Abstract
In the September (1907) number of this journal (Vol. XII, No. 4, page 184) it was stated that the Baldwin magnetic observatory of the United States Coast and Geodetic Survey would be kept in operation until another magnetic observatory could be established somewhere west of the Mississippi River to replace it. During the early part of 1909 a site for a magnetic observatory was selected in the vicinity of Tucson, in the Territory of Arizona, after a careful inspection had been made of a number of possible locations, and after a magnetic survey was made of the finally adopted location. Construction work on the observatory buildings began in the latter part of June, 1909, and the buildings were ready for the installation of the magnetic instruments by the first of November, 1909.
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