INDEX TO VOLUME 91
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Hand Bob-Sleds Made of Barrel Staves 934
Making Butt Mortises with an Ordinary Rabbet
Plane 934
Making a Talking Machine Stylus from a Tooth- pick 934
Making a Whistling Weather Vane for the Barn . . 934
Windng a Coil Spring Evenly 934
Cutting Rafters for Gothic Roof Barn Construction 935 Fruit Jar Rubber Ring to Repair Bicycle Tire
Puncture 935
The Proper Care of a Soldier's Wardrobe 935
Improving the Qualities of Cheap Lead Pencils... 936
A Barrel Stave Iceboat 937
A Homemade Sight Feed Oil Indicator for an Auto- mobile 938
A Simple Method of Fastening Umbrella Handles 938
Simple Designs for Sheet Metal Working. . 939
Garden Hose Used as a Form for Cement Pipe. . . 941
Eliminating Noise from Shift Levers 941
Repairing a Scratch on an Automobile 941
How to Straighten a Warped Drawing Board. . . . 942 Making a High Gloss Finish on a Matt Surface
Picture 942
Protecting Drawings on Drawing Board 942
Setting a Lathe Quickly for Taper Turning 942
Teeth of a Hack-Saw Blade Used for Spacing on
Section Liner , 946
How to Make a Secure Joint in Copper Tubing. . . 948 Things to Know About Lubricants for Machinery . 948 Constructing a Thermostat to Regulate Furnace 953 A Coating to Make a Battery-Box Acid Proof .... 954 Heating Sheet Hard Rubber to Cut Round Disks . . 959 Lighting the Dash-Board of an Auto from the Side
Light 960
Sheet Asbestos to Make a Packing for Steam Chests 960
RADIO COMMUNICATION
"Silent Music" — Recreation for the Bedridden. . . 28 Curious Circuit for Audion on a Wireless Set. ... 151
Conversion of Kilometers to Nautical Miles 151
An Experimental Wireless Aerial Made of Zither
Strings 151
To Prevent the Ears Perspiring When Wearing
Telephones 152
Mounting Tinfoil on Glass Condenser Plates 152
How Germany's Secret Service Wireless Stations
Are Being Weeded Out 1 53
A Crystal Detector Holder for Wireless Apparatus 155 Effect of the Moon and Season on Wireless in the
Tropics 1 55
A Trussed Aerial Spreader for Long Wires 1 56
Position of Wireless Waves Passing Over Land. . . 156 Cloudy Days Best for Wireless Wave Signals .... 1 56 Improving the Tone of a Test Buzzer Used on Wire- less Detector 1 56
Simple Construction of a Rotary Gap Disk 1 56
Simple Solutions of Wireless Problems 157
Magnetic Brake for a Wireless Rotary Gap 160
Adjusting the Detector of a Receiving Set 160
How theJGovernment Seals Unofficial Stations . . 208 A Simple Arc Lamp Using a Thermostat Control . . 308
Slow Acting or Sluggish Relays 308
An Ingenious Wiring System for Two Inductive
Transformers 310
A Variable Condenser for a Receiving Set 310
An Amplifying Electrostatic Radio Receiver 311
Treating Cardboard Tubes for Tuners 311
Strong Wireless Signals in Winter Time 312
A Testing Set That Does Not Use a Battery .... 312 How the Radio Inspectors Trapped a Disorderly
Amateur 313
How to Make a Kick-Back Preventer for Wireless
Apparatus 314
A Use for Discarded Cylindrical Food Boxes 314
Variable Primary Coil Using a Switch Instead of a
Slider 314
America's New Semi- Wireless System for Telephon- ing from Captive Balloons 315
A Polarity-Changer for Reversing Lighting Battery
Current 315
Dormitory Beds Furnish the Essential for Antennas 3 1 6
An Insulation for Secondary Terminals 316
Wireless Work in Wartime 317
A Simple Fixed Adjustment Detector 320 ,
An Audion Battery Made of Medicine Vials 441
An Easily Adjusted Detector-Stand 441
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Wireless Signals Transmitted by Telephone 442
Fighting the Big Guns with Wireless 443
Supplanting the School Bell with Wireless 445
How to Make a Variable Condenser for Five Cents 446
Wireless Work in Wartime 447
An Inexpensive and Quickly Made Detector 450
Relieving the Strains on Aerials 450
Sustained Wave Telegraphy Between the United
States and Germany 451
Double Set of Receivers for Visitors 453
A High Voltage Lead-in Insulator Tube 453
Loading Coil in Series with the Secondary 453
A Ticker Interrupter Made from a Buzzer 454
A Simple and Attractive Loading Coil 601
Transmitting Wireless Messages Underground
Without Aerial 602
Sending Wireless Messages Under Fire 603
Construction of a Rotating Arm for a Rotary Gap 606
Wireless Work in Wartime 607
A Grid Placed in the Wings of an Airplane 614
I ncreasing the Efficiency of the One-I nch Spark Coil 787
Wireless Work in Wartime 793
A Strong Guy- Wire Anchor for Aerial Poles 797
A Magnetic Telegraph Key for the Wireless Operator 798 Ballast Weights for Antenna to Prevent Aerial from
Overturning 800
The Marconi Company Sues the Government .... 913
Detecting Defective Insulators 914
The Human Morse Code 950
An Inexpensive Multi-Point Loading Coil 953
Water Glass Gage for a Lead-in Insulator 954
Wireless Work in Wartime 955
An Easily Constructed High Tension Insulator. . . 959
RAILWAYS
This Railroad Crossing Cleans Itself and Eliminates
Jolts 5
Attacking Mail-Car Robbers with Deadly Fumes. 27 Owens Valley, California, Has a Freight-Car Hotel 87
Can the Railway Train Be Made Noiseless? 92
Flushing Streets with Water Pipes on Trolley Cars 107
Street Railway Smoking Car 214
The Largest Traveling Kitchen 224
The Biggest Locomotive 251
A Refrigerator Car That Really Works 394
The Most Powerful Locomotive in the World .... 396
Street Cars Pull Each Other Up , . 41 I
A Sanitary Dining Car 418
Solving the Car Shortage Problem 422
Lest the Engineer Forget 436
Canning the Baby in a Super Sleeper 513
How Print Butter Is Shipped to the Retailer 519
Flagman's Shelter House Built Like a Mosque. . . 551 Safeguarding Our Bridge and Railroad Crossings . . 565 Putting Driving Wheels Under the Locomotive
Tender 570
A Lift Deck for Automobile Freight Cars 592
A Lumberman's Camp Which Can Be Moved from
Place to Place on Rails 598
Special Cars for Persons Carrying Parcels 708
Loading Cattle on Trains in a New Way 723
Diminutive Electric Locomotives 738
How a Railroad Steam-Shovel Traveled Through
New York City 747
An Iron "Flag" for Protecting the Railroad Car
Inspector Against Injury. 755
Keeping the Trains from Being Blown Off the
Tracks 824
A One-Man Rail Grinder 825
A Labor-Saving Dump Car 884
SHIPS AND SHIP BUILDING
Why You Can't Compare Ships in Tons 29
A New Life-Boat 60
Salvaging in Armor 93
Motor Attachment Which Prevents the Rowboat
Propeller from Being Injured 96
The Latest Salvaging Device — An Electromagnet . 113 An Electric Eye Watches the Smoke Screen During
a Battle 115
Practical Motor-Boating 116
A Two-Million-Dollar Hospital Ship 206
A Ship with Six Hulls 209
The U.S.S. "Recruit" 212
New Type of Life Boat 223
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