LIST OF FIGURES

[Fig. 1.]--Simple Receiving Set
[Fig. 2.]--Simple Transmitting Set
[(A) Fig. 3.]--Flat Top, or Horizontal Aerial
[(B) Fig. 3.]--Inclined Aerial
[(A) Fig. 4.]--Inverted L Aerial
[(B) Fig. 4.]--T Aerial
[Fig. 5.]--Material for a Simple Aerial Wire System
[(A) Fig. 6.]--Single Wire Aerial for Receiving
[(B) Fig. 6.]--Receiving Aerial with Spark Gap Lightning Arrester
[(C) Fig. 6.]--Aerial with Lightning Switch
[Fig. 7.]--Two-wire Aerial
[(A) Fig. 8.]--Part of a Good Aerial
[(B) Fig. 8.]--The Spreaders
[(A) Fig. 9.]--The Middle Spreader
[(B) Fig. 9.]--One End of Aerial Complete
[(C) Fig. 9.]--The Leading in Spreader
[(A) Fig. 10.]--Cross Section of Crystal Detector
[(B) Fig. 10.]--The Crystal Detector Complete
[(A) Fig. 11.]--Schematic Diagram of a Double Slide Tuning Coil
[(B) Fig. 11.]--Double Slide Tuning Coil Complete
[(A) Fig. 12.]--Schematic Diagram of a Loose Coupler
[(B) Fig. 12.]--Loose Coupler Complete
[(A) Fig. 13.]--How a Fixed Receiving Condenser is Built up
[(B) Fig. 13.]--The Fixed Condenser Complete
[(C) and (D) Fig. 13.]--Variable Rotary Condenser
[Fig. 14.]--Pair of Wireless Headphones
[(A) Fig. 15.]--Top View of Apparatus Layout for Receiving Set No. 1
[(B) Fig. 15.]--Wiring Diagram for Receiving Set No. 1
[(A) Fig. 16.]--Top View of Apparatus Layout for Receiving Set No. 2
[(B) Fig. 16.]--Wiring Diagram for Receiving Set No. 2
[Fig. 17.]--Adjusting the Receiving Set
[(A) and (B) Fig. 18.]--Types of Spark Coils for Set No. 1
[(C) Fig. 18.]--Wiring Diagram of Spark Coil
[Fig. 19.]--Other Parts for Transmitting Set No. 1
[(A) Fig. 20.]--Top View of Apparatus Layout for Sending Set No. 1
[(B) Fig. 20.]--Wiring of Diagram for Sending Set No. 1
[Fig. 21.]--Parts for Transmitting Set No. 2
[(A) Fig. 22.]--Top View of Apparatus Layout for Sending Set No. 2
[(B) Fig. 22.]--Wiring Diagram for Sending Set No. 2
[Fig. 23.]--Using a 110-volt Direct Current with an Alternating current Transformer
[Fig. 24.]--Principle of the Hot Wire Ammeter
[Fig. 25.]--Kinds of Aerial Switches
[Fig. 26.]--Wiring Diagram for a Complete Sending and Receiving Set No. 1
[Fig. 27.]--Wiring Diagram for Complete Sending and Receiving Set No. 2
[Fig. 28.]--Water Analogue for Electric Pressure
[Fig. 29.]--Water Analogues for Direct and Alternating Currents
[Fig. 30.]--How the Ammeter and Voltmeter are Used
[Fig. 31.]--Water Valve Analogue of Electric Resistance
[(A) and (B) Fig. 32.]--How an Electric Current is Changed into Magnetic Lines of Force and These into an Electric Current
[(C) and (D) Fig. 32.]--How an Electric Current Sets up a Magnetic Field
[Fig. 33.]--The Effect of Resistance on the Discharge of an Electric Current
[Fig. 34.]--Damped and Sustained Mechanical Vibrations
[Fig. 35.]--Damped and Sustained Electric Oscillations
[Fig. 36.]--Sound Wave and Electric Wave Tuned Senders and Receptors
[Fig. 37.]--Two Electrode Vacuum Tube Detectors
[Fig. 38.]--Three Electrode Vacuum Tube Detector and Battery Connections
[Fig. 39.]--A and B Batteries for Vacuum Tube Detectors
[Fig. 40.]--Rheostat for the A or Storage-battery Current
[(A) Fig. 41.]--Top View of Apparatus Layout for Vacuum Tube Detector Receiving Set
[(B) Fig. 41.]--Wiring Diagram of a Simple Vacuum Tube Receiving Set
[Fig. 42.]--Grid Leaks and How to Connect them Up
[Fig. 43.]--Crystal Detector Receiving Set with Vacuum Tube Amplifier (Resistance Coupled)
[(A) Fig. 44.]--Vacuum Tube Detector Receiving Set with One Step Amplifier (Resistance Coupled)
[(B) Fig. 44.]--Wiring Diagram for Using One A or Storage Battery with an Amplifier and a Detector Tube
[(A) Fig. 45.]--Wiring Diagram for Radio Frequency Transformer Amplifying Receiving Set
[(B) Fig. 45.]--Radio Frequency Transformer
[(A) Fig. 46.]--Audio Frequency Transformer
[(B) Fig. 46.]--Wiring Diagram for Audio Frequency Transformer Amplifying Receiving Set. (With Vacuum Tube Detector and Two Step Amplifier Tubes)
[(A) Fig. 47.]--Six Step Amplifier with Loop Aerial
[(B) Fig. 47.]--Efficient Regenerative Receiving Set (With Three Coil Loose Coupler Tuner)
[Fig. 48.]--Simple Regenerative Receiving Set (With Loose Coupler Tuner)
[(A) Fig. 49.]--Diagram of Three Coil Loose Coupler
[(B) Fig. 49.]--Three Coil Loose Coupler Tuner
[Fig. 50.]--Honeycomb Inductance Coil
[Fig. 51.]--The Use of the Potentiometer
[Fig. 52.]--Regenerative Audio Frequency Amplifier Receiving Set
[Fig. 53.]--How the Vario Coupler is Made and Works
[Fig. 54.]--How the Variometer is Made and Works
[Fig. 55.]--Short Wave Regenerative Receiving Set (One Variometer and Three Variable Condensers)
[Fig. 56.]--Short Wave Regenerative Receiving Set (Two Variometer and Two Variable Condensers)
[Fig. 57.]--Wiring Diagram Showing Fixed Loading Coils for Intermediate Wave Set
[Fig. 58.]--Wiring Digram of Intermediate Wave Receptor with One Vario Coupler and 12 Section Bank-wound Inductance Coil
[Fig. 59.]--Wiring Diagram Showing Long Wave Receptor with Vario Couplers and 8 Bank-wound Inductance Coils
[Fig. 60.]--Wiring Diagram of Long Wave Autodyne, or Self-heterodyne Receptor (Compare with Fig. 77)
[Fig. 61.]--Wiring Diagram of Long Wave Separate Heterodyne Receiving Set
[Fig. 62.]--Cross Section of Bell Telephone Receiver
[Fig. 63.]--Cross Section of Wireless Headphone
[Fig. 64.]--The Wireless Headphone
[Fig. 65.]--Arkay Loud Speaker
[Fig. 66.]--Amplitone Loud Speaker
[Fig. 67.]--Amplitron Loud Speaker
[Fig. 68.]--Magnavox Loud Speaker
[Fig. 69.]--Schematic Diagram of an Atom
[Fig. 70.]--Action of Two-electrode Vacuum Tube
[(A) and (B) Fig. 71.]--How a Two-electrode Tube Acts as Relay or a Detector
[(C) Fig. 71.]--Only the Positive Part of Oscillations Goes through the Tube
[(A) and (B) Fig. 72.]--How the Positive and Negative Voltages of the Oscillations Act on the Electrons
[(C) Fig. 72.]--How the Three-electrode Tube Acts as Detector and Amplifier
[(D) Fig. 72.]--How the Oscillations Control the Flow of the Battery Current through the Tube
[Fig. 73.]--How the Heterodyne Receptor Works
[Fig. 74.]--Separate Heterodyne Oscillator
[(A) Fig. 75.]--Apparatus for Experimental C. W. Telegraph Transmitter.
[(B) Fig. 75.]--Apparatus for Experimental C. W. Telegraph Transmitter.
[Fig. 76.]--Experimental C. W. Telegraph Transmitter
[Fig. 77.]--Apparatus of 100-mile C. W. Telegraph Transmitter
[Fig. 78.]--5- to 50-watt C. W. Telegraph Transmitter (with a Single Oscillation Tube)
[Fig. 79.]--200-mile C. W. Telegraph Transmitter (with Two Tubes in Parallel)
[Fig. 80.]--50-watt Oscillator Vacuum Tube
[Fig. 81.]--Alternating Current Power Transformer (for C. W. Telegraphy and Wireless Telephony)
[Fig. 82.]--Wiring Diagram for 200- to 500-mile C. W. Telegraph Transmitting Set. (With Alternating Current.)
[Fig. 83.]--Wiring Diagram for 500- to 1000-mile C. W. Telegraph Transmitter
[Fig. 84.]--Standard Microphone Transmitter
[Fig. 85.]--Wiring Diagram of Short Distance Wireless Telephone Set. (Microphone in Aerial Wire.)
[Fig. 86.]--Telephone Induction Coil (used with Microphone Transmitter).
[Fig. 87.]--Microphone Transformer Used with Microphone Transmitter
[Fig. 88.]--Magnetic Modulator Used with Microphone Transmitter
[(A) Fig. 89.]--Wiring Diagram of 25--to 50-mile Wireless Telephone. (Microphone Modulator Shunted Around Grid-leak Condenser)
[(B) Fig. 89.]--Microphone Modulator Connected in Aerial Wire
[Fig. 90.]--Wiring Diagram of 50- to 100-mile Wireless Telephone Transmitting Set
[Fig. 91.]--Plate and Grid Circuit Reactor
[Fig. 92.]--Filter Reactor for Smoothing Out Rectified Currents
[Fig. 93.]--100- to 200-mile Wireless Telephone Transmitter
[(A) and (B) Fig. 94.]--Operation of Vacuum Tube Oscillators
[(C) Fig. 94.]--How a Direct Current Sets up Oscillations
[Fig. 95.]--Positive Voltage Only Sets up Oscillations
[Fig. 96.]--Rasco Baby Crystal Detector
[Fig. 97.]--How the Tuning Coil is Made
[Fig. 98.]--Mesco loop-ohm Head Set
[Fig. 99.]--Schematic Layout of the $5.00 Receiving Set
[Fig. 100.]--Wiring Diagram for the $5.00 Receiving Set