An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 351
the two are turned in opposite directions.If we consider the curvature of a section whose concavityis turned towards the positive direction of the :-axis to be 328 COORDINATE GEOMETRY [CH. XVI. positive, then the positive radii of curvature are proportionalto the squares of semidiameters of the… … Fig. 61. The normal section of algebraically greatest curvaturepasses through the real axis of the indicatrix (1), and thenormal section of algebraically least curvature through thereal axis of the indicatrix (2). These indicatrices projecton the &2/-plane into conjugate hyperbolas whose…
Geometry, Analytic
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