Intermediate course in mechanical drawing by Thorne William Henry 1847-

Author:Thorne, William Henry, 1847- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Mechanical drawing
Publisher: Philadelphia, Williams & Brown
Published: 1889-03-25T05:00:00+00:00

line project from the front view the external and internal extremities and the centres of the top and base. These centre lines will limit the parallel lines of the tube in this view; therefore lay off on one of them the diameters of the tube and draw the lines parallel with c"d". All the points necessary for drawing approximate ellipses for the top and base in this view are now obtained.

Fig. 69. To intersect a cone of two nappes by a plane forming an angle with the axis and cutting both nappes.

By a cone of two nappes is meant one Avhich is produced by a generatrix which continues beyond the apex, the result being two equal and similar cones having the same axis and the same apex, but tapering in opposite directions.

Let each cone be 4J" high and 3" diameter at the base. Draw the top and front views as shown. Di-aw the trace of the cutting plane in the front view so that it intersects the lower base If" from one extremity and the upper base I" from the opposite extremity. In the top view draw the lines of intersection of the cutting plane with the upper and lower bases. Draw the traces of a series of horizontal planes in \\\& front and top views. Project the points of intersection of the cutting plane with these traces in the front view to the corresponding traces in the top view, and draw the curves through the points thus obtained in

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