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)