CHAPTER

I. HOW TO BEGIN WIRELESS

Kinds of Wireless Systems--Parts of a Wireless System--The Easiest Way to Start--About Aerial Wire Systems--About the Receiving Apparatus--About Transmitting Stations--Kinds of Transmitters--The Spark Gap Wireless Telegraph Transmitter--The Vacuum Table Telegraph Transmitter--The Wireless Telephone Transmitter.

II. PUTTING UP YOUR AERIAL

Kinds of Aerial Wire Systems--How to Put Up a Cheap Receiving Aerial--A Two-wire Aerial--Connecting in the Ground--How to Put up a Good Aerial--An Inexpensive Good Aerial--The Best Aerial That Can be Made--Assembling the Aerial--Making a Good Ground.

III. SIMPLE TELEGRAPH AND TELEPHONE RECEIVING SETS

Assembled Wireless Receiving Sets--Assembling Your Own Receiving Set--The Crystal Detector--The Tuning Coil--The Loose Coupled Tuning Coil--Fixed and Variable Condensers--About Telephone Receivers-- Connecting Up the Parts--Receiving Set No. 2--Adjusting the No. 1 Set--The Tuning Coil--Adjusting the No. 2 Set.

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

Damped and Sustained Mechanical Vibrations--Damped and Sustained Oscillations--About Mechanical Tuning--About Electric Tuning.

VIII. A SIMPLE VACUUM TUBE DETECTOR RECEIVING SET

Assembled Vacuum Tube Receiving Set--A Simple Vacuum Tube Receiving Set--The Vacuum Tube Detector--Three Electrode Vacuum Tube Detector--The Dry Cell and Storage Batteries--The Filament Rheostat--Assembling the Parts--Connecting Up the Parts--Adjusting the Vacuum Tube Detector Receiving Set.

IX. VACUUM TUBE AMPLIFIER RECEIVING SETS

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

A Short Wave Regenerative Receiver, with One Variometer and Three Variable Condensers--The Variocoupler--The Variometer--Connecting Up the Parts--Short Wave Regenerative Receiver with Two Variometers and Two Variable Condensers--The Parts and How to Connect Them Up.

XII. INTERMEDIATE AND LONG 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.

XIII. HETERODYNE OR BEAT LONG WAVE TELEGRAPH RECEIVING SET

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.

XVI. CONTINUOUS WAVE TELEGRAPH TRANSMITTING SETS WITH DIRECT CURRENT

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.

XVII. CONTINUOUS WAVE TELEGRAPH TRANSMITTING SETS WITH ALTERNATING CURRENT

A 100-mile C. W. Telegraph Transmitting Set--The Apparatus Required--The Choke Coils--The Milli-ammeter--The A. C. Power Transformer--Connecting Up the Apparatus--A 200- to 500-mile C. W. Telegraph Transmitting Set-A 500- to 1000-mile C. W. Telegraph Transmitting Set--The Apparatus Required--The Alternating Current Power Transformer-Connecting Up the Apparatus.

XVIII. WIRELESS TELEPHONE TRANSMITTING SETS WITH DIRECT AND ALTERNATING CURRENTS

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

The Operation of the Vacuum Tube Oscillator--The Operation of C. W. Telegraph Transmitters with Direct Current--Short Distance C. W. Transmitter--The Operation of the Key Circuit--The Operation of C. W. Telegraph Transmitting with Direct Current--The Operation of C. W. Telegraph Transmitters with Alternating Current--With a Single Oscillator Tube--Heating the Filament with Alternating Current--The Operation of C. W. Telegraph Transmitters with Alternating Current-- With Two Oscillator Tubes--The Operation of Wireless Telephone Transmitters with Direct Current--Short Distance Transmitter--The Microphone Transmitter--The Operation of Wireless Telephone Transmitters with Direct Current--Long Distance Transmitters--The Operation of Microphone Modulators--The Induction Coil--The Microphone Transformer--The Magnetic Modulator--Operation of the Vacuum Tube as a Modulator--The Operation of Wireless Telephone Transmitters with Alternating Current--The Operation of Rectifier Vacuum Tubes--The Operation of Reactors and Condensers.

XX. HOW TO MAKE A RECEIVING SET FOR $5.00 OR LESS.

The Crystal Detector--The Tuning Coil--The Headphone--How to Mount the Parts--The Condenser--How to Connect Up the Receptor.

APPENDIX

Useful Information--Glossary--Wireless Don'ts.