Inclined sight with tilted staff—error expression: If θ is the vertical angle of an inclined sight and δ is the angle of tilt of the staff from the vertical, the resulting error in the staff reading is best represented by which expression?
Civil Engineering
Surveying
Difficulty: Medium
Choose an option
-
Al (1 − cos δ) sec θ
-
Bl sin²(δ/2) sec θ
-
Cl tan θ sin δ
-
Dl (sec θ − sec(θ ± δ))
-
Enone of these
Answer
Correct Answer: l (1 − cos δ) sec θ