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.

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    Licence: Attribution 4.0 International (CC BY 4.0)

    Credit: 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. Source: Wellcome Collection.

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