Silicon, percentage in earth, 11

Sodium chloride, in solution, 19

Sound, production of, 152

Speech, to transmit by radio, 230

Speed of light, 122

Standard cell, 58

Storage battery, 28, 30

Sulphuric acid, 22

Super-heterodyne, 242;
advantages of, 242

Telephone receiver, 130;
theory of, 131

Telephone transmitter, 142

Telephony, by wire, 253

Tickler coil, 182

Transcontinental telephone line, 261

Transmission, essential operations in, 230

Transmitter, Arlington, 233;
continuous wave, 94, 119;
for high power, 233

Transformer, 185;
step-up, 193

Tubes, connected in parallel, 234

Tuning, curve, 117;
sharp, 214;
with series condenser, 224

Undamped waves (see continuous waves), 86

Vacuum tube, 35, 40;
characteristics of, 67;
construction of, 205;
modulator, 239;
three-electrode, 41;
two-electrode, 42

Variometer, 108

Vibrating string, study of, 154

Vocal cords, 153

Voice frequencies, 163

Volt, definition of, 57;
measurement of, 61

Voltmeter, calibration of, 62;
construction of, 205

Watt, 235

Wave form, 182

Wave length, relation to frequency, 98, 122;
defined, 122

Wire, inductance of, 104

Wire, movement of electrons in, 14;
emission of electrons from, 37

Wire telephony, 253

Wired wireless, 255;
advantages of, 257

X-rays, 147

Zero coupling, 177

Zinc, electrode for battery, 23

End of the Project Gutenberg EBook of Letters of a Radio-Engineer to His Son, by
John Mills

*** END OF THIS PROJECT GUTENBERG EBOOK LETTERS--RADIO-ENGINEER TO SON ***

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