1. Leslie Hugh Callendar, “Professor H. L. Callendar, C.B.E., M.A., LL.D., F.R.S.,” Bulletin of the Institute of Physics and the Physical Society 12 (1961), 87–90; Leslie Hugh Callendar, “H. L. Callendar—Instrument Engineer,” The Chartered Mechanical Engineer 13 (1966), 67–72.
2. Frederick Guthrie, Magnetism and Electricity (London and Glasgow: Collins, 1876).
3. Arthur Granville Bradley, Arthur Charles Champneys, and John Ward Baines, A History of Marlborough College during Fifty Years, from its Foundation to the Present Time (London: Murray, 1893), 308.
4. David B. Wilson, “Experimentalists among the Mathematicians: Physics in the Cambridge Natural Sciences Tripos, 1851–1900,” Historical Studies in the Physical Sciences 12 (1982), 325–381.
5. For some comments about the rise of note-taking in the context of training for the Mathematical Tripos, see, for example, Andrew Warwick, Masters of Theory: Cambridge and the Rise of Mathematical Physics (Chicago: The University of Chicago Press, 2005), esp. 133–136 and 233–236.