IV Simple Telegraph Sending Sets
A Cheap Transmitting Set (No. 1)—The Spark Coil—The Battery—The Telegraph Key—The Spark Gap—The Tuning Coil—The High-tension Condenser—A Better Transmitting Set (No. 2)—The Alternating Current Transformer—The Wireless Key—The Spark Gap—The High-tension Condenser—The Oscillation Transformer—Connecting Up the Apparatus—For Direct Current—How to Adjust Your Transmitter. Turning With a Hot Wire Ammeter—To Send Out a 200-meter Wave Length—The Use of the Aerial Switch—Aerial Switch for a Complete Sending and Receiving Set—Connecting in the Lightning Switch.
V. ELECTRICITY SIMPLY EXPLAINED
Electricity at Rest and in Motion—The Electric Current and its Circuit—Current and the Ampere—Resistance and the Ohm—What Ohm’s Law Is—What the Watt and Kilowatt Are—Electromagnetic Induction—Mutual Induction—High-frequency Currents—Constants of an Oscillation Circuit—What Capacitance Is—What Inductance Is—What Resistance Is—The Effect of Capacitance.
VI. HOW THE TRANSMITTING AND RECEIVING SETS WORK
How Transmitting Set No. 1 Works—The Battery and Spark Coil Circuit—Changing the Primary Spark Coil Current Into Secondary Currents—What Ratio of Transformation Means—The Secondary Spark Coil Circuit—The Closed Oscillation Circuit—How Transmitting Set No. 2 Works-With Alternating Current—With Direct Current—The Rotary Spark Gap—The Quenched Spark Gap—The Oscillation Transformer—How Receiving Set No. 1 Works—How Receiving Set No. 2 Works.
VII. MECHANICAL AND ELECTRICAL TUNING
A Grid Leak Amplifier Receiving Set. With Crystal Detector—The Fixed Resistance Unit, or Grid Leak—Assembling the Parts for a Crystal Detector Set—Connecting up the Parts for a Crystal Detector—A Grid Leak Amplifying Receiving Set With Vacuum Tube Detector—A Radio Frequency Transformer Amplifying Receiving Set—An Audio Frequency Transformer Amplifying Receiving Set—A Six Step Amplifier Receiving Set with a Loop Aerial—How to Prevent Howling.
X. REGENERATIVE AMPLIFICATION RECEIVING SETS
The Simplest Type of Regenerative Receiving Set—With Loose Coupled Tuning Coil—Connecting Up the Parts—An Efficient Regenerative Receiving Set. With Three Coil Loose Coupler—The A Battery Potentiometer—The Parts and How to Connect Them Up—A Regenerative Audio Frequency Amplifier—The Parts and How to Connect Them Up.
XI. SHORT WAVE REGENERATIVE RECEIVING SETS
Intermediate Wave Receiving Sets—Intermediate Wave Set With Loading Coils—The Parts and How to Connect Them Up—An Intermediate Wave Set with Variocoupler Inductance Coils—The Parts and How to Connect Them Up—A Long Wave Receiving Set—The Parts and How to Connect Them Up.
What the Heterodyne or Beat Method Is—The Autodyne or Self-heterodyne Long Wave Receiving Set—The Parts and Connections of an Autodyne or Self-heterodyne, Receiving Set—The Separate Heterodyne Long Wave Receiving Set—The Parts and Connections of a Separate Heterodyne Long Wave Receiving Set.
XIV. HEADPHONES AND LOUD SPEAKERS
Wireless Headphones—How a Bell Telephone Receiver is Made—How a Wireless Headphone is Made—About Resistance, Turns of Wire and Sensitivity of Headphones—The Impedance of Headphones—How the Headphones Work—About Loud Speakers—The Simplest Type of Loud Speaker—Another Simple Kind of Loud Speaker—A Third Kind of Simple Loud Speaker—A Super Loud Speaker.
XV. OPERATION OF VACUUM TUBE RECEPTORS
What is Meant by Ionization—How Electrons are Separated from Atoms—Action of the Two Electrode Vacuum Tube—How the Two Electrode Tube Acts as a Detector—How the Three Electrode Tube Acts as a Detector—How the Vacuum Tube Acts as an Amplifier—The Operation of a Simple Vacuum Tube Receiving Set—Operation of a Regenerative Vacuum Tube Receiving Set—Operation of Autodyne and Heterodyne Receiving Sets—The Autodyne, or Self-Heterodyne Receiving Set—The Separate Heterodyne Receiving Set.
Sources of Current for Telegraph Transmitting Sets—An Experimental Continuous Wave Telegraph Transmitter—The Apparatus You Need—The Tuning Coil—The Condensers—The Aerial Ammeter—The Buzzer and Dry Cell—The Telegraph Key—The Vacuum Tube Oscillator—The Storage Battery—The Battery Rheostat—The Oscillation Choke Coil—Transmitter Connectors—The Panel Cutout—Connecting Up the Transmitting Apparatus—A 100-mile C. W. Telegraph Transmitter—The Apparatus You Need—The Tuning Coil—The Aerial Condenser—The Aerial Ammeter—The Grid and Blocking Condensers—The Key Circuit Apparatus—The 5 Watt Oscillator Vacuum Tube—The Storage Battery and Rheostat—The Filament Voltmeter—The Oscillation Choke Coil—The Motor-generator Set—The Panel Cut-out—The Protective Condenser—Connecting Up the Transmitting Apparatus—A 200-mile C. W. Telegraph Transmitter—A 500-mile C. W. Telegraph Transmitter—The Apparatus and Connections— The 50-watt Vacuum Tube Oscillator—The Aerial Ammeter—The Grid Leak Resistance—The Oscillation Choke Coil—The Filament Rheostat—The Filament Storage Battery—The Protective Condenser—The Motor-generator—A 1000-mile C. W. Telegraph Transmitter.
A Short Distance Wireless Telephone Transmitting Set—With 110-volt Direct Lighting Current—The Apparatus You Need—The Microphone Transmitter—Connecting Up the Apparatus—A 25- to 50-mile Wireless Telephone Transmitter—With Direct Current Motor Generator—The Apparatus You Need—The Telephone Induction Coil—The Microphone Transformer—The Magnetic Modulator—How the Apparatus is Connected Up—A 50- to 100-mile Wireless Telephone Transmitter—With Direct Current Motor Generator—The Oscillation Choke Coil—The Plate and Grid Circuit Reactance Coils—Connecting up the Apparatus—A 100- to 200-mile Wireless Telephone Transmitter—With Direct Current Motor Generator—A 50- to 100-mile Wireless Telephone Transmitting Set—With 100-volt Alternating Current—The Apparatus You Need—The Vacuum Tube Rectifier—The Filter Condensers—The Filter Reactance Coil— Connecting Up the Apparatus—A 100- to 200-mile Wireless Telephone Transmitting Set—With 110-volt Alternating Current—Apparatus Required.
XIX. THE OPERATION OF VACUUM TUBE TRANSMITTERS