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2. Spirograph - Wikipedia

   en.wikipedia.org/wiki/Spirograph

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

3. Denys Fisher - Wikipedia

   en.wikipedia.org/wiki/Denys_Fisher

   Between 1962 and 1964 he developed various drawing machines from Meccano pieces, eventually producing a prototype Spirograph. Patented in 16 countries, it went on sale in Schofields department store in Leeds in 1965. A year later, Fisher licensed Spirograph to Kenner Products in the United States. In 1967 Spirograph was chosen as the UK Toy of ...

4. Pneumograph - Wikipedia

   en.wikipedia.org/wiki/Pneumograph

   A pneumograph, also known as a pneumatograph or spirograph, is a device for recording velocity and force of chest movements during respiration. Principle of operation

5. Kahootz Toys - Wikipedia

   en.wikipedia.org/wiki/Kahootz_Toys

   The first shipment of Spirograph arrived just before Christmas in 2012. The Spirograph (along with Kahootz' Lite-Brite) was exhibited at the 2013 Sweet Suite 13 [4] show in Chicago, Illinois and the 2014 American International Toy Fair in New York City, New York. [5] Since then, Kahootz Toys has expanded and released numerous new products and ...

6. Epitrochoid - Wikipedia

   en.wikipedia.org/wiki/Epitrochoid

   The classic Spirograph toy traces out epitrochoid and hypotrochoid curves. The paths of planets in the once popular geocentric system of deferents and epicycles are epitrochoids with >, for both the outer planets and the inner planets. The orbit of the Moon, when centered around the Sun, approximates an epitrochoid.

7. Hypocycloid - Wikipedia

   en.wikipedia.org/wiki/Hypocycloid

   Specifically, the Spirograph can draw hypotrochoids and epitrochoids. The Pittsburgh Steelers ' logo, which is based on the Steelmark , includes three astroids (hypocycloids of four cusps ). In his weekly NFL.com column "Tuesday Morning Quarterback," Gregg Easterbrook often refers to the Steelers as the Hypocycloids.