Smart, Edward Howard · London : Macmillian and Co. · leaf 116
projection and the angle a between the plane of the figure and the plane of projection. (2) The angle (3 which the projectors make with the plane of projection. (3) The angle y which the orthogonal projections of the projectors on the plane of projection make with theaxis of projection. 88… … Pig. 44. If PN is perpendicular to the plane tt, NP is the orthogonalprojection of the projector, and makes an angle y with theaxis of projection. The angle PPN is (3. If NO is drawn perpendicular to the axis of projection andOP joined, it is easily proved that OP is also perpendicular tothe axis…
Geometry, Projective
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