NEW TELEGRAPH SYSTEM
VOICE FREQUENCY IN NEW ZEALAND. 1 FIRST FIVE INSTALLATIONS. Before the end of the year the Post Office will complete the installation of the multi-channel voice-frequency system of telegraphy between Wellington and Christchurch, and Wellington and Blenheim. This modern development of communication which involves the use of alternating currents within the audible range enables as many as eighteen two-way machine-printing telegraph channels to be operated over a pair of wires while they are also being utilised at the same time for three long-distance telephone conversations. How this is possible was recently described in these columns. The important result to the Post Office is that its network of aerial lines can carry a considerable increase of traffic both for the telegraph and the telephone without further loading of the poles with additional cross-arms and wires.
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https://paperspast.natlib.govt.nz/newspapers/WAITA19381119.2.52
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Wairarapa Times-Age, 19 November 1938, Page 7
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137NEW TELEGRAPH SYSTEM Wairarapa Times-Age, 19 November 1938, Page 7
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