Line of collimation

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the axial line of the telescope of an astronomical or geodetic instrument, or the line which passes through the optical center of the object glass and the intersection of the cross wires at its focus.

See also: Collimation

References in periodicals archive ?
Repairing & Servicing of Autolevels (Temporary adjustment (Level screw, tribach plate & trivet plate), Permanent adjustment, Line of collimation, Line of sight, Visibility of cross hair on reticule, Focusing of eyepiece and objective lenses, Removal of parallax, Bubble in spirit level, Horizontal tangent screw, Focusing knob, Removal of zero error in horizontal circle gradation, Compensator mechanism (pendulum prism) etc)