The procedure of surveying on Dumpy Level: Steel shoes provided at the foot ensures that the tripod is immobile with slight jerks. Comprising of three legs made of hollow steel sections or light or hardwood. Tripod is the supporting medium of the complete dumpy level. Levelling HeadĪlso known as a trivet, it comprises of two triangular plates aligned parallel to each other. To ensure the bubble is at the centre, foot screws are operated. Adjusting foot screws one can calibrate tribrach plate. The foot screws are used to calibrate the instrument through the bubble tube. The trivet is connected through foot screws. It is parallel to the levelling head and primarily utilised to adjust the horizontal level of the instrument. Vertical Spindle is meant to be a conjunction point between tripod and telescope. It helps the telescope to rotate in the vertical direction. The compass is aligned for the magnetic bearing in the north direction. The compass comprises of pointer on marking of directions. It is used to determine the magnetic bearing of the line of the path of the survey. The instrument is ready to survey when both the bubbles are in the centre. Provided by bubble tubes on horizontal and vertical direction. They are provided to align the level of instrument. Ray Shade: Prevents sunlight from entering the objective lens.Focusing Screw: They are meant to align the focus and image clarity of the object.Diaphragm: Provided in the outline of the eyepiece with the cross of dark metal.It comprises a convex lens and a concave lens. Objective Piece: it is placed at the farther end of eyepiece.Eye Piece: It comprises of a magnifying glass and is primarily used by the observer.The level of accuracy and handiness of dumpy level has made it a prominent choice amongst surveyors. The accuracy of a dumpy level can be within 1:4000 for every 100 m.ĭumpy level holds significant importance in the surveying of a construction site. The prime reason for using Dumpy level over other levelling instruments is its accuracy.Ī dumpy level is known for high accuracy values for most of the Tacheometric methods. Accuracy of Dumpy level over other levelling instruments: It is also called through various names such as Surveyors levels, Builders level, Dumpy level or even its pre-historic version “Y(Wye) Level”. The desirable level of accuracy can be achieved through steps. The dumpy level operates on the principle by establishing a visual relationship between two or more points, through an inbuilt telescope and a bubble level. Precautions while setting up Dumpy level:.Height of the Instrument (H.I.) or Height of the Level:.The procedure of surveying on Dumpy Level:.Accuracy of Dumpy level over other levelling instruments:.
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