horizontal axis

horizontal axis

The axis (line) about which the telescope or alidade of an instrument rotates when rotated in a vertical plane. For an instrument in perfect adjustment, it is perpendicular to the standing axis of the instrument and to the collimation axis of the telescope. It should coincide with the line through the centers of the pivots that support the telescope. For an instrument in perfect adjustment and properly leveled, this axis is horizontal; when the telescope is rotated around it, the collimation axis will define a vertical plane. Deviations from proper instrumental adjustment are measured with a striding level or a hanging level.

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Industry/Domain: Earth science
Category: Mapping science
Company: American Congress on Surveying & Mapping
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