[73] Exp. Res., iii. 440.
[74] No record can be found of experiments with manganese at the temperature of liquid air or hydrogen; probably, however, negative results would not be published.
[75] The critical temperature of iron, for instance, is raised more than 100° by the addition of a little carbon and tungsten.
[76] Bull. Soc. Int. des Électriciens, 1906, 6, 301.
[77] Proc. Roy. Soc., 1905, 76A, 271.
[78] E. H. Hall, Phil. Mag., 1880, 9, 225; 1880, 10, 301; 1881, 12, 157; 1883, 15, 341; 1885, 19, 419.
[79] The large Hall effect in bismuth was discovered by Righi, Journ. de Phys., 1884, 3, 127.
[80] References.—(2) A. von Ettinghausen, Wied. Ann., 1887, 31, 737.—(4) H. W. Nernst, ibid., 784.—(i.) and (iv.); A. von Ettinghausen and H. W. Nernst, Wied. Ann., 1886, 29, 343.—(ii.) and (iii.); A. Righi, Rend. Acc. Linc., 1887, 3 II, 6 and I, 481; and A. Leduc, Journ. de Phys., 1887, 6, 78. Additional authorities are quoted by Lloyd, loc. cit.
[81] P. Drude, Ann. d. Phys., 1900, 1, 566; 1900, 3, 369; 1902, 7, 687. See also E. van Everdingen, Arch. Néerlandaises, 1901, 4, 371; G. Barlow, Ann. d. Phys., 1903, 12, 897; H. Zahn, ibid. 1904, 14, 886; 1905, 16, 148.
[82] Phil. Trans., 1856, p. 722. According to the nomenclature adopted by the best modern authorities, a metal A is said to be thermo-electrically positive to another metal B when the thermo-current passes from A to B through the cold junction, and from B to A through the hot (see [Thermo-Electricity]).