SPIROGRAPH

Spirograph

A Spirograph is a geometric drawing toy that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids. It was developed by British engineer Denys Fisher and first sold in 1965.

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spirograph

Noun

  1. an instrument for measuring and recording the depth and rapidity of breathing movements


The above text is a snippet from Wiktionary: spirograph
and as such is available under the Creative Commons Attribution/Share-Alike License.

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