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A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are mainly used for surveying applications, and have been adapted for specialized purposes in fields like metrology . A modern theodolite consists of a movable telescope mounted within two perpendicular axes — the horizontal or trunnion axis , and the vertical axis. When the telescope is pointed at a target object, the angle of each of these axes can be measured with great precision, typically to seconds of arc.
A contour is defined as an imaginary line of constant elevation on the ground surface. It can also be defined as the line of intersection of a level surface with the ground surface. For example, the line of intersection of the water surface of a still lake or pond with the surrounding ground represents a contour line. It facilitates depiction of the relief of terrain in a two dimensional plan or map. The process of tracing contour lines on the surface of earth is called contouring. A contour map gives the idea of the altitudes of the surface features as well as their relative positions in a plan CONTOURING BY INDIRECT METHOD: The points surveyed...
Breast wall are types of protection walls used in civil engineering works. Breast are used to protect the fresh cut of earth. There is always a confusion between retaining wall and breast wall. The Breast wall is built on the hill side of a Road as it protects the natural cut slope of Road. Retaining wall is built on the valley side of road. Breast has a small range of height nearly from 2 to 3 meters and retaining wall can have more height. Breast wall help in protecting the cut slope from further Erosion. Both breast walls and Retaining walls are used in hilly road constructions having steep slopes and it can also be used in Embankment to protect them from erosion. Breast wall can be constructed in plain Concrete or in Stone Masonry. In these photos we can see Breast walls being constructed in Stone masonry ...
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