Abstract
IN an address before the London Students' Section of the Institution of Electrical Engineers on October 15, Dr. W. G. Radley, of the Post Office Research Station at Dollis Hill, spoke on Telecommunications of the future. He pointed out that in 1914, although wire telephony had been in use for about forty years and had become an important factor in the social and business life of urban communities, the loss in speech power during transmission imposed definite limits to long–distance conversations. These limits disappeared as a result of the general introduction of thermionic valve amplifiers. Later on, the longdistance circuits which became possible were made cheaper by the development of systems of carrier–current telephony, culminating in a standard system providing twelve speech channels over one pair of wires. A novel form of co–axial cable followed. This was capable of transmitting television or providing several hundred speech channels over two conductors. In the meantime, the transmission of speech by radio had made world–wide telephony possible. Each of these developments was the result of a long period of experimental work.
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Future of Telecommunications. Nature 148, 591 (1941). https://doi.org/10.1038/148591b0
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DOI: https://doi.org/10.1038/148591b0