NEW TELEGRAM SYSTEM
TELEPHONE WIRES TO BE USED. Telegrams to places north of London will sOon :b'e sent on telephone wires. This is an outcome of the latest Post Office development, known as "voice frequency" working, which enables one telephone cable to be used as 18 telegraph channels. As a result telegraph wires will soon disappear and there will be one type of line ohly — telephone. The principle of "voice frequency" working "practically amounts to "wired wireless." Instead of the cables being used to carry direct current, alterhating current is. used at a number of frequencies, the lin'e being "tuned" to 18 .'different wave-lengths. The n'ext big set of liiles to come into use will be between London and Manchester. Two telephone cables will be taken over and usea as 3j) telegraph channels. The oid telegraph lines — (about 100— iwill be re-wired as telephone cables.
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Bibliographic details
Rotorua Morning Post, Volume 2, Issue 600, 3 August 1933, Page 2
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145NEW TELEGRAM SYSTEM Rotorua Morning Post, Volume 2, Issue 600, 3 August 1933, Page 2
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