Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 43
each other bythin paper. It is claimed that, by this method of winding, a coil of a given.lengthand gauge of wire, and, consequently, of a given resistance, can be made of muchless diameter than is possible with silk insulated wire, while, at the same time, thenumber of convolutions will bo… … Fig. 13. This is provided with a key, as shown in the figure, thewhole being conveniently and compactly arranged to fitinto an oval case four or five inches long, which may becarried in the pocket. It is an extremely convenientapparatus for line repairers. The cut shows the ar-rangement…
Telegraph
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