Astronomical and Calendrical Volvelle or 'New Astronomical Instrument', Designed by James Ferguson, Adapted and Reissued by Lewis Evans and Thomas Jones, London, 1817

Paper and card instrument consisting of a circular base scale on a square sheet and two concentric volvelles including a celestial map, mounted on a square board, the scales and map printed from engraved plates, hand coloured, and varnished or lacquered. It is a version of one of James Ferguson's paper instruments which has been brought up to date by the mathematician Lewis Evans and re-issued by the instrument maker Thomas Jones; the companion instrument (14575) has the name of the 18th-century engraver J. Mynde, so this too may have been directly adapted using the original copper printing plates, amended with information valid for the 19th century, calculated by Evans.

One of a pair with 14575; the two instruments formerly hinged together, the base board of each functioning as the boards of a bound volume or portfolio, part of the leather spine remaining along one edge of each.