Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 23
Pig. 9.—Knifing pencil point. Fig. 10.—Filing pencil point. precision and facility, as you have perfect control over the knife, which, should it slip, moves away from your hand. The lead partis best sharpened by rubbing it upon a smooth file,^ as shown in Fig. 10, after which a stroke or two upon a…
Mechanical drawing · Geometrical drawing
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