New period determinations for variable CP stars

Periods, or improved determinations of periods, are presented for 29 CP stars observed at La Silla in 1977-1982. The PHOT2 program's algorithm makes possible the bringing together of different observing runs, through an improved reduction of the data to a common standard system. It is noted that, in many instances, magnetic observations would be required for the resolution of ambiguities, especially in the presence of quasi-symmetric double waves.