1. P. Dunsheath, Chapter 5, Ref. 28.
2. H. C. Passer, Chapter 6, Ref. 9.
3. I. C. R. Byatt, The British Electrical Industry, 1875–1914, Oxford University Press, 1979.
4. C. M. Jarvis, JIEE 1: 280, 566, 1955; 3: 310, 1957; 4: 298, 1958.
5. G. W. O. Howe, Report of the British Association for the Advancement of Science, Toronto, 178, 1924.