We have completed the detailed design and most of the construction of a low temperature apparatus for preparation of stabilized atomic hydrogen, based on a proposed production method described previously (J. Physique 39 (1978) C6-108). We will briefly describe the apparatus which includes a microwave source of atomic hydrogen, a dilution refrigerator capable of temperatures below 0.1 K, a 11 T superconducting magnet, and a dewar with access from the bottom for introduction of the atomic hydrogen.