of Communications Across a River I 79 

 w/ j"?^'° P ''"^ Convalescent Soldier (83 



Wind Cave Excels Mammoth Cave ' |83 



^ 9'.7-?=» F-'f" *''}i^.l> Has a Lantern of Its Own 185 

 A Sailor s Nautical Wind- Wheel |85 



If We Had Eyes Like Microscopes . . |90 



Trapping English Sparrows for Food |94 



How a Snails Tongue Cleans the Aquarium .'.'..'.' 195 

 Machines 1 hat Smoke Cigars 196 



A Mud Mosaic in the W'ake of the Treacherou. 



Colorado iqy 



Rocks Composed of Diatom Earth Which Float 197 



t-ighting the Sand Peril ' |9g 



Device to Hold Covers on Sleeping Child in Crib ' ' 200 

 A Luminous Life-Belt for Rescue at Night 201 



Seeing Yourself as the Oil Well Sees You .... " 201 



Trapping Animals by "Caming" Them 203 



^" iP''' .Lamp Used by Rubber Gatherers in 



Brazilian Jungles 224 



Where Freckles Come from and Why They Stay! 224 



Piano and Phonograph Combined ] 225 



Surviving Horse-Car Lines in the United States 231 



Coal-Dust Mountains " Are Now Repositories of 



Wealth 235 



Why a Grasshopper Is Like a Telephone Lineman 241 

 Hitting the Trail with a Wheel-Barrow and 



Determination 



What Makes the Hair Suddenly Turn Gray? . 

 Signaling with a Mirror to Men in the Field 

 Whv You Can See Two Sides of a Thing at the 



Same Time 252 



What's the Good of a Hawk? ........[ 254 



Wolves of the Sea That Abound in Ci^ban'Wctera 255 



Convenient Check Protector 307 



A Machine that Cracks Oil-Bearing Nuts Without 



Crushing Them 326 



And It Looks so Small on the Map! ... 329 



Making the Scallops on Plate Glass 330 



Hungarian Nectar Still in Which Rhubarb Brxiidv 



Is Made ' 33} 



Shootiiig the Chutes to Safety in an Explosion ... 360 

 A Castle Built of Coal to Advertise the Resources 



of Tennessee 36'' 



Defying the Action of Fire 366 



A "Soap" Which Is Not Used for CJeansing' '.'."'. 370 

 Catering to the Feminine Patrons of the Bootblack 371 

 Increasing the Decorative Value of Portieres . 374 



Using the Waste Heat of a Kerosene Lamp 375 



The Sensitive Brazil Nut 380 



A Hand-Made Hand-Played Phonograph! !!!!!!! 381 



Your Meerschaum Pipe 382 



The Story of f-'ctroleum !!!!!!!!!! 385 



A Rapid Firing 1 .ife Saver !!!!!!!! 389 



A Level and Grade Finder on the Periscope 



Principle • 30O 



Plenty of Room for All Europe ... 431 



New American Porcelain Utensils a Result of the 



241 

 247 

 252 



Wa 



431 



Spontaneous Combustion !!!!!!!!!!! 435 



Tracing Magazine Cuts 436 



Steel Cutlery Which Will Not Rust!!!!!!!!!!"! 485 



And 1 his in a Mechanical Agel 503 



A Famous Outdoor Organ ! ! ' ' ' ' 510 



The Money Value of Iwo Great Discoverieii ! ! ! ! 511 

 Shipoing .Sugnr-Coatcd Education by the Trunkful 5l'l 

 It Was a Man Dressmaker Who Invented This .514 

 What Is the Leaning Tower of Pisa Compared with 



This? .... . , i;^,. 



Using the Steam Radiator to Remove Wall-Paper 5(4 

 Dropping 10 Safety Irom a Fire 5(,s 



Pumping Up Flis Interest in Your Wares .!.!!! 567 

 Where the Linen Collar Started and Who Started It 56R 

 Krnioving I ligh l.nnip Riillts 171 



