Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 325
311 Hyperbolic Concave Mirror. Heat, Light, or Sound emanating fromthe foci of a hyperbola will be reflecteddiverged, from the concave surface. 312 … Eliptic Concave Mirror. Emanating rays from either of the twofoci in an elipse, will be refracted by thoconvex surface to the other foci. Optic?. 295 Astronomical Telescopes and Opera Glasses* Example 7. Fig. 325. The principal focal distance / = 0*65 inches of theocular or eye-lens. F = 58 inches…
Mechanical engineering · Engineering
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