The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 58
ix-block agglomerate Leclanche, and iscontained in a circular earthenware jar. Two cells are used with theDeckert transmitter and give most excellent results, but, in the Post Power Necessary for Speaking and Ringing, 43 Office exchanges, it is found that, with a new and carefully… … Figure 33. with a higher Internal resistance answers the purpose equally well. Thetwo six-block cells are usually supplemented by sufficient cells of theordinary form to provide the ringing current. The six-block cell does notpolarise to so great an extent as the ordinary cells. 44 The Telephone…
Telephone · Postal service
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