The Carnegie Institution of Washington . ions 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 re
The Carnegie Institution of Washington . ions 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 Director of the enter-prise. Mount Wilson is one of the summits of the San Gabriel Laboratory at Pasadena. It is 5,714 feet above sea-level, in north latitude 340 13 o and in westlongitude 1180 3 35. This site and the privileges of use and improve-ment of the road leading to the mountain have been leased from theMount Wilson Toll Road Company of Pasadena for a term of 99 establishment consists of two separate but closely related,parts, namely, the observatory with its telescopic equipments andlaboratory on Mount Wilson, and the office, shops, and physicallaboratory in Pasadena. The office and the observatory, although MOUNT WILSON SOLAR OBSERVATORY. 43 about 16 miles apart, are in intimate connection by means of thetelephone. The observatory proper is equipped with the Snow horizontalreflecting telescope, purchased from the Yerkes Observatory; a tower(vertical) telescope 60 feet high; a tcwer telescope 150 feet high; anda reflecting telescope 60 inches in diameter, mounted optical and other refined
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