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" ... amperes. CODING OF WAVE LENGTHS. The great advantage of this set lies in the fact that any desired wave length from 675 to 2,220 meters can be sent out at will and if the wave length is changed after every word of a message, according to a prearranged... "
Radiotelegraphy, U. S. Signal Corps - Page 96
by Signal Office - 1914
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The Wireless Age, Volume 5

Radio - 1917 - 1082 pages
...counterpoise works best at about 1,000 meters, where the antenna hot-wire ammeter reads about 7^4 amperes. Coding of Wave Lengths The great advantage of this...wave length with any success. Hence, messages may sometimes be kept confidential even when sent in plain English. This will take considerable drill on...
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Radiotelegraphy

United States. Army. Signal Corps - Telegraph, Wireless - 1915 - 136 pages
...counterpoise works best at about 1,000 meters, where the antenna hot-wire ammeter reads about 1\ amperes. CODING OF WAVE LENGTHS. The great advantage of this...next with 2,100, the next with 1,400, etc. — it HhHH Protective devices FIG. 78. will be difficult for any eavesdropping operator who has not the wavelength...
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Radiotelegraphy: U.S. Signal Corps

United States. Army. Signal Corps - Telegraph, Wireless - 1917 - 140 pages
...counterpoise works best at about 1,000 meters, where the antenna hot-wire ammeter reads about 7J amperes. CODING OF WAVE LENGTHS. The great advantage of this...wave length with any success. Hence, messages may sometimes be kept confidential even when sent in plain English. This will take considerable drill on...
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Radiotelegraphy: U.S. Signal Corps. : Rev. October 1916

United States. Army. Signal Corps - Telegraph, Wireless - 1917 - 144 pages
...length is changed after every word of a message, according to a prearranged code of wave lengths—for example, the first word sent with 700 meters, the next with 2,100, the next with 1,400, etc.—it will be difficult for any eavesdropping operator who has not the wavelength code to follow...
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Military Signal Corps Manual

United States - 1918 - 596 pages
...counterpoise works best at about 1,000 meters, where the antenna hot-wire ammeter reads about 7'/.t amperes. CODING OF WAVE LENGTHS The great advantage of this...wave length with any success. Hence, messages may sometimes be kept confidential even when sent in plain English. This will take considerable drill on...
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