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Scientific American, Vol. 76, No. 22 (1897) (1897)
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ect is not marred by bad production. The more beautiful a voice and the more taken and pressed down over the funnel shaped end of ; The horn then appears as in the picture. If it is in- the horn, the funnel being 5 or 6 inches in diameter, | tended to take photographs from the membrane, it… … © 1897 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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