plumb
[pləm] (engineering)
Pertaining to an object or structure in true vertical position as determined by a plumb bob.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Plumb
Any method of lining up the building elements in a true vertical direction.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
plumb
Exactly vertical.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Plumb
a device for centering a theodolite above marked points in the instrument leveling head or for elevating points when measuring the lengths of lines and angles. Plumbs include the plumb bob, a conical weight suspended on a string; the rigid plumb, a telescoping rod with a point at the end mounted perpendicularly to a level; and the optical plumb, a field glass whose collimator is also mounted perpendicularly to a level. Plumbs are also used in building construction, excavation work, and elsewhere.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.