Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 61
in a battery furnishes. Theinduced current so called is but a single wave of polarizationthat traverses the wire and ceases. But every movementwhich brings the magnet neaier, by increasing the amount ofpolarization starts a new wave. Withdrawing the magnetreleases the tension and allows the return… … OF ELECTRO-MAGNETISM. 41 2. What is the arrangement of the wires? The apparatus for secondary currents is exactly the sameas for electro-magnetic currents except that a small helix con-nected with a Bunsen element takes the place of a magnet,as in Fig. 29, P is the primary helix and I the…
Telegraph
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