An instrument for the measurement of photocurrents is described. It has the advantage of an inherent time response of 0.1 second with an accompanying sensitivity of 2.0×10−13 ampere per inch deflection on the oscillograph screen. These characteristics are shown to be desirable for the evaluation of transient photocurrents. A short discussion of the application of the instrument to the measurement of transient photocurrents in photographic emulsions is presented. These currents require two seconds to reach a maximum amplitude for a variety of emulsions. Thus the process giving rise to these currents may be electrolytic rather than electronic.
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Miller et al. (1953) studied this question.
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