Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 19
Fig. 1. CONSTRUCTION OF GEOMETRICAL PROBLEMS. To draw a clean line and preserve the point of the pencil, the part of thecone a little above the point of the pencil should bear against the edge of theruler, and the pencil should be carried steadily while drawing. Any oscilla-tion will throw the… … Fig. 2 In the use of the compasses do not make a hole through the paper withthe needle or sharp point, but only into the paper sufficient to maintain theposition. Keep the paper clean, and use rubber as little as possible. A geometrical point, which is position only, is indicated in drawing by…
Mechanical drawing
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