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Scientific American, Vol. 39, No. 15 (1878) (1878)
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s, I first arranged two reeds or tongues to be vibrated | mirror, and at first used the apparatus after the manner of | and has in one end a piece of rubber or cork, into which is by an electric current. These tongues were made adjust-|M. Lissajous’ tuning forks. I subsequently combined the |… … THE ELECTRICAL DIAPASON. © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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