Results of magnetic observations made by the United States Coast and Geodetic Survey at the time of the total solar eclipse of August 30, 1905

Abstract

In response to the request for co‐operation issued by the Director of the Department of Research in Terrestrial Magnetism of the Carnegie Institution of Washington, arrangements were made by the Coast and Geodetic Survey for special declination observations at the time of the total solar eclipse of August 30, 1905, at the five magnetic observatories of the Bureau and by the various magnetic observers engaged in field work. In accordance with the instructions issued, eye‐readings of the declination were made every minute from 5h to 11h a.m., 75th meridian mean time, and the temperature was read every fifteen minutes. The observers in charge of the various observatories were also instructed to take special care to have the self‐recording instruments in good adjustment. In addition, at Cheltenham, the Eschenhagen magnetograph was run on the “two hour” rate from 4h 30m to 6h1 30m a.m.