  The first direct experimental replication of the Maxwell Demon thought
experiment is outlined. The experiment determines the velocity/kinetic energy
distribution of the particles in a sample by a novel interpretation of the
results from a standard time-of-flight (TOF) small angle neutron scattering
(SANS) procedure. Perspex at 293 K was subjected to neutrons at 82.2 K. The key
result is a TOF velocity distribution curve that is a direct spatial and
time-dependent microscopic probe of the velocity distribution of the Perspex
nuclei at 293 K. Having this curve, one can duplicate the Demon's approach by
selecting neutrons at known kinetic energies. One example is given: namely, two
reservoirs -- hot and cold reservoirs -- were generated from the 293 K source
without disturbing its original 293 K energy distribution.
