A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 58
al parts and divide the pitch into as many. Thecurves are obvious from the illustration, which is asingle thread. By a single thread is meant the wind-ing of one screw thread about the bolt-cylinder. Adouble requires two threads parallel to each other; atriple, three, and a quadruple, four. Fig. 55… … Fig. 54 Exercise 30.—Ionic volute. Figs. 51, 52, 53 and 54.Fig. 51 is an illustration of the volute spiral of an Ioniccapital in classic architecture (Fig. 54). In laying 56 A PRACTICAL COURSE IN out such a curve, either method. Fig. 52 or Fig. 53,may be used with the same results. When AB is…
Mechanical drawing
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