The Popular recreator. A key to in-door and out-door amusements .. (1873)
London, New York [etc.] Cassell, Petter & Galpin · leaf 125
a ray. A ray is the smallest portion of a beam oflight which we are capable of conceiving, as indicating adirection around which the luminous waves are vibrating,for, unlike the wave, a ray has no material existence. regarded a3 a pencil, it is then termed a beam, which mayconsist of parallel, as… … Pencil of Light.—The lines of light or raya which come froma luminous point, reach the eye as a cone with the pupil of theeye a3 a base, and the point for an apex, as in Fig. 1. Such anassemblage of rays is termed a pencil, or conical pencilof light. When such a pencil extends over a great…
Amusements · Games · Sports
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