at the wave surface has four nodes, thetangent planes at which envelope cones, and that it has four tangent planeswhich touch along circles. Transactions of the Royal Irish Academy, vol. xvi. (1837),p. 132. Dr. Lloyd experimentally verified the optical theorems thence derived.Ibid. p. 145. The… … 458 SURFACES DERIVED FROM QUADRIGS. plane containing the two lines envelopes a cone whose sections parallel to the fixed planes are parabolas. The plane of the paper is supposed to be parallel to one of the fixed planes, and the other fixed plane is supposed to pass through the line MN, The fixed…
Geometry, Analytic · Surfaces
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