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Ernest Tillotson (1904-1981) was a graduate of Leeds University, and by profession a teacher of physics at Aireborough Grammar School (now demolished). Much of his spare time was devoted to seismology, and in particular, work on the BA Seismological Investigations Committee on which he served for over thirty years. His annual summaries provide an invaluable source of information on the history of seismology during that time. He also wrote extensively on earthquakes, and read the seismograms from the Blackford Hill Observatory in Edinburgh for several years after the Second World War.

The NSA acquired Tillotson's papers shortly after his death. They consist chiefly of books, offprints, and articles on a very wide variety of subjects.