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Notes on mechanical drawing (1922)

Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 12

An illustration from Notes on mechanical drawing, 1922, leaf 12
conical point. Carefully sharpened pencilsare a necessity in neat and accurate drafting-. The conical point can be handled with a minimum amount of sharp-ening if inclined about 45° (Fig. 10a) so that wear comes on the sideof the point. Then, if the pencil is rotated in the fingers as lines… … 15°to 30

Mechanical drawing

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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