Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 78
evolved into V. The distances avar and bvbr are thedistances of the points a and b, respectively, from V, and areequal to the distances from ah and bh to the ground line. !NTotethat not only the distances, but the directions, of the points aand b from the F-plane must be considered. The… … Fig. 103. Fig. 104. 81. Traces of the Line. Let the line ab, Fig. 102, be pro-duced to intersect its projection aqb in the point s; then inrevolving about aqbq as axis, the point s will remain fixed, andarbT produced must pass through s. But since ab lies in Q,the point s must be the point in which…
Geometry, Descriptive
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
![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-16-11.webp)
