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Forty-seven letters, 1830-1846, from James Watt [1769-1848] of Birmingham and Doldowlod House, Radnorshire to William Mylne [1734-1790] and Robert Mylne [1733-1811], London. They relate to the making of machinery, to alternations made by Watt at Doldowlod House, and to the activities of surveyors employed by a company desirous of constructing a railway through part of Watt's property.

Twenty-seven letters, 1845-1847, from the engineer James Watt, jnr, of Aston Hall, Warwickshire, to Robert William Mylne, architect and engineer, relating to the rebuilding for Watt of Doldowlod, parish of Llanyre, Radnorshire, and containing references to the Gloucester and Aberystwyth Railway, the Central Wales Railway and the Welsh Midland Railway (ff. 29-30, 31 verso-32).