Page 



An Iris Diaphragm for Front and Rear Lights. . . . 535 



Loading a Revolver in Two Seconds 535 



Lubricating a Rifle Barrel with a Graphite Cart- 

 ridge 535 



Mechanical Helps ^'^^lll 



Liberty's Torch ■ • 552 



Strap It on Your Neck and Cut Your Hair Yourself 565 

 Whiz, Whiz Goes This Electric Buzz-Saw as It Cuts 



Up a Beef Carcass 569 



A Perfume Spray from a Penny Slot Machine. . . . 579 



Loading Ashes by the Sky Route ._ 581 



Shave Yourself with a Buzz-Saw — That's the 



Newest in Razors • 585 



A Machine Which Automatically Feeds Twine and 



Cuts It 587 



It Takes Four Thousand Characters to Typewrite 



in Chinese 599 



Foiling Torpedoes with Whirling Plates 643 



Handy Mechanical Appliances 694-695 



The Single-Man Tank 702 



Five Hundred Miles an Hour 705 



A College-Factory Engineering Course 724 



Open the Door and Wind Up the Clock 725 



Ejcit the Stevedore 736 



A Mine-Car Which Unloads Itself 737 



A Bridge of Cables. Boards and Chicken Wire 760 



A One-Man Tree-Felling Saw 851 



New Mechanical Appliances 852-853 



Sorting Mail with a Typewriter 854 



A Re-Inking Typewriter Roller 855 



A "Community" Power Plant 867 



A Trowel Which Places and Molds Concrete Curbs 890 

 Drilling Holes in Concrete on a New Principle. . . 891 

 The Intelligent Trough. It Measures Out Water 



to the Thirsty Animal 895 



This Contractor Carries His Power Shop to His Job 895 

 Freighting a Steamer by the Marine Elevator. . . . 908 

 A Pigmy Electric Crane with the Strength of a 



Giant 912 



MEDICINE. SURGERY AND HYGIENE 



Don't Shoot the Dog — Help Him as If He Were 



Human 3 



A New Method of Identifying Infants 41 



A Supporting Harness for the Wounded 47 



A Machine that Massages Your Pains Away 66 



Sleeping on a Mattress Filled with Water 66 



Every Time We Wink We Give the Eye a Bath . . 68 



A Peculiar Disease of the Teeth 165 



The Lesson Denmark Taught with Calves 182 



How Much Ought We to Weigh Normally? 189 



A Fountain Tooth Brush 194 



Mr. Average Healthy Man's Enormous Appetite. . 195 



A Combination Comb and Toothbrush Holder. ... 197 



A Flag- Waving Device 216 



Simple Method for Pasteurizing Milk 216 



Food Inspection in New York 222 223 



Taking Turkish Baths in Your Own Home 237 



A Convenient Holder for Dental Floss 280 



A Stimulating Climate May Be the Cause of Suicide 280 



A Tooth-Brush Drill for School Children 325 



Teaching Health Lessons with Automobiles and 



Motion-Pictures 344 



Digest Your Food Electrically! You Can Do It 



with a Wireless Apparatus 345 



Helping the Deaf to Hear with a New Electrical 



Ear... 353 



Our Invisible Friends and Foes 366 



Grafting with Frog's Skin 382 



Artificial Feet of Paper Pulp 395 



A Special Shampoo Chair and Basin 400 



Curing the Insane with Water 401 



Portable Moving Platforms 405 



A Stretcher Which Parts in the Middle 406 



Curing Rheumatism with Radium 415 



Supporting the Arch of the Foot with an Elxtra Heel 429 



Pneumatic Tires for Your Shoes 436 



A Tooth-Brush with a Removable Bristle-Pad. . . . 456 



Breathing by Machinery 528 



Fighting General Typhoid 531 



The Bicycle to the Rescue in Leg Treatments. . . . 576 



Bathing in Melted Wax 578 



Rag-Time Music as an Adjunct to the Operating 



Table 585 



Giving the Teeth a Clean Sweep with a Rotary 



Tooth-Brush 587 



Page 

 Massaging the Digestive Organs by Deep Breathing 664 



A Toy Field Hospital for an Object Lesson 673 



Testing the Op)€ration of Wooden Feet and Legs. 681 



A Gentle but Firm Restrainer for the Insane 726 



Getting Rid of Vermin in the Trenches 742 



Restaurant Waiters and Cooks Must Be Mani- 

 cured 805 



Fruit Acid, a Good Mouth Cleanser 828 



Ultra- Violet Rays for Bald Heads 880 



Rubber — An Armor Against Disease Germs 894 



A New First Aid to the Fractured 916 



MOTOR VEHICLES AND THEIR ACCESSORIES 



A Junior Runabout 3 



No Danger of Falling from This Motorcycle 5 



The Motorcycle Becomes Popular for Sledding ... 50 



Turning a Motorcycle into a Motor Ice-Sled 50 



Making a New Motorcycle Record 51 



Smoothing Skating Surfaces with a Motorcycle Ice 



Plow 51 



Combining the Garage with the Home 52-53 



Picking Up Tacks in Front of Your Automobile. . 72 



Putting Railroad Wheels on Automobiles 82 



Automobiles, Motor-Trucks and Accessories. . . .84-87 



A Junior Runabout 106 



Saving Tire-Money 107 



A Wooden Boulevard Over the Desert 116 



Climbing Out of a Mud Hole 118 



Making the Automobile Do the Chores 119 



Paper Funnel for Use in Place of a Grease-Gun. . 122 

 Automobile Luggage-Carrier for the Running 



Board 126 



A License-Tag Holder for the Front Axle of an 



Automobile 126 



Repairing the Torque-Rod Support of an Auto- 

 mobile 1 28 



How to Build Bucket Seats for Automobiles 142 



Why the Tread on Repaired Tires Fails to Stick. . 143 

 Substituting Steam for Gasoline in Automobiles. . 184 



Demountable Road-Oiling Tank 189 



The Road-Rail and Its New Truck 192 



Convert Your Bicycle into a Motorcycle 195 



New Type Motorcycle Uses Two-Cycle Motor with 



Magneto in Flywheel 200 



A Hot Plate Camp Stove for the Automobile Tourist 206 

 To Uitload This Truck You Tilt the Platform ... 208 



You Can See Gas in This Station 216 



Standardizing Our Automobile Shop Language . . . 230 



An Armored Motor-Car for the Navy 231 



Low-Bed Truck Steered by Huge Bull Wheel ... 244 



Removable Steering- Wheel to Foil the Thief 251 



Automobiles, Motor-Trucks and Accessories. . .252-253 

 Bringing the Steering Wheel Back into Position 



Automatically 258 



A Grocery Store on Wheels 267 



Motorcycle Lamp and Horn Combined 270 



Opening Automobile Doors by a Foot Lever 272 



An Oil-Gage Made from a Broomstick 283 



What Do Your Tires Cost You a Mile? 284 



Removing Automobile Engine-Valves Enclosed in a 



Sleeve 290 



A Motor-Manikin Which Waves Its Arms and Yells 344 

 Teaching Health Lessons with Automobiles and 



Motion-Pictures 344 



Hoisted by an Automobile Into the Clouds 352 



A Pushmobile De Luxe for the Youthful Speedster 356 

 Making the Front Axle Help Drive the Automobile 357 



The Workingman's Automobile 357 



A New Ball Differential for Automobiles 360 



Combined Brake and Non-Skid Device for Auto- 

 mobiles 362 



Light Railroading Accomplished by Automobile . . 362 

 Another Addition to the Motor-Bicycle Family. . . 363 



A New Type Motor-Truck for Coal Delivery 363 



Automobiles, Motor-Trucks and Accessories. . . .364—65 



The Automatic Traffic Controller 382 



Learning to Drive an Automobile 385 



A Model 600-Car Garage 386 



An Electric Vulcanizer 391 



Sacrificing Diamonds for Accuracy in Manufactur- 

 ing Automobiles 406 



Operating an Automobile Steering Wheel with 



Oil.. 412 



A Burglar- Alarm for the Automobile 416 



An Automobile Salesroom on Wheels 422 



New Motorcycle with Horizontal Opposed Motor. 427 



