Octant from England invented by John Hadley used mirrors to measure sun's inclination above the horizon at Royal Ontario Museum. Toronto, ON.

Octant (Hadley quadrant) (c1790-1810) from England invented by John Hadley (1734) used mirrors to measure sun's inclination above the horizon at Royal Ontario Museum. Toronto, ON.

Octant (Hadley quadrant) (c1790-1810) from England invented by John Hadley (1734) used mirrors to measure sun's inclination above the horizon at Royal Ontario Museum. Toronto, ON.
Photo by Jim Steinhart © 2023, all rights reserved. (Ref: ONTR6713)

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