Mathematics for engineering students, Analytical geometry and calculus (1907)
Keller, S. S. (Samuel Smith), 1867-1923, Knox, W. F., [from old catalog] joint author · New York : D. Van Nostrand company · leaf 148
pencil pressed against the straight edge, keeping thestring stretched (as at P), will describe the right branchof the hyperbola. For at any point as at P, PF - PF = (FN - PN) - (NPF - PN) =FN - NPF = l + 2a-l= 2a. Analytical Geometry. 139 The other branch may be described similarly by pivot-ing at… … Fig. 52a. Let LK [Fig. 52 (b)] = AA. Extend LK and take anynumber of points on LK produced as P, R, S, T, etc. With Fig. 52b. LP > LK as radius and F and F, successively, as centresdescribe arcs as at G, H, G and H; with the same centresand KP as radius, describe intersecting arcs at G, H, Gand…
Geometry, Analytic · Calculus
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