The contents are as follows. (i) Bell Rock, correspondence, 1805-1810, 1812, 1820-1821, and reports, 1800, 1802-1803, 1806. This consists principally of letters written by Robert Stevenson, as site engineer, to John Rennie who was nominally in charge of the work. It also includes a copy, signed by Stevenson, of his address to the Northern Lighthouse Commissioners concerning the feasibility of constructing a light on the Bell Rock, 1800, and a further report by Thomas Telford and Murdo Downie, circa 1803. (Folio 1.) (ii) Harwich, reports and correspondence, 1807, 1810, 1812-1813. (Folio 191.) (iii) Irish lights, letter, 1812. (folio 232.) (iv) May, letters, 1811. (Folio 233.) (v) Perch Rock, letters and report, 1821. (Folio 239.)