. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. PLATE XV. The Intra-Mercurial Cameras and the Moving-PlateSpectrograph, Flint Island. A Total Eclipse of the Sux 71 adjustments which make the difference between good andexcellent results and the rehearsal. The duration of totality was 3™ 52^; to utilize those preciousseconds to the utmost, it was essential that every one should beso famihar with his particular duties that he would performthem mechanically^ with precision and t
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. PLATE XV. The Intra-Mercurial Cameras and the Moving-PlateSpectrograph, Flint Island. A Total Eclipse of the Sux 71 adjustments which make the difference between good andexcellent results and the rehearsal. The duration of totality was 3™ 52^; to utilize those preciousseconds to the utmost, it was essential that every one should beso famihar with his particular duties that he would performthem mechanically^ with precision and the maximum meant rehearsal and dress rehearsal, so to say, at example; the program for the 40-foot telescope called forsix photographs with exposure times ranging from 4® to 64^,the short exposures to record the bright inner corona, the longone, the faint outlying streamers. At each rehearsal, and therewere many, the observer at this instrument had all six plate-holders at hand, put each in position in its order, went throughthe motions of exposing the plate, stopping the exposure, andputting the next plate in position, while another ob
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
