Ruling pen
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A ruling pen is a vintage drawing instrument for drawing with ink or with other drawing fluids.
A ruling pen contains ink in a slot between two flexible metal jaws, which are tapered to a point. It enables precise rendering of the thinnest lines. The line width can be adjusted by an adjustment screw connecting the jaws. The adjustment screw can optionally have a number dial.
Originally used for technical drawings in engineering and cartography together with straight rulers and with french rulers, it is today used for specific uses, such as picture framing or calligraphy.
