Spirograph a hypocycloid. Spirograph 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. The name has been a registered trademark of Hasbro Inc. since 1998 following purchase of the company that had acquired the Denys Fisher company. The Spirograph brand was relaunched worldwide with original product configurations in 2013 by Kahootz Toys. In 1827 English architect and engineer Peter Hubert Desvignes developed his "Speiragraph", a machine to create elaborate spiral drawings, intended to prevent bank note forgeries.
Denys brass, Olveston father to L in Dexter position of honour. Russell was his heiress-mother, Gorges a former Russell heiress. On the R. is Sir Walter Denys, the son, with the arms of his co-heiress 2nd. wife, Agnes Danvers, in the 4th. Q. Denys:"3 leopards' faces jessant-de-lys, over all a bend engrailled". With tinctures it becomes:"Gules, 3 leopards' faces or jessant-de-lys azure, over all a bend engrailled of the last".The Denys arms blazoned with these tinctures survive earliest in BL Add.MS 45131,f.54, a 1509 drawing of Hugh Denys of Osterley(d.1511) at the deathbed of Henry VII. The armourials are the arms of Cantilupe