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 18
with an architects scale, the scale in use being known as the inchand one-half scale. This scale is stated on a drawing as 1%=1—0.The terms half-size and quarter-size are frequently used also, andmean 6=1—0 and 3=1—0, respectively. French Curves.—French (or irregular) curves are used to guide… … Fig French or irregular curves. made in a large variety of shapes, a few of which are illustrated inFig. 19. The general type known as ship curves (a) is frequentlyvaluable on account of the flat curves they carry. A curve of con-siderable practical value is known as a logarithmic spiral (f). A…
Mechanical drawing
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