| Pierre Jules Cesar Janssen Transit of Venus 1874 Glass negative, in wooden frame 25.5 x 25.5 cm National Maritime Museum Id number: AST1087 LL/46459 Circular negative in square wooden frame. 48 exposures of the planet Venus crossing the Sun's limb with number scratched onto the glass every tenth. Paper label stuck into the centre gives details of the photograph including the date.
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