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Since the development of the ISCC-NBS (Inter-Society Color Council-National Bureau of Standards) system of color names for describing the colors of drugs and medicines (J. Research NBS, 23, 355 (September, 1939) RPIqg), a need has been recognized for a system that would accomplish the same thing for lights. The case was made more urgent by the fact that conflicting names are often used in describing the colors of flares, landing lights and beacons, signal lights, and fluorescent and phosphorescent materials.
A tentative extension of the ISCC-NBS system was, therefore, worked out for lights and is described by Kenneth L. Kelly, research associate of the American Pharmaceutical Association, in the November number of the Journal of Research (RP1565).
High-value hue names, for example red, pink, bluish purple are used, but not those of low-value, such as brown or olive. Color names including modifiers, as for instance pale, weak, or brilliant are not employed because th,e conditions of viewing are so variable that the problem is usually one of separating lights of different hues. The hue names are those used in the ISCC-NBS system and carry the same meaning.
The chromaticity ranges identified by each of these hue names are defined by areas on the ICI chromaticity diagram. The constant-hue boundaries center on the point representing standard illuminant C, and extend out to the spectrum locus. Comparisons are made between the dominant wave-lengths corresponding to the centers of the proposed hue-name ranges and similar values reported by a number of authorities. Comparisons are also made with the standard colors recognized in various specifications for marine, railway, aviation, and highway traffic signal glasses.
Lead oxide has been a constituent of ceramic glazes, glasses, and enamels since the inception of glaze and enamel decoration long before the Christian era. The reason for this is not difficult to deduce. PbO combines with difficultly fusible silica, which is the principal constituent of pottery, to form a glass at temperatures well within the range of the crude furnaces used by the ancients. The glass thus formed
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## Abstract The aim of this work was to explore the limits of memory for the hue of coloured illumination using nonspectral colours. Eightyโfour undergraduate optometry students with normal colour vision as assessed by the Ishihara 38 plate test, were given 10 s to memorize the hue of a luminous su
## W' cided, the ratios W in column 11 would have been unity in all cases, and the deviations from unity which the numbers in this column show, indicate directly the discrepancies between the two meter results. These discrepancies are more plainly shown in columns 12 and 13, from which we learn th