e the motion ofthe engine towards him has the effect of shorten-ing the sound waves, and shrillness increaseswith the shortness of such waves—with the great-er number per second he hears. If all the enginesof the line have whistles exactly alike, a listenerwith his eyes shut can easily tell whether… … Fig. 88.At waves between two points at rest relatively to each other. B, waves between two points at a shortening distance apart. C, waves between two_points at a lengthening distance apart. Huggins, the pioneer in applying this principleto reading stellar motions, adopts a parallelillustration: To…
Astronomy · Geology
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