ever, of requiring a skilled operator. Furthermore the calibrations, carried out in accord with table 4b, are time-consuming; and the instrument is not applicable to some highly selective samples because nearly homogeneous energy is too little changed in spectral composition by passage through the wedges. This colorimeter has been used in setting up a color standard for ruby mica [70]; for inspection of working standards, transparent and opaque, for conformity to a master standard; and for general colorimetry by difference, for both fluorescent and nonfluorescent specimens [137].
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Fig. 9.The (u,v)-diagram developed by MacAdam [90].
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Fig. 10.Vertical cross-section of the Priest-Lange [134] reflectometer, showing Martens photometer, diffuse illuminator, and specimen holder.
Horizontal cross section of the illuminator is above.
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Fig. 11.Schematic diagram of chromaticity-difference colorimeter [68].
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