Re: [math-fun] Somsky and Spirograph
23 Jul
2015
23 Jul
'15
7:05 a.m.
I may have mentioned this before, but there's a fabulous book. "Poly-cyclo-epicycloidal & Other Geometric Curves" By Edwin W. Alabone M.D.; D.Sc; F.R.M.S. &c. Second edition. 1912
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Dave Dyer