Papers relating to geodetic surveys, including a map and calculations of the British Isles showing trigonometrical bases; a printed 'Report of the progress of the Ordnance Survey and Topographical Depot, to the 31 December 1858'; a photograph of Lt. Colonel James R.E.; an extract from a printed work, including sections on the description of instruments used for the triangulation of Great Britain, the reduction of observations and the observations of the principal triangulations; a list of Ramsden's zenith sector observations; a printed letter by Captain J.F. Tennant replying to Mr Pratt's letter to the 'Asiatic Journal' concerning the Indian Arc of Meridian; a paper by F.G.W. Struve on 'Results of Comparisons of several linear standards'; a tracing from a map of the Iberian Peninsula showing trigonometrical bases; a tracing from a map of Middle Europe; a printed paper titled 'A letter on the true figure of the Earth addressed to G B Airy by Johannes Von Gumpach'; a paper titled 'A contribution to aid in elucidating the question of the figure of the earth by simultaneous observations with the Mercurial Barometer and the Aneroid'; and dispatches on the survey of Victoria.