. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. the dependence of the current on the applied potentialwhen the radiator temperature was 573° C. The abscissae will represent voltswhen multiplied by 146. The current, as will be seen from the figure, ispractically saturated with 200 volts. In the actual measurements describedbelow, the applied potential was 350 volts, so that the currents obtainedwdth the temperature stated above, and with all lower temperatures, wereundoubtedly saturated. Higher radiator temperatures were employed, butthe saturation of the currents
. The Complete Photo-Electric Emission from the Alloy of Sodium and Potassium. the dependence of the current on the applied potentialwhen the radiator temperature was 573° C. The abscissae will represent voltswhen multiplied by 146. The current, as will be seen from the figure, ispractically saturated with 200 volts. In the actual measurements describedbelow, the applied potential was 350 volts, so that the currents obtainedwdth the temperature stated above, and with all lower temperatures, wereundoubtedly saturated. Higher radiator temperatures were employed, butthe saturation of the currents was less satisfactory. The saturation curve corresponding to a radiator temperature of 624^ C. isshown in fig. 7. In this case saturation appears to be just reached at thehighest potential at my disposal, namely, 350 volts. (The abscissae in fig. 7have to be multiplied by 1*46 to give volts.) It is possible that the * Phys. Eev., vol. 32, p. 492 (1911).t Phys. Eev., voL 2, p. 453 (1913). Emission from the Alloy of Sodium and Potassium, 365 15- 10- 5 z: LU trq: o. -yr 0 APPLIED POTENTIAL 50 100 Fig. 6. 150 200 15- 10 z bJ a: 0 50 APPLIED POTENTIAL Fi0. 7. VOL. XCJII.—A 25o 2 F 366 Dr. W. Wilson. The Complete Photo-electric measured, when the highest radiator temperature (669° 0.) was used, isslightly below the saturation value, but is not likely that it is much below,since the point corresponding to it in fig. 9 is not much below the straightline on which the other points may be approximately said to lie. The Positive Emission from the Badiator Wire, The experimental method described above precludes any possibility oferrors due to a negative thermionic emission from the radiator wire, since thedirection and magnitude of the applied potential were such as to effectuallyprevent any negative ions, which might be emitted from the radiator, fromreaching the alloy. It is, however, obvious that any positive emission will beincluded in the currents measured by the galvanom
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