Photoelectric photometry of galactic cepheids

Photoelectric light curves have been observed in two colours for 26 galactic cepheids, and these, together with another four variables observed only near maxinium and minimum and the 33 reported on in a previous paper, bring the total to 63 for which photoelectrically determined light curves are available This number includes all the known, nearer cepheids. The relations between shape of light curve, amplitude and period length are re-examined and it is shown that the magnitudes used by Blaauw and Morgan in their discussion of the zero-point of the period-luminosity relation are too faint by oll' I7, relative to the International P -system.