Newton's Principia, sections I, II, III, with notes and illustrations. Also a collection of problems (1863)
Newton, Isaac, Sir, 1642-1727, Frost, Percival, 1817-1898 · Cambridge, London, Macmillan and Co · leaf 125
a third proportional to 2PF and DCD. 84. Since the chord of curvature in any direction variesinversely as the subtense QR, drawn in that direction, it is easilyseen that, if PL be the portion of the chord intercepted between 106 NEWTON. Pand DCD1, the chord of curvature at Pin the direction PL… … 86. The radius of curvature at any point of a conic sectionis to the normal in the duplicate ratio of the normal to the semi-latus rectum. Let PK be the normal, PO the radius of curvature, L thesemi-latus rectum. I. For the parabola, PO : 2SP :: JSP : £F, :: SY: SA, .. PO : 2SY :: SP : SA, ::…
Mechanics · Celestial mechanics
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