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 another and one sight vane such that surveyor can see the image formed on the prism.
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.)
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