Jopling, Joseph, Gladwin, George, fl. 1821-1838 · London : M. Taylor · leaf 67
r ah , or any lines parallel to either, may also be measured by the latter scale. The line a b being the representation of a line of the same length as a c , either by a pair of propor¬ tional compasses, or by forming a scale in the proportion of ab to ac, any lines parallel to ab may be measured:… … If, as in fig. 110, the position of the small cube be altered, so that the diagonal BC may be parallel, and the diagonal AD perpendicular to the plane of projection, the representation, which may be traced from one fig. to the other by the corresponding letters, is given in fig. 112, in
Axonometric projection · Perspective
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