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By balancing back sight and fore sight error due to non parallelism of the line of collimation can be eliminated.

By balancing back sight and fore sight error due to non parallelism of the line of collimation can be eliminated. Correct Answer True

When the difference in elevation between any two points is determined from a single set up back sighting on one point and fore sighting on the other, error due to non parallelism of the line of collimation can be eliminated. Error due to refraction also is eliminated.

Related Questions

The following readings were obtained during differential levelling. Reduced Level (RL) of point A is 240,000 m. The fore sight and back sight between points A and TPI is 1.420 m and 2.024 m, respectively. Fore sight and back sight between points TPI and TP2 is 2.100 m and 1.986 m, respectively. The back sight from B is 1.722 m. These are marked on the given figure. What is the RL at turning point - 2 (TP2)? All values are in metres.
If the observed back sight and fore sight are x1 and x2. The correction back sight on A will be equal to x1-y1, where y1= D1 tan i°. The correct fore sight on B will be equal to x2-y2 where, y2 = D2 tan i°. Then what is the correction difference in level between A and B.
If the observed back sight and fore sight are x1 and x2. The correction back sight on A will be equal to x1-y1, where y1= D1 tan i°. The correct fore sight on B will be equal to x2-y2 where, y2 = D2 tan i°. Then what is the correction difference in level between A and B, if D1 = D2?
If the observed back sight and fore sight are 20 m and 18 m. The correction back sight on A will be equal to 16 m, The correct fore sight on B will be equal to 14 m where then what is the correction difference in level between A and B?
By balancing back sight and fore sight error due to curvature can be eliminated.
Which of the following errors can be eliminated by a method of repetition? i) errors due to eccentricity. ii) errors due to in adjustments of line of collimation. iii) error due to inaccurate graduations. iv) error due to inaccurate bisection of the object.
A levelling work was carried out along a falling gradient using a dumpy level and a levelling staff of 3 m length. The following successive readings were taken: 1.155, 2.74, 0.75, 1.79 m. What is the correct order of booking the four readings in the field book? (BS: back sight, FS : fore sight, IS : intermediate sight)
Which of the following option is correct for given statements about parallelism? Statement 1: A dial indicator is used to test parallelism of two planes. Statement 2: Parallelism defines the distance between two surfaces that are parallel to each other and the datum surface.
If the back sight and fore sight distances are balanced, the elevation between two points is equal to the difference between the rod readings taken to the two points and correction for curvature and refraction is necessary.
By taking back sight and fore sight reading to eliminate the . . . . . . . .