The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 120
on of the apparatus is indicated in Figure 91. It will beseen that the space for Post Office subscribers is reduced from 10 to 5, asoperators cannot attend to Post Office renters in addition to trunks ; and,indeed, at all the larger offices a separate switch is provided for them.The transfer… … ?ir,UFE 92 A strip of five-point switch-springs is provided for junctions to the PostOffice local switch. Where the renters are all accommodated upon slacksections, these junctions are, of course, not required ; the switch-springsare, however, always fitted. Two junctions are provided from each…
Telephone · Postal service
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