ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Janssen's photo revolver. Artwork showing some of the dics and movement mechanisms within Jules Janssen's (1824-1907) photo revolver. This instrument was invented to capture the 1874 transit of Venus. Janssen took his photo revolver to Japan, where he took 48 exposures at one-and-a-half second intervals of the transit.
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