Description:
These dividers/calipers were used in conjunction with 3-D maps. There are three sets of graduated scales. Two for the opening width of the dividers: one named S (0-500, divided in multiples of 10) and one named Y (0-900, divided in multiples of 10). The other scale is part of the clinometer. It is made of a moveable cursor on a curved support. The divided scale, to measure angles of inclination, is from 25°-0-25°.