File:Koenig apparatus after Helmholtz (ten resonators), 1889.jpg

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English: Rudolph Koenig's sound synthesiser after Helmholtz, as pictured in his 1889 price list.
Date
Source Rudolph Koenig, Catalogue des Appareils D'Acoustique (1889), p. 26
Author Rudolph Koenig

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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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current19:32, 27 January 2024Thumbnail for version as of 19:32, 27 January 20241,250 × 1,230 (791 KB)Schminnte (talk | contribs)Uploaded a work by Rudolph Koenig from Rudolph Koenig, Catalogue des Appareils D'Acoustique (1889), p. 26 with UploadWizard

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