Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 157
2)—6), thesurface. Draw I m parallel to a b, and tangent to the projections of the hori-zontal sections of the surface, draw lines perpendicular tolm, meetingit in the points m, p, q, &c. Beginning at the lowest of these points, lay off towards m distancesequal to one of the equal parts of a by… … Solutions of Topographical Problems. 151 But since this plane in rising from I to m, has a height (2) at thepoint //, it must pass below q, and therefore below q q\ and must cutthe curve (0, 2), in some point. Hence it cannot be the required plane. Commencing at p, lay off in like manner divisions…
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