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harmonograph
noun
har·mon·o·graph
\härˈmänəˌgraf\
Definition of harmonograph
: an instrument for combining two or more vibrations usually of two pendulums at right angles to each other and recording them in a single curve — compare lissajous figure
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Origin and Etymology of harmonograph
International Scientific Vocabulary harmono- (from Greek harmonia concord, harmony) + -graph
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