Publisher's Synopsis
Excerpt from The Draper Catalogue of Stellar Spectra: Photographed With the 8-Inch Bache Telescope as Part of the Henry Draper Memorial
To show any lines are included in the present catalogue. The classification of the faint stars is therefore somewhat uncertain. When the number measuring the brightness in the third column of Table II. Exceeds it is difficult to classify the spectrum with certainty. In expressing the wave-lengths of the lines of the spectrum the millionth of a millimetre has been adopted as a unit, following the general usage in Germany. This unit is preferred to the ten millionth of a milli metre adopted as a unit by Angstr'om, and many other physicists.
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