Abstract
Characteristic curves for various types of radiotrons are presented, together with a discussion of some of the characteristics desired. A portable amplifier is described, and it shows that proper utilization of these characteristics has resulted in an amplifier practically free from the effects of A and B-battery drifts. It was found that when it was used to amplify the current from a cadmium photocell, to measure ultraviolet radiation, its calibration was reproducible from day to day with an average deviation of less than 0.8 percent.
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