51. The upper plate of theodolite provided with two verniers placed . . . . . . . . a part and marked A and B.
52. To measure the length precisly with an invar tape the limits of error is . . . . . . . .
53. The error due to variation in temperature is . . . . . . . .
54. When the instrument is correctly levelled then height of plane of collimation is synorymous with . . . . . . . .
55. For true difference in elevations between two points A and B, the level must be set up.
56. The magnetic bearing of a line AB is 141° 15'. What is the true bearing of the line if the magnetic declination is 8° 15'W.
57. The transit theodolite fitted with stadia diaphragm and an annalatic lens called
58. The minimum number of satellites required to locate the position of any object on the air
59. In a closed traverse ABCDA, the sum of included angles . . . . . . . .
60. Minimum mapping unit also called . . . . . . . .
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