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 (1920)
Griffin, Charles Lewis, 1867- [from old catalog], Adams, Charles Clyde, 1882- [from old catalog] joint author · Chicago, American technical society · leaf 84
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 of… … 7 C R d 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…
Machinery
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
