Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 428
gy drawn from the phenomenaof sound. Every one who has ridden in a railway train hasnoticed that the bell of a passing engine does not always giveout the same note. As the two trains approach the sound ofthe bell is pitched higher, and as they separate after passingthe sound of the bell is lower.… … Fig. 210.— F Line of Hydrogen Superposed on the Spectrumov Sirius (VR). C (the middle C of the pianoforte) let us say. That isit gives out 512 vibrations, sound-waves, in every second.Any sonorous body giving out 512 waves per second makesthe note C. If more than 512 sound-waves reach the earin a…
Astronomy
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