Ruling Pen
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For drawing straight lines and curves that are not arcs of circles, the ruling pen is used. The distance between the pen points, which regulates the width of line to be drawn, is adjusted by the thumb screw, and the blades are given a slight curvature so that there will be a cavity for ink when the points are close together.
Galleries
Mechanical DrawingSource
Kenison, Ervin Mechanical Drawing (Chicago, IL: American School of Correspondence, 1916)
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1024×103, 18.6 KiB
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320×32, 3.2 KiB