F1371-1

Butterfield dial, with case Long Caption: Butterfield dial for latitudes 40°-55° north. Standard three-scale dial (see related terms) except for the following details: it has an oval plate. The scales are marked for 55°, 51° and 45°.The central section is engraved with the arms of the Earl of Orrery which includes lions and the family motto: 'HONOR VIRTUTIS PREMIUM' (Honour is the reward of virtue). The compass has cardinal points marked by English initials and the north point is offset 10° West of North to allow for magnetic variation. The replacement needle is surmounted by a cylindrical pivot set with a red stone. The gnomon, engraved with leaves which transform into a bird head at the centre, is adjustable for latitudes 40°-55°. On the reverse is a table carrying the equation of time in two columns. It is signed 'J. Rowley LONDINI'. Credit line: © National Maritime Museum, Greenwich, UK, Gabb Collection Object: AST0393 Artist: John Rowley Date: 1700-1720 Medium: silver; brass; glass Size: 7 mm x 55 mm x 69 mm Click here to buy a bespoke print of this image.