Image: Hadley's reflecting quadrant
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Description: Drawing of John Hadley's Reflecting Quadrant
Title: Hadley's reflecting quadrant
Credit: Hadley, “Hadley’s Octant.” Philosophical Transactions of the Royal Society, vol. 37, p. 147, 1731.
Author: John Hadley
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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