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 20
plan, a new sheet be-ing placed over the original sketch for each change considered. Extra Instruments The remainder of this chapter will describe various instrumentswhich while not essential to the draftsman, are decidedly convenienton certain kinds of work. Most large drafting rooms have as a… … Fig. 20-—Standard protractor. The beginner should obtain copies of the trade catalogues of firmsmakin- drafting and engineering instruments and supplies, and shouldstudy these to familiarize himself with the nature of the various de-vices on the market. Space limitations make it impossible to list…
Mechanical drawing
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