  A new multiwire proportional chamber (MWPC) was designed and constructed for
precision studies of neutron beta decay angular correlations. Its design has
several novel features, including the use of low pressure neopentane as the
MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar
fibers. In the initial off-line performance tests, the gas gain of neopentane
and the position resolution were studied.
