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Theory of least squares applied to the problems arising in our observatory by Arthur George Smith, 1895

Theory of Least Squares Applied to the Problems Arising in our Observatory by Arthur George Smith, 1895, Page 5

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[[page#]]1[[/page#]] I Azimuth Screw of Transit Instrument, determination of the value of one revolution of. The problem, of the determination of the value in arc and time of one revolution of the azimuth screw of the transit instrument, was treated in the following manner. A small circle of about four inches diameter and containing a small cross was drawn upon the wall of a brick building at a distance of about 300 feet from the pier of the transit Instrument. The instrument, with circle facing east, was turned until the middle wire, D3, [See cut of transit reticule, page 24] bisected the
 
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