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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 29

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[page]25[/page] II Equatorial Interval of Transit Instrument, value of in time. It not infrequently occurs in taking an observed transit of a star for the determination of time or error of click that owing to the intervention of clouds or accident, it is impossible for the observer to note the presage of the star across any of the wires of the instrument except some of what may be designated as the first or second half of the transit; or wires may be taken upon one side of the center wire, while the corresponding ones upon the opposite side are not. Such imperfect transits to be of any value must have the
 
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