Plumb(redirected from plumbness)
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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.