plumb bob

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Related to plumb bobs: plumb line

plumb bob

[′pləm ‚bäb]
(engineering)
A weight suspended on a string to indicate the direction of the vertical.

plumb bob, plummet

A shaped metal weight which is suspended from the lower end of a line to determine the vertical. (See illustration p. 744.)
References in periodicals archive ?
The Constructor 50, 55 and 100 are a complete line of construction site layout and data collection solutions that simplify the layout process by eliminating the need for using measuring tapes, plumb bobs, theodolites or separate distance measuring equipment -- giving the general contractor more control and better accuracy on the jobsite.
The PLS product line includes laser line levels, laser plumb bobs, rotary lasers, laser detectors, optical levels, tripods, and grade rods.
The company specializes in the sale of laser levels and laser level accessories of all types including rotary lasers, laser line levels, laser plumb bobs, laser distance meters, laser detectors, torpedo lasers, laser level tripods, grade rods and now automatic levels.