2 Free Photos of Astronomical Regulator By John Ellicott (harvard University)

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Astronomical regulator by John Ellicott, London, 1765, used to observe the transit of Venus in Harvard Yard, 1769 - Putnam Gallery - Harvard University - DSC08005
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Astronomical regulator detail, by John Ellicott, London, 1765, used to observe the transit of Venus in Harvard Yard, 1769 - Putnam Gallery - Harvard University - DSC08008
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