A ruling pen is a drawing instrument for drawing with ink or with other drawing fluids. Originally used for
technical drawings in engineering and
cartography together with straight rulers and
French curves, it is today used for specific uses, such as
picture framing or
calligraphy.[1]
Description
A ruling pen contains ink in a slot between two flexible metal jaws, which are tapered to a point. It enables precise rendering of very thin lines.[1] The line width can be adjusted by an adjustment screw connecting the jaws.[2] The adjustment screw can optionally have a number dial.
Rising, Justus; Reese, Harry (1955).
Tracing With Ink(16mm film). Purdue University – via A/V Geeks on YouTube. Summary: "Demonstrates tracing on cloth. Shows procedures for handling the ink bottle and for filling, adjusting, using, cleaning and sharpening pens."