Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 614
au in1849. Light from a bright source, S (Fig. 413), was allowedto fall upon a piece of unsilvered glass, 67, whence it wasreflected, passing between two teeth of a cogwheel, W, to amirror several miles distant. From this it was again reflectedto the first station, where, passing through the same… … which happened whenever the time occupied bythe light in traveling from the wheel to the mir-ror and back was equal to the time it took the tooth to moveforward its own width and block the gap through which thelight passed. The speed of the wheel being observed at thisinstant, the velocity of light…
Physics
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