Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 25
called the Electrp-poion battery. It is extensively employed on the Ame- 1 g MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. rican lines for main circuits. In its general constructionand arrangement it differs but little from the batterylast described. The different parts of which it is com-posed are… … A clamp is arranged so as to press a platina buttonfirmly against the carbon, this button being permanentlyattached to a wire leading to a binding screw on thezinc arm of the next element. The parts are usuallymade of about the same size as in the Grove battery. The carbon connection is sometimes…
Telegraph
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