1. Robertson and Ubbelohde, Proc. Roy. Soc., A, 167, 138 (Figs. 5–7) (1938).
2. Ubbelohde and Woodward, Proc. Roy. Soc., A, 179, 399 (1942).
3. Ann. Rep. Chem. Soc., 36, 157 (1939); 37, 167 (1940).
4. In course of publication.
5. Ubbelohde, J. Sci. Instr., 16, 155 (1939).