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 39

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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 39

   The Adjustment for Level.

   To make the rotation axis horizontal, compute the number of divisions of the level by which the axis is out of level and make the adjustment with the foot-screws.

   The Adjustment for Collimation.

   The simplest way of making this adjustment is to direct the telescope to some small, well-defined and distant object like a nail-head and bisect it with the middle vertical wire. Then lift the telescope very carefully from its supports and replace it with the axis reversed. Point the telescope again to the same object, and if it be still bisected, the collimation adjustment is correct, if not, move the wires one half the error by turning the small adjusting screws. But as one half the error may not be correctly estimated in moving the wires, it becomes necessary to verify the adjustment by moving the telescope the other half. This is done by turning the azimuth screw of the [wye?]. Having again bisected the object, reverse the axis as before,

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The Adjustment for Level. To make the rotation axis horizontal, compute the number of divisions of the level by which the axis is out of level and make the adjustment with the foot-screws. The Adjustment for Collimation. The simplest way of making this adjustment is to direct the telescope to some small, well-defined and distant object like a nail-head and bisect it with the middle vertical wire. Then lift the telescope very carefully from its supports and replace it with the axis reversed. Point the telescope again to the same object, and if it be still bisected, the collimation adjustment is correct, if not, move the wires one half the error by turning the small adjusting screws. But as one half the error may not be correctly estimated in moving the wires, it becomes necessary to verify the adjustment by moving the telescope the other half. This is done by turning the azimuth screw of the [wye?]. Having again bisected the object, reverse the axis as before,