Explain with neat sketch the procedure of reciprocal ranging.

Explain with neat sketch the procedure of reciprocal ranging.
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Answer :

Reciprocal ranging / Indirect ranging

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Procedure: Let A and B be two survey stations. They are not mutually visible due to high ground between them. Let two assistant stands at M1 and N1 as shown in fig. The assistant at M1 can see both the ranging rods at N1 and B, and assistant at N1 can see the ranging rod M1 and A. Now assistant at N1 directs M1 in line AN1, M2 be the new position of M1 on line N1A. The assistant on M2 directs the N1 on line M2B and N2 be the new position of N1. M2 and N2 be the new position of M1 and N1 which are nearer to line AB. Repeat same process until points M and N are established. 

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