Rosse, William Parsons, Third Earl of … (1800-67) Short Biography – Rosse, William Parsons, Third Earl of … (1800-67) Born in York, Rosse was to attend Magdalen College, Oxford. “He experimented in fluid lenses, and made great improvements in casting specula for the reflecting telescope.” Rosse was to pay a ?30,000, a huge sum for the day, to build a 58 foot long reflecting telescope in the park of his home in Ireland, Birr castle.

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