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What did John Hadley build in 1731?

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In 1731 he built a reflecting octant, based on Newton's sketch, that prefigured the modern nautical sextant.

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Get more facts and information about Hadley, John . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: What did John Hadley do for telescopes? What plans did John Hadley build his reflecting octant on? Did John Hadley build a reflecting octant? [ Hide these questions ]

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