John Herschel: „Decaying framework of William Herschel's forty-foot telescope at Slough, 1839. Experimental negatives: left, silver on paper, summer 1839; right, silver on glass, 9. September 1839, each approximately 10 cm diameter“ (aus: Ann Thomas, Beauty of Another Order. Photography in Science, Ausstellungskatalog National Gallery of Canada, Ottawa/Ontario, New Haven, London: Yale University Press, 1997, S. 46)

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