lf is SHJ. Any division point as Lon the circle will, during the revolution, remain in a plane perpendicular to the axis and the projection of Lwill be found somewhere on a line LM perpendicular to CH. As the projection of L must also be on the ellipse,it will be found at M. It is seen, that equal… … though drawn free-hand. When some knowledge of the rate of shortening is acquired, the construction may-be dispensed with. The gear teeth in the drawing were spaced by the eye and not quite accurately, as the con-struction shows. It is true, however, that the error is scarcely noticeable. 159.…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
