Publisher's Synopsis
Excerpt from Photometric Measurements of the Variable Stars ? Persei and Dm. 81 25, Made at the Harvard College Observatory
The second column gives the number of sets in each group, and the third the mean of the observed magnitudes. The points defined by these times and magnitudes were then plotted on rectangular paper, and a smooth curve drawn nearly through them. Various precautions were taken to avoid small irregularities in this curve. The ordinates were read oe, and the residuals computed from straight lines nearly tangent to the curve. These were plotted in turn, and the smooth curve drawn through them served to correct the original curve. The discussion of the rate of change in the light and of the true time of minimum, given below, also furnished 'small corrections, so that the curve should not only pass nearly through the observed points, but Should undergo no sudden change in its direction or curvature. The ordinates of the final curve are given in the fourth column, and the deviations Of the observations from them in the fifth column.
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