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Automatische Übersetzung:
Lord Rosse's great 72-inch (1.828m) diameter reflecting telescope of 1845, called the Leviathan of Parsonstown. Mounted between two brick walls, it could move only in a north-south direction. The Earth's rotation provided movement in an east-west direction. Engraving from "Astronomie Populaire" by Camille Flammarion (Paris, 1881). William Parsons, 3rd Earl of Rosse (1800-1867). (Photo by: Universal History Archive/UIG via Getty Images)