The bunsen flame of the manometric flame apparatus seen in the rotating mirror.
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Koenig's manometric flame apparatus ( 1862 ), used to visualize sound waves.
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It also initiated further research into tools able to image sound such as Koenig's manometric flame.
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"' Koenig's manometric flame apparatus "'was a laboratory instrument invented in 1862 by the German physicist Rudolph Koenig, and used to visualize sound waves.
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