Publisher's Synopsis
Excerpt from Report of the Harvard Astrophysical Conference, August 1898
In discussing the methods of producing normal spectra of stars, Mr. Edward S. King stated that at the Harvard College Observatory two methods of transforming the prismatic into the normal Spectrum had been tried with success. In the first, pho tographs were taken of the original plate through a slit with the plates moving at differential rates In the second method the plates are inclined to the axis of the lens, so as to make the scale exact for three points of it while maintaining good focus. The first method is applicable for produc ing any unequal change of scale. The second, though of an approximate char acter, is the better working method. Mr. King showed admirable photographic com parisons of star spectra with Rowland's map.
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