Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 562
)ass. TOPOGRAPHICAL DRAWING. In plotting curves on a line of location, lay off from the intersectionof tangents, as C, fig. 32, the distance of the tangent points A and B, andfind the centre O of the curve, by the erection of perpendiculars to these … Degree. Radii, ft. 1Central Ordinate. 10 5729.65 0.218 20 2S64.93 0.436 30 1910.08 0.655 40 14^32.69 0.873 50 1146.28 1.091 60 955.37 1.309 70 819.03 1.528 80 716.78 1.746 90 6:37.27 1.965 lOo 57:3.69 2.183 two points, or if the ra-dius of the curve isknown, by describingarcs with this radiusfrom…
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