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By E. Askwith

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In placing Taylor in the development of a perspective geometry it would be extremely relevant to know to what extent he was inspired by his predecessors and what role his own work played for Lambert. Unfortunately, these points are not easy to clear up. Taylor's procedures for direct constructions are-as far as I am aware-his own, hence it is difficult to tell whether he was stimulated by others to treat this kind of problem or whether he took them up independently. Similarly, it seems impossible to answer the question whether Taylor not only anticipated Lambert but also inspired him.

Po 217 = Taylor, 1719, p. 57J Let ABCDEFG (Figure 32) be the given perspective image of a right-angled parallelepiped. To find the eye point-or, equivalently, the center and the distance of the picture-Taylor built upon results obtained in connection with Problem XIV. First he found the vanishing points H, I, and K of the three sets of parallel sides of the parallelepiped. ) The lines HI, HK and KI are then the vanishing lines of the three sets of parallel faces ((iO), p. 37). Since K is the vanishing point of lines perpendicular to planes which have HI as their vanishing line, it follows from (1°), page 36, that the center of the picture, S, lies on the normal KL to HI.

203). Instead, we find an example of another method which was not mentioned in Linear Perspective and thus probably was invented after 1715. This method is fascinating because it combines the traditional use of a plan and elevation with the approach of direct constructions. The idea of the method is to put a plane as well as an elevation of an object in perspective and to obtain the final image by a composition (p. 203). To illustrate how much theoretical insight the method requires I shall paraphrase Taylor's example of throwing a regular dodecahedron into perspective (Figure 29).

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