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Original bundle of letters and papers concerning the 4th Earl’s patents for a machine which he had invented for removing leaves and other matter from turbines, 1901-4; together with notes on his experiments with electro-plating, 1908. [Not in chronological order.]

Original bundle of letters and papers of the 4th Earl about sewage disposal at Birr, by turbine and sundry other methods; the correspondents include Bindon B. Stoney [see K/24. Not in chronological order.]

Four envelopes of tradesmen’s accounts to the 5th Earl, including a few to Lady Rosse, from London, Dublin and Birr tradesmen (primarily the first) for all manner of goods (among them a pendant brooch supplied by C. Faberge,
1910), but excluding accounts for major items connected with Birr Castle and gardens [for which see M/25 and 33 respectively], 1910-18; together with 7 volumes of Birr Castle house-keeping books kept by Lady Rosse/de Vesci and (in one case) her sister, Countess de la Feld, 1910-30. [See also T/30. Not in chronological order.]