## WirelessOriginally published in 1931, this book was written to provide an account of wireless theory and practice for competent electrical engineers without knowledge of high-frequency phenomena. The text discusses numerous aspects of wireless telegraphy and telephony, incorporating information on key principles and direct engineering application. Illustrative figures and detailed notes are also included. This book will be of value to anyone with an interest in the development of wireless technologies, engineering and the history of science. |

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### Contents

Introduction | 1 |

Electromagnetic radiation | 11 |

Radiation from a vertical antenna | 28 |

Propagation of wireless waves | 35 |

2 Degradation of radiated energy | 41 |

SECTION PAGE | 46 |

5 Experimental knowledge of the Heaviside layer | 56 |

Oscillatory circuits | 63 |

Other retroactive oscillator circuits | 279 |

The triode telegraph transmitter | 289 |

Other types of triode oscillator | 295 |

Chapter X Generalised treatment of complex triode | 310 |

Case of 8 0 No anodegrid mutual inductance | 316 |

The grid rectiﬁer | 326 |

4 Closer analysis of the grid rectiﬁer 832 | 332 |

Load on the input circuit | 341 |

The wavemeter 744 | 74 |

Damped impressed | 83 |

Tight coupling | 89 |

The steady state in compound circuits | 99 |

Mechanical model of coupled oscillatory circuits | 105 |

The production of highfrequency currents | 107 |

Excitation by buzzer | 117 |

Highfrequency alternators | 132 |

The detection of highfrequency currents | 144 |

SECTION PAGE | 172 |

diodes | 185 |

Introduction of a third electrode | 192 |

Modern patterns of triodes | 204 |

Grid current | 212 |

The triode as ampliﬁer | 225 |

Analysis of ampliﬁer with mixed impedance | 231 |

Cascade ampliﬁers | 237 |

SECTION PAGE | 252 |

Strictly aperiodic ampliﬁers giving high ampliﬁcation | 260 |

Analysis of a usual circuit from ﬁrst principles | 267 |

Approach to linear performance | 347 |

SECTION PAGE | 355 |

The superheterodyne 862 | 362 |

Example of triode receiver | 370 |

Telegraphy and telephony compared 373 | 376 |

The modulated oscillation | 389 |

Distortions in the receiver 4 05 | 405 |

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Examples of telephone installations | 423 |

Antennas and antenna combinations | 432 |

Receiving antennas | 439 |

5 Loop antennas | 448 |

7 Two spaced antennas | 463 |

V Distribution of highfrequency current | 477 |

Proximity effect in wires | 487 |

Purereactance elements | 495 |

Bandpass ﬁlter | 503 |

3 The atmospheric as a continuous spectrum | 513 |

519 | |

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### Common terms and phrases

alternating alternating current ammeter amperes ampliﬁer amplitude anode battery anode circuit anode current anode potential antenna atmosphere Beverage antenna carrier-wave cathode characteristic coil component condenser constant coupling damping decrement detector difﬁculty effect efﬁciency electric ﬁeld electrons emission equation ﬁeld strength ﬁlament ﬁlter ﬁnd ﬁnite ﬁrst ﬁxed ﬂow ﬂuctuation ﬂux formula grid current grid potential grid rectiﬁer Heaviside layer heterodyne high-frequency impedance increase indeﬁnitely inductance inﬂuence input ionised kc/s loop magnetic ﬁeld microphone modulation mutual inductance natural frequency negative obtained oscillation oscillatory circuit output Plate practical produced propagation radiation resistance ratio reactance receiver rectiﬁer reﬂection retroaction self-oscillation sensibly shown in Fig shows shunting side-waves signiﬁcance sinoidal spark spark gap speciﬁed steady stray capacitance sufﬁciently telegraphy telephone telephony tetrode thermionic transmitter triode tube tungsten velocity vertical volts wavelength wire wireless wireless telegraphy zero