The top of the mast signal 1750m away was sighted through a transit with recorded vertical angle of 4° 55'. The height of the mast is 5.5m and the height of the instrument above the point where it was set up is 1.15m. the elevation of the base of the signal 'B' is 167.23m, compute the elevation of the point under the transit 'A' with allowance due for curvature and refraction using h= 0.067k
The top of the mast signal 1750m away was sighted through a transit with recorded vertical angle of 4° 55'. The height of the mast is 5.5m and the height of the instrument above the point where it was set up is 1.15m. the elevation of the base of the signal 'B' is 167.23m, compute the elevation of the point under the transit 'A' with allowance due for curvature and refraction using h= 0.067k
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. Two hills are in 120km apart the higher is at the 325.7 m and the lower hill at elevation of
72m. Find the minimum height of tower on top of the higher hill that can be seen from the
lower hill?
2. Determine how far out to sea a boat will be when a light on its mast is 22m above the water
disappear from the sight of a man on shore whose eye level is 1,7m above sea water. Disregard
the effects of tides and waves.
3. The top of the mast signal 1750m away was sighted through a transit with recorded vertical
angle of 4° 55'. The height of the mast is 5.5m and the height of the instrument above the point
the base of the signal 'B' is 167.23m, compute the
elevation of the point under the transit 'A’ with allowance due for curvature and refraction using
where it was set up is 1.15m. the elevation
h= 0.067k2
4. Find the equal height of towers at triangulation stations A and C so that line AC will clear the
elevated ground between A and C by 6m. with the instrument set at point B, the observed
vertical angle to ground station A is 0°55' and the vertical angle to ground
station C is 0•48'.
Elevation of A is 237m. Distance AB is 10km and distance of BC is 8.7km. Yhe instrument set-up
at B is 2.7m above the ground. Use hcr= 0.067k?
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