INDEX TO VOLUME 91 



Page 



The Unbeaten "Constitution" 242 



The Largest Model of a Ship Under a Roof 252 



Disguised Submarines 265 



Giant Mushroom Anchors for Holding Buoys .... 265 



Practical Motor-Boating 275 



Toy Compressed Air Boats 297 



A Paddle- Wheel Canoe 393 



A New Life-Saving Platform 408 



Practical Motor-Boating 426 



Making the River Drive a Ferry Boat •. . . 432 



The Graveyard of Ships That Passed in the Night . 520 

 The Life-Preserver Is More Important Than Meals 



Aboard Ship 521 



Boats That Travel on Land and Water 525 



She Launches Seaplanes and She's Unsinkable .... 529 



A Houseboat of Marble 538 



Even a Battleship Would Sink If It Were Not 



Cleaned 554 



Shall We Build Concrete Ships? 556 



She Was Torpedoed but Her Cargo Plugged the Hole 569 



Signaling Storms to Mariners 582 



A Leopard Ship of the Sea 645 



What's Wrong with the Submarine 682 



Cast-Steel Ships 690 



A Bungalow Takes a Sail Across San Francisco Bay 751 



A Thriving Fishing Village That Floats 760 



Raising Sunken Ships with Collapsible Air Bags . . 829 

 Boat Carries Engine in Its Fin 872 



SPORTS AND PASTIMES 



Dickory, Dickory, Dock, the Mouse Ran Up the — 



Clock 29 



A Refrigerator Basket for the Picnic Outing 31 



A Many-Sided Bathing Cap 69 



This Board Will Help You Learn to Swim 85 



A Vast Fortune Is Chewed Up Every Year 103 



Land Skates with Brakes and Pneumatic Tires ... 109 

 Rafting the Rapids on the Rio Grande in Jamaica 1 10 



A Rein-Spur 190 



Scraping a Baseball Bat 214 



An Automatic Bait-Casting Fishing Rod 226 



The Speed of a Baseball 227 



This Spoon Hook Won't Tangle 240 



Conquering Your Cramps Under Water 250 



With an Axe and Two Springboards He Chops His 



Way Up a 120-Foot Tree 253 



A Hook and Bait Carrier ( 326 



Shooting Snapping Turtles 368 



A New Game of Pocket Billiards 388 



Anchoring the Fisherman to the Fishing Pier 392 



An Amusement Park in a Vacant Lot 412 



Hitching a Fishing Line to a Kite 412 



Detecting the Undertow Before It Catches the 



Swimmer 43 I 



Pulling and Pushing to Make the Swing Go 524 



Lowering the Life-Boats by Means of Gear- 

 Operated Davits 533 



Put These Webbed Gloves on and Swim Like a Duck 532 

 Maltreating a Water Bottle to Test Its Strength. . 536 

 Making a Mule Push and Pull at the Same Time . 586 

 A Water-Cooling and Purifying Pipe for the Fastid- 

 ious Smoker 590 



The Suitcase Talking-Machine 644 



The American Boy's Wagon 670 



Looping the Loop in a Rocking Chair 673 



Fishing for Herring with a Windmill 724 



Making the Swimming Pool Attractive 725 



Playing Patriotic Tunes on the Air-Brake 737 



Making Comfortable Quarters for the Pet Snake . . 829 



Eskimos of Alaska Held a Reindeer Fair 837 



The Pull-Motor 842 



Watch-Case Revolver 843 



Mechanical Toys 862-63 



A Christmas Tree Stand 874 



A Jungle in a School- Yard 880 



The Home-Made Ice Sleds of the Chinese Boys. .881 



A Toy Gun for the Pacifists 883 



Novel Color Mixer for Teaching Color Effects ... 888 

 A Billiard Table That Folds Up When Not in Use . 909 



A Mouse Spins Cotton Thread 912 



Winning an Athlete's Laurels 943 



MISCELLANY 



The Largest Straw Hat in the World Is Yours If It 



Fits 24 



Page 



Is Curled Hair Becoming Stylish in Japan? 26 



These Magnifying Glasses Are Worn Like Spec- 

 tacles ...;.. 29 



Making a Second "Self" for Dressmaking Purposes 48 



Ingenious Toys Made by Soldiers 57 



A Hair-Drying Frame 61 



A German Medal Commemorating the Sinking of 



the Lusitania 66 



. A Safety Chain for Your Pocketbook 69 



Platinum Is Too Useful to Be Used as Jewelry. . . 69 

 A Twelve-Year-Old Inventor's Combination Um- 

 brella and Rain-Cape 91 



The Straw Hat for Storms 95 



Giving Convicts a Real Chance 98 



This Really Happens More Often Than You'd 



Think 101 



Five Hundred Indian Languages 165 



Mechanical Hair-Parter 165 



A Tight Cord Fastener 166 



Foiling the Pickpocket and Protecting Your Watch 167 



Use Your Natural Arm If a Craftsman 187 



A Helmet for Smoke-Filled Rooms 1 99 



A Chinese Composing Room 202 



Wire Hood for Protection Against Mosquitoes .... 202 



Teaching the Blind How to Write on Straight Lines 208 



Deadening Noise by Pasting Tar Paper on Floors 228 



A Pencil with Nine Good Points 228 



A Novel Change Receptacle 233 



An Open- Air Barber Shop '. 235 



Wild Goats Live on the Roof 236 



Cold Water Pipes to Cool a Room 246 



Another Improvement on the Policeman's "Billy" 247 



A Fortune from Old Razor Blades 248 



Fifty-five Packages of Chewing Gum for Everybody 249 



Wave Your Cane Flag 249 



An Accommodating Church — It Goes Wherever 



It Is Wanted 260 



If Your Parrot Thirsts, Give Him a Drink 260 



A Buttonhole Watch 261 



An Automatic Revolver No Bigger Than Your 



Watch 262 



The Rate at Which Food Prices Have Advanced . . 265 



The Dumb Turk. He Smokes Cigarettes 268 



The Outdoor Trap for the Anti-Fly Campaign . . 271 



Holding the Whetstone Where It Is Needed 273 



Going to College to Learn Wood Graining 274 



The "Swat the Fly" Campaign Is On 274 



Collecting Old Newspapers 280 



A Paper-Disk Flipper 329 



A Kitchen on Wheels 348 



Washing for Gold in the Guianas 349 



Risking Lives in Government Surveys 352 



Cardboard Covers for School Desks 352 



Eat More Fruit and Drink Less Water 353 



Using a Dozen Different Inks Without Mistake. . 354 



Making Mud-Highways 362 



Food for the Taking 374 



The Broomstick Periscope 378 



Why Are Skirts So Short? 378 



The Biggest Bible 384 



An Encounter Between Fire and Ice 389 



A Heel Which Wears Straight 394 



The Candle Industry Still Flourishes 397 



Float Made of Raisins 397 



Self-Operated Cradle 400 



A Fire Hose with Ten Nozzles 408 



A Waving Flag for Your Buttonhole 409 



This Device Won't Let Your Hat Blow Off 411 



Measuring the Wear on Roads 413 



Goats' Milk Saves Babies' Lives 416 



A "Safety First" Device for the Bill Folder 417 



Experts Punch the Time Clock for Slow Stevedores 418 



A Shrewd Marketwoman Made of Figs 418 



What's Become of the Breweries? 423 



A New Clock Scheme for the Daylight Saving Plan 432 



The Umbrella Hat 484 



From Soup to Nuts . 514 



Work the Typewriter Standing or Sitting. 516 



Each Salesman Has His Own Telephone in This 



Grocery 516 



A Pencil-Pen Without Wood, Rubber or Graphic 520 



Two Ties in One . •. 522 



It Holds and Presses Your Tie at the Same Time. . 522 



In Japan the Barber Cleans His Patron's Ears. . . 524 

 It Takes About 150 Pounds Pressure to Break an 



Egg 525 



What Makes a Man a Criminal 526 



