  We describe an apparatus designed for obtaining precise measurements of the
growth rates of ice crystals from water vapor over a range of experimental
conditions. Our aim is to produce clean, high-quality test crystals in a well
controlled environment for investigating the detailed molecular dynamics that
controls the basic physics of ice crystal growth. In this paper we describe the
nucleation and initial growth of test crystals, their transport and selection
into a experimental chamber, the creation of a stable and controllable
supersaturation, hardware and calibration issues, and the crystal measurement
via direct imaging and broad-band interferometry.
