1. Assume the magnetic bearing of line AB read in 1878 was N26°15′E. The declination at the time and place was 7°15′W. In 2000, the declination was 4°30′E. Determine the magnetic bearing in 2000
1. Assume the magnetic bearing of line AB read in 1878 was N26°15′E. The declination at the time and place was 7°15′W. In 2000, the declination was 4°30′E. Determine the magnetic bearing in 2000
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Write the complete solution and illustration.
1. Assume the magnetic bearing of line AB read in 1878 was N26°15′E. The
declination at the time and place was 7°15′W. In 2000, the declination
was 4°30′E. Determine the magnetic bearing in 2000.
2. In a compass survey mode 50 years ago the observed magnetic bearing
of a reference line XY was S50°18’E when the magnetic declination was
8°15’ East. Lately in 1986, a new survey was made and the declination in
the same survey site changed to 12°10’ West. Determine the following
descriptions of line XY:
a) Its true bearing
b) The azimuth from north and south
c) Its new magnetic bearing
d) The magnetic azimuth from south in 1986.
3. Convert the following azimuths to equivalent bearings AZn BC = 122°46’.
4. Compute the angle COD from the following set of
lines whose magnetic bearings are given: OC, N 34°14’ E and OD, N 53°
22’ W
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