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
INDUSTRIAL DRAWING AND GEOMETRY the penknife (which should be sharp) is held in the four fingers of the right hand, which should be turned downwards, the thumbof this hand being placed under the pencil to steady it, as shown. A little practice will enable you to cut a good point with
Mechanical drawing · Geometrical drawing
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