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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.
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 ...
Front cover of the St Cuthbert Gospel, c. 700; the original tooled red goatskin binding is the earliest surviving Western binding.. A book cover is any protective covering used to bind together the pages of a book.
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The cover date of a periodical publication is the date displayed on the cover, which is not necessarily the true date of publication (the on-sale date or release date); later cover dates are common in magazine and comic book publishing. More unusually, Le Monde is a daily newspaper published the afternoon
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Among his other patents were the parabolagraph, the spirograph, the electric bell used in trains, and an electric arc lamp of his own design. [5] Abakanowicz published several works, including works on statistics , integrators and numerous popular scientific works, such as one describing his integraph .