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The behaviour of lead sulphide photo-conductive cells is briefly discussed and the construction of a portable radiation pyrometer using such a cell is described. The pyrometer has been used to measure flash temperatures produced by brake applications on moving vehicles. The instrument incorporates cathode-ray oscillographic presentation and its response to flashes of radiation of duration down to 1 msec. is within ±0.5 db. of the response to steady radiation from the same source. The lowest measurable temperature of a surface of emissivity 0.3 is 200° C.
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Marshall et al. (1950) studied this question.
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