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
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