Line Ranger is an optical instrument used in surveying for ranging.
It is used in the process of locating an intermediate point in a straight line between two endpoints of the survey line.
1.1. The working mechanism of Line Ranger in Surveying
Line Ranger is a lightweight instrument consisting of two right-angled isosceles prisms(plane mirrors) placed one above the other and one sight vane such that the surveyor can see the image formed on the prism.
The upper prism is movable and can be adjusted while the lower prism is fixed. Diagonals of the prism are silver coated such that they reflect incident ray.
It is mostly used in direct ranging.
It eliminates the requirement of two persons in ranging. (A single person can easily perform ranging work with this instrument.)
The rate of line ranger instruments varies between 12$ to 50 $ in the USA and Rs1,000 to Rs 5,000 in India.
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