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Dialing scales
Dialing scales are used to lay out the face of a sundial geometrically. They were proposed by Samuel Foster in 1638, and produced by George Serle and Anthony Thompson in 1658 on a ruler . There are two scales the latitude scale and the hour scale. They can be used to draw all gnomonic dials – and reverse engineer existing dials to discover their original intended location.〔
==History==
Dialing scales were first discussed by Samuel Foster in 1638. P. Pierre Bobynet, a Jesuit drew a scale in his book ''L'horographie ingenieuse contenant des Connoissances, & Curiositez Agréables dans la composition des Cadrans'', in 1647. It was however George Serles 1657 book, ''Dialling Universal'', printed by R & W Leybourn that brought them to popular attention. These scales remained virtually unchanged for 250 years. E. C. Middleton, who had be engraving dialling scales from about 1895, suppied dialling scales accompanied by an typewritten instruction book from Birmingham in 1913– these were the scales calculated by Serle. The North American Sundial Society has printed facsimiles of both the Serle and Middleton books.
The Middleton dial appeared without explanation in the 1994 ''Encyclopedia de Diderot et Alembert'' (French). Further work has done on these rulers by F.W. Cousins, and by Fred W Sawyer from 1997–2009.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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