Letters of a Radio-Engineer to His Son

John Stuart Mill · en
Inducto-meter, 109

    Input circuit, 187

    Interference, 249

    Internal resistance, 191

    Ion, definition of, 19;
      positive and negative, 20, 21

    Ionization, 20

    Larynx, 153

    Laws of attraction, 204

    Loading coil, 224

    Loop antenna, 198

    Magnet, pole of, 203;
      of soft iron, 205;
      of steel, 205

    Magnetism, 202

    Matter, constitution of, 5

    Megohm, 172

    Microfarad, 104

    Mil-ampere, 71

    Mil-henry, 83

    Modulation, 145, 230, 237, 239

    Molecule, kinds of, 6;
      motion of, 35

    [Greek: mu], 190

    Multiplex telegraphy, 258;
      telephony, 258

    Mutual inductance, 109;
      variation of, 110

    Natural frequency, 161

    Nitrogen, 10

    Nucleus of atom, 10, 12

    Ohm, defined, 64

    Organ pipe, 160

    Oscillations, 87;
      damped, 114;
      to start, 114;
      intensity of, 236;
      natural frequency of, 117

    Output circuit, 187

    Overtones, 159

    Oxygen, percentage in air, 10

    Phase, 180

    Plate, of an audion, 41

    Plunger type of instrument, 205

    Polarity of a coil, 204

    Power, defined, 234;
      electrical unit of, 235

    Proton, properties of, 4

    Radio current, modulation of, 145

    Radio-frequency  amplification, 243;
      limitations, 243

    Radio-frequency amplifier, 186, 198

    Radio station connected to land line, 254

    Rating of tubes, 235

    Reception, essential operations in, 235

    Regenerative circuit, 176;
      frequency of, 179

    Repeater stations, 261

    Resistance, measurement of, 64;
      non-inductive, 103;
      square, 251

    Resonance, 161

    Resonance curve, 117

    Retard coils, 210

    Salt, atomic construction of, 17;
      crystal structure, 147;
      molecule in solution, 19;
      percentage in sea water, 11

    Saturation, 38

    Sea water, atomic constitution of, 11

    Self-inductance, 83;
      unit of, 83

    Side bands, 248;
      relation to wave lengths, 249

    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