2. In 1960 a line XY had a magnetic bearing of N 80°23' E. At that time the magnetic declination was 3°45' west.. In a new survey performed in 1987, the declination in the same locality changed to 2050' east, determine the magnetic bearing and true bearing of the line based on the new survey.
2. In 1960 a line XY had a magnetic bearing of N 80°23' E. At that time the magnetic declination was 3°45' west.. In a new survey performed in 1987, the declination in the same locality changed to 2050' east, determine the magnetic bearing and true bearing of the line based on the new survey.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2. In 1960 a line XY had a magnetic bearing of N 80°23' E. At that time the magnetic
declination was 3°45' west. In a new survey performed in 1987, the declination in the
same locality changed to 2o50' east, determine the magnetic bearing and true bearing of
the line based on the new survey.
3. The following are the observed data for an open compass traverse. Adjust the
observed directions and tabulate values accordingly.
OBSERVED BEARING
FORWARD
LINE
LENGTH
BACKWARD
AB
BC
CD
DE
EF
FG
462.50m
405.65m
495.08m
284.15m
367.29m
217.73 m
S 40 25' W
S 55°40' W
N 36°15' W
N 73°10' W
S 44 45' W
S 20°30' E
N 40°30' E
N 55°50' E
S 35°55' E
S 73 30' E
N 44°45' E
N 21°00' W
4. The following are the observed lengths and magnetic bearings of a closed compass
traverse. Adjust the observed directions of each line and tabulate values accordingly.
74
02 15"
26 50'
60
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