The first class in physics was offered during the 1910-1911 session. The department was charged with the task of developing classes designed to meet the physical science needs of all University colleges. The purchase of seismic instruments, the establishment of a campus weather station, and the planning and construction of the Physics Building were achieved during the department's first decade. Faculty interests in the 1920s and 1930s served as the foundation for much of the department's future research. Expertise in meteorology, climatology, and the physics of the aurora led to the creation of the Institute of Upper Atmospheric Physics (1956), the Institute of Space and Atmospheric Studies (1965), and the Space Engineering Division (SED Ltd) in 1965. Interest in nuclear physics led to the purchase of the Betatron (1948), the first non-commercial cobalt-60 unit for cancer treatment (1952), and the linear accelerator (1964). The following have served as head of the department: J.L. Hogg (1911-1919); A.G. McGougan (1919-1924); E.L. Harrington (1924-1952); B.W. Currie (1952-1961); R.N.H. Haslam (1961-1964); L. Katz (1956-1976); R. Montalbetti (9176-1991); E.J. Llewellyn (1991-1993); H.S. Caplan (1993- ).