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Which of the following is not a temporary adjustment to a compass used for land surveying?
- a)Focusing the prism
- b)Making the pivot exactly vertically over the ground station mark
- c)Center of the pivot coincides with geometrical center of graduated ring
- d)Levelling
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not a temporary adjustment to a compass used...
Station or temporary adjustments of the prismatic compass
1.centering 2. Levelling 3. Focusing of the prism
Most Upvoted Answer
Which of the following is not a temporary adjustment to a compass used...
Not a temporary adjustment to a compass used for land surveying
Centering the pivot on the graduated ring is not a temporary adjustment to a compass used for land surveying. The other adjustments are necessary to ensure accurate measurements.
Explanation
Compasses used for land surveying must be adjusted before use to ensure accurate measurements. The following are the temporary adjustments that must be made before using a compass for surveying:
1. Focusing the prism: The prism must be focused so that the image of the object being surveyed is clear and sharp.
2. Making the pivot exactly vertically over the ground station mark: The pivot must be positioned exactly over the mark on the ground, which is usually a small nail or pin driven into the ground.
3. Levelling: The compass must be levelled so that the graduated ring is horizontal.
4. Centering the pivot coincides with the geometrical center of the graduated ring: The pivot must be centered on the graduated ring to ensure accurate measurements.
Conclusion
In conclusion, land surveyors use compasses to measure angles and bearings. Before using a compass, temporary adjustments must be made to ensure accurate measurements. Focusing the prism, making the pivot exactly vertically over the ground station mark, and levelling the compass are temporary adjustments that must be made. Centering the pivot on the graduated ring is not a temporary adjustment.
Centering the pivot on the graduated ring is not a temporary adjustment to a compass used for land surveying. The other adjustments are necessary to ensure accurate measurements.
Explanation
Compasses used for land surveying must be adjusted before use to ensure accurate measurements. The following are the temporary adjustments that must be made before using a compass for surveying:
1. Focusing the prism: The prism must be focused so that the image of the object being surveyed is clear and sharp.
2. Making the pivot exactly vertically over the ground station mark: The pivot must be positioned exactly over the mark on the ground, which is usually a small nail or pin driven into the ground.
3. Levelling: The compass must be levelled so that the graduated ring is horizontal.
4. Centering the pivot coincides with the geometrical center of the graduated ring: The pivot must be centered on the graduated ring to ensure accurate measurements.
Conclusion
In conclusion, land surveyors use compasses to measure angles and bearings. Before using a compass, temporary adjustments must be made to ensure accurate measurements. Focusing the prism, making the pivot exactly vertically over the ground station mark, and levelling the compass are temporary adjustments that must be made. Centering the pivot on the graduated ring is not a temporary adjustment.
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Which of the following is not a temporary adjustment to a compass used for land surveying?a)Focusing the prismb)Making the pivot exactly vertically over the ground station markc)Center of the pivot coincides with geometrical center of graduated ringd)LevellingCorrect answer is option 'C'. Can you explain this answer?
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