[en] A nuclear adiabatic demagnetization cryostat, capable of cooling ³He into the superfluid phase at zero pressure, has been completed and partially tested. The cryostat, which is of standard design, uses a 76 mm bore superconducting solenoid which provides an 80 kilogauss field over effective length of 0.2 m. The heat exchanger contains 10 cm³ of sintered 2 micron Pd powder with estimated surface area of 25 m². At the time of writing, the cryostat has been used to cool ³He containing 0.1 % of ⁴He, and the observed Kapitza conductance between Pd and ³He is roughly proportional to ³T down to at least 2 mK. A sample of ³He purified to about 50 ppm has been prepared, and it is hoped that the Kapitza conductance of the sintered Pd will be proportional to T when it is in contact with pure ³He, in agreement with previous observations. The temperature of the ³He sample was measured with a commercial pulsed Pt nmr thermometer, which can be self-calibrated using the Korringa relation. The results of experiments indicated that the ratio of discontinuity to the normal heat capacity Δ C/C was smaller than expected and it is about 2 to 2.5, in agreement with the measurements of Shields and Good Kind which were made by the same method. (Kobatake, H