Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 15
ojections onthe horizontal and vertical planes respectively. If the pointA remain fixed and the line be revolved until it is parallel toV the point B will move to M, in an arc, the plane of which isparallel to H. The projection of this arc on H is bm and on Vis the Une bm. The horizontal projection…
Projection
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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-12-7.webp)
