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

Licence: Attribution 4.0 International (CC BY 4.0)

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. Source: Wellcome Collection.