Exercise 19

Ex.19-1 Tabulate the differences between different types of meridians along with differences in their utilities.

Ex.19-2 What is magnetic declination ?

Ex.19-3 The magnetic bearing of a line was found to be N 60° 30' W in 1992, when the declination was 5° 10' E. find its present magnetic bearing, if declination is 3° W.

Ex.19-4 The bearing taken for two lines are as follows:

Line
Fore Bearing
Back Bearing
AB
S 37° 30' E
322° 30' (WCB)
BC
223° 15' (WCB)
N 44° 15' E

Compute the interior angle at B.

Ex.19-5 Following are the observed magnetic bearings of the traverse legs:

Line

PQ

QR

RS

SP

FB

74° 20'

107° 20'

224° 50'

200° 15'

BB

256° 00'

286° 20'

44° 50'

126° 00'

At what stations local attraction is suspected? Determine the correct bearings of the traverse legs and also calculate the included angles.

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