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John Hadley was a British mathematician and inventor who improved the reflecting telescope, producing the first such instrument of sufficient accuracy and power to be useful in astronomy. Hadley’s first Newtonian reflector, built in 1721, had a mirror about 6 inches (15 cm) in diameter.
- The Editors of Encyclopaedia Britannica
John Hadley (16 April 1682 – 14 February 1744) was an English mathematician, and laid claim to the invention of the octant, two years after Thomas Godfrey claimed the same. [1]
John Hadley (born on 16 April 1682, died on 14 February 1744) was a famous English inventor and mathematician, most famous for his discovery of octant (very important navigational measuring instrument) and as a first man who after 50 years of stagnation managed to improve the old designs of reflecting telescopes that were first introduced by ...
English mathematician and inventor who built the first working reflector telescope. Hadley built his Gregorian reflector telescope in 1721. The device contained a 6-inch (15.2-cm) mirror, and proved accurate enough to be successfully used by astronomers.
John Hadley was an English instrument maker who improved the Gregorian reflecting telescope and invented the quadrant for navigation.
May 18, 2018 · Hadley, John (b. Hertfordshire, England, 16 April 1682; d. 14 February 1744) optical instrumentation. Hadley was the son of George Hadley, a deputy lieutenant and, after 1691, high sheriff of Hertfordshire, England, and Katherine Fitzjames. Nothing is known of his early life or of the places of his education.
English mathematician and inventor John Hadley improved the reflecting telescope. He produced the first such instrument of sufficient accuracy and power to be useful in astronomy. Hadley was born on April 16, 1682, in Hertfordshire, England.
