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Which of the following instrument is used for centering the theodolite in windy conditions?
- a)Cross staff
- b)Optical plummet
- c)Optical square
- d)Spirit level
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which of the following instrument is used for centering the theodolite...
Optical plummet: A device on some transits and theodolites used to centre the instrument over a point, in place of a plumb bob, which moves in a strong wind.
Optical Square: a small hand instrument used by surveyors for laying off a right angle by means of two mirrors set at an angle of 45 degrees.
Cross staff: The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes moving over it.
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Which of the following instrument is used for centering the theodolite...
Using Optical Plummet for Centering Theodolite in Windy Conditions
Introduction:
In the field of surveying, theodolite is an instrument used for measuring angles in both horizontal and vertical planes. However, in windy conditions, it becomes difficult to center the theodolite accurately. To overcome this issue, an optical plummet is used.
Optical Plummet:
An optical plummet is a device used for precise centering of the theodolite in the field. It consists of a telescope that is mounted on a vertical axis. The telescope is aligned with a crosshair that is located at the bottom of the device. The plummet is equipped with a lens that projects a vertical image onto the crosshair.
Working Principle:
The optical plummet works on the principle of gravity. When the plummet is placed on a flat and level surface, the crosshair aligns with the vertical image projected by the lens. The theodolite is then placed on the same surface in line with the crosshair. The optical plummet provides a precise vertical reference point for the theodolite.
Advantages:
Using an optical plummet offers several advantages when centering the theodolite in windy conditions. Some of these are:
- Provides a precise vertical reference point for the theodolite
- Eliminates the effects of wind on the centering of the theodolite
- Saves time and increases the accuracy of measurements
Conclusion:
In conclusion, an optical plummet is an essential device for accurate centering of the theodolite in the field. It eliminates the effects of wind and provides a precise vertical reference point for the theodolite.
Introduction:
In the field of surveying, theodolite is an instrument used for measuring angles in both horizontal and vertical planes. However, in windy conditions, it becomes difficult to center the theodolite accurately. To overcome this issue, an optical plummet is used.
Optical Plummet:
An optical plummet is a device used for precise centering of the theodolite in the field. It consists of a telescope that is mounted on a vertical axis. The telescope is aligned with a crosshair that is located at the bottom of the device. The plummet is equipped with a lens that projects a vertical image onto the crosshair.
Working Principle:
The optical plummet works on the principle of gravity. When the plummet is placed on a flat and level surface, the crosshair aligns with the vertical image projected by the lens. The theodolite is then placed on the same surface in line with the crosshair. The optical plummet provides a precise vertical reference point for the theodolite.
Advantages:
Using an optical plummet offers several advantages when centering the theodolite in windy conditions. Some of these are:
- Provides a precise vertical reference point for the theodolite
- Eliminates the effects of wind on the centering of the theodolite
- Saves time and increases the accuracy of measurements
Conclusion:
In conclusion, an optical plummet is an essential device for accurate centering of the theodolite in the field. It eliminates the effects of wind and provides a precise vertical reference point for the theodolite.
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Which of the following instrument is used for centering the theodolite in windy conditions?a)Cross staffb)Optical plummetc)Optical squared)Spirit levelCorrect answer is option 'B'. Can you explain this answer?
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Which of the following instrument is used for centering the theodolite in windy conditions?a)Cross staffb)Optical plummetc)Optical squared)Spirit levelCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which of the following instrument is used for centering the theodolite in windy conditions?a)Cross staffb)Optical plummetc)Optical squared)Spirit levelCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following instrument is used for centering the theodolite in windy conditions?a)Cross staffb)Optical plummetc)Optical squared)Spirit levelCorrect answer is option 'B'. Can you explain this answer?.
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