Abstract
Very low dispersion spectra obtained with a coarse grating in front of a 30-inch reflector were used to determine magnitudes at 5980 A. and 4480 A. From internal evidence, and from comparisons (rather few in number) with Hogg and Mason's photoelectric work, the standard error of the mean magnitudes derived is about |$\pm{0}^\text{m}.05$|. Comparison with Dr Gascoigne's work indicates that the standard error of the gradients is ±0.08. The method is capable of extension to the tenth magnitude without unduly long exposure time.
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