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Ordnance survey. Astronomical observations made with Airy's zenith sector, from 1842 to 1850, for the determination of the latitudes of various trigonometrical stations used in the ordnance survey of the British Isles: Published by order of the Master General and Board of ordnance, under the direction of lieut.-colonel Lewis A. Hall, royal engineer, superintendant of the ordnance survey

An account of the measurement of the lough Foyle base in Ireland: with its verification and extension by triangulation ; together with the various methods of computation followed on the ordnance survey, and the requisite tables