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 352
e andsign> _.«« _ /-62 = Lt- and therefore the equations to the indicatrices are (1) z = h, - + V- = 2h, (2)z=-K,Pi P% Pi Pi §§221,222] CURVATURE OF NORMAL SECTK and the equal ion to i be surface is /i PaThe radius of curvature of the normal Bection thaimakes an angle d with the KB-plane is… … Fig. 62. eoincidc, and the normal section whieli contains them hasits curvature zero. The normal section at right angles tothe section of zero curvature has maximum curvature.These two sections are the principal sections. If OX andOY lie in the principal sections, the equations to theindicatrix are…
Geometry, Analytic
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