![]() This results in more accurate measurements and better-constructed structures, as both vertical and horizontal positions can be precisely determined. The position of the bob from the floor or a base surface can then be accurately measured, so structures can be plumb and in alignment. The bob is suspended from a string and when held perfectly vertical, the weight of the mercury causes the bob to settle to the lowest point possible. Mercury plumb bobs contain a tube filled with mercury and capped off with a sharp point at the end. It is traditionally used by carpenters, surveyors, and stonemasons to find the true vertical line when measuring or marking in the vertical plane. What is a mercury plumb bob used for?Ī mercury plumb bob is a device used to find the verticality or “plumb” of an object. Finally, plumb-bobs can easily be affected by wind or vibrations, which can lead to inaccurate measurements. As such, they can be impractical to use in large, open areas as a single user won’t be able to see the entire measurement area in one glance.Īdditionally, plumb-bobs may require a separate device, like a string or measuring tape, to be used to measure accuracy. ![]() ![]() Plumb-bobs are also time consuming and labor-intensive to use. This makes them prone to user error, especially when working with long distances. ![]() Plumb-bobs require a steady hand, as even the slightest movement often affects the accuracy of the measurement. Plumb-bobs have a few disadvantages when compared to other leveling tools like laser levels. ![]()
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