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Scientific American, Vol. 55, No. 23 (1886) (1886)
leaf 7
cylinder. sion, and the coil is adjusted to a central 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. inches. ; large enough to swing freely over the iron cylinder, is When an… … an almost exact copy of a Deprez galvanometer made by Carpentier, of Paris. Thecopy operates admirably, © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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