Hinged Ruling Pen Small 90×320 Medium 180×640 Large 288×1024 Download Tiff Original 674×2400 | (174.1 KB) Description A hinged ruling for pen easy cleaning. Ruling pens are useful in drawing with ink. Keywords hinged pen, hinged pens, Hinged Ruling Pen, pen, pens, ruling pens Galleries Mechanical Drawing Tools Source: French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)
