1. .H. T. Hall, Rev. Sei. Instr. 31, 125 (1960).
2. C.B. Sclar, L. C. Carrison, and C. M. Schwartz, in High Pressure Measurements, Butterworth, London (1963), p. 286.
3. A. P. Young, P. B. Robbins, and C. M. Schwartz, in High Pressure Measurements, Butterworth, London (1963), p. 262.
4. F. P. Bundy and R. H. Wentorf, Jr., J. Chem. Phys. 38, 1144 (1963).
5. R. E. Lorent, Rev. Sei. Instr. 44, 1691 (1973).