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 24
t;l<l<flMZ> Fig. 28.—A raised ruler for inking. (University of Illinois.) Raised Ruler.—Much time can be saved in inking by the use of ashort ruler (Fig. 28) supported slightly above the surface of the draw-ing by four metal points. With this device wet ink lines may be workedover freely… … Fig. 29.—Ink-bottle holders. Ink Bottle Holder.—The main purpose of an ink-bottle holder is togive the bottle sufficient stability to prevent overturning it on a draw-ing. Two metal holders are shown in Fig. 29, as well as one (c) easily 22 constructed of cardboard. While the latter is not as heavy…
Mechanical drawing
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