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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 79

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[page]74[/page] by which the movable lacks of coincidence with the fixed wire is termed the [underlined]index error[/underlined] and is from its nature a constant. Every observation made has, then, entering into it this constant index error: then each of a series of observed intervals taken as above described gives one observation equation for the determination both of the index error and the value of a revolution of the screw. The general form for these equations will be Ar + z = i ; where A is a constant and expresses the number of revolutions of the screw entering the observed interval, r the value in arc
 
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