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JOHN HADLEY Photos ❘ Science Photo Library

John Hadley,English inventor
11829289 - John Hadley,English inventor
Engraving of a sextant designed by John Hadley
11879799 - Engraving of a sextant designed by John Hadley
John Hadley,English optical instrument maker
11829014 - John Hadley,English optical instrument maker
Hadley's telescope,1722
11879931 - Hadley's telescope,1722
Hadley's octant,1738
11586909 - Hadley's octant,1738
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