INDEX TO VOLUME 88
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The Dog as a Carrier of Disease 510
A Fresh-Air Tunnel for Your Bedroom 553
Science and the Criminal 555
Cane Holds Doctor's Medicines 563
Pure Water for Six Hundred Thousand People. . 580
Handy Instrument for Physicians 658
Fumigating Has Improved, but Are We Less Afraid
of Germs? 663
Fumigating Tank that Contains R. R. Coach. . . . 664
Sleep Outdoors in This Hotel 669
Disinfecting School Pencils 694
Twitching Muscles by Means of the Electric
Current 699
The Modern "Horse Doctor " at Work 721
Sanitary Refreshment Tables 729
When Should Children Be Held Upside Down?. . . 739 Three-Quartersof Humanity Are Deficient in Lung- Capacity 745
Straightening a Baby Llama's ICnock-ICnees 856
A Whipping Machine to Cure Nervousness 862
X-Rays and the Law 879
MINES AND MINING
An Oil Well Fire That Burned Four Months 3
Oil Is Cheaper Than Coal 18
A Miner's Safety-Electric Lamp 28
Still Enough Coal 79
Nature's Horde of Solid Silver 87
A Piece of Salt That Weighs Two Hundred Tons . , 1 79
Inspecting the Inside of the Earth 232
With the Forty-Niners 267
MOTION PICTURES
A Sandstorm to Order 24
Five Thousand Dollars a Minute 64
Risking His Life to Make a Motion Picture Play . . 65
A Machine That Thinks Up Movie Plots 210
Motion Pictures on the Firing Line 23 I
Wandering Motion Pictures 382
Why Do Moving Pictures Seem So Life-Like? . . . . 386
Capturing Jamaica for a Film Play 396
An Automobile Dressing-Room ror a Motion Pic- ture Actress 554
Expense in Motion Picture Making 570
Motion-Picture Silhouettes 665
More Motion-Pictures in Color 717
The Screen-Player's Make-Up 733
Hazards of Motion-Picture Acting: Real and
Faked 885
MOTOR-TRUCKS
Motor-Truck's Energy Runs a Pipe-Threader. . . . 880 Motor-Trucks Take the Place of Horses 898 901
NAVAL ARCHITECTURE AND NAVAL SCIENCE
Enlisted Men: The Navy's Foundation 171
Our Thirty-five Knot Battle Cruiser 186
PATENTS FOR SIMPLE INVENTIONS
Reading in Bed Made Easy 702
Finger-Ring to Be Used as a Pencil Holder 756
A Clothes Pin with a Sandow Grip 756
Keeping the Heat Out of Milk Cans . . . •. 756
An Electric Whirlpool to Suck Flies to Their Doom 756
A Single-Service Shaving Brush 757
Adjusting the Big Shoe-Stand to the Little Boy. . 757
Finger-Holds for Your Slippery Bath-Tub 757
Does This Solve the Refilling Problem for Fountain
Pens? 758
A Sled for Lawn-Spiinklers 758
This Toothbrush Can Be Used Only Once 758
Brushing Away the Tacks 758
PHOTOGRAPHY
It Looks Like a Telescope, but It's Really a
Camera 225
Handy Dark-room Lamp 263
Is This Actual Color Photography at Last? 417
Fun with Pictures of Your Friends 329
Taking Photographs from a Skyrocket 670
How to Make Spirit Photographs 719
A Substitute for a Condenser When Making En- largements 763
A Device for Numbering Photographic Plates and Films 852
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Submitting Photographs for the London Exhibition 852
A Camera Which Can Be Tilted at Any Angle . . . 889
A Portable Dark-Room for Photographers 903
PRACTICAL WORKERS
A Radium Lightning Rod 1 23
A Glue Scraper 1 24
An Emergency Hack Saw 1 24
Differential Gear for Home-Made Tractors and
Cycle-Cars 124
A Useful Home-Made Glue Brush 1 24
An Effective Window Lock 125
To Make Small Springs 125
How to Case Harden Iron 125
Files and Tools from Switch Handles 125
A Handle for a Small Bit or Drill 125
An Easily Made Marking Gage 125
Home-Made Drill Press I 26
How to Get the Most from a Football 126
A Help in Wire-Twisting 1 26
Ground Detector for Three Wire Circuit 127
Ingenious Circuit Saves Money in Photoplay
Houses 127
A Novel Medical Battery I 28
A Combined Triangle and Protractor 128
A Drawing Cutter 1 28
Overhauling Your Car for the Winter 129
To Make a Work Bench and Vise 139
A Sprinkling Can as a Dark Room Lamp 140
An Adjustable Arc Lamp 1 40
Alcohol. Burner 140
Adjustable Printing-Frame Holder 140
How to Build an Ice Boat 141
How to Draw an Eclipse 1 42
A Doorstep Burglar Alarm 142
A Simple Laboratory Burner 142
Waterproofing Shoes '42
The Danger of Safety Tin Boiler Plugs 246
A Lens That Remains in Focus 259
Makeshift Polarity Indicator 260
For Cracks and Holes 268
To Prevent Bolt from Turning When Unscrewing
Nut 275
Saw Box 275
Potato Roaster for Campers 276
An Electrical Peddler Chaser 276
Prevents Casks Slipping While Unloading 276
An Electric Toy Semaphore 277
Saving Time in Tracing a Design 278
Enlarging a Runabout's Capacity 279
A Non-Spillable Funnel 279
Mat-Making for Photographers 279
Shock Absorbers 280
Key Controls Battery Current 281
Eliminates Pants' Guards for Bicycle Riders. ... 281
An Ingenious Electric Connector 282
A Self-Lighting Arc Light 282
Bending Brass Tubes Without Kinking 282
Enlarging Without Dividers 282
How a Jack Knife Can Be Used as a Compass. . 282
A Try-Square Aid 281
To Prevent Rust 282
Rinsing Photographic Negative* Without Runnmg
Water 283
A Mysterious Motor 283
Small Screws in Difficult Places 283
Fuse for Storage Battery Circuits 284
Filter for Lubricating Oil 284
A Good Belt Compound 285
A Capacity Job . ^ 28l
A Way of Fastening Machme Parts ^03
Substitute for Large Gas Reservoir 285
Ice Skates Make Shoe-shining Stand 285
Sleigh Attachment for Perambulators 286
Drilling Holes in Glass 286
Prevents Insulation Unwmdmg 285
Hydraulic Blowing Arrangement 287
The Care of Paint Brushes 288
Lengthens Life of Blow-Torch Burners 288
Renewable Fuses 288
Emergency Bolts . - , _ iSS
Binding Magazmes mto Book Form ^OV
A Self-Adjusting Sandpaper Block . . . . 293
A New Use for Broken Drills and End Mills 293
A Handy Way to Repair a Tire 293
A Home-made Football Inflater 29 4
A Dust-Proof Bottle for Acid 294
A Multiple Punch 294
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