Line Ranger Instrument in Surveying

Line Ranger is an optical instrument used in surveying to locate an intermediate point in a straight line between two endpoints.

✓ Line ranger is used for ranging work. It eliminates the requirement of two persons in ranging work. A single person can efficiently perform ranging work with this instrument.

1. 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 rays.

2. Use  

✓ It is mainly used in the ranging.

3. Advantage  

i. It eliminates the requirement of two persons in ranging work.

ii. It is lightweight, portable, and easy to carry.

iii. It is inexpensive, making it easy to afford.

iv. It is easy to use and requires no skill to operate.

  4. Rate  

✓ The rate of line ranger instruments varies between 20 $ to 60 $ in the USA and  Rs 1,000 to Rs 5,000 in India.

Read Also: Pegs in Surveying