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Excerpt from Terrestrial Magnetism: Results of Magnetic Observations Made by the United States Coast and Geodetic Survey in 1913 In 1882 the results of magnetic observations made by this Bureau prior to 1881, together with descriptions of station, were published as Appendix 9, Report for 1881. From that time to 1902 the results were published only in connection with a discussion of the distribution or secular change of one or more of the three magnetic elements. In Magnetic Declination Tables and Isogenic Charts for 1902 declination results were given for all stations occupied up to that time and descriptions were given of the stations occupied subsequent to 1881. From 1903 to 1911 there was published annually an appendix to the Superintendents report, giving the results of magnetic observations made during the fiscal year (July to June) covered by the report. When, in 1912, it was decided to confine the annual report of the Superintendent to administrative matters and to publish separately the scientific results which had formerly appeared as appendixes to the report, the time was deemed opportune to change from the fiscal year to the calendar year in the publication of the results of magnetic observations. Accordingly, Special Publication No. 15 contained the results of observations made between July 1, 1911, and December 31, 1912. The present publication contains the results of observations made during the calendar year 1913, together with the results of observations made in the Philippine Islands in 1912, most of which were received too late to be included in Special Publication No.15. Five magnetic observatories have been in operation throughout the year: At Cheltenham, Md.; Sitka, Alaska; near Honolulu, Hawaii; on Vieques Island, P.R.; and near Tucson, Ariz. Their records have furnished means for reducing to mean of day the values of declination obtained from the field observations. There will be found in the tables the values of the magnetic elements for each of the observatories for the year 1913. Observations On Land And Their Distribution. The distribution of the stations on land is shown in the following table, from which it will be seen that observations were made in 28 States and Territories. Numerous old stations were reoccupied in order to determine the secular change of the magnetic elements. At the request of Prof. T. A. Jaggar, director of the Hawaiian volcano observatory, a detailed magnetic survey was made of the crater of Kilauea. Observations were made at many places in the vicinity of Wilmington, Del., in order to determine the extent of the local disturbance known to exist in that area. Auxiliary stations were also established in several places in Michigan and Wisconsin, where previous observations had indicated the presence of local disturbance. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbo
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Terrestrial Magnetism
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