Grace's Guide To British Industrial History

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Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,713 pages of information and 247,105 images on early companies, their products and the people who designed and built them.

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.

John Hadley

From Graces Guide
Revision as of 11:26, 17 September 2019 by PaulF (talk | contribs)

c.1698 John Hadley surveyed the River Aire in preparation for the Aire and Calder Navigation

c.1704 Working with George Sorocold, John Hadley invented a method of constructing a water wheel so that it could be raised and lowered with the height of the river[1]

1726 John Hadley (presumably the same person as he had a background in surveying?) was the inventor of the nautical sextant or quadrant, which continued in use until 1876 and afterwards. Also thought to have been the maker of a Gregorian reflector telescope.[2]

See Also

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Sources of Information

  1. ↑ The Engineer 1918/10/18
  2. ↑ The Engineer 1876/09/22
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