A tiny, moving point of light. Copies of the Photographs use for the discovery of Pluto. Credit: Lowell Observatory. January 1930Aeromarine_eng OP t1_j6ek8v7 wrote
Reply to comment by BlazeObsidian in A tiny, moving point of light. Copies of the Photographs use for the discovery of Pluto. Credit: Lowell Observatory. January 1930 by Aeromarine_eng
A blink comparator was used.
> The photographic plates Tombaugh was comparing with this machine were 36 x 43 centimeters (14 x 17 inches), and were long exposures taken with a telescopic camera that sported a powerful 33-centimeter (13-inch) diameter lens.
https://airandspace.si.edu/stories/editorial/finding-pluto-blink-comparator
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