An x-ray powder camera for the investigation of substances at controlled, elevated temperatures is described. The apparatus differs in two respects from cameras previously described. In the first place, the film holder is removable without in any way disturbing the specimen or its condition in the furnace. In this way, the condition of the specimen may be independently controlled as desired while an exposed film is removed from the camera, developed, and another film substituted. This makes the apparatus especially suitable for the investigation of phase diagrams, for the specimen is never quenched or otherwise heat treated, except as desired. The apparatus also differs as to the method of maintaining the temperature of the specimen above room temperature, in that it is insulated against radiation losses rather than against conduction losses. This permits the construction of a furnace of negligible heat capacity, and because of this characteristic, the temperature of the specimen may be very rapidly varied, another feature of importance in phase diagram study. The temperature of the furnace at the specimen is calibrated by the investigation of substances having polymorphic transformations. The apparatus has been successfully employed in investigations up to about 600° C., and is suited to higher temperatures. The heating unit has also been adapted to the Weissenberg camera, which has been successfully used on a number of investigations of structural characteristics of single crystals at elevated temperatures.

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