Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 41
irectly on the paper. This method, forinstance, is often used in making patent office drawings. Ineither case, the making of pencil and ink drawings requiresthe use of instruments especially designed for drawing straightlines and circles, and means of securing the proper proportionsbetween the… … Fig. 1. Rxiling Pen for drawing Straight Lines the case of ink drawings, the instrument used is known asthe ruling pen. The ruling pen, Fig. i, has two steel bladeshaving points or nibs which are rounded as shown at a.The nibs or points should have fairly sharp edges, and shouldbe of equal length…
Mechanical drawing
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