A film which is specially adapted for photographing images on the P-4 monitor tube surface has been prepared. Optical sensitization is adjusted to yield peaks of sensitivity within the blue to yellow spectral region corresponding to the emission of the P-4 screen. Resolving power of the film has been found of controlling importance when used in 16-mm size and this factor has affected the choice of emulsion for this purpose. The film may be employed either as a negative or reversed.
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White et al. (1946) studied this question.
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