A digital clock retirement gift modelled on a ~1/3 scale accelerator beam-line scattering chamber. The full-scale device was used extensively on the beamline of a low-energy (up to several MeV) accelerator to investigate channeling in crystals and to measure oxidation rates of various materials. Crystals of the material under study would be placed in the scattering chamber, which also served as a high-vacuum enclosure, and the adjusting mechanism mounted outside the chamber, but connected through a vacuum seal to the mount holding the crystal, allowed accurate alignment of the crystal relative to the probing particle beam.
