INDEX TO VOLUME 88
��Page
A Tuning-Coil Slider 468
Reconstructing a Dry Battery 469
Mounting Spark-Gaps to Elliminate Unnecessary
Noise 471
Winding Tuning-Coils 47 I
What Radio Readers Want to Know 472
Money Prizes tor Radio Articles 481
An Undamped Wave Receiver 613
The Tuning of Radio Telegraph Receivers 619
How to Build the Mast for a Wireless 623
What Radio Readers Want to Know 627
How to Fit Cables Into Small Terminal Holes. . . . 762
Damping in Radio Circuits 775
A National Wireless Association 779
Lamp Resistance for Charging Storage Batteries. . 781
An Unusual Recording Receiver 782
Tubular Quenched Gap 782
Telephone Receivers 783
Learning the Code 783
Magnetic Adjustment of Audion 783
An Electromagnetic Rectifier and a Polarized Relay 784
Inexpensive Stranded Aerial Wire 785
Automatic Dead-End Switch 785
Audion of Increased Sensitiveness 787
Repairing a Burnt-Out Fuse 788
Constructing a Variable Condenser 787
What Radio Readers Want to Know 790
Sharpness of Tuning in Radio 935
Antenna Wire Strength 940
Preventing the Audion from Choking 943
Unit Type of Plate Gap 943
The Non-Synchronous Rotary Gap 944
Quenched Gap Damping 944
A Wireless Log for the Amateur 944
Japanese Wireless Telephone 947
Radio Tower at Tufts College 949
What Radio Readers Want to Know 950
RAILWAYS
Locomotives Serve as Fire Engines 8
Artificial Rainstorm Tests Car Roofs 10
Sidewalk Shelters for the Trolley Patrons of
Cincinnati 10
Telephoning from a Moving Train 11
A Boy's Wonderful Working Locomotive Model. . 25
The Steam Engine in War 74
Motor Car Mows Railroad Weeds 79
Publishing a Paper Aboard a Train 185
To Keep Automobiles Off Railroad Tracks 224
The Size of a Railway Station 233
New York Trains That Play Leap Frog 245
Process for Painting Cars Rapidly 261
Catching Eggs from Swiftly-Moving Trains 343
Railroad Gate Warns and Stops Reckless Motorists 373
Baking a Railroad Car to Dry the Paint 423
Tamping Railroad Ballast with a New Air-Tool . . 536
Stopping the Speeder with a New Danger Sign . . 541
Not a Toy — A Real Locomotive 490
Asleep on the Sleepers 688
How Fast Is Your Train Moving? 693
Burning Cars to Make Money 714
How a Second-Hand Automobile Made a Railroad
Pay. ... 732
A Fire-Fighting Trolley Car 735
A Scientifically Designed Train-Announcing Mega- phone 741
A Continuous Railway Crossing 745
A Successful Railroad 828
Expensive Transportation 890
A Traveling Laboratory for Testing Railway Scales 890
RECREATION
Curved Spring Device Returns Bowling Balls. ... 813
Ice Skating in Summer Without Ice 908
Answers to Sam Loyd's April and May Puz- zles 912 913
Kite Making at Home 92 I
A Camper's Dutch Oven 934
ROAD BUILDING
A Three Million Dollar Automobile Scenic Highway 56
Perils of the Bad Road 226
An Automobile Road Sign and a Map Combined. . 229
Applying Hot Road Material 267
Blasting for Good Roads 750
Bad Roads Make Bad Going 829
"Once Over" and the Road Is Done 876
��SHIPS AND SHIPPING Page
New Diver's Suit Does Away with the Hand Pump 29 Gangway Life-Saver Prevents Crushing of Life
Boats 58
Gliding Boat for Tropical River Mail Service ... 74 Saving Men from Scalding Steam in Steamship
Engine Rooms 254
Detecting Fires in the Holds of Trans-Atlantic
Liners 257
Steamer Breaks Back in Storm 335
A Submarine That Dived but Once 391
The Unabashed Fish and the Noisy Motor Boat . . 393
A Dreadnought's Buoy 404
Floating a Sunken Warship on a Bubble of Air. . . 405
Taming Those Harbor Pirates 498
A Calking Compound 505
Italians Build Highest Powered Motor Ship 541
Breaking Storm Billows with Compressed Air ... 561
The Undependable Fog-Horn 575
Miniature Ships That Were Built to Prove a Point 580
Reverses Tug's Propeller Blades 663
Exit the Mississippi Stern- Wheeler: Enter the
Motor Barge 696
Making a Life-Saver of a Leak _ 700
Using Triggers to Launch Uncle Sam's Battle-ships 703 Making Your Own Boat Repairs Under Water. . 711
Submarine Signaling with Sound Waves 712
Ancient Battleship Ideas Revived 737
A New Way of Loading Steamers from Freight Cars 829
SOUND RECORDING AND TRANSMISSION
Edison's Phonograph Diaphragm to Record Only
Faint Sounds 10
Selling by Show- Window Telephone 18
A New Device for Recording Sounds 58
Hearing the Stones on a River's Bed 92
WAR PROBLEMS IN AMERICA
Forts that Travel on Rails 323
A Torpedo with Eyes 424
Our Helpless Coast Defenses 499
Helpless United States 689
Undersea Fighting of the Future 803
THE WAR AND ITS EFFECTS
How War Mobilizes the Non-Combatant 812
London War Affects Baby Carriages 812
The Gentlest Bullet 819
Marvelous War Map 828
War and Trade 833
How the War Is Being Fought 834 849
WHAT'S NEW IN PATENTS
Erasing Attachment for Typewriters 105
Soda Fountain in a Suitcase . . 105
A Finger-Knife for Egyptian Corn 105
Foiling the Safe Blower ' I '
Baby's Bottle Holder I 58
Tool for Stripping Insulation I 58
Electrically Lighted Pencil 1 58
Combined Door Bel! and Mail Receiver 1 58
An Aid to the Veterinary 1 58
A Room Stove Water Heater 1 58
Sanitary Kneading Board '59
Self-Feeding Soldering Iron '59
A Pad and Pencil Holder for the Telephone 159
Folding Tooth Brush I 59
Apparatus for Cleaning Hair Brushes I 59
Combination Sad-iron Heather and Cooking
Utensil '59
Shoe Polishing Device •(>0
Opening and Closing Garbage Cans with the Foot . 160
Purse in Palm of Glove 160
Anti-Skidding Chain 160
Walking Stick Becomes a Seat 160
Meal-Holder Which Makes Slicing Easy 160
New Headlight Dimmer 272
Keeping Your Sole Warm 272
Adjusting a Brush to Its Handle 272
For Applying Chains to Wheels 272
Combined Egg-Tester and Mailing Tube 272
Clothes Rack Dryer 272
Combined Coat Hanger and Trousers Stretcher. . . 273
Making It F.asy for the Birds 273
A Simple Signal for Automobiles 273
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