The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 213
Fig. 69. 204 Methods f07 the Solution of Special Problems [ch. viii … 228. If P, Q are adjacent points on a surface, and P, Q are the corre-sponding points on its inverse, then OPQ,OQP are similar triangles, so that PQ,PQ make equal angles with OPP. Bymaking PQ coincide, we find that thetangent plane at P to the surface PQand the tangent plane at P to the sur-face PQ…
Electricity · Magnetism
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