 | Encyclopedias and dictionaries - 1911 - 1090 pages
...the axis and the plane containing the axis and the wave-normal; the ray-velocity is the reciprocal of the length of the perpendicular from the centre on the tangent plane. By reciprocating with respect to a sphere of unit radius concentric with the ellipsoid, we obtain a... | |
 | Encyclopedias and dictionaries - 1911 - 1086 pages
...the axis and the plane containing the axis and the wave-normal; the ray-velocity is the reciprocal of the length of the perpendicular from the centre on the tangent plane. By reciprocating with respect to a sphere of unit radius concentric with the ellipsoid, we obtain a... | |
 | Edinburgh Mathematical Society - Electronic journals - 1913 - 382 pages
...intercepting two elements of the homwoid at E and F, and let the area of the element at E be ./S. If the length of the perpendicular from the centre on the tangent plane at E be p, the u1a&> of the element is l^ppdkdS|k. Now to dS we have by the theory of corresponding... | |
 | Physics - 1907 - 858 pages
...angle da>, intercepting two elements of the hoinceoid at A and B : let t/s be the area of that at A. The length of the perpendicular from the centre on the tangent plane at A being p, the mass of the element is i;>/x/A'r/s//.- ; and if </s' be the element at A' of the... | |
 | Geometry, Solid - 1974 - 324 pages
...differentiating the last equation, therefore A (a^2 + /?2!/2 + yV) + «Z2 + j8m2 + yn,2 = 0. Let p be the length of the perpendicular from the centre on the tangent plane, and D the semi-diameter of the quadric, or its conjugate, in the direction (l, m, n), then a2*2 + j3V... | |
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... the length of the perpendicular from the centre on the tangent plane. 
