Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 130
er, butWheatstones is the form usually employed in England. An ABC tele-graph is very suit- ^^ able for use onprivate wires, wheregreat rapidity is notrequisite, as it canbe worked by anyperson of ordinaryintelligence withoutprevious practice.Fig. 31 gives ageneral view of theinstrument. When the… … 118 ELECTRICITY IN MODERN LIFE. directions through the coils, and by means of suitablemechanism each current is made to move the pointerthrough one space. In order to indicate any letter, the keyopposite to the required letter on the lower dial is depressed,and the handle turned until the pointer /…
Electric industries · Electricity
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