The Laue instrument is used to orient single crystals, from 1 mm to 1 m in diameter. It is also used to determine whether or not samples are single crystals. The orientation of a crystal surface relative to a primary crystallographic direction can be determined to within 0.2 degrees. The heart of the MWL110 system is a multiwire proportional chamber with a 30 cm x 30 cm active area. The detector is equipped with a selection of four interchangeable collimators (0.5, 1.0, 2.0, and 3.0 mm), a fail-safe x-ray shutter, and a gas delivery system.