History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 117
Fig. 55. Fig. 56. Fig. 56 represents a galvanometer attached to an electro-mag- … Fig. 57 net. This is an exceedingly delicate permanent magnet. The THE MORSE SYSTEM. 99 electro-magnetism induced in the magnet cores repels the polesof this magnet; it swings on its centre towards a horizontal posi-tion, indicating on the graduated arc the force of electro-magnet-ism. It will…
Telegraph
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