Documents concerning: surrender of land for use by the Armagh Observatory 1789 - 1790, insurance policies 1794 - 1945, list of indentures concerning transfer of land and appointment of J.A. Hamilton as astronomer 1790, meridian marks 1802 - 1872, journal of works and repairs to Armagh Observatory buildings and equipment (T.R. Robinson, J.L.E. Dreyer and assistants), plans of Armagh Observatory and grounds, plans of the meteorological house 1867, chemical composition of water supply, electricity accounts 1890 - 1894.
Plans of Armagh Observatory and grounds.
Documents: c.830 pages, maps and drawings: 17
Itemised list at: http://star.arm.ac.uk/history/archives.html#Sect8.