Jopling, Joseph, Gladwin, George, fl. 1821-1838 · London : M. Taylor · leaf 94
88 ISOMETRICAL PERSPECTIVE. Fig. 167. O' I cular diameters are marked by numbers corresponding with those of fig. 158. The principle on which these moulds are produced is, that if a cone, a be, fig. 168, be Fig. 168. S … cut by a plane d e , to produce an isometrical ellipse, and then, if cut by other planes parallel to d e , these sections will also be isometrical ellipses, the line f g passing through the centre of each. On this principle a series of ellipses, either isometrical or otherwise, circles, parabolas,
Axonometric projection · Perspective
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