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Hadley, John

(1682--1744)

Mathematician, born in Hertfordshire, SE England, UK. He developed many improvements to the Gregorian reflecting telescope, making it into an accurate instrument for use in astronomy. He also designed a double-reflecting quadrant which became the basis for the sextant.


Mathematicians biographies text content is © (1990), (1991-1998)
AND Reference Data Ltd.,Oxford, UK.



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