Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 90
r/gss 85 ^6 A MANUAL OF MECHANICAL DRAWING. Plate 24. The Helix. To draw a V-thread screw: Draw centre line A B (Fig. 36), and on it drawsemi-circle equal in diameter to the outside diameter ofthe screw. Subdivide and project the points, as inFig. 32, lay off G H equal to pitch of thread, and…
Mechanical drawing
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