A recording apparatus suitable for thermal and differential thermal analysis has been developed. It can be used to obtain data for phase diagram investigations on small samples of rare metals and their alloys at temperatures up to 1500%.nThe thermal analysis apparatus consists of a platinum wound resistance furnace with protective atmosphere provisions and a Pt/Pt + 13 percent Rh thermocouple as sensor which feeds a one mV strip chart recorder. A bucking potentiometer used in series with the thermocouple permits a temperature resolution of better than 0.5%. For differential thermal analysis, an additional 100 M V strip chart recorder is used. The heating or cooling rate can be varied between 0.5°C/min and approximately 15°C/minute.nThe thermal analysis apparatus has been calibrated at several "fixed points" and has an overall accuracy of ± 1.5° Centigrade.
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