Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 220
the lens is also covered by a diaphragmso as to use only the central portion, for the same reason.The lenses are placed inside a tube bLackened to absorball stray rays of light. The tube is also constructed sothat one part can move inside the other to vary the dis-tance between the two lenses, and… … Fig. 247. with a concave mirror below to condense the light uponthe object placed upon the stage. Section III.—The Camera and Lantern. 724. The Camera. If a small aperture be made in theside of a closed apartment, the objects in front form an in-verted image upon the opposite wall.* This effect is…
Physics
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