The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 128
ed. The call wire occupies the same relative positionas the first two A circuit positive lead tags. Thus it will be seen how easyit is to trace the tags corresponding to any particular circuit. A single battery must be used to work the whole exchange, but the bat-tery leads to each section should… … Figure 98. which are blown in the event of a fault. This fuse indicates upon whatsection or transfer board the fault lies. In the case of transfer boards theA and B circuits are frequently divided into groups, so that the position ofthe fault may the more readily be ascertained. The top spring is…
Telephone · Postal service
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
