viii INDEX TO VOLUME 89 Page A Safety-Bicycle for the Timid Fat Man 572 Hunting Destructive Animals in National Forests 576 A Warning to Fishermen. 590 The Sidewalk Coaster Becomes an Automobile. 592 Training the Football Tackler. 643 Letting the Jumping Rope Record the Jumps 646 Stilt-Skates for Ice-Skating. 646 Scoring Target Practice by Telephone. 682 Timing Automobile Speed Demons. 806 A Bicycle Which Won't Let You Lose Your Balance 813 Trapshooting in the Navy. 817 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 Toys Which Instruct as Well as Entertain 902-905 A Buffer to Stop Sprinters in Indoor Sports. 932 Building a Speedy Ice-Yacht. 941
THINGS THAT MAKE FOR EFFICIENCY Lighting the Inside of an Oven 16 A Measuring Machine More Sensitive Than a Human Being. 16 A Mechanical Whip. 17 Hearing Your Men at Work 30 Interchangeable Pressing and Steaming Device for Tailors. 30 Fighting Timber Fires. 63 The Finger Talk of Chicago's Wheat-Pit. 81 A Wallpaper Remover. 119 Modern Dog-Catchers Use Motor-Trucks. 176 Extinguishing an Oil Fire with Carbon-Dioxide Foam 178 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 The 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. 314
WAR PROBLEMS IN AMERICA
The Mine That Hears 3 Six Battleships Go Into Reserve. 53 The Feminine Gender of Preparedness. 71 Throwing a Line of Communications Across a River 179- Pneumatic Gun with a Dynamite Shell. 192 The Submarine Blockade Runner 227 Putting the Rookie Through the Mill at Plattsburg 268-269 The Motorcycle Machine-Gun. 529 The Night Eyes of the Coast Artillery 586 Our First Armored Car.. 588 Introducing Our First Anti-Aircraft Gun 657 Collecting Money for Belgians by a Sidewalk Chute 668 The Thousand-Foot Battleship. 670 Defending America with Motor Torpedo Boats. 721 Saving Men from Sunken Submarines. 803 Wigwagging with Hand Flags 807 Taking Care of Automobile Tires at the Front 810 A Field 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 Information for Strangers 7 How Sea Caves Are Made 21 A Lamb with Two Coats of Wool 21 A "Shon-Fly" for a Candy Kitchen 28 A Protecting Holder for an Open-Faced Watch 29 Nations Bleed in Peace as Well as in War 62 The Official City Fly-Catcher of Redlands.California 64 Preparedness Against Bank Burglars 74 Experimenting with the Siphon. 82 New York Is the World's Luxury Market 83 Dipping Elk to Rid Them of Ticks 88 Ostrich Squab: A New Delicacy. 88 The Amazing Beetle 94 Insect Carpenters and Manons. 95 Air-Propeller Drives Bicycle 97 Electric Plant Run by an Artesian Well. 97 Straw Raincoats of Japan. 101
Page What? Only Three Kinds of Feet? 101 Mosquitoes on Snow Banks. 106 A Watch-Like Coin-Case 106 Fish Hatched in Artesian Basin 107 How Indians Graduate from Carlisle. 108 Prize Winners of Sam Loyd's Puzzles 112 We Paid Six Dollars for These Two Pictures. 161 How the Porto Rican Does a Pushing Business. 173 Blending Twelve Grades of Oil Into One 174 A Perfect Megaphone Shaped Like a Ram's Horn 175 The Cockroach Attracts Attention as a Trouble-Maker 176 Origin of Gas Jets Traced to Woman's Thimble. 177 Blow-Pipes of the Borneo Land Dyaks. 179 Throwing a Line of Communications Across a River 179 A Cane to Help the Convalescent Soldier 183 Wind Cave Excels Mammoth Cave 183 A Deep-Sea Fish Which Has a Lantern of Its Own 185 A Sailor's Nautical Wind-Wheel 185 If We Had Eyes Like Microscopes. 190 Trapping English Sparrows for Food 194 How a Snail's Tongue Cleans the Aquarium 195 Machines That Smoke Cigars 196 A Mud Mosaic in the Wake of the Treacherous Colorado 197 Rocks Composed of Diatom Earth Which Float 197 Fighting the Sand Peril 198 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 "Canning" Them 203 An Old 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 241 What Makes the Hair Suddenly Turn Gray?. 247 Signaling with a Mirror to Men in the Field 252 Why 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 Cuban Waters 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 Brandy Is Made. 333 Shooting the Chutes to Safety in an Explosion 360 A Castle Built of Coal to Advertise the Resources of Tennessee 362 Defying the Action of Fire 366 A "Soap Which Is Not Used for Cleansing 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 Petroleum 385 A Rapid Firing Life Saver 389 A Level and Grade Finder on the Periscope Principle 390 Plenty of Room for All Europe 431 New American Porcelain Utensils a Result of the War 431 Spontaneous Combustion 435 Tracing Magazine Cuts 436 Steel Cutlery Which Will Not Rust 485 And This in a Mechanical Age! 503 A Famous Outdoor Organ. 510 The Money Value of Two Great Discoveries 511 Shipping Sugar-Coated Education by the Trunkful 519 It Was a Man Dressmaker Who Invented This 534 What Is the Leaning Tower of Pisa Compared with This? 556 Using the Steam Radiator to Remove Wall-Paper 564 Dropping to Safety from a Fire. 565 Pumping Up His Interest in Your Wares 567 Where the Linen Collar Started and Who Started It 568 Removing High Lamp Bulbs. 573
