The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 173
m the cellsbefore they pass to the charging and controlling switches. In the case ofthe signalling leads the slight resistance inserted is not of such vital con-sequence. A fault at a switch section blows the small fuse on the fusetablet, but a fault between the fuse tablet and the cells blows the… … Figure 127. circuits on to a single set of batteries. The whole of the permanentcurrents are arranged precisely as described in the case of accumulatorworking, but as no fuse tablet is necessary the batteries are grouped uponthe battery tablet as shewn in Figure 127. Two sets of batteries are…
Telephone · Postal service
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