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 16
position, as illustrated in Fig.14e. This avoids any unnecessary enlargement of the puncture madeby the needle point, and also permits the nibs of the pen to bear evenlyon the paper. Bow Instruments.—The convenience and increased accuracy ob-tained by the use of small bow-dividers and compasses…
Mechanical drawing
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