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 38

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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 38

determine the direction of the meridian, mark it upon the top of the pier or by an outside natural or artificial signal, and put the instrument in such a position that the telescope will swing as nearly as may be in the meridian. It should swing within five degrees of the meridian. The meridian may be determined with sufficient accuracy for this purpose by means of a compass needle, the magnetic declination being known and allowed for. All that is required is that the telescope shall be so nearly in the meridian that the final adjustment may be made by means of the screws provided upon the instrument for the azimuth adjustment.
     Having adjusted the level and the reticle, proceed to adjust the transit instrument itself, and make the adjustments in the following order:

1st. The adjustment for level.

2nd. The adjustment for collimation.

3rd. The adjustment for azimuth.

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determine the direction of the meridian, mark it upon the top of the pier or by an outside natural or artificial signal, and put the instrument in such a position that the telescope will swing as nearly as may be in the meridian. It should swing within five degrees of the meridian. The meridian may be determined with sufficient accuracy for this purpose by means of a compass needle, the magnetic declination being known and allowed for. All that is required is that the telescope shall be so nearly in the meridian that the final adjustment may be made by means of the screws provided upon the instrument for the azimuth adjustment. Having adjusted the level and the reticle, proceed to adjust the transit instrument itself, and make the adjustments in the following order: 1st. The adjustment for level. 2nd. The adjustment for collimation. 3rd. The adjustment for azimuth.