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)
Cockburn, J. Roy · [Toronto] University of Toronto Engineering Society · leaf 16
al projection of B from the ground line mustbe constant. Therefore, to find vertical projection of point B, draw lineb^b parallel to the ground line and with centre a^ and radiuso^b^ describe arc b^b^ to intersect line &^&^ at b^. b^ is requiredvertical projection. In the same way, h, the… … Note—The vertical trace of the plane is its intersection withthe vertical plane. The horizontal trace is its intersection with the horizontalplane. Let ABC be the three given points, given by their projectionsat^c^ and abc. A plane passing through these three points must contain astraight line…
Geometry, Descriptive
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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