line of collimation
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line of collimation[′līn əv ‚käl·ə′mā·shən]
In a surveying telescope, the imaginary line through the optical center of the object glass and the cross-hair intersection in the diaphragm.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
line of sight, line of collimation
The line extending from an instrument along which distant objects are seen, when viewed with the telescope or other sighting device. Also see sight line.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.