Abstract
So rapid have been the advances made in radiotele-graphy and radio telephony that the author has found it necessary to rewrite much of the first edition of this useful book. The invention of the two-electrode thermionic valve by Prof. Fleming in 1904 made an entirely new departure in the radio art. The subsequent development of the hard three-electrode valve marks an equally important advance. With the exception of the crystal detector, all other types of detector for electric waves have now been made antiquated. As a generator of electric oscillations the valve has come to the front. As a relay or repeater in telephony also it is being very widely used. The author has added a new chapter on thermionic relays. A telephone line filter is described, and a clear account is given of carrier wave telephony applied to ordinary telephone lines. Speech has been transmitted perfectly from the Atlantic to the Pacific Ocean. It first passed by radio thirty miles over the sea, then 4000 miles overland by wire, and finally it passed thirty miles over sea again by radio. All the transmissions were effected by thermionic valves, no human agency being employed.
The Thermionic Valve and its Developments in Radio-Telegraphy and Telephony.
Prof.
J. A.
Fleming
By. Second edition, fully revised. Pp. xiii + 438. (London: The Wireless Press, Ltd.; New York: Wireless Press, Inc., 1924.) 15s.
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Thermionic Valves and Radio Communication. Nature 114, 413 (1924). https://doi.org/10.1038/114413a0
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DOI: https://doi.org/10.1038/114413a0