61. The self aligning level called . . . . . . . .
62. The magnetic bearing of a line AB is 132°. What is the true bearing of the line of magnetic declination is 8° 30' E.
63. The most reliable method of plotting a theodolite traverse is by . . . . . . . .
64. The number of plates in theodolite.
65. The length of the line measured with a 30m chain was found to be 450m. Calculate the true length of the line if the chain was 0.15 in too long.
66. Reduced bearings are measured from . . . . . . . .
67. From the following page of a levelling field book, the missing values in F. S. and B. S respectively are
Station
B. S.
I. S.
F. S.
Rise
Fall
Remarks
1
4.550
Starting Point
2
2.125
?
0.750
Change point
3
2.225
4
?
1.975
Change point
5
2.445
1.500
| Station | B. S. | I. S. | F. S. | Rise | Fall | Remarks |
|---|---|---|---|---|---|---|
| 1 | 4.550 | Starting Point | ||||
| 2 | 2.125 | ? | 0.750 | Change point | ||
| 3 | 2.225 | |||||
| 4 | ? | 1.975 | Change point | |||
| 5 | 2.445 | 1.500 |
68. Common scale used for plotting building site is . . . . . . . .
69. The dip of the magnetic needle at the pole is . . . . . . . .
70. The invar tape ismade of an alloy of . . . . . . . .
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