A Unicam 19 cm circular powder camera has been modified so as to permit streaming of a cooling liquid, such as liquid air, over the rod-type specimen during a photographic exposure. The specimen projects upwards from the specimen holder located in the camera base, and the cooling liquid enters the camera through a metal capillary passing through a light-trap in the top of the camera lid. Various specimen temperatures can be obtained by use of different liquified gases, or of a pre-cooled inert liquid. The sharpness of the X-ray reflexions obtained shows that the variation of specimen temperature during an exposure is not more than a few degrees.
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N. C. Tombs (1952) studied this question.
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