Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 61
> for the equation sought. Scholium 1. To find where the normal cuts the axis of X,we must make y=0, then we shall have … -i^-i^y-- Application.—Meridians on the earth are ellipses; the semi-major axis through the equator is ^=3963. miles, and the semi-minor axis from the center to the pole is J5=3949.5. A plumb line is everywhere at right angles to the surface, andof course its prolongation would be a normal line…
Geometry, Analytic · Calculus
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