Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 27
sphaltum or paraffine, and insulatedfrom the upright wooden pins, DD, bythe glass sockets, CO. The pins areinserted into a horizontal scantling,E, which forms the top of the battery stand. Battery jars, of different sizes, are now made at theBrooks Paraffine Insulator Works, in Philadelphia,… … Fig. 7. CHAPTER II. ELECTRO-MAGNETISM. 30. Whenever the poles of a battery are connectedby a conductor, or series of conductors, so as to form acircuit, a current of electricity is assumed to flow fromthe negative to the positive pole, through the batteryitself, and from the positive to the…
Telegraph
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