The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 181
to put certainnumbers on to certain junctions. This class of system may be termedthe divided board system in contradistinction to the multiple system. The difference between the two systems is illustrated in Figure 131,where three subscribers each terminating upon three different boards areshewn.… … Figure 132. to each board, and thus A may be connected to B or C at the first boardwithout the services of another operator being necessary. The multiplesystem then consists in placing the whole of the subscribers within thereach of every operator. Each section of the multiple board is six feetsix…
Telephone · Postal service
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