1. E. J. Baldes and J. F. Herrick, unpublished data.
2. M. J. Boussinesq, Comptes Rendus Acad. d. Sc. 133, 257–262 (1901).
3. A. Russell, Phil. Mag. 20, 591–610 (1910).PHMAA40031-8086
4. C. F. Schmidt and A. M. Walker, “A Thermostromuhr Operating on Storage‐Battery Current,” Proc. Soc. Exp. Biol. and Med. 33, 346–349 (1935).PSEBAA0037-9727