Abstract
An adiabatic low temperature calorimeter with a built-in cryorefrigerator has been constructed. Care was taken in the design to mechanically isolate the calorimeter from the refrigerator whose vibration would otherwise interfere the performance of the calorimeter. The refrigerator worked either to simply cool the calorimeter to 16K or to liquefy hydrogen in the cryostat which was thereafter cooled to 13K by evacuation of the liquid hydrogen. The results of heat capacity measurements on benzoic acid as a standard material showed deviations from the statistical average of several published data of less than 2% between 13.81 and 20K, about 0.5% between 20 and 60K, less than 0.1% between 60 and 275K and less than 0.2% between 275 and 340K. The scattering of the experimental points from a smooth curve was substantially less than the inaccuracy, ranging from 1.0 to 0.05% depending on the temperature.
