Two (2) types of compass survey
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In compass survey , the direction of the survey line is measured by the use of a magnetic compass while the lengths are by chaining or taping. Where the area to be surveyed is comparatively large, the compass survey is preferred, whereas if the area is small in extent and a high degree of accuracy is desired, then chain survey is adopted. However, where the compass survey is used, care must be taken to make sure that magnetic disturbances are not present. The compass the two major primary types of survey compass are: the prismatic compass and surveyors compass Prismatic Compass Invented in 1814, the prismatic compass consists of a small circular box of about 100m. It can either be used as a hand instrument or mounted on a tripod; and is very useful in a situation where rough surveys are needed i.e. where the accuracy of the survey is not the main consideration but the speed. The main parts of a prismatic compass are: compass box, lifting lever, needle, Agate cap, G...