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 23

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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 23

one half the difference of the south readings as well as by the left side of the foregoing equations, this number is put into a column headed "Differences". After five numbers have been put into the difference column, read the circle and record the reading. Ass the five numbers in the difference column. The sum given the number of divisions corresponds to the number of seconds of [arc?] thru which the zero of the circle has passed. Let M- the number of division of the level corresponding to M'', say, of [arc?]. Then the value of one division is M''/M.
Try to get different readings for each end of the bubble, i.e. not two or three readings alike in succession, but keep the middle of the bubble away from zero and don't [?>] the bubble off the scale. The foregoing process of finding the value of a division of the lebel [?] be repeated until several circle readings have been taken. See example following.

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one half the difference of the south readings as well as by the left side of the foregoing equations, this number is put into a column headed "Differences". After five numbers have been put into the difference column, read the circle and record the reading. Ass the five numbers in the difference column. The sum given the number of divisions corresponds to the number of seconds of [arc?] thru which the zero of the circle has passed. Let M- the number of division of the level corresponding to M'', say, of [arc?]. Then the value of one division is M''/M. Try to get different readings for each end of the bubble, i.e. not two or three readings alike in succession, but keep the middle of the bubble away from zero and don't [?>] the bubble off the scale. The foregoing process of finding the value of a division of the lebel [?] be repeated until several circle readings have been taken. See example following.