Compass for indian ink pen - has horizontal and vertical arms with slideways and locking for adjustment and is convertible to use leads.

摘要

The compass is for Indian ink pens or fine lead holders and has two straight arms. One which is horizontal (20), carries a vertical marking pen (26), movable horizontally in a slide (13) fixed to the other arm which extends vertically and is bent at its ends. At the top is a grip (3) and at the base a point (7) and the fixing is moved horizontally relative to the grip-point axis. It is adjusted in height by a slide (10,11) (14-16) and a threaded adjustable ring carrying the tracing system. The slide can be replaced by a fixing for an Indian ink pen.