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TABLE OF CONTENTS
CHAPTER I
Introductory: The Principles of Wireless Transmission and
Reception: Ether; Electromagnetic Waves; How Waves
Are Created; High-frequency Oscillations; Transmitting
and Receiving Apparatus
PAGES
I-II
CHAPTER II
The Means for Radiating and Intercepting Electric Waves;
The Effect of Intervening Country Upon Electric Waves;
Effects of Locality; "Static"; Lightning and What It Is;
Aerial Masts; Types of Aerials; Directive Action of
Aerials; Insulation of the Aerial; Earth Connections 12-26
CHAPTER III
The Transmitting Apparatus; Current Supply; Magnetic In-
duction; Magnetic Fields; The Induction Coil: The In-
terrupter; Electrolytic Interrupters; Open Core Trans-
formers; Closed Core Transformers; Direct Current; Al-
ternating Current; Oscillation Condensers; The Helix;
Spark Gaps; Rotary Gaps; Quenched Gaps; Aerial
Switches; Anchor Gaps; Keys
27-47
CHAPTER IV
The Receiving Apparatus; The Detector; Telephone Receiv- ers; How Electric Waves Affect the Receiving Apparatus;
Perikon Detector; Silicon Detector; Pyron Detector;
Carborundum Detector; Galena Detector; Molybdenite
Detector; The Potentiometer; The Tuning Coil; What
Tuning Accomplishes; How Undesirable Messages Are Ex-
cluded: The Loading Coil; The Fixed Condenser; Varia-
ble Condensers; The Purpose of the Condenser
48-69
CHAPTER V
Tuning and Coupling; How Tuning Is Accomplished; The
Results of Tuning; The Effects of Coupling; Inductive
Helixes; The Loose Coupler; The Hot Wire Ammeter;
Directive Wireless Telegraphy; The Braun System; Bel-
lini and Tosi Method
70-82
CHAPTER VI
The Dignity of Wireless Telegraphy; Its Applications and
Service; Wireless Telegraphy in Warfare; Wireless in the
Army; Wireless in the Navy; The Wireless Telegraph
Automobile; Wireless on an Airship; Wireless Telegraphy
as an Aid to Press Work; The Wireless Codes; How a
Message Is Transmitted and Received; The Breaking-
in System
CHAPTER VII
83-104
The Ear; How We Hear; Sound; Sound Waves; The Nature
of Sound; Speech; The Larynx and Vocal Chords; The
Structure of Speech; Manometric Flames
105-113
CHAPTER VIII
The Telephone; The Telephone Transmitter; The Telephone
Receiver; The Photophone; Selenium Cells; The Thermo-
phone; The Electric Arc; The Speaking Arc; Wireless
Telephony by Means of a Beam of Light.
114-123
CHAPTER IX
The Wireless Telephone; The Difficulties of Wireless Teleph-
ony; A Simple Wireless Telephone; The Effects of
Speech Upon Wireless Telephone Apparatus: The Re-
quirements of Wireless Telephone Apparatus; The Pro-
duction of Undamped Electrical Oscillations; The Poul-
sen Arc; Wireless Telephone Apparatus; The Majorana
Transmitter; The Receiving Apparatus; The Audion;
Transmission of Wireless Telephone Messages
124-136
CHAPTER X
Remarks; Maxwell's Theory; Hertz's Discovery; Electromag-
netic Waves; The Position of Wireless Telegraphy in the
World To-day; The Field for Wireless Telephony; The
Status of the "Amateur"; Wireless of the Future; The
Transmission of Power by Wireless .
137-148