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.

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.

单词	hadley, john
释义	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. 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.
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