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 40

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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 40

and if half the error was correctly estimated, the object will be bisected when the telescope is directed to it. If this is found not to be the case, one half the remaining error must be corrected as before and the operations must be continued until the object is found to be bisected in both positions of the axis. The adjustment will then be complete and the reticle [reticule?] should be clamped in position.

The Adjustment for Azimuth.

   The adjustment must be made by means of observations upon the stars.
   (a) By looking at the pole star, and remembering how the pole itself lies with reference to it one can easily set the instrument pretty nearly right, i.e. within half a degree or so. The line of collimation will now describe in the sky a vertical circle which crosses the meridian at the zenith and lies very near the meridian for a considerable distance each side of the zenith.
   (b) We must next get an approximate time;

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and if half the error was correctly estimated, the object will be bisected when the telescope is directed to it. If this is found not to be the case, one half the remaining error must be corrected as before and the operations must be continued until the object is found to be bisected in both positions of the axis. The adjustment will then be complete and the reticle [reticule?] should be clamped in position. The Adjustment for Azimuth. The adjustment must be made by means of observations upon the stars. (a) By looking at the pole star, and remembering how the pole itself lies with reference to it one can easily set the instrument pretty nearly right, i.e. within half a degree or so. The line of collimation will now describe in the sky a vertical circle which crosses the meridian at the zenith and lies very near the meridian for a considerable distance each side of the zenith. (b) We must next get an approximate time;