  We present new results with a prototype detector that is being developed by
the DMTPC collaboration for the measurement of the direction tag (head-tail) of
dark matter wind. We use neutrons from a Cf-252 source to create low-momentum
nuclear recoils in elastic scattering with the residual gas nuclei. The recoil
track is imaged in low-pressure time-projection chamber with optical readout.
We measure the ionization rate along the recoil trajectory, which allows us to
determine the direction tag of the incoming neutrons.
