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 57
Fig.51 54 A PRACTICAL COURSE IN … Fig. 52 Fig. 53 MECHANICAL DRAWING 55 Divide the half section of the plan into any numberof equal 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.…
Mechanical drawing
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