单词	blink comparator
释义	blink comparator noun : an optical instrument by means of which two pictures identical in all but a few details (such as two images of the sky taken on successive nights) may be registered in a single visual field and viewed alternately in rapid succession Tombaugh then used a blink comparator, a device that compares two plates and highlights moving objects. One moving speck turned out to be Pluto. Nancy L. Hendrickson, Astronomy, November 1998 Word History First Known Use 1921, in the meaning defined above
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