File:Koenig-manometric-flame-device.gif
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1862 Manometric flame apparatus of Karl Rudolf König. It was used to visualize sound waves. Source of illustration: Zimmermann, E. (1903). XVIII. Preis- Liste über psychologische und physiologische Apparate (p. 105). Leipzig, Germany: Eduard Zimmermann Script error: No such module "Message box".Template:Image other Script error: No such module "Unsubst".
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