Definition of blink comparator
: 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
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First Known Use of blink comparator
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