English: Blink comparator at She Shan Observatory (Shanghai, China).
Caption reads: "Blink comparator. By swiftly comparing a series of photographs taken at different times, it is possible to detect the motion of some celestial bodies such as planets. Clyde Tombaugh discovered Pluto in 1930 with a similar instrument."
Français : Comparateur à éclipses à l'observatoire de She Shan (Shanghai, Chine).
Comparateur à éclipses. En comparant rapidement une série de photos prises à des instants différents, il est possible de déceler le mouvement de certains astres tels que des planètes. C'est avec un appareil de ce type que Clyde Tombaugh a découvert Pluton en 1930.
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{{Information |Description={{en|1=Blink comparator at She Shan Observatory (Shanghai, China).<br /> Caption reads: "Blink comparator. By swiftly comparing a series of photographs taken at different times, it is possible to detect the motion of some celest