File:Radio, miracle of the 20th century a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject (14756451382).jpg

Identifier: radiomiracleof2000drin (find matches)
Title: Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development
Year: 1922 (1920s)
Authors: Drinker, Frederick E. (from old catalog) Lewis, James G., (from old catalog) joint author
Subjects: Radio
Publisher: (Philadelphia, Printed by National publishing co.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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where the ground is moist, andextending a sufficient distance above the ground in orderthat the ground clamp may be fastened to it. Scrape therust or paint from the pipe before driving in the ground. N is a wire leading from the upper clip of the lightningswitch through the porcelain tube (0) to the receiving setbinding post marked i antenna. 0 is a porcelain tube of sufficient length to reachthrough the window casing or wall. This tube should bemounted in the casing or wall so that it slopes down to-ward the outside of the building. This is done to keepthe rain from following the tube through the wall to theinterior. Fig. 2 shows the radio receiving set installed in somepart of the house. MIRACLE OF THE AGE 155 P is the receiving set which is described in detail below. N is the wire leading from the antenna binding postof the receiving set through the porcelain tube of theupper clip of the lightning switch. This wire, as well asthe wire shown by Q, should be insulated and preferably
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flexible. A piece of ordinary lamp cord might be un-braided and serve for these two leads. Q is a piece of flexible wire leading from the receivingset binding post marked ground to a water pipe, heat-ing system or some other metallic conductor to ground,except M, Fig. 1. If there are no water pipes nor radia-tors in the room the wire should be run out of doors andconnected to a special ground below the window, which 156 RADIOTELEPHONY shall not be the same as the ground for the lightningswitch. It is essential that for the best operation of thereceiving set this ground be of the very best type. Ifthe soil near the house is dry it is necessary to drive oneor more pipes or rods sufficiently deep to encounter moistearth and connect the ground wire to the pipes or rods.This distance will ordinarily not exceed six feet. Whereclay soil is encountered this distance may be reduced tothree feet, while in sandy soil it may be increased to tenfeet. If some other metallic conductor, such as the c

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