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Whitehurst & Son sundial (1812)
The Whitehurst & Son Sundial was produced in Derby in 1812 by the nephew of John Whitehurst. It is now in the Derby Museum and Art Gallery. It is a fine example of a precision sundial telling local apparent time with a scale to convert this to local mean time. It is accurate to the nearest minute.
==Manufacturer==
The Whitehurst family was known in Derby as eminent mechanics. John Whitehurst (1713–1788) was born in Congleton, but came to Derby where he entered business as a watch and clock maker. He moved to London when appointed to the post of Inspector of Weights. His nephew continued the business under the name of Whitehurst & Son. The family business was known for their turret clocks.〔
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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