Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 156
m and p^ in the curvesrequired. In order to obtain the vertices or ad-jacent limiting points of the curves, drawfrom the vertex of the cone a straightline, t e, touching the circle g ef and let a horizontal plane be supposed topass through the point of contact e. Proceed according to the method… … Fig 277. THE HELIX. A helix is the curve described upon the surface of a cylinder by a point re-volving round it, and at the same time moving parallel to its axis by a certaininvariable distance during each revolution. This distance is called the pitch ofthe helix or screw. Required to construct…
Mechanical drawing
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