Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 158
hill with a given slope. Let (a, 0)—(A, 6) be the E hill, and —the given slope. The secant planes being at the units distance apart, m n .... , , ,I-?- will be the length n m 0 of the projection of that por-tion of the required linewhich joins any two adjacentcontour lines, m being thepoint at… … 152 Civil Engineering. be the projection of the required line. If it is required to descend thehill so as to reach the bottom at a point as nearly opposite to m as pos-sible, trace (h, 6) to u, and with u as a centre and the same radius asbefore describe an arc cutting (g, 5) in v; then find x, y,…
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