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Notebooks concerning the workings and the measurements of ‘The O'Leary Seismograph’ at Rathfarnham Castle, Dublin. The first notebook (1946-1957) includes diagrams and details of the pendulum, suspension: trifilar workings of the seismograph. Includes inserts: ‘Fr M Murphy was present and helped erect the pendulum. He was in Rathfarnham, for (at worst) October 1916 to September 1917. Fr Hayes was also present. Fr O'Connell says 1915 work was started’; note from Fr Richard Ingram SJ to Mr Patrick Heelan SJ inviting him to measure the static mag. of O’Leary’. The second notebook records the measurements of the seismograph at Rathfarnham Castle (4 January 1948-May 1953). It has the names of Jesuit Juniors John Moore, Michael Kelly, Hubert Delaney, Albert Diviney and Paul McShane. Notebooks found in the basement (villa room) of Milltown Park, 2014.