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Seventy-two inch reflecting telescope, built between 1841 and 1845, by William Parsons, the Third Earl of Rosse. Located within Birr Castle demesne. Timber telescope set within man-made hollow flanked by Gothic style ashlar limestone walls to east and west with pointed-arched recessed blind openings. Crenellated parapet to eastern wall. Crane mechanism on flanking walls and to the north of the telescope. Timber steps to southern terminus of flanking walls. Telescope site bounded by modern railings. Restored in 1995.
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