Historical sketch of the electric telegraph : including its rise and progress in the United States (1852)
Jones, Alexander, 1802-1863 · New York : G.P. Putnam · leaf 33
interruption of the cur-rent by breaking the connection. Thus the iron may be al-ternately magnetized and demagnetized, at the will of theoperator. The Electro-Magnetic Telegraphs are all foundedupon this simple fact. Because, by having a small piece ofmetal so poised that a small spring separates… … Morses Instrument. coming the power of the spring, but releases its hold againthe moment it loses its magnetism, and the spring again throwsit off. Now if the end of the lever has a sharp point, and aribbon-formed slip of paper is reeled off by a train of clock- THE MAGNETIC TELEGEAPH. 17 work…
Telegraph
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