History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 63
M. Moll, Liphaus, Quetelet, Prof. Henry, andmany others, are still engaged upon this subject. With a cur-rent of a certain intensity, or developed by a -certain pile, onekind of electro-magnet is preferable, whilst with another current,of a different intensity or origin, another kind would be… … Kg. 27. MAGNETISM. 45 It is not a bad plan to anneal it several times, in order to softenit, taking care to allow it to cool very slowly. The rapidity withwhich iron loses its magnetism, as soon as the current ceases,depends essentially upon its nature; however, it likewise dependsupon the…
Telegraph
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