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Scientific American, Vol. 39, No. 15 (October 1878) (1878)
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figures, I first arranged two reeds or tongues to be vibrated and has in one end a piece of rubber or cork, into which is mirror, and at first used the apparatus after the manner of by an electric current. These tongues were made adjust- thrust the point of a stout needle, which also passes through… … THE ELECTRICAL DIAPASON. ©1878 SCIENTIFIC AMERICAN, INC.Patents · Iron · Water · Patented · Scientific American · Mining · India rubber · Electric light · Export edition · Pure lime · American export · Platform scale · Grate surface · Sewing machine · Address munn
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