Prob. 2 Magnetic Declination. In a compass survey made fifty years ago, the observed magnetic bearing of a reference line XY was S 50°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: а. Its true bearing. b. The true azimuth from south. Its new magnetic bearing. С. d. The magnetic azimuth from south in 1986.
Prob. 2 Magnetic Declination. In a compass survey made fifty years ago, the observed magnetic bearing of a reference line XY was S 50°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: а. Its true bearing. b. The true azimuth from south. Its new magnetic bearing. С. d. The magnetic azimuth from south in 1986.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Prob. 2 Magnetic Declination. In a compass survey made fifty years ago, the observed
magnetic bearing of a reference line XY was S 50°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:
Its true bearing.
а.
b. The true azimuth from south.
Its new magnetic bearing.
С.
d. The magnetic azimuth from south in 1986.

Transcribed Image Text:MN2
TN
MNI
Magnetic Meridian 50 years ago
Magnetic Merldian in 1986
W
True Meridian
-Reference Line XY
MS, TS MS2
Given:
= 8°15' east, the magnetic declination 50 years ago
d2
12° 10'west , the magnetic declination in 1986
%3D
: $ 50°18' E, the observed magnetic bearing of Ilne XY fifty years ago.
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