Image: Hadley's octant
![Hadley's octant](/images/thumb/f/fa/Hadley%27s_octant.png/767px-Hadley%27s_octant.png)
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Description: Drawing of John Hadley's octant.
Title: Hadley's octant
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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