The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 56
Figure 30. In the form of cell used by the Post Office the zinc rod is providedwith indiarubber rings at top and bottom, and thus the same object isaccomplished without the resistance introduced by the porous pot. … Figure 31. There is far less polarisation in this form of cell than in the ordinarytype, and it is therefore more efficient. A special form of agglomeratecell is used for speaking purposes. It consists of a thick carbon rod 42 Agglomerate Cells. grooved to receive the edges of six agglomerate…
Telephone · Postal service
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