Amazing Sky by Alan Dyer

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Blink Comparator at Lowell.jpg

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The “blink comparator” - the device used by Clyde Tombaugh to find Pluto. He took a series of images on glass plates with the 13-inch astograph and viewed them with this device. By blinking the views back and forth he could look for objects that moved over time. With this he found Pluto on Feb 18, 1930, using plates he shot the month before.
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© 2015 Alan Dyer
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Observers, Star Parties & Telescopes
The “blink comparator” - the device used by Clyde Tombaugh to find Pluto. He took a series of images on glass plates with the 13-inch astograph and viewed them with this device. By blinking the views back and forth he could look for objects that moved over time. With this he found Pluto on Feb 18, 1930, using plates he shot the month before.