The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 130
to the record table, where they repeat their demand. Having taken theirdemand, the Post Office operator gives instructions for their disconnectionby pulling forward a plug, which lights a little lamp placed by the side ofthe ticket wire which has been utilised. This is the Companys signal… … lK)=t^ Figure gg. circuit or loop passes from the short spring of a five-point switch-spring to the short spring of the Companys switch-spring, and from longspring to long spring. It will thus be seen that any subscriber connectedat the Companys end will be through to the Post Office. The Post…
Telephone · Postal service
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