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We demonstrate that the steady flux ff-cm 4111915-05 undergoes periodic absorption dips with a period of 50 minutes. This period most likely represents the underlying orbital period of the system. Variations in the depth and duration of these events suggests that they are caused by a bulge in the ed ge of the accretion disk, at the point where the gas stream impacts the rusk. The mass losing star 0 this system is probably a low mass white dwarf. The spectrum of the clips indicates that the metallicity of the absorbing material is at least a factor 1_/ below solar values. l Also Dept. of Physics and Astronomy, Univ. of Maryland