The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 56
glomerate form represents a distinct advance in thatthe internal resistance of the cell is greatly reduced by the absence of theporous pot. The manganese dioxide is mixed with carbon and is pressedinto the form of a solid block. The blocks are held in position on the LeciancM Cell. 41 carbon plate… … 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.
Telephone · Postal service
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