The top of a tower signal at B 2000 m from A away was sighted through a transit with recorded vertical angle of 2deg30’. The height of the mast is 12 m and the HI of the transit above the point where it is set is 1.10 m. The elevation of the point under the transit A is 133.3 m. Compute the elevation of the base of the signal B. Consider the effects of curvature and refraction.
The top of a tower signal at B 2000 m from A away was sighted through a transit with recorded vertical angle of 2deg30’. The height of the mast is 12 m and the HI of the transit above the point where it is set is 1.10 m. The elevation of the point under the transit A is 133.3 m. Compute the elevation of the base of the signal B. Consider the effects of curvature and refraction.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The top of a tower signal at B 2000 m from A away was sighted through a transit with recorded vertical angle of 2deg30’. The height of the mast is 12 m and the HI of the transit above the point where it is set is 1.10 m. The elevation of the point under the transit A is 133.3 m. Compute the elevation of the base of the signal B. Consider the effects of curvature and refraction.
Transcribed Image Text:Point A is between points Band C. The distances of B and C from point A are
1000 m and 2000 m, respectively. Measured from point A, the angle of elevation
of point B is 18deg30", while that of point C is unknown. The difference in the
elevations of B and C is 44.4 m, with C being lower than B. Considering the
effects of curvature and refraction, the value of unknown angle is nearest to:
6deg45'
5deg20'
8deg15'
7deg30'
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