. Carnegie Institution of Washington publication. decay of phosphorescence; in sidot blende. 65 by the violet light from the mercury arc passing through the stop whose constant was to be determined, the intensity was measured by shifting the position of the comparison flame on the opposite side of the photometer. vSuitable glass screens were used to equalize the colors on the two sides. To avoid errors resulting from the flickering of the mercury arc ten settings were made for each determination. 400. '« 55- Effect of varying the intensity of the exciting light. Exposure in each case 20 second
. Carnegie Institution of Washington publication. decay of phosphorescence; in sidot blende. 65 by the violet light from the mercury arc passing through the stop whose constant was to be determined, the intensity was measured by shifting the position of the comparison flame on the opposite side of the photometer. vSuitable glass screens were used to equalize the colors on the two sides. To avoid errors resulting from the flickering of the mercury arc ten settings were made for each determination. 400. '« 55- Effect of varying the intensity of the exciting light. Exposure in each case 20 seconds. The relative intensity of the exciting light is marked on each curve. 60 80 Seconds In Fig. 55 decay curves are shown for different intensities of the exciting light, the excitation in each case lasting for 20 seconds. In Figs. 56 and 57 similar sets of curves are shown for which the excitations were respectively 40 seconds and 2 minutes. A study of these curves shows that there is some approach to intensity saturation; in other words, the intensity of phosphorescence is nearly 400 300 200 100. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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