Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 128
F,G. 7.LINE SHADING. ria. Z.. … 122 A MANUAL OF MECHANICAL DRAWING. Conventional Screw Threads. Screw threads are of many forms, those in most com-mon use being shown on Plate 43. The United States, or FrankHn Institute standard:The angle of the sides is 60°. The depth is -4- of thepitch, and the top and bottom are flattened an…
Mechanical drawing
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