2 Free Photos of Astronomical Regulator By Thomas Tompion (harvard University)

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Astronomical regulator by Thomas Tompion, London, c. 1675-1685, used to observe the transit of Venus in Newfoundland, 1761 - Putnam Gallery - Harvard University - DSC07999
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Astronomical regulator detail, by Thomas Tompion, London, c. 1675-1685, used to observe the transit of Venus in Newfoundland, 1761 - Putnam Gallery - Harvard University - DSC08002
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