Astronomical Ring of an unusual type, signed "Butterfield Paris". Showing the opposite side of the instrument to that on which Butterfield's signature occurs. Undated, circa 1690. This instrument is closer to an
Astronomical rings - Wikipedia
astronomical dial; ring-dial; sundial | British Museum
Ring dial | Royal Museums Greenwich
Astronomical Ring of an unusual type, showing the side of the instrument "Butterfield Paris". Undated, circa 1690. This instrument is closer to an equinoctial ring dial than most astronomical rings. | Wellcome Collection
The place of the UERD in the armillary section of the classification... | Download Scientific Diagram
Universal equinoctial ring sundial, astronomical four ring dial | Science Museum Group Collection
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Epact: Astronomical Ring Dial signed by Gualterus Arsenius, dated 1572
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Astronomical Ring Sundial – Obscuriosity
Astronomical rings - Wikipedia
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