. The telephone system of the British post office. A practical handbook . che cell possesses no local action, but polarises some-what rapidly if the current is kept on for any length of time, because thehydrogen arrives at the carbon plate faster than the depolariser—, themanganese dioxide—can get rid of it. This is particularly the case withthe ordinary porous pot form in which the manganese is packed round thecarbon plate in the porous pot. An illustration of this type of cell asmanufactured by the Consolidated Telephone Company is shown inFigure 30. The agglomerate form represents a dis
. The telephone system of the British post office. A practical handbook . che cell possesses no local action, but polarises some-what rapidly if the current is kept on for any length of time, because thehydrogen arrives at the carbon plate faster than the depolariser—, themanganese dioxide—can get rid of it. This is particularly the case withthe ordinary porous pot form in which the manganese is packed round thecarbon plate in the porous pot. An illustration of this type of cell asmanufactured by the Consolidated Telephone Company is shown inFigure 30. The agglomerate 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 by means of indiarubber rings. Sometimes the zinc is heldin a small porous pot, as shown in Figure 30. This precludes all possibilityof the zinc touching the carbon and thereby causing a 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.
Size: 2391px × 1045px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelepho, bookyear1901
