The Carnegie Institution of Washington . 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


The Carnegie Institution of Washington . 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 The Observatory on Mount Wilson. The Solar Observatory has been developed from suggestions andrecommendations made in a report from an advisory committee andpublished in the first Year Book of the Institution in 1902. The lateProfessor S. P. Langley, a member of this committee, urged especiallythe desirability of establishing such an observatory in some elevated,subtropical locality. Professor George E. Hale, also a member of the 41 42 MOUNT WILSON SOLAR OBSERVATORY. committee, called attention likewise to the importance of additionaldirect studies of the sun and to their bearings on the more general prob-lems of stellar evolution. He recommended particularly the construc-tion of special telescopic devices and the combination of an observatorywith a physical laboratory. After testing the atmospheric and otherconditions of various possible sites, it was determined in December1904 to establish an observatory on Mount Wilson, near Pasadena,California, and Professor Hale was appointed Dir


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