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The temporary adjustments of a prismatic compass are
(i) Centering
(ii) Levelling
(iii) Focusing the prism
The correct order is
- a)(i), (iii), (ii)
- b)(i), (ii), (iii)
- c)(ii), (iii), (i)
- d)(iii), (i), (ii)
Correct answer is option 'B'. Can you explain this answer?
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The temporary adjustments of a prismatic compass are(i) Centering(ii) ...
Understanding Temporary Adjustments of a Prismatic Compass
Temporary adjustments are essential for ensuring the accuracy of measurements taken with a prismatic compass. The correct order of adjustments is vital for effective usage.
1. Centering
- Centering involves aligning the compass over the survey point.
- This step ensures that the magnetic needle is free to move and can give an accurate reading.
- Proper centering eliminates parallax errors in the compass reading.
2. Levelling
- Levelling is the process of making sure the compass is horizontal.
- It involves adjusting the leveling screws until the bubble in the spirit level is centered.
- A level compass is crucial for accurate angle measurements and overall reliability of the instrument.
3. Focusing the Prism
- After centering and leveling, the next step is to focus the prism.
- This adjustment allows the observer to see the scale and the needle clearly.
- Proper focusing ensures that the readings taken are sharp and easily readable, minimizing visual errors.
Conclusion
The correct sequence of temporary adjustments for a prismatic compass is (i) Centering, (ii) Levelling, and (iii) Focusing the prism. This order ensures that each step builds upon the previous one, leading to accurate and reliable measurements. Thus, the answer is option 'B'.
Temporary adjustments are essential for ensuring the accuracy of measurements taken with a prismatic compass. The correct order of adjustments is vital for effective usage.
1. Centering
- Centering involves aligning the compass over the survey point.
- This step ensures that the magnetic needle is free to move and can give an accurate reading.
- Proper centering eliminates parallax errors in the compass reading.
2. Levelling
- Levelling is the process of making sure the compass is horizontal.
- It involves adjusting the leveling screws until the bubble in the spirit level is centered.
- A level compass is crucial for accurate angle measurements and overall reliability of the instrument.
3. Focusing the Prism
- After centering and leveling, the next step is to focus the prism.
- This adjustment allows the observer to see the scale and the needle clearly.
- Proper focusing ensures that the readings taken are sharp and easily readable, minimizing visual errors.
Conclusion
The correct sequence of temporary adjustments for a prismatic compass is (i) Centering, (ii) Levelling, and (iii) Focusing the prism. This order ensures that each step builds upon the previous one, leading to accurate and reliable measurements. Thus, the answer is option 'B'.
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The temporary adjustments of a prismatic compass are(i) Centering(ii) Levelling(iii) Focusing the prismThe correct order isa)(i), (iii), (ii)b)(i), (ii), (iii)c)(ii), (iii), (i)d)(iii), (i), (ii)Correct answer is option 'B'. Can you explain this answer?
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