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John Hadley, optical instrument maker, 1728

IMAGE number
UIS5093166
Image title
John Hadley, optical instrument maker, 1728
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Location
Science Museum, London, UK
Medium
engraving
Image description

John Hadley, optical instrument maker, 1728. Lithograph from an original painting. In 1716, Hadley (1682-1744) became a Fellow of the Royal Society and was appointed vice-president in 1728. In 1721, he invented the first Gregorian reflecting telescope. In 1730, he invented a quadrant which worked on a double-reflecting principle allowing an accurate measurement of the altitude of stars and the Sun. This instrument was the precursor of the sextant. A spirit level was attached to the device enabling it to determine a ship's position at sea. Dimensions: 130mm x 120mm. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
portrait

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Largest available format 3179 × 3504 px 1 MB
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