Lord Rosse's great 72-inch () 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 'A Handbook of Descriptive Astronomy' by George F Chambers (Oxford, 1890). William Parsons, 3rd Earl of Rosse (1800-1867).

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Lord Rosse's great 72-inch () 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 'A Handbook of Descriptive Astronomy' by George F Chambers (Oxford, 1890). William Parsons, 3rd Earl of Rosse (1800-1867).

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: 1845, astronomy, brick, called, chambers, descriptive, diameter, direction., earth, east-west, engraving, george, handbook, leviathan, mounted, move, movement, north-south, parsonstown., reflecting, rotation, telescope, walls