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Use of Plum, level tube and spirit level

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Rural Technology

In any type of construction, accurate measurement of construction is most importance. It is necessary to maintain the right angle direction. Tools used in construction are discussed here.

1) Plumb – bob A plumb is a weight, usually with a pointed tip on the bottom that is suspended from a string. It is used as a reference line for leveling vertical length. Ref fig 6.5(a) Mesons used this method to ensure that their constructions are perfectly upright 2) String Line You must have seen meson using string for laying bricks of foundation. A line is described by two points, the start point and the end point, and the shortest distance between two points is a straight line. A mason uses a string line between two points (nails or line blocks etc.) and he pulls the line tight to get it the shortest distance, to make it straight, with no sag. He takes this string as a reference to complete his work. 3) Spirit level It is used to check the horizontal level of construction. The bubble in the tube should be at the center to make the level horizontal. Ref. fig 6.5(b) 4) Water tube To check all points of wall are at same level, a simple water tube is used. It uses the simple principle of ‘water remains at the same level’. Intext questions 6.3 Match the following: A B i) Spirit level leveling horizontal level ii) Plumb Cooler houses iii) Rat trap bonds Single brick wall iv) Spanish bond Leveling vertical length v) Stretcher bond bearing wall

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Rural Technology