The D vs log t curves of Eastman 103a–O uv-sensitized plates have been studied in the near ultraviolet and vacuum ultraviolet, respectively, together with the absorption and fluorescence spectrum of the sensitization lacquer. It was found that the contrast γt, obtained from the D vs log t curves calibrated in the vacuum spectrograph, was a constant within an experimental deviation of 4 percent throughout all observed wavelengths from 1320A to 360A and was equal to the contrast of the emulsion at the wavelength of maximum intensity of fluorescence of this lacquer. Numerous methods for the calibration of plates in air have been suggested and one of them was tested in detail. The reciprocity law of these uv-sensitized plates was studied and suggestions are made on the procedures leading to correct calibration curves of commercial plates for the purpose of photographic photometry in the vacuum ultraviolet.
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