51. In optical reading instruments.
52. The main function of levelling is either to determine the elevations and to determine . . . . . . . . in elevation of the given points.
53. The line joining the point of commencement to point of tangency called . . . . . . . .
54. Error due to imperfect focussing of eye piece and object lens cdmes under.
55. Length of the chord calculated by the formule.
56. The whole circle bearings of two lines are 80°and 300°.The interior angle included between two lines is . . . . . . . .
57. The horizontal angle which the magnetic meridian makes with the true meridian is known . . . . . . . .
58. Chain triangulation involves measurement of . . . . . . . .
59. The curve which is having a single arc of a circle connecting two straights called
60. For a curve of radious 100m and normal chord 10m, the Rankine's deflection angle is
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