An introduction to the science & practice of photography (1888)
Jones, Chapman · London : Iliffe & Son · leaf 74
ects. We know that light travels from a luminous object, and the rate of its movement can be experimentally demon- strated, though the time occupied in passing over terres- trial distances is so small as to be inappreciable except by means of specially-made apparatus. Light travels through… … Fig. i.— A, luminous surface; B, opaque object ; C, screen upon which the shadow is cast. get a luminous geometric point ; and as all sources of illumination (except an individual star) have a sensible
Photography
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