The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 118
icult and expensive.To take a case in point, a certain office at the time of the transfer hadonly some twelve or thirteen trunks ; but here C sections were fitted, andthe wisdom of this policy is shewn by the fact that an additional sectionhas recently been fixed. In another case the number of… … T»«» TO RKMAtttina fow aPAiNaa auTTOM a Figure go. The chief point of difference between a B section and a C section lies inthe transfer circuit provision; indicators and switch-springs, for ten transfercircuits being fitted instead of two, as in the B sections. These are fitted infour strips. The…
Telephone · Postal service
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