Abstract
IN experimenting lately with the phonograph it occurred to me to try whether, after a series of musical or articulate sounds have been recorded, other series could successively be superimposed on the same tinfoil and reproduced. I found that if the instrument be simply reset to the starting-point, and sung or spoken to a second time, it will afterwards faithfully reproduce both series of sounds as though two persons were singing or speaking simultaneously, and by repeating the same process, a third and fourth voice may be added, or one or more instrumental parts, all of which will be reproduced. This experiment forms a striking commentary on Helmholtz's theory of the mode in which the ear recognises different tones in a chaos of sound, by analysing the compound wave, which it receives, into its component simple vibrations. Here the aggregate impressions on the tin-foil produce, so to speak, a compound indentation capable of reproducing a wave of sound which the ear can resolve into the original constituents.
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BIDDER, G. The Phonograph. Nature 18, 302 (1878). https://doi.org/10.1038/018302b0
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DOI: https://doi.org/10.1038/018302b0
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