Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 224
220 LIGHT. luminous bodies in all directions. Provided nothing intervenes to intercept the light, they arc seen iiall situations of the eye. Another property of light is, that it requires time for its propagatioa The velocity with which itpasses from one point to another is, however, so great,…
Mechanical engineering · Mechanics · Engineering
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