The thermal relaxation method is used to measure heat capacities of small samples from 0.060 to 1.2 K. The calorimeter incorporates a low heat capacity holder, and is designed to be used in conjunction with a3Hesngbnd;4He dilution refrigerator. The accuracy was checked by measuring a 2 g copper sample. A least squares fit of the copper data yields a ggr; value of 0.688 mJ (K2g at.)minus;1which agrees to 1.0percnt; with published values of ggr; for copper. The data exhibit a standard deviation of 5.6percnt; around the fit.
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