. Carnegie Institution of Washington publication. I 20 A • It c ^> V !2 too r k y ? \ \^ ^ k c (0 20 > * 30 *o 5CS*c. g. 83. Fig. 84 Fig. 85. Fig. 83.—Areas between the thermo-phosphorescence curves and the coordinate axes. Curve .4, excited 320 seconds (from Fig. &2); curve B, excited 160 seconds; curve C, excited 80 seconds (from Fig. 81); curve D, excited 40 seconds; curve E, excited 20 seconds; curve F, excited 10 seconds (from Fig. 80). Fig. 84.—Change in the maximum intensity as the temperature is raised. Maximum intensity vs. time of maximum intensity measured from the beginni
. Carnegie Institution of Washington publication. I 20 A • It c ^> V !2 too r k y ? \ \^ ^ k c (0 20 > * 30 *o 5CS*c. g. 83. Fig. 84 Fig. 85. Fig. 83.—Areas between the thermo-phosphorescence curves and the coordinate axes. Curve .4, excited 320 seconds (from Fig. &2); curve B, excited 160 seconds; curve C, excited 80 seconds (from Fig. 81); curve D, excited 40 seconds; curve E, excited 20 seconds; curve F, excited 10 seconds (from Fig. 80). Fig. 84.—Change in the maximum intensity as the temperature is raised. Maximum intensity vs. time of maximum intensity measured from the beginning of heating. Curve A, excited 320 seconds (from Fig. 82); curve B, excited 160 seconds; curve C, excited 80 seconds (from Fig. 81); curve D, excited 40 seconds; curve E, excited 20 seconds; curve F, excited 10 seconds (from Fig. 80). Each point on a curve is for a given temperature. On each curve the lowest point is for 90° C. and for the other points in consecutive order 155°, 207°, 2670, and 3080 C, respectively. Fig. 85.—Increase of maximum intensity of thermo-Iuminescence with increase of temperature. Curve A, excited 320 seconds (from Fig. 82); curve B. excited 160 seconds; curve C, excited So seconds (from Fig. 81); curve D, excited 40 seconds; curve E, excited 20 seconds; curve F, excited 10 seconds (from Fig. 80). curves of thermo-Iuminescence had been obtained, and from these curves were plotted showing the rise of temperature of powder and the variation in the temperature of the furnace. Fig. 86 gives the curves for two of these temperatures. The general conclusion from these measurements was that the powder reached a constant temperature in a constant time independent of the temperature. The periods of the two galvanometers used in the temperature measurements were too short to affect the shape of the curves appreciably. The method of heating employed possesses several advantages. The temperatures are known and can be accurately reproduced as many times
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