Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 89
FiG. ;^2. … lution of the cylinder is called the pitch, or lead, of thehelix, and corresponds with the pitch of the ordinaryscrew-thread of a bolt. To draw a helix, the pitch and diameter being given: Draw the centre line E F (Fig. 34), draw semi-circle C F D equal in diameter to the required helix,draw C D…
Mechanical drawing
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