![]() Some bobs have pointed tips that can be bent by repeated use or abuse if the point on yours is bent or out of alignment, replace it. Excavation and foundation contractors rely upon the plumb line, and constructing a chimney the tool can indicate whether a flue is running true vertical or veering off plumb. Surveyors sometimes use plumb bobs for lining up points or transferring them. It is our purpose here to show how this instrument was used to. The plumb line in one place can be used to sight an object in another - a pipe, for example - for plumb. plumb-bob level and a right angled square combined into a single instrument as shown. Once it is hung and still, the top and bottom points can be marked and used as guides. For example, you can locate fixtures or decorations in relation to an object or surface below (or above) using the plumb line. A spirit level will also accomplish those tasks, but some jobs are much more easily done using the tool. ![]() Plumb is the vertical equivalent to a spirit level. The plumb bob is useful in establishing vertical for a wall in construction or a doorjamb when hanging a door. This wooden plumb level from the tomb of Sennedjem consists of two short pieces projecting at right angles from a longer slab. A plumb bob is a pointed weight attached to the end of the string and is used to find a vertical reference line called plumb. (Note that the line must be hanging free to get an accurate reading.) The weight, or bob, is then allowed to swing freely when it stops, the point of the bob is precisely below the point at which the string is fixed above. To use the tool, the string is fixed at the point to be plumbed.
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