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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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History and Etymology for harmonograph

International Scientific Vocabulary harmono- (from Greek harmonia concord, harmony) + -graph

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