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Scientific American, Vol. 61, No. 24 (1889) (1889)
leaf 7
are inserted two common screws, not in contact with the pole piece, D, and so ar- p,g, each provided with two copper washers or ranged that when the diaphragm is set in vibra- burrs. -Around these screws are wrapped the ends tion by sound waves, it will not jar upon the pole piece. The mouthpiece,… … and small com- siderably reduced. Man sérews. When apiece of © 1889 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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