V photometry of BM Cas based on observations from the AAVSO APASS survey, J. D. Fernie & N. R. Evans (1997) and P. Kalv et al. (2009). Two plots are shown for each dataset, with the upper plot showing V magnitudes with respect to orbital cycle, while the lower plot for each dataset showing the fully phased light curve. The red dashed lines are the approximate bright and faint limits outside of primary minimum defined by the AAVSO observations. There is no evidence for cycle-to-cycle differences in the bright and faint limits greater than a few hundredths of a magnitude, as expected if the variations have a repeatable amplitude with a timescale that is markedly shorter than the system orbit. The red squares are normal points calculated for each light curve with ± 0.025 wide binning in orbital phase.