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.
Maurice Denys (sheriff) Agnes Danvers, in the 4th. Q. The arms of Denys are: "Gules, three leopard's faces or jessant-de-lys azure, over all a bend engrailed of the last". The Denys arms blazoned with these tinctures survive earliest in British Library Add.MS 45131, f. 54, a 1509 drawing of Hugh Denys (d. 1511) at the deathbed of Henry VII. The armourials are the arms of Cantilupe of Candleston Castle, Glamorgan, probably granted as "arms of patronage" to their feudal officials or tenants the Denys's, differenced by the imposition of a bend engrailled, probably before 1258. Cantilupe arms, reversed for difference, are still borne