Collimator vertical
Collimator vertical a telescope so mounted that its collimation axis can be made to coincide with the vertical or direction of plumb-line the vertical collimator serves as an optical plumb-line, and may be designed for use in placing a mark on the ground directly under an instrument or in centering an instrument directly over a mark on the
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
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