Abstract
The calorimeter described by Martin in 1960 has been modified to permit the use of a platinum resistance thermometer and to enable measurements to be made on granular or powdered samples. Measurements in the room temperature region on the Calorimetry Conference Standard Sample of aluminum oxide show this new apparatus to have an accuracy of the order of 0.1%. Annealed and cold-worked copper samples measured previously have been remeasured from 15° to 90° K and in the room temperature region. A previously measured lithium sample has been remeasured between 100° and 300° K. Excellent agreement between the earlier and present sets of results confirms the accuracy of much previous work from this laboratory. The comparative usefulness of copper and platinum resistance thermometers in calorimetry is discussed.
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