The paper describes an instrument for taking thermal photographs utilizing infrared radiation passively emitted by objects at ambient temperature. The instrument consists of an 8-in. radiometer utilizing thermistor infrared detectors and an imaging attachment. A glow modulator forms a thermal photograph on Polaroid or conventional film.Quantitative analysis of thermal photographs is described, and several examples of thermal photographs are given.
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Astheimer et al. (1959) studied this question.