Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 91
d of being perpendicular to the plane, as is the case inortliographic projection,* are the visual rays which all converge toa single point coincident Avitli the observers eye. * In orthographic projection an object is represented upon two planes at rightangles to each otiier, by lines drawn… … 75 PERSPECTIVE DRAWING. 4. Every point or line in the projection on the plane JVI w illappear to the observer exactly to cover the corresponding point orline in the object. Thus the observer sees the point d}^ in theprojection, apparently just coincident with the point a in theobject. This must…
Architecture · Building · Carpentry
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