Abstract
THE photographs which have been measured were taken with the five photoheliographs made by Mr. Dallmeyer for the Transit of Venus expeditions, on “patent plates” 6 inches square, the images of the sun being very nearly 3.9 inches in diameter. The dry process of Capt. Abney was used throughout.
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THE TRANSIT OF VENUS PHOTOGRAPHS 1 . Nature 18, 221–222 (1878). https://doi.org/10.1038/018221c0
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DOI: https://doi.org/10.1038/018221c0