Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 339
t an expression for the direction in which motion is p^pagated,and along which the successive effects of ether-waves Icur.^ Ifthe wave-surface a6 be a plane, the rays EE ar parallel, ■ See Tyndalls Fragments of Science, p. 277. 2 In dealing witli certain phenomena (e.g. reflection of light) we ivy.… … TRANSPARENT AND OPAQUE SUBSTANCES. 321 and a collection of such rays is called a beam. If the wave-surface ab be spherical, the rays EE have a common pointat the center of curvature ; and a collection of such rays iscalled a pencil. 281. Transparent, translucent, and opaque substances. —…
Physics
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