A model of the famous toy known as a spirograph. A circle of radius r (see blue circle below) is allowed to roll around the inside of a circle of radius R (see black circle below). We assume that the ...

Wikipedia describes Spirograph as a “geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.” While that all ...

[Tuchman] starts with a quick proof-of-concept using an actual plastic Spirograph toy to make sure it isn’t a totally unworkable idea. Unsurprisingly, the plastic is too flexible to give a ...

The Spirograph Nebula: Glowing like a multi-faceted jewel, the planetary nebula IC 418 lies about 2000 light-years from Earth in the constellation Lepus. Light and shadow in the Carina Nebula ...

Master LEGO builder [Yoshihito Isogawa] has been on a roll lately, cranking out a number of robots that make drawings reminiscent of the classic Spirograph toy. For instance, he built an elegant ...

The spirograph has been around since the mid 60s, putting it firmly in the class of being a 'retro' craft toy, but it's never really gone out of fashion. The clever cog and ring design can help ...

Over 220 primary students entered, 250 free Spirograph school bundles snapped up in 72 hours and 500 primary schools downloaded Spirograph resources! LONDON, LONDON, UNITED KINGDOM, December 18 ...