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 309
t tx to the indicatrix tJJ-... , being the limiting positionof txU, is at right angles to the binomial at Ar And sinceit is a tangent to the sphere, it is at right angles to theradius O^, and is therefore at right angles to the tan-gent AjTr Therefore the tangent at tx to the indicatrix 286…
Geometry, Analytic
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