. Carnegie Institution of Washington publication. PHOSPHORESCENCE SPECTRA. 49 sufficient to be detected. Another sample so prepared as to reduce the amount of water to a minimum did, however, exhibit phosphorescence of measurable duration. This preparation, so slow was its rate of flow, might be regarded as a plastic solid rather than a viscous liquid. A bead of microcosmic salt, colored in the usual manner with uranium oxide, was comparable in its phosphorescence with canary glass. URAMYL AMMONIUM SULPHATE I'* 50 40 30. 20 10 .001 .002 .003 SEC. FIG. 40. It appears that the persistence of lum
. Carnegie Institution of Washington publication. PHOSPHORESCENCE SPECTRA. 49 sufficient to be detected. Another sample so prepared as to reduce the amount of water to a minimum did, however, exhibit phosphorescence of measurable duration. This preparation, so slow was its rate of flow, might be regarded as a plastic solid rather than a viscous liquid. A bead of microcosmic salt, colored in the usual manner with uranium oxide, was comparable in its phosphorescence with canary glass. URAMYL AMMONIUM SULPHATE I'* 50 40 30. 20 10 .001 .002 .003 SEC. FIG. 40. It appears that the persistence of luminescence is due to the con- sistency of the substance and disappears as the fluidity increases; also that the peculiar type of decay here described is common, not only to the crystalline uranyl salts in general, but also to the gelatinous forms, as in this double salt, and to substances in which uranium appears in solid solution, as in the case of the canary glass. THE THIRD PROCESS. E. Becquerel,1 in the course of his great pioneer work on phosphores- cence, made a number of observations on the uranyl salts and on 1 E. Becquerel, Annales de Chimie et de Physique (3), LXII, p. 1. 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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