Description

UNUSUAL PARALLEL-MOTION DRAFTING COMPASS, c. 1900.  Made of brightly plated brass the compass stands 6-1/2” (17 cm) tall when closed.  Each arm is doubled, opening on different centers, the linkage causing the lower legs to remain parallel as the arms are spread apart.  Thus the center point, and the pencil or ink pen, always remain vertical, even when drawing large arcs or circles.  Accessories include a 4-1/2” long extension arm, interchangeable pen and pencil, adjustable reversible center pin on spring-loaded mount, and container for pencil leads.  An unusual instrument, in excellent condition throughout, complete with fitted case. $450.