In 1960 the magnetic bearing of a line OA was N 18 15' W, the secular variation per year is 004 E and the declination of the needle was 145'E. Determine the magnetic bearing of line OA in 1979. O N 18°44' W O N 15°14' W O N 21°16' W O N 17°46' W

In 1960 the magnetic bearing of a line OA was N 18 15' W, the secular variation per year is 004 E and the declination of the needle was 145'E. Determine the magnetic bearing of line OA in 1979. O N 18°44' W O N 15°14' W O N 21°16' W O N 17°46' W

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Control Survey and Geodetic reductions

Control surveys or survey controls are used to establish reference points as a basis for various construction activities. Vertical and horizontal control points are to be established in a control survey to increase accuracy. After establishing the control points, all other types of surveys such as topographic, right-of-way, aerial mapping, construction layout, boundary surveys, and utility mapping can be worked upon so that control networks can be formed. The place from which the observations are made is called a survey station.

Question

In 1960 the magnetic bearing of a line OA was
N 18 15' W, the secular variation per year is
004 E and the declination of the needle was
145'E. Determine the magnetic bearing of Line
OA in 1979.
ON 18°44' W
O N 15°14' W
O N 21°16' W
O N 17°46' W
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