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John Hadley, optical instrument maker, 1728

John Hadley, optical instrument maker, 1728
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Largest available format 3179 × 3504 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3179 × 3504 px 269 × 297 mm 1.4 MB
Medium 929 × 1024 px 79 × 87 mm 945 KB

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IMAGE number
UIS5093166
Image title
John Hadley, optical instrument maker, 1728
Auto-translated text View Original Source
Artist
Unknown
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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