The Radio Amateurs Hand Book | Page 6

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

LIST OF ILLUSTRATIONS
A. Frederick Collins, Inventor of the Wireless Telephone, 1899.
Awarded Gold Medal for same, Alaska Yukon Pacific Exposition,

1909
Collins' Wireless Telephone Exhibited at the Madison Square Garden,
October, 1908
General Pershing "Listening-in"
The World's Largest Radio Receiving Station. Owned by the Radio
Corporation of America at Rocky Point near Port Jefferson, L. I.
First Wireless College in the World, at Tufts College, Mass
Alexander Graham Bell, Inventor of the Telephone, now an ardent
Radio Enthusiast
World's Largest Loud Speaker ever made. Installed in Lytle Park,
Cincinnati, Ohio, to permit President Harding's Address at Point
Pleasant, Ohio, during the Grant Centenary Celebration to be heard
within a radius of one square
United States Naval High Power Station, Arlington, Va. General view
of Power Room. At the left can be seen the Control Switchboards, and
overhead, the great 30 K.W. Arc Transmitter with Accessories
The Transformer and Tuner of the World's Largest Radio Station.
Owned by the Radio Corporation of America at Rocky Point near Port
Jefferson, L. I.
Broadcasting Government Reports by Wireless from Washington. This
shows Mr. Gale at work with his set in the Post Office Department
Wireless Receptor, the size of a Safety Match Box. A Youthful Genius
in the person of Kenneth R. Hinman, who is only twelve years old, has
made a Wireless Receiving Set that fits neatly into a Safety Match Box.
With this Instrument and a Pair of Ordinary Receivers, he is able to
catch not only Code Messages but the regular Broadcasting Programs
from Stations Twenty and Thirty Miles Distant
Wireless Set made into a Ring, designed by Alfred G. Rinehart, of

Elizabeth, New Jersey. This little Receptor is a Practical Set; it will
receive Messages, Concerts, etc., measures 1" by 5/8" by 7/8". An
ordinary Umbrella is used as an Aerial


CHAPTER I
HOW TO BEGIN WIRELESS
In writing this book it is taken for granted that you are: first, one of the
several hundred thousand persons in the United States