Dumpy level parts and functions pdf
Levelling in Surveying Using Dumpy Level » Engineering BasicThough these devices may look intimidating or confusing, dumpy levels are fairly easy to use once you know how to set them up and what kinds of measurements they provide. To use a dumpy level, start by placing an E staff on a spot you already know the height of. For tips on how to level and focus your device, read on! This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Together, they cited information from 13 references.
A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling , and is used in conjunction with a levelling staff to establish the relative heights levels of objects or marks. It is widely used in surveying and construction to measure height differences and to transfer, measure, and set heights of known objects or marks. It is also known as a Surveyors level, Builders level, Dumpy level or the historic "Y" level. It operates on the principle of establishing a visual level relationship between two or more points, for which an inbuilt telescope and a highly accurate bubble level are used to achieve the necessary accuracy. Traditionally the instrument was completely adjusted manually to ensure a level line of sight, but modern automatic versions self-compensate for slight errors in the coarse levelling of the instrument, and are thereby quicker to use. The optical level should not be confused with a theodolite which can also measure angles in the vertical plane.
Surveying is a very important part of civil engineering. Knowledge of surveying is incomplete without the knowledge of leveling. The dumpy level is a commonly used leveling instrument. To be acquainted with this leveling instrument and learn how to operate it one should read the following article carefully. The dumpy level is an optical surveying leveling instrument consisting a telescope tube firmly secured in two collars fixed by adjusting screws to the stage by the vertical spindle. The telescope of dumpy level can rotate only in a horizontal plane.