The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 119
nd 4, i and 5, 2 and 4,2 and 5, 3 and 5. For six sections: i and 3, i and 4, i and 5, i and 6,2 and 4, 2 and 5, 2 and 6, 3 and 5, 3 and 6, 4 and 6. Where the number of sections exceeds this a special transfer switch isusually employed ; but this will be described in Chapter XVIII. The connections… … 8^o%pt Srriia^ Sprtpf^S y/atai fpJicator-SS draipf Sr„fc^S/>rxpg»S S-fotpf - Figure 91. circuit between sections i and 3, tag 21 goes to tag 21, and tag 23 to 23 ofthe other section. Similarly the ends of tags 47 and 48 are connected.The reason of this is obvious. Tags 47 and 48 are respectively…
Telephone · Postal service
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