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. The plumb line in one place can be used to sight an object in another - a pipe, for example - for plumb. 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. The tool is also used in surveying, allowing the user to find nadir (the local vertical direction pointing towards gravity). Plumb bob has been around for thousands of years, dating back to Ancient Egypt. A spirit level will also accomplish those tasks, but some jobs are much more easily done using the tool. 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. The plumb bob is useful in establishing vertical for a wall in construction or a doorjamb when hanging a door. With their vertical, solid brass construction and. Hi, to attach the thread to the plumb bob you need to thread the cord through the central top hole so that it comes out of the side hole underneath the. (Note that the line must be hanging free to get an accurate reading.) The plumb consists of a specially designed weight and coarse string made of twisted cotton or nylon threads. 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. Go ahead and cut the string to the required length. Whatever length you measure, add an extra four or five inches to cover the pieces of string that you’ll lose when tying on the screwdriver and ring pull. To use the tool, the string is fixed at the point to be plumbed. The first step is to measure the height of wherever you’ll be using the plumb line.
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