American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 45
b is usedin the cell until none of it remains. Each zinc, asshown in Fig. 15^, is furnished with a tapered postwhich is coned out underneath; the size of thesocket thus formed corresponding to that of thetapered post. The post is forced into the socket ternal resistance of the cell to .7 as… … CHAPTER III. THE DYNAMO MACHINE IN TELEGRAPHY. Ten or twelve years ago it would have been unnecessary to write a chapter de-voted to tlie dynamo-electric machine in a book descriptive of electrical telegraphy,but to-day such a work would scarcely be complete without reference to thatmachine. The…
Telegraph
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