  We are constructing a Ring Imaging Cherenkov detector (RICH) for the CLEO III
upgrade for precision charged hadron identification. The RICH uses plane and
sawtooth LiF crystals as radiators, MWPCs as photon detectors with TEA as the
photo-sensitive material, and low-noise Viking readout electronics. Results of
a beam test of the first two out of total 30 sectors are presented.
