Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 226
220 LIGHT. luminous bodies in all directions. Provided nothing intervenes to intercept the light, they arc seen itall situations of the eye. Another property of light is, that it requires time for its propagation. The velocity with which itpasses from one point to another is, however, so great,…
Mechanical engineering
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