Hadley, John

Hadley, John,

1682–1744, English instrument maker. An optician by trade, Hadley built reflecting telescopes, based on Newton's model, that had greater resolution than the cumbersome refractors then in use. In 1731 he built a reflecting octant, based on Newton's sketch, that prefigured the modern nautical sextant. Hadley was a leading member of the Royal Society.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hadley, John


Born Apr. 16, 1682, in Hartford, England; died Feb. 14, 1744, in East Barnet. English inventor and astronomer. Fellow (1717) and vice-president (1728) of the Royal Society of London.

Hadley is credited with the invention of the sextant (1730–31), which is widely used in navigation.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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