Ruling Pen

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A form of pen used for drawing lines of even thickness. It commonly consists of two blades which hold ink between them. The distance apart of the points being adjusted by a screw to conform to the desired width of the line.


pencil, graphing


William Dwight Whitney The Century Dictionary and Cyclopedia: An encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1889)


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