TELEGRAPH - LoveToKnow Article on TELEGRAPH
In the British Postal Telegraph system five sizes of iron wire are in general use, weighing respectively 200, 400, 450, 600 and 800 lb per statute mile, and ...... by the Wheatstone fast-speed apparatus, and especially on those in which a submarine cable is included, it Re at is found necessary to introduce repeaters half-way, ...
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cial's website is cial.org.uk