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What is a plumb-bob used for?

A plumb-bob is a simple tool that is used to establish whether something is “plumb” (exactly vertical).

 

When the string is attached to a static object and the plumb-bob weight is suspended below, the laws of gravity will ensure that the string is both vertical and perpendicular to any horizontal plane through which it passes.

Common uses for plumb-bobs

Checking for plumb

A plumb-bob is a simple tool that is used to establish whether something is “plumb” (exactly vertical).

 

When the string is attached to a static object and the plumb-bob weight is suspended below, the laws of gravity will ensure that the string is both vertical and perpendicular to any horizontal plane through which it passes.

Transferring points from floor to ceiling

A plumb-bob can be used to mark a point directly above or below another point. This is particularly useful, for example, when you need to transfer points from a floor layout plan to a ceiling joist, or hanging an interior door.

Hanging wallpaper

A plumb-bob can simply be used to create an accurate vertical reference line prior to hanging wallpaper.