Word: spectra
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Further proof is submitted by Professor A. Sommerfeld, of Munich, who has been lecturing in Washington. His data show that the orbits of the electrons in hydrogen and helium atoms are in accord with the lines in the spectra of these gases as predicted by Einstein...
Professor Sommerfeld, best known as an author of books on atomic spectra, has been lecturing for the last six months at the University of Wisconsin. Recently he made a lecture four of the Pacific Coast and comes from there to the University at the invitation of the Depart
Since the work of compiling the catalogue was undertaken, improved methods of stellar photography have made it possible to secure the spectra of fainter stars, and the new plan at the Observatory is to go for a second time over certain portions of the sky, adding the spectra of other stars than those already included...
...which this new survey supplements the original one is illustrated by the example of a single photographic plate recently described at a meeting of the American Astronomical Association. The plate covers a small part of the Milky Way where the stars are especially numerous, and it shows the spectra of 140 stars, only 14 of which had been included in the Henry Draper Catalogue...
...spectrum of a star, revealed by passing its light through an objective prism, shows of what material it is composed, such a catalogue is of fundamental importance to astronomers. The Draper Catalogue, containing as it does vast numbers of these spectra, is constantly used for reference in observatories. It consists of nine volumes. Seven of these have been published to date, and meanwhile the Observatory furnishes yearly to the astronomers of all countries upon request hundreds of spectra contained in the unpublished volumes...