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 28

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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 28

the stride level and 2.75N for the alidade level. Hence in the motion of the level bubbles from south to north, the bubble of the stride level traverses (4.5+5) divisions of its scale while the bubble of the alidade level traverses (4.25+2.75) divisions of its scale. Therefore 9.5 divisions of the scale = 7 divisions of the alidade level and 1 divisions of the stride level = 7/9.5 divisons of the alidade. But one division of the alidade level equals e" [?]. Therefore one division of the stride level equals 7e"/9.5. The operation should be repeated several times as in the example following. 
Instead of computing "Means" and "Differences" as soon as the bubbles are read, put the bubbles in their next positions for reading so that they can be coming to rest while the computations are being made. 
The term "Difference" has the same meaning as in the comparison of the alidade level with the vertical circle.

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the stride level and 2.75N for the alidade level. Hence in the motion of the level bubbles from south to north, the bubble of the stride level traverses (4.5+5) divisions of its scale while the bubble of the alidade level traverses (4.25+2.75) divisions of its scale. Therefore 9.5 divisions of the scale = 7 divisions of the alidade level and 1 divisions of the stride level = 7/9.5 divisons of the alidade. But one division of the alidade level equals e" [?]. Therefore one division of the stride level equals 7e"/9.5. The operation should be repeated several times as in the example following. Instead of computing "Means" and "Differences" as soon as the bubbles are read, put the bubbles in their next positions for reading so that they can be coming to rest while the computations are being made. The term "Difference" has the same meaning as in the comparison of the alidade level with the vertical circle.