L0230

Parallel rule Long Caption: This ivory parallel rule would have been essential for working with navigational charts, particularly for calculating the bearing and direction of the ship’s course. Credit line: © National Maritime Museum, Greenwich, London, Rev. George Fisher Collection Object: NAV0613 Artist: Crichton Date: circa 1830 Medium: organic: ivory; metal: brass Size: 152mm Click here to buy a bespoke print of this image.