INDEX TO VOLUME 91 



MECHANICAL ENGINEERING Page 



This Typewriter Prints in Every Type and Lan- 

 guage 5 



Is Your Typist a Rapid Operator? This Machine 



Will Time Her 25 



Big Steel Guns and How They Are Made . '. 38 



Typewriting in Code 59 



Mechanical Appliances 74-75 



A Cushioning Drawbridge Gate 80 



A Safety Coat for Workmen 96 



The Last Word in Fountain Pen Efficiency — An 



Eraser Attachment 97 



Removing Iron Rivets with a Pneumatic Hammer 97 

 With the Warm Weather Come Improvements in 



Ice-Cream Making 1 00 



Safety Nets of Rope for Skyscraper Workers .... 114 



Largest Indoor Waterfall 166 



A Street Cleaner Built Like a Carpet Sweeper .... 203 



Mechanical Appliances 210-21 1 



A Coal Mine in His Cellar 215 



Repairing Flag Pole Without Steeplejack 216 



Canning Beans by Machinery 221 



A Portable Elevated Saw 228 



A New Addressing Machine 234 



A Conveyor for Loading Coal 237 



A Self-Propelling Sprinkler 240 



A Mechanical Bank Teller 245 



The Needle Bath in Shell Making 248 



A Portable Nail Distributor 249 



T he Evaporation of Water Drives This Remarkable 



Clock 254 



One Horsepower Will Run All the Watches in the 



World ...261 



A Small Sand Spreader Is Useful All the Year 



Round 263 



Panning for Gold in Central and South America . . 264 



The Compressed-Air Orchestra 265 



The Efficient Garbage Collector 397 



Mechanical Kinks 398-9 



A Machine for Reclaiming Scrap Material 410 



Three Roadmaking Machines in One 421 



A Time-Saver for the Repairman 425 



Standardizing the Die-Sinker 440 



Gear Wheels Made of Cotton 517 



Steam Jets Which Save Thousands of Dollars in 



Large Power Plants 523 



Do It with Tools and Machinery 534-535 



Stamping Two Thousand Letters an Hour 537 



A Substitute for Forms in Concrete Roofs and 



Floors 543 



An Iron Worker's Steel Glove 544 



How One Furnace Can Save a Big Slice of the 



Country's Coal Bills 564 



We Burn Coal Lavishly, but We Have Plenty to 



Burn 567 



Making a Fortune Out of Cement Factory Dust . . 569 



Blowing Stumps Away with Air 576 



Welding Ten Miles of Pipe for a Skating Rink .... 584 

 Drilling with This Electric Drill Is Like Shooting a 



Pistol 593 



Let This Automatic Device Feed Your Envelopes . 595 

 The Overdriven Nail and the High Cost of Living. 543 

 Potted Plants as a Part of a Plumber's Equipment 548 

 Perfect Bread Slicing Machine for the Commis- 

 sariat ; 645 



Fastening Motors to Ceilings Without Scaffolding 673 

 Weighing Your Coal by the Ounce or the Pound. . 686 



A Device for Handling Rugs 699 



A Simplified Gasoline Engine 704 



Stamping Oranges 705 



Extinguishing Flames of a Gas Well 708 



Mechanical Appliances 718-719 



The Most Ornamental Smokestack in the World. 734 



How the Cellar Shut-Off Nozzle Originated 740 



This Furnace Practically Takes Care of Itself. . . . 742 



Any Boy Can Build a Concrete Wall 745 



Whirling Concrete Poles into Shape 749 



Fire Doors That Close Themselves 750 



Sorting Letteis with Gravity Chutes 752 



A Valveless Pump for Gearset Grease 753 



Cutting Sheet Metal with a New Machine 757 



Handling Cotton Bales with an Over-Head Trolley 757 



The Giant Crane of the Austrian Navy 758 



A Jeweler's Ruse 760 



A New Siphon That Starts Itself Without Suction 



or Pumping 832 



Turning Valves on Their Seats Automatically. . . . 859 



Page 

 Furnace Burns Soft Coal and Cleans Its Own 



Radiator 867 



Largest Direct-Current Power Plant 868 



Improved Mechanical Appliances 871 



Running the Oven by the Hot-Air Furnace 879 



Making Flour from Pigskin 882 



Barking Wood by Machinery 885 



A Dipper Dredge That Served as a Qrydock 893 



Two Locomotives to the Aid of a Shivering Manu- 

 facturing Plant 899 



Doing the Work of Three Hands with Two, on a 



Soldering Job 900 



Which Way Will the Tree Fall? 901 



New Looms for Old — A Wartime Necessity 904 



A Collapsible Concrete Form Which Works on the 



Principle of an Umbrella 905 



The Smallest Bandsaw 907 



Another Biggest Thing in the World— This Time a 



Riveting Machine 9| 3 



Hot Water in an Instant 920 



MEDICINE. SURGERY AND HYGIENE 



Be Thou Wary of the Bubbling Cup 86 



The Hospital Toothbrush — It Has a Removable 



Pad 95 



The Private Hairbrush — The Bristles Can Be 



Locked Up 95 



The U. S. Armies Prepare to Fight Germs 106 



That Wad of Dental Cotton— Was It Sterilized? . . 107 



An Ice Helmet to Relieve the Fever Patient 115 



Separating Russian Prisoners from Vermin 119 



Chiropodists for the Army 164 



A Holder and Sterilizer for the Toothbrush 205 



Gigantic Models of Mouths 221 



A Single First-Aid Dressing 235 



How Policemen Revive You When You Faint. . . . 237 

 The Feet and Legs of American Citizens Are Un- 

 sound . 263 



Closing Up a Wound Without Using a Surgeon's 



Needle 269 



Feeding Germs on a Special Diet 270 



Inducing Artificial Respiration with a Vacuum. . . 350 



A Device for Supporting the Arch 385 



The Dental Hygienist 387 



A Spring-Motor for the Human Jaw 408 



A Treatment for Distemper in Dogs 434 



If You Lisp or Stammei Use a Mirror or Candle. . 484 

 A Self-inflicted Tug-of-War to Increase Your 



Height 484 



Combination Knife and Fork for the Wounded. . . 485 



Choosing the Air for Our "Castles" 503 



A Crutch Built on the Principle of the Rocking 



Chair " 523 



The Army Medical Museum's Giant Skull 551 



The Massaging Chair 564 



A Huge Barber-Shop Sterilizer on Wheels 583 



This Death's Head Poison Bottle Will Prevent 



Fatal Mistakes 594 



Bomb Exits for America's First Portable Hospital 596 



Fat People Are Unpatriotic 645 



Medical Men in the Army 685 



Open Your Mouth and Let the Doctor Flashlight 



Its Interior. . 687 



Preventing Typhoid 706 



Testing the Fighting Aviator 711 



The Best Night Light for the Sick Room 729 



A Medical Battery No Bigger Than an Ordinary 



Flashlight 731 



How About ThatThird Cup of Coffee for Breakfast? 734 

 Train Your Skin So That It Will Not Be Sensitive 744 



Artificial Lungs for New Born Babies 807 



It Bathes, Massages, and Dries Us 832 



The Old Indian Priests Had No Easy Time of It. . 837 



Toe Spring for Enlarged Joints and Bunions 838 



A Disappearing Crutch 854 



Curing Wounds with Sugar 867 



Fracture Setting Machine 875 



Employing Destructive Gases in the Warfare 



Against the Sleeping Sickness 888 



Using Brine Baths as a Cure for Shell Shock 899 



Examining Recruits for Tuberculosis 909 



Treating the Wounds of the War by Electricity. . 918 



MILITARY AND NAVAL SCIENCE 

 How the Fighters Will Be Fed 6 



