IXDKX TO VOIJME 80
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Cardboard Tubes 275
How a Compact Molded Condenser Is Built 275
Primary Regulator for the Induction Coil 275
Small Radio Stations 275
Lowering t^e Decrement 277
Lighting Audion Bulbs Cheaply 276
Music by Wireless 278
A Substitute for An Aerial 280
Telephone Headbands 280
A Built-Up Wireless Mast 281
A Sending Condenser 282
Adjusting Handles 283
A New Detector Material 284
A Good Loose-Coupler Switch 285
Modified Audion Is New Telephone 285
Reducing Arcing at Key Contacts 285
A Quencned Gap with Metal Spacers 286
Switch Points for Radio Instruments 286
What Radio Readers Want to Know 287
A Microphonic Amplifier 437-
Constructing an Amateur's Aerial 439
Guying the Mast 442
A New Tuner Arrangement 445
Lepel Improves His System 445
A New Variable Condenser . . .• 448
The Quenched Gap 448
A Kick-Back Preventer 448
How to Become a Wireless Operator 449
Curious Form of Dustproof Detector Cup 452
A Rotary Adjustment for Coupling 452
What Radio Readers Want to Know 453
Insulating the Ground Connection in Radio Work 613 An Easily Made Self-Locking Device for Barn-
Doors 614
Converting a Plain Zinc-Gap into an Air Blast
Spark-Gap 62 I
Strengthening the Static Field of an Amplifier. . . , 622 Overcoming Troubles in a 200-Mcter Wave Outfit 623
How to Become a Wireless Operator 627
Employing Kites to Support an Aerial 630
A New Spark-Gap for Wireless Telephony 63 I
Making a Crystal Detector from Cheap Materials 633 Wireless Telegraph Stations in the West Indies . . 633 I ns'ilating and Decorative Enamel for Electro- Magnets 634
Best Wavelengths for Certain Distances 635
What Radio Readers Want to Know 636-637
Converting a Freight Car into a Wireless Station. 639
The Construction of a One-Mile Receiver 789
How to Become a Wireless Operator 789
Making an Inductance Switch for Radio Work. . . 796
What Radio Readers Want to Know 797
Simple Method of Remagnetizing Magnets 799
The Telephone Receiver for Wireless Apparatus. . 799 Experiments with Antennas of Varying Lengths. . 800 Making the Aeroplane Generate Its Own Power
for Wireless 842
Using a Tree as a Mast for a Wireless Station .... 871
Making an Emergency Aerial for Wireless 948
How to Become a Wireless Operator 949
Transformer Trouble in Radio Transmitting
Apparatus 954
Practicing the Code Without Using a Buzzer 955
How to Take Up the Slack on Your Aerial Wires. 955 Canada to Protect Her Parks with Radio Service. 955 Preventing Interference of Signals by Amplifying. 956 A New Direct-Current Transmitter in Radio
Communication 957
What Radio Readers Want to Know 958
RAILWAYS
End-Door Automobile Express Cars 7
Driving Railway Spikes with a Motor-Car 26
Hairpin Curves on a Mountain Trolley Line 48
Beautifying- Manhattan's Riverfront 86
Minute Men of the Rails 169
Boy's Road Wagon Is u Real Locomotive 183
An Auto Mountain Railway 207
A Western Railroad's Clay Locomotives 242
A Railroad Which Fights Its Own Fires 251
The Senators' Subway 328
A Locomotive that Burns Pulverized Coal 376
Feeling the Way 379
Railroad Treads for Motor-Trucks 391
Stopping Trains Automatically 433
Odd Uses for Railroad Cars 500-501
Solving New York's Freight Problem 546
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Ten Millions to Save Four Miles 553
A Danger Signal Which Compels Attention 572
Our First Armored Car 588
The Hose Is Mightier Than the Brush 688
A Motor-Wheel for the Railroad Velocipede 742
A Locomotive Side-Frame Which Weighs Nearly.
Seven Tons 829
A Wind- Deflecting Lookout Mask for Engineers. . 832
Daylight Lamp Signals 847
A Device for Adjusting the Ends of Steel Rails. . . 915 Transforming a Railroad Water-Tank Into a
Home for Two 919
SHIPS AND SHIP BUILDING
Protecting a Battleship with a Belt of Air 18
How a Steamer's Engine Room Is Ventilated .... 104
Charting the Dangers of the Deep 204
Coaling a Liner with An Elevator 206
The World's Largest Ships' Register 226
Pulverized Coal Burners on Our Modern Ocean
Steamships 230
A Damaged Lock Gate Repaired by I ts Own
Water 234
A Venetian Barge in Boston 258
A Guard for Mooring Ropes to Prevent Rats from
Landing 363
Tethering the Largest of the Super-Dreadnoughts 381 Milazzo — the Largest Coal Ship in the World. . . 392
Cooling a Ship's Laundry 477
Pocket-Flashlight Distress-Signals 520
Piping Oil to Ships at Sea 521
A Fog-Stick for Traffic on the Great Lakes 522
A Fleet of Indoor Battleships 578
Detecting Enemy Submarines from a Ship's Look-
Out 579
Preventing Ships from Rolling with Fly Wheels . . 592
The Thousand-Foot Battleship 670
A Novel Device for Generating Fresh Air in Sub- marines 681
Telegraphing Through the Ocean 711
Defending America with Motor Torpedo Boats. . . 721
Miniature Magnet-Propelled Ships 737
Discovering Contraband of War 752
An Endless-Chain Barge Loader 845
She Lies on Her Side— But They'll Raise Her 880
SPORTS AND PASTIMES
Doing Without the Caddy 12
Golfing at Home 13
Playing Baseball by Machine 57
The Five-Wheeled Velocipede 64
What Ho! The Jitney Yacht 83
A "Jackomobile" for Two 100
What Inventors Are Doing for the Fisherman . . . 105
Camp Fire Maxims ....T 115
Kite Making at Home — II 127
How to Make a Practical Gas-Range Lighter .... 156
Weightmobile Approaches Perpetual Motion 158
Leaping Horses That Are Unafraid 168
Another Baseball Game in Disguise I 74
An Air-Tight Compartment for Canoe Campers. . 184
Turning Your Racket Press Into a Camp Stool . . . 224
The Latest in Golf Clubs 246
"Canal Boats" Which Are Real Water-Shoes... 257
The First Bird House Ejthibit 260
Making a Bomb Thrower for Sham Battles 295
The Whistling Bicycle Wheel 297
How to Make a Toy Zeppelin 313
Ferreting out the Secrets of the Golf Ball 324
A Metal Disk Supplants the Golfer's Tee 324
Golfing by the Clock — a New Idea for Golf Courses 325
What Golfing Sometimes Does to the Feet 325
Making Your Head Behave While You Hit the Ball 325
A Paddleless Canoe Propelled by Feet and Hands 326
Mechanical Joys of Coney Island 394
Playing Checkers on the Lawn 398
Good-By to the Pin-Boys in the Bowling- Alley . . . 409
Battle Ball— a New Sport 420
Getting Ready for the Clay Birds 421
A Fascinating Old Sport in a New Dress 436
The Trench Marble Game and How It Is Played. . 455
Decoy Ducks That Quack and Swim 509
The Old Fondness for Cycling Is Coming Back. . . 514
Hunting the Mud Pigeon 530
Bucking a Wooden Football Line 554
Playing Ball with a Revolving Fan as a Target . . 568
Motoring on Rollcr-Skates 569
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