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MPIWG,. n.d. “Metal Monochord From The Charité Collection”.
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Koenig, Rudolph. 1889. Catalogue Des Appareils D'acoustique. Paris: Impr. de P. Mouillot.
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“Helmholtz Resonators By Rudolph Koenig”. n.d. Cleveland, OH: Case Western Reserve University.
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Koenig, Rudolph. 1889. Catalogue Des Appareils D'acoustique. Paris: Impr. de P. Mouillot.
Location

After coming to Paris in 1851, Rudolph Koenig trained with the violin maker Vuillaume until 1858, when he launched his own instrument-making business at Place Lycée Louis-le-Grand. Koenig’s workshop participated in Paris’s flourishing activities in scientific research and instrument-making from the 1830s to the 1880s. More specifically, it contributed to the development of acoustics as an independent field of research.

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“Appunn’s “Tenor” Tonometer (2)”. 1876.
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“Appunn’s “Tenor” Tonometer (3)”. 1876.
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“Appunn’s “Tenor” Tonometer (5)”. 1876.
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“Appunn’s “Tenor” Tonometer (6)”. 1876.
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“Appunn’s “Tenor” Tonometer (7)”. 1876.