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In the 19th century, sound had for the first time made a literal translation into drawing and was considered a remarkable phenomenon, though it had already been somewhat predicted by mathematicians. The physical reality of acoustic vibrations was then transformed into graphs by means of simple pendular mechanisms known as the harmonograph or auto-vibration recorder.

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Original drawings realised with a harmonograph by joseph goold


http://theartofmemory.blogspot.com

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