The Carnegie Institution of Washington . ry was located on land belonging to theEscuela Regional in San Luis, Argentina, in latitude south 330 18,longitude west 411 25™ 25s, on the East Andean plateau, at an altitudeof about 2,500 feet. The buildings for the observatory and the quar-ters for the resident staff were erected during the winter of 1908-09;the instrumental equipment was supplied from the Dudley work of observing was begun in April 1909 and was completedin January 1911, when the instrumental equipment was returned toAlbany and observations were resumed on the norther
The Carnegie Institution of Washington . ry was located on land belonging to theEscuela Regional in San Luis, Argentina, in latitude south 330 18,longitude west 411 25™ 25s, on the East Andean plateau, at an altitudeof about 2,500 feet. The buildings for the observatory and the quar-ters for the resident staff were erected during the winter of 1908-09;the instrumental equipment was supplied from the Dudley work of observing was begun in April 1909 and was completedin January 1911, when the instrumental equipment was returned toAlbany and observations were resumed on the northern stars. A sub-sequent expedition to San Luis, to determine the magnitudes of thestars observed, terminated in February 1913. The first fruits of theundertaking appeared in 1910, in the form of a Preliminary GeneralCatalogue of 6,188 Stars for the Epoch 1900; this volume has servedas a basis for many studies of stellar motions; a second edition hasbeen recently issued. Dr. Lewis Boss died in 1912 and was succeeded by Benjamin Boss. 39. MOUNT WILSON SOLAR OBSERVATORY. Director, George E. Hale. Assistant Director, Walter S. Adams. Address, Solar Observatory, Pasadena, California. PRESENT INVESTIGATORY STAFF. Harold D. 0. O. M. G. Ellerman. Alfred H. C. S. M. Monk. George S. B. G. W. H. Seares. Harlow M. E. St. Van Wolfe.
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