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- W2039021044 abstract "In 1908, shortly after magnetic fields had been found in Sunspots, an attempt was made to observe the Zeeman effect due to the general magnetic field of the Sun with the 60-foot tower telescope and 30-foot spectrograph of the Mount Wilson Solar Observatory. Although slight shifts of certain solar lines, such as might be caused by. a magnetic field, were found on measuring the photographs, the quantities. were too small to command confidence, and the work was postponed until more perfect polarizing apparatus could be provided. The investigation was resumed in October, 1911, but no certain evidences of the Zeeman effect were detected. On the completion of the 150-foot tower telescope and 75-foot spectrograph, observations were begun with .this instrument in January of the present year, The objective of 150 feet focal length now used with this telescope was not then ready, and, accordingly, the 12-inch objective of 60 feet focal length, belonging to the 60-foot tower telescope, was temporarily transferred to the new tower. This forms. an image of the Sun 6.7 inches in diameter on the slit of the spectrograph. After passing through the slit the light descends vertically into a well, excavated in the earth beneath the tower, to a depth of 75 feet, where it falls upon the objective which serves for both collimator and camera of the auto-collimating spectrograph. We were fortunate in having a large grating of the finest quality, ruled by Michelson, which gives almost theoretical resolution in the third order spectrum. Here the scale is 4.9 mm to the Ängström unit, corresponding to a distance of 29 mm between the D lines." @default.
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- W2039021044 date "1912-01-01" @default.
- W2039021044 modified "2023-10-15" @default.
- W2039021044 title "Preliminary note on an attempt to detect the general magnetic field of the Sun" @default.
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- W2039021044 doi "https://doi.org/10.1029/te017i004p00173" @default.
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