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Apparatus for showing distortion in the photoheliograph

1858-1876
Photograph of the photoheliograph used in Japan for the French Transit of Venus Expedition 1874

Photograph of the photoheliograph used in Japan for the French Transit of Venus Expedition 1874

1874
Photograph of photoheliograph, used in the Transit of Venus Expedition of 1874

Photograph of photoheliograph

1876