While creating a house or any other structure, it becomes imperative that it comes up straight. While laying bricks, corner ones are used as finders of its straight quotient. From there, masons throw down their plumb lines with a top like base and if the line is symmetrical with first few brick layers, they assume that structure is pretty vertical.

Its string is big enough to make out horizontal straightness as well. It is quite a primitive instrument and generally workable only in the initial stage, but it is given that if base is straight, the upper floors won’t be hard to discern if they go astray. It can also be used to find the height of mountains and other tall structures, provided the string is large enough to encompass the structure.

Its basic job is to align walls and the place from where they will start. With some space left for plinth-pillar joints, its usage comes out well.

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