plumb bob


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Related to plumb bob: 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 ?
Ultrasonics depend on the speed of sound, which varies, while the plumb bob system is mechanical.
The plumb bob and mule operators noticed the unsafe situation and told the team to lock down all jack collars to prevent any further movement of the aircraft.
I realised when the chimney approached the rafters' height, that I had not located my plumb bob correctly, due to a nice glass of red wine on the day of placing the plumb bob early in the kiln construction process.
He'd take a Polaroid picture of his patient standing behind the plumb bob on a string in a standardized position.
Start by getting all your equipment together, which will include wallpaper paste, bucket and wide brush, paper-hanging scissors and sponge, pasting table, plumb bob or spirit level, steel ruler and pencil, steps, tape measure and a trimming knife.
Another dowsing tool is the pendulum, a simple weighted object on a short string or chain, such as a mason's plumb bob. Pendulums are often used to ask informational questions of the body, such as nutrient or food supplement needs.
The remodelers dropped a plumb bob from where the stove's chimney hood would exit through roof joists and Lori Bentley designed the island around that space.
At the correct measurement on the tape, lower a plumb bob to obtain the desired location on the ground.
In mounting a scope, I like to use a carpenter's square to get the action level, and a plumb bob to align the vertical crosshair.
When perpendicular at the sole/ table axes is reestablished the examiner drops an imaginary plumb line from the anterior face of the patella (line 3), parallel to the table, down to the "ground" (line 1), and notes at which site on or distal to the foot the plumb bob "touches." This site is noted, and might be toe tips, or 4 cm distal to toe tips, or 6 cm proximal to toe tips, and so forth.
The centerpiece of this assemblage is Parks' plumb bob (a tool to determine a straight line), bits of the construction site and parts of his blueprint for the dwelling.
With stakes, line level and plumb bob, dig soil surface at corners and at midpoint of long sides so hole bottoms are all on the same level plane.