Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 88
hind the front plane ; the vertex of the pyramid is i fromthe top plane, and the long edges of the base are parallel to the frontplane. III. Fig. 32 represents the same pyramid after it has beenrevolved to the right through an angle of 45°, about the right edgeof the base ; all the edges of the… … revolved to the right about the edge 2-4. As the object revolves,all points in it move in arcs of circles w^hose centres are in 2—4 andwhich are parallel to the front plane and appear horizontal lines inthe top view\ The points in the top view of Fig. 32 must then bein horizontal lines draw^n…
Mechanical drawing
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![An illustration from Brief synopsis of the course of lectures in descriptive geometry; as arranged for the first year Faculty of Applied Science and Engineering, University of Toronto. [By] J. Roy Cockburn (1922)](https://img.insideoutlibrary.com/img/200/ia-fybriefsynopsiso00cockuoft-14-10.webp)
