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Archival description
The Rosse Papers Subfonds
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17th century letters and papers

Seventeenth-century letters and papers, 1595-1699 and 1871 of the two branches of the Parsons family, the Parsonses of Bellamont, Co. Dublin, Viscounts Rosse, and the Parsonses of Parsonstown, alias Birr, King's County.

18th century letters and papers

Eighteenth-century letters and papers, 1705-1887, of both branches of the Parsons family, but almost all of them deriving from the Parsonses of Parsonstown - excluding the papers of Sir Laurence Parsons, 5th Baronet, later 2nd Earle of Rosse, which constitute Sections C-F.

Correspondence relating to astronomy

Correspondence of the 3rd and 4th Earls of Rosse with fellow-astronomers or about the Birr and other observatories, including correspondence of the 5th and 6th Earls about the Birr Observatory, 1840-1909, 1913-14, 1938 and 1964-84.

Hon. Sir Charles Parsons Collection

Artificial collection of letters and papers, 1856-2006, received or assembled by other members of the Parsons/Rosse family, concerning the Hon. Sir Charles Parsons, the inventor of the turbine engine, a younger brother of the 4th Earl of Rosse.

Journals and drawings related to astronomy

Journals containing astronomical observations, drawings of nebula, drafts for articles and speeches on astronomy, and other papers (excluding correspondence) of the 3rd and 4th Earls of Rosse on the subject of astronomy, [pre-1828-1908].

Maps, plans and drawings

Maps, plans and drawings, [c.1610], 1638, [c. 1690] and c. 1750-1790, mainly of a size which makes it physically convenient to form them into a separate section.

Papers of 2nd Earl (Henry Flood)

Letters and papers, 1765-c. 1820 and 1855, of Sir Laurence Parsons, 5th Baronet, who succeeded in 1807 as 2nd Earl of Rosse (of the second creation, the earldom in the elder branch of the Parsons family having died out in 1764), reflecting Parsons's youthful intimacy with Henry Flood, and consisting of correspondence and speech-notes of Flood, letters to Parsons from and about Flood, and drafts for biographical and historical writings by Parsons on Flood.

Papers of 2nd Earl (personal, political and business)

Letters, 1791-1834, to Sir Laurence Parsons, 2nd Earl of Rosse, from his principal correspondents, on all manner of personal, political and business matters, arranged chronologically according to the date of the first item in each sub-section.

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