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Excerpt from A Manual of Practical Solid Geometry: Adapted to the Requirements of Military Students and Draughtsmen
The latter of these two elements of distortion can, how ever, be eliminated if the vertex be assumed to be infinitely distant, so that in the limiting position all parts of the Object represented may be assumed to be equally distant from the vertex. The visual rays, or projectors, on such an assumption, cease to be convergent, and become parallel one with another.
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