Examination of the phonograph record und
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Persifor Frazer Jr.
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Article
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1878
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Elsevier Science
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English
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At a meeting of the Philosophical Society, held April 5th, 1878, I described the results of some examinations of the tin foil whioh had been indented by the stylus, or needle point, of the phonograph. My object was to ascertain the shapes of the indentations made by different known sounds. For this