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Excerpt from Monthly Notices of the Royal Astronomical Society, Vol. 42
Circumstances not generally interesting here to detail have recently diverted my attention from other astronomical work to what is conventionally meant by the magnitudes of the stars. It may be sufficient here to say that, having just completed the reduction of the relative coordinates of 250 stars in the cluster 39 Messier in the constellation Cygnus, for comparison by other astronomers at some remotely future period, I felt that perhaps only one-half of the work was done, unless some reliable measures of the relative magnitudes of the stars could be secured. Prof. Pickering's most interesting researches into the results obtainable from accuracy in star magnitudes also weighed on my mind. On consulting the various authorities on the subject, I found the question, whether of result or of method, somewhat in a chaos, so far as any considerable degree of accuracy was concerned. Even Struve, for instance, with all his care, gives on some occasions not less than three different magnitudes for the same star.
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