Abstract
GEORGE H. GRAY, writing in Electrical Communication (20, No. 4 ; 1942) gives a brief historical review of the progress achieved in telephone wire transmission systems since the early days of the telephone, folio-wed by a discussion of the important economic implications of the newer broad band systems, the 12-channel carrier and coaxial cable. The review is divided into four periods. Plant additions permitted advances during each period in at least three of the following respects : conversation distance, transmission channels obtainable from a pair of conductors, frequency band transmitted and, hence, improved quality and naturalness of conversation, and reliability of service.
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EVOLUTION OF WIRE TELEPHONY. Nature 151, 227–229 (1943). https://doi.org/10.1038/151227a0
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DOI: https://doi.org/10.1038/151227a0