The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 135
a peg at the Post Office removes the battery A, and thebattery B drops both the calling and the Post Office visual. When theCompany insert a peg to answer, the battery B and the calling indicatorsare cut out, and the Post Office visual goes black, thus showing that theCompany have attended. The… … if a i &/ ,o=(E3=n * UootfVf^rf^ RlHfi-OPrlHOg Vta>^ \m^ t Figure 102. may be well, however, to trace the ordinary procedure. A subscriber callsup and asks for a trunk connection. He is then connected to the R.C.T.circuit by means of the special pair of cords. This act calls the PostOffice,…
Telephone · Postal service
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