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An attachment placed on a surveyor's transit to measure angle of inclination in terms of the tangent of the angle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An attachment to an engineer’s transit with which an angle of inclination is measured in terms of the tangent of the angle, rather than in degrees and minutes.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.