Question

The following reciprocal observations were made from two points P and Q.
Horizontal distance between P and Q = 6996m.
Angie of elevation of Q at P= 1°50 10".
Angle of depression of P at Q = 1°56'52".
Hieight of signal at P = 4,07 m.
Height of signal at Q = 3.87 m.
Height of instrument at P= 1.27 m.
Height of instrument at Q = 1.48 m.
Find the difference level between P and Q and the refraction correction.
Take Rsin 1" = 30.88 m.
Or​

Answer 1

Answer:

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