DIY History | Transcribe | Scholarship at Iowa | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903 | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 31

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Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903

Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 31

Method of Using the Stride Level
Suppose the [?] of the readings to be in the center of the scale. If the level were in perfect adjustment the inclination of the axis of the transit instrument would be given in divisions of the level by taking one half the difference of the west and east readings i.e by w-e/2; e.g if the level reads 10W and 19e the inclination of the axis in 4 divisions in favor of the east end. 
However, suppose that on account of imperfect adjustment of the level the center of the bubble so not at zero when the level rests upon a horizontal surface, but is at a distance of c divisions to one side. Then the readings of the level when it is applied to the axis of the transit instrument will be w+c for the west end and e-c for the east, in one position; and w-c for the west and e+c for the east in the reverse position
Let [?]W be the sum of the readings for the west end of the bubble and [?]E the sum for

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Method of Using the Stride Level Suppose the [?] of the readings to be in the center of the scale. If the level were in perfect adjustment the inclination of the axis of the transit instrument would be given in divisions of the level by taking one half the difference of the west and east readings i.e by w-e/2; e.g if the level reads 10W and 19e the inclination of the axis in 4 divisions in favor of the east end. However, suppose that on account of imperfect adjustment of the level the center of the bubble so not at zero when the level rests upon a horizontal surface, but is at a distance of c divisions to one side. Then the readings of the level when it is applied to the axis of the transit instrument will be w+c for the west end and e-c for the east, in one position; and w-c for the west and e+c for the east in the reverse position Let [?]W be the sum of the readings for the west end of the bubble and [?]E the sum for