An edition of Practical radio
(1922)
Practical radio
by Henry Smith Williams M.D. LL.D.
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Book Details
Table of Contents
CONTENTS
CHAPTERS
I A Wonderful Game for Boys 1- 32
The American Youth and the Radio Game, 1 — From the Mouths of Babes, 4 — The Simplest Radiophone Receiver, 8 — The Simplest Radiophone Receiver Analyzed, 14 — Make One for Yourself, 18— Youthful Miracle Workers, 24— The Achievement of "Feed-Back" Armstrong, 26 —Almost Everybody Will Have One, 30.
II Ethereal Messengers 33- 47
The Radio Waves Invade Our Homes, 33— All Matter Is Sponge-Like, 36 — The Ocean of Ether, 38— Our Point of Contact with the Ether, 41— Electromagnetic or Radio Waves, 44
III Hearing the Inaudible 49- 84
From Ether to Air, 50 — The Receiving Antenna, 52 — Installing the Aerial, 55— Grounding the Antenna, 60 — Protection against Lightning, 61 — Practical Details of Antenna Construction, 65 — The Tuning Mechanism, 70 — How to Make a Tuning Coil, 72 — The All-Important Detector, 75 — The Radio Telephone Receivers, 79 — Hooking Up the Outfit, 80— Instructions for Wiring, 81— Directions for Operating, 82.
IV Getting Good Results — and Better 85-128
Operating the Receiving Set, 85 — A Word About Hook-Ups, 87 — Improving the Tuning Apparatus, 92— Making a Loose-Coupler, 8 — Honey-Comb Coil and Spider Web, 104 — Another Type of Tuner, 105 — The Condenser, 106 — Making a Simple Condenser, 109 — Essential Parts of a Receiving Station, 113 — Details of Coupler Construction, 115 — Variable Condenser and Crystal Detector, 119 — Instructions for Assembling and Wiring, 120 — Directions for Operating, 125— Approximate Cost of Parts, 128.
V From Crystal to Triode 129-153
Dr. Lee De Forest, Inventor of the Audion, or Triode, 129 — Hearing with an Electric Light, 131 — Components of the Triode, 134 — Flow of Electrons Through the Triode, 139— The Grid Controls the Plate Current, 141 — Installing the Triode Detector, 143 — How to Manage Battery Wires, 148.
VI The Restless Electron and the Radio Hook-Up 154-178
The Hook-Up Likened to a Map. 154— The Electron as Wanderer, 157 — Much Haste and Little Speed, 161— Electron Movements in Radio Transmission, 163 — A Voyage in a Lamp, 166 — Harmonious Even Though Turbulent Voyagers, 172— Grid Condenser and Grid Leak, 173 — A Retrospect View, 176.
VII The Regenerative and Ampufying Radio Receiver 179-204
The "Feed-Back" Circuit with Tickler Coil, 180— Other Methods of Regeneration, 184— Adding Amplifying Triodes, 190 — The Wizardry of the Triode, 193 — The Characteristic Curve of the Triode, 197— The Heterodyne or "Beat" Effect, 202.
VIII Hints About Improved Aerials 205-226
Some General Considerations, 205 — Substitute and Makeshift Aerials, 208 — The Loop Aerial, 211—The Radio Compass, 216— The Loop Aerial on Airships, 220 — The Loop and "Static," 221— The Loop Aerial for E very-Day Use, 223.
IX Radio-Frequency Amplification and Super-Regeneration 227-272
Sensitiveness of the Triode, 231 — Radio-Frequency Amplification, 232 — Amateur Transatlantic Radio, 235 — The Super-Heterodyne Method, 241 — Amplification Without Distortion, 244 — Million-Fold Amplification, 246— A Single-Tube Amplifier, 250 — Super-Regeneration, 252 — Analysis of the Super-Regenerative Circuit, 255— Rolls-Royce versus Flivver, 263 — High-Frequency Complications, 266 — Theoretical Considerations, 268— Reflecting and Directing Radio Waves, 269.
X Sending Radio Messages 273-304
Some General Principles, 275 — The Transmitting Antenna, 278 — Wire-Length and Wave-Length, 279 — The Electrical Current and Radio Resistance, 281 — The Matter of Inductance, 286 —The Question of "Capacity," 290— The Electromagnetic Combination, 292 — The Practical Electron Tube Transmitter, 294 — Details of a Powerful Amateur Station, 296— Other Transatlantic Transmitting Stations, 298— Transmission with Triode and Fleming Valve, 301— From Novice to Amateur, 303.
XI "Wired Wireless" 305-332
Not Radically Different from Receiving, 305 — How the Message Travels, 308 — Later Experiments, 311— The "Super-Phone," 317— Line Radio to and from Moving Trains, 321 — Direct Radio from Trains, 323.
XII Radio Control op Distant Apparatus 333-351
Mr. E. P. Glavin's Radio Car, 333— Radio- Directed Watercraft, 340 — Sending Pictures by Radio, 342— Prof. Kron's Newest Method, 347.
XIII The Advanced Amateur and His Problems 352-380
The Army of Young Amateurs, 352 — Secretary Hoover's Conference, 355— The New Army of Amateurs, 358 — Spanning the Atlantic, 359— The Successful Transatlantic Stations, 365— Some Open Problems, 366 — Other Long Distance Records, 370 — Looking Forward, 371 — Midget Receiving Outfits, 373— Portable Sets of the Future, 378.
XIV Radio as a Public Utility 381-397
Radio on a Kansas Farm, 381 — Speeches for the Folks Back Home, 383— The General Significance of Broadcasting, 386— An Expert's Opinion about Broadcasting, 389 — A College Course by Radio, 391 — Broadcasting Restrictions, 394.
ILLUSTRATIONS
A Wonderful Game for Boys Frontispiece
A Boy Who Knows the Radio Game 3
A Critical Listener 6
James Leo McLaughlin and His Prize Outfit 9
Diagrammatic View of the Prize Set 12
Essentials of the Radio-Receiving Apparatus and Their Symbols 15
Diagram or Hook-up of the Simplest Radio-Receiving Apparatus' 17
Dorothea and Alice Hanna 19
Edwin Amman and His Miniature Radio Receiver 20
Wireless on the Parasol in Paris 21
A Portable Receiver Requiring an Antenna Wire 23
Guglielmo Marconi 24
The Original Armstrong Regenerative Circuit 25
"Feed-Back" Armstrong 26
A Very Young Radio Expert 27
The Armstrong Super-Regenerative Receiver 29
Radio in the Home 34
Conventional Diagram of Radio Waves in the Ether 35
An Antenna System 37
A Well-Made Amateur Radio Outfit 39
Photographs of an Antenna System at Night 40
A Contrast in Electron Tubes, or Triodes 42
An Elaborate System of Antennae 43
Amateurs Installing a Radio Receiving Outfit in an Apartment 45
Where the WJZ Concerts Are Sent into the Air 46
A Cage Antenna, with Cage Lead-in 47
A Simple Radio-Receiving Outfit 51
A Clothes Line Aerial 53
Adjusting the Antenna Wire 54
Young Amateurs Putting Up an Antenna 56
Repairing the Antenna 57
A Somewhat Elaborate "T" Antenna 58
A Four-Strand Antenna of Inverted "L" Type 59
Details of Adjustment of Lead-in Wire from Antenna 61
Protection from Lightning 62
Lightning Switch 62
Details of Wiring of Antenna System with Particular Reference to Lightning Protection 63
An Inverted "L" Antenna Adjusted between a Tree and the Window Frame 64
An Inverted "L" Antenna Adjusted between Two Buildings 66
A Simple Tuning Coil or Inductance 70
Outline Drawing of the Simple Crystal-Detector Receiving Set 73
The Crystal Detector 78
The Mounting of a Simple Crystal-Detector Set 81
Schematic Diagram or Hook-Up of Simple Crystal-Detector Receiving Set 91
The Loose-Coupler and Its Symbol 93
Inductance Illustrated with a Loose-Coupler 95
The Vario-Coupler 96
The Variometer and Its Symbol 97
Spider Web Coil 98
A Receiving Set with Honeycomb Coil 99
Familiar Type of Variometer 103
Honeycomb Coils Detached 105
The Variable Condenser 107
Fixed Condenser and Its Symbol 108
Hook-Up with Loose Coupler and Variable Condenser 112
Loose-Coupler with Details of Construction 116
Details of Construction of Loose-Coupler 117
Semi-Diagrammatic Presentation of the Loose-Coupler Set, with Variable Condenser 121
The Loose-Coupler Receiving Set Ready for Operation 126
Dr. Lee De Forest 130
Various Types of Triodes 132
The Components of the Triode 134
The Storage Battery and Its Symbol 136
The "B" Battery and Its Symbol 138
Simple Triode Detector Hook-Up 140
The Flow of Electrons in the Triode 141
Triode Detector Hook-Up 147
Another Simple Triode Detector Hook-Up 149
A Complete Set of Symbols 152
Flow of Electrons in the Circuit of a Simple Crystal-Detector Radio-Receiver 156
Flow of Electrons in a Crystal-Detector Receiver with Loose-Coupler and By-Pass Phone Condenser 159
Flow of Electrons in the Circuits of a Triode Receiver 164
Flow of Electrons in the Circuits of a Triode-Detector Receiving Apparatus with "Feed-Back" Arrangement 165
Grid-Condenser and Grid-Leak Presented Pictorially and Symbolically 174
Flow of Electrons in the Circuits of a Triode-Detector Receiver with Grid-Condenser as Grid-Leak 175
Feed-Back Circuit with Tickler Coil 180
Regenerative Circuit with Honeycomb Coils 181
Another Type of Inductive Regenerative Circuit 183
Capacitive Feed-Back Circuit 184
Another Type of Capacitive Feed-Back 185
A "Standard" Regenerative Circuit 186
A Non-Regenerative Circuit Using a Potentiometer 187
Potentiometer and Rheostat 188
The Ultraudion Regenerative Circuit 189
Regenerative Circuit with Two-Stages of Audio-Frequency Amplification 191
Detector and Two-Step Audio-Frequency Amplifier 192
Jacks of Various Types, and Plug Shown in Diagrammatic Section 195
Showing How the Plug Inserted into the Jack Establishes Desired Circuits 196
The Characteristic Curve of the Triode 197
The Characteristic Curve of the Triode 199
Rectification of Modulated Current in the Triode 200
A Modern Radio Receiver on Shipboard 203
Testing the Antenna 207
Boys Using an Old Windmill for an Antenna Support 208
Circuit of a Receiving Set without Antenna 209
Using a Metal Clothesline 210
A Portable Antenna 212
Loop Aerials Used by the U. S. Signal Corps 213
A Gigantic Loop Aerial with Derrick Mounting 215
The Heart of a Radio Compass 217
Diagram of Receiving Apparatus with Loop Aerial for Direction Finder 218
The Marconi Radio Compass in Use 219
A Portable Direction-Finder 220
A Net that will Catch Mosquitoes or Radio Messages 222
A Self-Contained Radio Receiving Apparatus 224
Dr. Miller Operating His New Amplifier 225
Receiver with One-Step of Radio-Frequency Amplification 228
A Compact Amplifier in Portable Case 230
Interior View of the Compact Amplifier 230
Mr. Leo. J. Wallenstein, of the Radio Guild, New York, Testing an Amplifier with Loop Aerial 233
Circuit Diagram of Radio-Receiver with Two Steps of Radio-Frequency Amplification and Detector 236
Paul F. Godley (at Left) and Jack Binns 238
Circuit Diagram of the Armstrong Super-Heterodyne Receiver Used by Paul F. Godley in the Transatlantic Test 240
Slightly Different Type of Armstrong Super-Heterodyne Receiver 243
Making an Experimental Amplifying Radio Receiver 245
Hook-Up of an Amplifying Outfit with Two Steps of Radio-Frequency Amplification and Three Steps of Audio Frequency 249
Regenerative Circuit for Simultaneous Amplifying and Rectifying 250
Combination of Radio- and Audio-Frequency Amplification, with Detection, in One Tube 251
Major Armstrong's Super-Regenerative Receiver with Three Tubes 253
One of the Armstrong Super-Regenerative Circuits 255
Various Methods by which Major Armstrong Obtained Super-Regeneration 257
View from Above of an Armstrong Super-Regenerative Receiver, with Three Tubes, Made by Kenneth Harkness, of the Radio Guild, New Work 259
Another View of the Same Super-Regenerative Apparatus 259
Exterior View of Armstrong Super-Regenerative Receiver Made by Mr. Kenneth Harkness, of the Radio Guild 260
Hook-Up of One of the Armstrong Super-Regenerative Circuits Used by Mr. Kenneth Harkness, of the Radio Guild, in Building a Very Successful Receiver 264
Senator Guglielrao Marconi 269
An Apparatus for Reflecting Radio Waves 271
An Amateur Transmitting Outfit 277
Owners and Operators of the Amateur Station 1 BCG 283
Interior View of Station 1 BCG 285
The Most Powerful Valve Station 295
Circuit Diagram or Hook-Up of an Amateur Transmitting Outfit 297
Outlined Description of the Successful Transatlantic Stations 300
Major General Geo. O. Squier Testing His Wired Wireless Method 306
Major General Squier (at Left) Testing the Wired Wireless System 318
Radio from a Moving Train 325
A Train Equipped for Radio Work 327
The Lightning Plug Aerial 329
Mr. Glavin's Radio Car 335
Details of Construction of the Glavin Radio Car 336
The Radio Controlled Boat of Mr. John Hays Hammond, Jr 341
Apparatus for Transmitting Pictures by Radio 345
A "Close-Up" of the Apparatus for Transmitting Pictures by Radio 346
Professor Alfred Korn's Apparatus for Sending Pictures by Radio 348
A Picture Sent by Radio Code 349
Secretary Herbert E. Hoover Using a Radio Receiver 355
Senator Marconi and His Radio Set Aboard His Yacht 360
Marconi's Floating Laboratory, The Elettra 367
A Radio-Receiving Set in a Safety Razor Box 374
Details of Construction of a Miniature Set 375
A Radio-Receiving Set in a Watch Case 377
Another View of the Watch Case Radio-Receiving Set 379
The Only Woman-Member of Congress Appeals to Voters by Radio 385
Members of the Radio Faculty of Tufts College, Mass 392
Sending Government Statements by Radio from Washington 395
Mr. W. S. Houskeeper with his 100-Kilowatt Triode 396
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| May 18, 2020 | Edited by CoverBot | Added new cover |
| March 26, 2016 | Edited by ww2archive | added ia link |
| March 26, 2016 | Edited by ww2archive | added toc |
| August 12, 2010 | Edited by WorkBot | merge works |
| April 1, 2008 | Created by an anonymous user | Imported from Scriblio MARC record |