Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 38
it goes that distance in y^^ of a sec-ond, or at the rate of 180,000 miles a second, the nexttooth will have arrived before the eye, and each return-ing ray be cut off. Hasten the revolutions a little, andthe next notch will then admit the ray, on its return,that went out of each previous notch :… … Fig. 5.—Measuring the Velocity of Light. 24 CREATIVE PROGRESS. posure of the sensitive plate -r-owo Par^ °^ a second, astream of light nine miles long dashes in upon the platein that very brief period of time. The highest velocity we can give a rifle-ball is 2000feet a second, the next second it is…
Astronomy
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