. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. bstance. Melting point. Resistance. 1 Potassium sulphate ! Sodium chloride Lead chloride 1 Naphthalene , 914 717 425 80 0 -95300 -79900 -54610 -2674 These measurements are very consistent with one another, as will be seenfrom fig. 8. The platinum temperatures, corresponding to the measure-ments given in Table I, were calculated by means of the formula atp+^—x = 0, (3) where tp is the platinum temperature, and x the resistance of the the constants, « and /3, the following values, deduced from the fiducialdat
. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. bstance. Melting point. Resistance. 1 Potassium sulphate ! Sodium chloride Lead chloride 1 Naphthalene , 914 717 425 80 0 -95300 -79900 -54610 -2674 These measurements are very consistent with one another, as will be seenfrom fig. 8. The platinum temperatures, corresponding to the measure-ments given in Table I, were calculated by means of the formula atp+^—x = 0, (3) where tp is the platinum temperature, and x the resistance of the the constants, « and /3, the following values, deduced from the fiducialdata in Table II, were employed :— a = 0-0008253, ^ = 0-2005. The calculated results are given in Table III. Column 2 contains theresistance of the radiator wire (corresponding to different temperatures) ascalculated by equations (2) from the measurements in Table I. In column 3 Emission from the Alloy of Sodium and Potassium. 369 are the corresponding platinum temperatures obtained by equation (3) andthe values of a and ^ given above. The Centigrade temperatures computed. PLATINUM TEMPERATURE 500 Fig. 8, by Callendars formula are in column 4. The remaining four columnscontain, respectively, the absolute temperatures, their reciprocals, the common Table III. Heatingeurreiit in radiator wire. Resistance of radiator wire, less that ofleads andcold ends. t^. t. T-i X IC*. logio 0. logio C/T^. amperes. obms. 2-3 0 -7062 2-25 0 -6874 2-20 0 -6749 2-15 0-6544 2-10 0 -6401 2*05 0 -6258 2*00 0 -6102 1-96 0-5981 1-90 0 -6802 1-85 0 -5620 ! 1-80 0 -6449 612-7589-9574-8649-9532-6515-3496-4476*7460-1438-0417-3 669 942 642 915 624 897 594 867 573 846 553 826 531 804 507 780 488-5 761-5 463 736 440 713 10 -615 10 -929 11 -14811 -584 11 -820 12 -10712 -438 12 -821 13 -123 13 -587 14 -025 7 -98497 -76397 -3394 7 -0268 8 -5000 8 -0026 9 -399010 -8405 10 -3848 11 -7696II -3166 12 -0368IS -8411IS -4338IS -1507 14 -6452li -1687 15 -6885 15 -056318 -5215 16 -0358If -6104 370 Dr. W. Wilson. The Co
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