1. See, for example, Bassett, H. N., "Bearing Metals and Alloys" (Arnold and Co., London, 1937), Chapter 3.
2. Kyropoulos, S., Refiner and Nat. Gas. Mfr., 19, 85 (1940).
3. Goodman, p. 81 in ref. 1.
4. Bowden, F. P., and Leben, L., Proc. Roy. Soc., A, 169, 371 (1939).
5. Evans, H. L., and Harrison, S. T., Chem. and Ind., 58, 122 (1939). Wood, E., and Harrison, S. T., private communications.