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Exploration of Land & Sea
Exploration of Land & Sea
John Hadley

John Hadley (1682-1744)

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 16 Apr 1682  CEJohn Hadley (1682-1744), was born, in in Enfield Chase (near East Barnet, now in London), Hertfordshire, in England.
    1716  CEJohn Hadley (1682-1744), became a Fellow of the Royal Society.
    1721  CEJohn Hadley (1682-1744), built the first Newtonian reflecting telescope.
    1730  CEJohn Hadley (1682-1744), invents a quadrant which measured the altitude of the Sun or of a star. This design later became the sextant.
    1731  CEJohn Hadley (1682-1784), showed his new quadrant to the Royal Society. After the addition of a magnigying glass to read the scale and a telescope to take the bearing, it later became the sextant.
 
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