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The Annual Report of the President of Harvard University to the Overseers on the State of the University for the Academic Year
The Annual Report of the President of Harvard University to the Overseers on the State of the University for the Academic Year Author:Harvard University General Books publication date: 2009 Original publication date: 1908 Original Publisher: University Press Subjects: Education / Higher Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to ... more »Million-Books.com where you can select from more than a million books for free. Excerpt: Boyden Department. The Arequipa station has remained in charge of Mr. R. H. Frost, the senior assistant there. The number of photographs taken during the year, with the 13-inch Boyden Telescope, is 429, making 11,847 in all; with the 8-inch Bache Telescope, 961, making 38,224. The total number of stellar photographs taken during the year is 2,719. The Bache Telescope, which was sent to Cambridge for repairs, was returned to Arequipa, remounted, and the first photograph was taken with it on April 20, 1907. The number of settings with the meridian photometer was 1,784; with the Rumford photometer, 2,316; with the double-star photometer, 736; total, 4,836. 317 observations have also been made, of 50 southern variables of long period. Meteorological observations, three times a day, have been continued as in former years, and visual observations of the cloudiness have been made hourly throughout the year. Bruce Photographic Telescope. The number of photographs taken with the 24-inch Bruce Telescope was 372, of which 45 are spectrum plates, and 61 are charts having exposures of one hour, or more. The total number of photographs so far taken with this instrument is 8,514. These plates continue to be the most valuable in the observatory, for the study of very faint objects. The large scale also renders them very useful when accurate positions are to be determined. This instrument, as well as some of the smaller instruments, is used for the determination of photographic magnitudes, by photographing two regions on the same plate, under precise...« less