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 34
must be carefully kept dry.The plate should be clean, and the rubbers smeared next theplate with amalgam from the back of a piece of looking-glass. A chain should be appended to the rubber and if pos-sible have complete metallic commuuication with the earth- 16. JExp riments,--1. What arc some of… … 14 MANUAL OF TELEGRAPHY. 2. What is its effect on the person? If a knuckle be held to the prime conductor a brightspark passes accompanied by sound and a prickling sensation. 3. What is the effect on adjacent bodies? The ball of the pendulum electroscope is attracted towardthe prime conductor, the…
Telegraph
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