81. In Quadrantal system back bearing of a line may be obtained from its forward bearing by . . . . . . . .
82. The most important line in the chain survey on which the triangular frame work of survey is built is called . . . . . . . .
83. Presamatic compass used in
84. In the absence of compass one of the following instrument can be used to set a line at 45°.
85. An example of natural error in prismatic compass survey is . . . . . . . .
86. In a topographical survey we determine . . . . . . . .
87. Determine the airplane flying height to obtain the average scale of the photograph equal 1/5000. Ground surface elevations vary from 150 to 300m. Focal length of the camera lens is 150 mm.
88. The bearing of a line AB is 283° 15' and the bearing of another line AC is 5° 45', the included angle is . . . . . . . .
89. When the presmatic compass is transported from one station to another the object vane is folded on the glass cover in order to . . . . . . . .
90. The accuracy of ordinary levelling for subsidance measurement is . . . . . . . .
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