Explain how will you overcome the obstacles over river during chaining operation.

Explain how will you overcome the obstacles over river during chaining operation.
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1 Answer

Answer :

A) river across the chain line.

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1. Suppose AB is the chain line. Two points C & D are selected on this line on opposite banks of the river.

2. At C a perpendicular CE is erected and bisected at F. A perpendicular is set out at E and a point G is so selected on it that

D,F & G are in The same straight line.

 3 From triangles DCF & GEF,

 GE=CD

 This distance GE is measured and thus the distance CD is obtained indirectly.

OR

B) river across the chain line

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1.Suppose AB is the chain line. Points C , D & E are selected on this line such that D & E are on opposite banks of the river.
2. The perpendicular DF & CG are erected on the chain line in such way that E,F& G are on the same straight line. The line FH is taken parallel to CD.
3.Now, from triangles DEF & HFG,
 ED/DF = FH/HG                Where FH=CD
 ED = (FH/HG ) X DF          CH=DF
 = (CD/(CG-DF) )X DF        HG=CG-CH

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