Equinoctial ring-dial (i.e. for Northern and Southern latitudes). Signed "Cary, London" undated, circa 1800 (with original case); showing detail of one side.

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Credit

Equinoctial ring-dial (i.e. for Northern and Southern latitudes). Signed "Cary, London" undated, circa 1800 (with original case); showing detail of one side. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.