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Scientific American, Vol. 67, No. 8 (August 1892) (1892)

leaf 3

An illustration from Scientific American, Vol. 67, No. 8 (August 1892), 1892, leaf 3
of any metal or magnetic material, no sound action. Whenever the primary muscles to twitch and thus com- will be heard in the telephone, as all the inductive Fig. 4-MINEB'S Fig. 6.-INDUCTI0N pel the branch to dip. circuit is closed by its means, influences are equal and opposite; but when the coil… … the pair of coils, S' P1. Then, if in the direction indicated until Fig. 7.-INSTBUMENT FOB DETECTING THE FBE8ENCE OF METALS UNDER WATER. ) 1892 SCIENTIFIC AMERICAN, INC.

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