INDEX TO VOLUME 88 



XIX 



Page 



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 



Page 



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 



