An introduction to machine sketching and drawing for industrial and technical schools (1917)
Toronto : Copp, Clark · leaf 36
f lead in the l)ow (small) compass that is used in the pencil. Use it also in the large compass,unless such hard lead is found to make the compass legs spread. Sharpen the lead on the outside only, so as to form achisel edge on the inside. The teacher should see that from this point onward in… … 4-Wrought Iron
Mechanical drawing
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