History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 401
netometer represented in Fig. 89 is designed tomeasure the magnetizing power of galvanic currents. It con-sists of a vertical electro-magnet, of the U form, with an arma-ture above it, attached to the short arm of a balanced lever.The long arm of the lever is graduated decimally, to measure,… … Fig. 89. The lever is supported on an axis with knife-edge bearings.The armature may also be suspended on knife-edges attached tothe beam. On the under surface of the armature is brazed athin plate of brass, to .prevent its adhesion to the poles. A dif-ference of magnetizing power of 10 grains can…
Telegraph
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