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Scientific American, Vol. 55, No. 23 (December 1886) (1886)

leaf 7

An illustration from Scientific American, Vol. 55, No. 23 (December 1886), 1886, leaf 7
ral position by ment or wax. The mirror has a focus of 30 or 36 A rectangular coil of No. 40 silk-covered copper wire, turning the hooked rod at the top of the instrument. large enough to swing freely over the iron cylinder, is inches. When an electrical current is sent through the coil, The… … an almost exact copy of a Deprez galvanometer made by Carpentier, of Paris. The copy operates admirably. Fig. L-U. DEFBEZ'S "DEAD BEAT" GALVANOMETEB. © 1886 SCIENTIFIC AMERICAN, INC

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