10-point spacing dividers. Opens to 10 inches. 6 inches tall. Eleven numbered points allow conversion of distances. Excellent tool for interpolating isobars or plotting and calculating equal divisions of distance or time. This 10-point divider is used to equally divide the space between two points with up to ten divisions. For interpolating Loran, or plotting and calculating using the decimal system. Its 11 numbered points allow easy conversion of distances. Also used by draftsmen, artists, and engineers. In very good condition.