A transit is set up at point B which is between A and B. The vertical angle observed towards A is known to be -20° and that of C is +12°. The horizontal distance between A and B is 642.80 m and that of B and C is 1032.40 m. The height of instrument is 1.5 m above B with A having an elevation of 146.32 m. Considering the effect of curvature and refraction correction. a) Compute the difference in elevation between A and B. b) Compute the difference in elevation between A and C. c) Compute the elevation of B.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Problem 2.
A transit is set up at point B which is between A and B. The vertical angle observed
towards A is known to be -20° and that of C is +12°. The horizontal distance between A
and B is 642.80 m and that of B and C is 1032.40 m. The height of instrument is 1.5 m
above B with A having an elevation of 146.32 m. Considering the effect of curvature and
refraction correction.
a) Compute the difference in elevation between A and B.
b) Compute the difference in elevation between A and C.
c) Compute the elevation of B.
Transcribed Image Text:Problem 2. A transit is set up at point B which is between A and B. The vertical angle observed towards A is known to be -20° and that of C is +12°. The horizontal distance between A and B is 642.80 m and that of B and C is 1032.40 m. The height of instrument is 1.5 m above B with A having an elevation of 146.32 m. Considering the effect of curvature and refraction correction. a) Compute the difference in elevation between A and B. b) Compute the difference in elevation between A and C. c) Compute the elevation of B.
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