Navigator's Bone Ruler

Ship’s carpenters had to make do with mahogany, but navigators custom-ordered bone or ivory rulers from London instrument makers for drawing and measuring. Authentic replicas of three rulers dating back to the early 1800s are slightly different only in that they show inches on one side, and centimeters on the other. Hand crafted in precious bleached bone. M. 12 x 1" M. 30.5 x 2.5 x 0.3cm