INDKX TO VOLUME iH 



Page 

 "Stretching" a Pound of Butter to Make Two 



Pounds 539 



Self-Contained Hot Water Foot Warmer 602 



Circulating Air in Room to Warm It Evenly 602 



How to Repair a Worn Wash Bowl Plug 611 



Control Water in Bath Tub 612 



Portable Smoke-House 673 



An Electric Cooker for the Kitchenette 673 



Keyhole Finder 677 



Housekeeping Made Easy 680—681 



Converting Ordinary Chair Into High Chair 706 



A Baby-in-the-Tree-Top Hammock 738 



Safe Ladder 744 



A Simple and Effective Heat-Economizing Stove 746 



Housekeeping Made Easy 840-41 



You Can Carry It in Your Hand and It Saves Fuel 880 

 Making Window-Cleaning Safe 903 



INDUSTRIAL PROGRESS 



A Los Angeles Newsboy Increased Business 24 



Where Your Bond Money Went 28 



Weighing Goods in the Air 35 



Utilizing the Garbage to Conserve the Heat Supply 38 



Master Craftsmen, Navy-Made 44 



Office Appliances 52 



An American Fortune Spent for an English Inven- 

 tion 79 



Making Millions Out of Bubbles 82 



Making Rope . 168-169 



Some Unusual Occupations 1 72- 1 73 



Making Jeweled Combs 175 



England's Heroines Are in Her Ammunition Plants 178 



Preparing Commercial Isinglass 182-183 



Knit, and Let the Machine Knit Too 194 



Reducing the Egg Loss Due to Breakage in Ship- 

 ment 207 



A Store That Runs Itself 209 



A Machine Presses Newspapers into Bricks for 



Burning 214 



Little Winston-Salem Is Our BiggestTobacco Center 255 

 Wood Flour Is a New Product Made from Sawdust 275 



Making a Ram Drive a Cream Separator 280 



Making Bone Black from Scraps of Leather ..... 282 

 Qualities of Steel and Wrought Iron for Plumbing 283 

 Where Fiber May Be Used as a Fireproof Material 314 

 Invention of New Steel Like Military Victory. . . . 325 



Packing Sardines 330 



New Idea in Hospital Building 346 



America Needs Potash 362 



Baling Waste Paper 369 



Weaving Rubber-Coated Fabric in Auto Tires. . . . 387 



Office Appliances 395 



Merits of the Wooden Barrel 400 



Varnish and Varnishing 402 



We Are Making Our Own Indigo Now 405 



Wherein a Head and a Little Ingenuity Save Much 



Work 409 



Raising Sponges on a Bed of Cement 418 



Saving Man Power in Loading Freight Cars 426 



Banana Fiber Bags for Raw Sugar Containers. . . . 665 



A Safety Lock for Sewing-Machine Treadles 670 



The Salt Industry's Profit 673 



Cost of Writing Letters 677 



Separating Mixed Gas and Oil 677 



A Simple Adding Machine 697 



Extinguishing Fires in Coal Piles 703 



Utilizing Fruit Skins 707 



Office Appliances 718 



Brick Manufacturers FindThis a Great Labor Saver 750 

 Handling Hot Firebricks with Asbestos Mittens. . 753 



Old Tin Cans Figure in Milady's Costume 825 



No Very Great Danger in Making Ejcplosives 832 



This Press Makes Two Thousand Bricks a Day. . . 837 



Making Use of Tomato Seeds and Skins 839 



Ideal Industrial Loconrjotive 851 



Office Appliances 852 



MECHANICAL ENGINEERING 



A Blind French Soldier Invents a Stenographic 



Machine 6 



The Largest Forging Hammer 65 



Work the Brake--Quick 1 Or You'll Hit the Dummy 1 92 

 A Fowl and Its Feathers Are Soon Parted — With 



This Machine 1 96 



New Key Hole Saw Which Will Not Jam or Bind 200 



A Twentieth Century Treadmill in China 205 



Page 



The Brainless Drink-Mixer 205 



What High Pressure Means to New York'a Fire 



Department 214 



Demolishing a Building with a Ball 215 



Useful Mechanical Improvements 238-239 



Even Milk Bottle Openers Are Problems in 



Mechanics 247 



Cleaning Five Hundred Blackboard Eraaers at a 



Time 249 



Punching Holes in Steel Plates 251 



Driving Eight Hundred and Fifty Rivets a Minute 



in a Trunk 26 1 



Cooling Engine Water in Wooden Chimneys 264 



How Tools Are Doing Their Bit 265 



"Transfer, Please," Is Answered by an Automatic 



Machine 267 



Shut Yourself Up in Your Can-Bed for the Night 268 

 Mercury Used for a Thrust Bearing on an Upright 



Shaft 291 



Steaming Frozen Coal Out of Freight Cars 345 



Carrying Off Smoke and Foul Air in the Same 



Smokestack 352 



Fire-Escape Elevator 355 



Mechanical Helps 394 



U.S.S. New York Made of Pipes and Fittings 400 



Wherein a Head and a Little Ingenuity Save Much 



Work 409 



New Attachment Gears Up Bicycle 427 



Wrapping Taffy by Machine . 317 



Mechanical Helps 542 



It Eats Nickels and Hlimes and Counts 'Em Too. . 568 



A Pair of Socks Every Thirty-five Minutes 685 



Heating Tar and Gravel Separately but in One 



Operation 697 



Mechanical Helps 719 



Grading Machine Does Work of 125 Men 731 



Paint That Barn by Machine 746 



Flexible as India Rubber but Stronger 755 



Saws Without Teeth to Cut Through Metal 824 



Unloading Freight Cars by Machinery 833 



Building a Subway Under a Subway 844 



Mechanical Helps 853 



Wafting Five Tons About as Though They Were 



Thistledown 876 



This Moving Van Loads from the Side 876 



Holding the Screw to the Screw-Driver 897 



Flexible Coupling Takes Side Strain Off Shafting . . 908 

 Making Water Pump Itself 919 



MEDICINE, SURGERY AND HYGIENE 



Makes Every Glass a Sanitary Drinking Cup. 4 



Why Do You Laugh When You Are Tickled? 31 



Curing Soldiers' Hysterical Deafness 68 



Dentistry in the Army 77 



What Spinal Fluid Tells About Health 97 



Bacteriological Laboratory on Wheels 103 



Novel Medicine Cover 104 



A Chance for the One-Armed Veteran — Let Him 



Become a Dentist 167 



Horse-Dentistry Is a Pleasing Profession 184 



The Illuminated Skeleton Teacher 208 



Soothing Our Soldiers Electrically 210 



Ears Rust Out More Quickly Than They 'Wear Out 219 

 There Is an Increasing Wastage of Adult Life. . . . 276 

 The Diseases for Which Man Blames the Beasts. . 280 



The Germs in a Swimming Pool 327 



Ventilated Costumes for Use in the Arctic Circle. . 344 

 Wire Netting Instead of Wood for Surgical Splint. 350 



Glasses That You Can Wear in Comfort 351 



Mike Has a Nose of Brass, but He Should Worry. 352 

 Ingenious Light Which Physician May Hold in His 



Mouth 353 



Bubble Fountain 425 



The War Is Causing a Decrease in Lunacy 425 



Cultivating Nerve by the Rope Bridge Route. . . . 434 



First Camphor Plant ation . . 504 



Safety Bottle for Poisons 504 



Inflicting Pain to Resuscitate Victims of Electric 



Shock 552 



We Shall Eat When We Grow Old 552 



A Thousand Dentists Will Be in the Army 569 



A Side Piece for Eye Glasses which Will Not Break 579 



Rejuvenating Soiled Absorbent Cotton 584 



Two Boards Studded with Pins Make Bandage 



Folder 595 



If You Work Hard, Eat More Pancakes 600 



