31. When the whole circle bearing is between 180° and 270°, reduced bearing equal to . . . . . . . .
32. ∠DAB = 140° 10' bearing of AB = 60°. Then bearing of AD is equal to . . . . . . . .
33. In prismatic compass, which enables very high or very low objects to be read
34. Ball and socket joint in the presmatic compass stand is for . . . . . . . .
35. In prismatic compass, this enables focussing of readings to be done . . . . . . . .
36. Speedometer may sometimes be utilised for . . . . . . . .
37. The variation in declination which follows sine curve pattern (roller-costar] is
38. Abney level used to measure . . . . . . . .
39. The accuracy of precise levelling for subsidence measurement is . . . . . . . .
40. Points at ends of chain lines which provide good command of the area to be surveyed called . . . . . . . .
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