Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator (1914)
Griffin, Charles Lewis, 1867-, Adams, Charles Clyde, 1882- joint author · Chicago, American technical society · leaf 84
s is the same. The helix is often incorrectly called a spiral, but there is amarked difference between the two. The spiral is a curve whichlies in one plane and winds around a point, constantly recedingfrom the point, according to some law. The mainspring and hair-spring of a watch are in the form… … Fig. 52. Diagram Showing Construction of Right-Hand Helix Curve Draw two projections of the cylinder ABDC; along any element,preferably one of the contour elements AB or CD, lay off the pitchAE. Divide the circumference of the circle, which is the end viewof the cylinder, into any number of equal…
Machinery
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