Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 156
urface, are nearer to-gether or farther apart, andas the chords of the elemen-tary curves correspond moreor less nearly with them. If the curves are verynear in space, the chordsof the elementary portionsof their projections may beregarded as parallel, andcd ef f will then becomea trapezoid. v… … 150 Civil Engineering, gent to a given hill, the plane to lie entirely above the surface of thehill. Let (a, 0)—(6, 6) be the line, and (<•, 0)—(d, 1)—6) the givensurface. Through each point of division of the line draw horizontal lines tan-gent to the horizontal sections of the surface; a e, 1…
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