 Dumpy level in use on a construction site A dumpy level, builders auto level, leveling instrument or automatic level is an instrument used in surveying and building to transfer, measure, or set horizontal levels. Image File history File links Petty Officer 3rd Class Alexander Sanchezaguirre, an engineering aide with Naval Mobile Construction Battalion 5, takes a land survey of an AH1 and CH-53 helicopter staging area for future operations in the Central Command area of operations. ...
Image File history File links Petty Officer 3rd Class Alexander Sanchezaguirre, an engineering aide with Naval Mobile Construction Battalion 5, takes a land survey of an AH1 and CH-53 helicopter staging area for future operations in the Central Command area of operations. ...
Surveyor at work with a leveling instrument. ...
Cranes are essential in large construction projects, such as this skyscraper In project architecture and civil engineering, construction is the building or assembly of any infrastructure. ...
Turkish Level, January 2006 LeveL is a magazine about computer and video games in Turkey and the Czech Republic; these two brother divisions occasionally exchange content. ...
It is an instrument that is set up on a tripod and, depending on the type, either roughly or accurately set to a leveled condition. One operator looks through the sight while the other holds a tape measure or graduated staff at the position to be measured. They are used to gather and/or transfer elevations (or levels) during site surveys or building construction. They generally start from a reference point known as a benchmark, this may be a value from a known survey point, or an arbitrary point used as a once off. Look up tripod in Wiktionary, the free dictionary. ...
A benchmark is a point of reference for a measurement. ...
A dumpy level is an older style instrument that requires skilled use to set accurately. The instrument requires to be set level (see spirit level) in each quadrant, to ensure it is accurate through a full 360 ° traverse. A spirit level is an instrument designed to indicate whether a surface is level. ...
A variation on the dumpy and one that was often used by surveyors, where greater accuracy and error checking was required, is a tilting level. This instrument allows the telescope to be effectively flipped through 180 °, without rotating the head. The telescope is hinged to one side of the instruments axis, flipping it involves lifting to the other side of the central axis (thereby inverting the telescope). This action effectively cancels out any errors introduced by poor setup procedure or errors in the instruments adjustment. As an example, the identical effect can be had with a standard builders level by rotating it through 180 ° and comparing the difference between spirit level bubble positions. A spirit level is an instrument designed to indicate whether a surface is level. ...
An automatic level, or builders auto level, involves an internal mechanism (a swinging prism) that once set close to level, will automatically compensate for any slight, remaining variation. This cancels the need to set the instrument truly level, as with a dumpy or tilting level. They are now the preferred instrument on building sites, construction and surveying due to ease-of-use and rapid setup time. See: Prism (geometry) Prism (optics) Prism (band) PRISM is an abbreviation for Probabilistic Symbolic Model Checker PRISM was an aborted RISC processor effort at DEC, see DEC PRISM This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ...
The term dumpy level endures despite the evolution in design.
See also An optical theodolite, manufactured in the Soviet Union in 1958 and used for topographic surveying. ...
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