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Hadley's quadrant, or octant, Jonathan Sisson, London, 1735, with sand glass with protective cover, England, 1600s - Putnam Gallery - Harvard University - DSC07907
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Creazilla
Author:
Daderot
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commons.wikimedia.org
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self-published work
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author died more than 100 years ago public domain images
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jonathan sisson
scientific instruments in the harvard university science center
octants
john hadley (mathematician)
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