Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 273
ists of anAstatic Needle* suspended in a glass caseby a thread of silk. A large number ofturns of insulated copper wire is wrappedaround the lower needle and acts to de-flect it, so that a current is multipliedmany times. This instrument will detectthe presence of currents whose electro-Fiff. 323.… … *See Section 787, ELECTRICITY.
Physics
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