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 49

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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 49

star at least two or three minutes before it is due to cross the middle wire. Having set the telescope, watch the clock so as to know when to expect the star to appear in the field of view.

   Effects of the Errors of Adjustment of the Transit Instrument upon the Time of Transit.

"The final test of all the adjustments and of the accurate going of the clock is obtained by observing a number of Almanac stars of widely different declination. If they all indicate identically the same clock correction, the instrument is in adjustment; if not and if the differences are not very great, it is possible to deduce from the observations themselves the true clock error, and the adjustment errors of the instrument. The astronomer can never assume that adjustments are perfect. Even if once perfect they would not stay so, on account of changes in temperature and other causes. Nor are observations ever absolutely accurate. The problem is then to find the result that would have been

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star at least two or three minutes before it is due to cross the middle wire. Having set the telescope, watch the clock so as to know when to expect the star to appear in the field of view. Effects of the Errors of Adjustment of the Transit Instrument upon the Time of Transit. "The final test of all the adjustments and of the accurate going of the clock is obtained by observing a number of Almanac stars of widely different declination. If they all indicate identically the same clock correction, the instrument is in adjustment; if not and if the differences are not very great, it is possible to deduce from the observations themselves the true clock error, and the adjustment errors of the instrument. The astronomer can never assume that adjustments are perfect. Even if once perfect they would not stay so, on account of changes in temperature and other causes. Nor are observations ever absolutely accurate. The problem is then to find the result that would have been