As its name implies, a plumb bob is used to check a vertical surface—-such as a door, wall, or window—-for plumb, or to find a spot directly below any given point. It is a simple but very accurate tool consisting of a tapered weight attached to a string. It’s really easy to use, too. To find plumb below a spot on a ceiling joist, for example, hold the string to a point on a joist and extend the string so that the weight is close to the floor (see the photo on the facing page). Plumb is directly below the point of the weight.
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