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 67
hic alphabet. The sustained tone renders possiblethe use of rythmical symbols so that a single movement maystand for a number of different letters, and no letter needhave more than two characters. 3. Jlorse Electric Telegraph.—1. What is the MorseTelegraijhic sys.em? The Morse system permanently… … The Morse key consists of a brass lever AB about five inches longA hung upon a steel arborbetween set screws.The lever is connectedwith one electrode of thebattery. It is capableof vertical motion onlyF F through a very small space. An ebonite button at A is used to depress the levertill it strikes…
Telegraph
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