Image: Oughtred's circular slide rule with sundial on reverse, Elias Allen, London, c. 1633-1640 - Putnam Gallery - Harvard University - DSC07908
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Description: Exhibit in the Putnam Gallery - Harvard University - Cambridge, Massachusetts, USA.
Title: Oughtred's circular slide rule with sundial on reverse, Elias Allen, London, c. 1633-1640 - Putnam Gallery - Harvard University - DSC07908
Credit: Own work
Author: Daderot
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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