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Which one of the following instruments is used in plane table surveying for the measurement of horizontal and vertical distances directly?
- a)Telescopic alidade
- b)Plain alidade
- c)Tacheometer
- d)Clinometer
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Which one of the following instruments is used in plane table surveyin...
Telescopic alidade
Explanation:
Plane table surveying is a graphical method of surveying in which the fieldwork and plotting are done simultaneously. It is used to map the details of the topography of the land. The main instrument used in plane table surveying is the alidade. There are different types of alidades, such as plain alidade and telescopic alidade.
1. Telescopic alidade: This is an alidade with a small telescope mounted on it. The telescope helps in sighting more accurately and can measure horizontal and vertical distances directly. It has a stadia diaphragm with horizontal stadia hairs, which allows for the direct measurement of distances by multiplying the staff intercept by the stadia multiplying constant. Thus, telescopic alidade is the correct answer.
Explanation:
Plane table surveying is a graphical method of surveying in which the fieldwork and plotting are done simultaneously. It is used to map the details of the topography of the land. The main instrument used in plane table surveying is the alidade. There are different types of alidades, such as plain alidade and telescopic alidade.
1. Telescopic alidade: This is an alidade with a small telescope mounted on it. The telescope helps in sighting more accurately and can measure horizontal and vertical distances directly. It has a stadia diaphragm with horizontal stadia hairs, which allows for the direct measurement of distances by multiplying the staff intercept by the stadia multiplying constant. Thus, telescopic alidade is the correct answer.
2. Plain alidade: This is a simple, straight-edged ruler with a vertical sight vane at each end. It is used for sighting and drawing lines on the plane table sheet. However, it does not provide direct measurement of distances.
3. Tacheometer: This is a type of theodolite with a stadia diaphragm, specially designed for rapid measurements of horizontal and vertical distances. It is not used in plane table surveying.
4. Clinometer: This is an instrument used to measure the angles of slope or elevation of an object with respect to gravity. It is not used in plane table surveying for the direct measurement of horizontal and vertical distances.
3. Tacheometer: This is a type of theodolite with a stadia diaphragm, specially designed for rapid measurements of horizontal and vertical distances. It is not used in plane table surveying.
4. Clinometer: This is an instrument used to measure the angles of slope or elevation of an object with respect to gravity. It is not used in plane table surveying for the direct measurement of horizontal and vertical distances.
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Which one of the following instruments is used in plane table surveyin...
Telescopic Alidade in Plane Table Surveying
In plane table surveying, the telescopic alidade is used for the measurement of both horizontal and vertical distances directly. It is one of the essential instruments used in this type of surveying technique.
What is Plane Table Surveying?
Plane table surveying is a method of surveying in which a plane table, equipped with a drawing sheet, is set up at a point on the ground. The table is then oriented using a compass or by sighting known points. The surveyor can then visually measure the location of other points relative to the table.
Telescopic Alidade
The telescopic alidade is an instrument that consists of a telescope mounted on a tripod or on the plane table itself. It is used for sighting and measuring angles and distances in plane table surveying.
Measurement of Horizontal Distances
The telescopic alidade is equipped with a horizontal circle that allows the surveyor to measure horizontal angles. By aligning the telescope with two points on the ground and reading the angles from the scale, the surveyor can determine the horizontal distance between those points. This is known as the method of resection.
Measurement of Vertical Distances
To measure vertical distances directly, the telescopic alidade is equipped with a vertical staff or stadia rod. The surveyor can align the telescope with the staff and read the height directly from the scale on the staff. This is known as the stadia method.
Advantages of Telescopic Alidade
The use of a telescopic alidade in plane table surveying offers several advantages:
1. Direct measurements: The telescopic alidade allows for direct measurements of both horizontal and vertical distances, eliminating the need for complex calculations.
2. Accuracy: The use of a telescope and precise scales ensures accurate measurements of angles and distances.
3. Efficiency: The telescopic alidade allows the surveyor to quickly and efficiently measure distances in the field.
4. Versatility: The telescopic alidade can be used in various surveying applications, making it a versatile instrument.
In conclusion, the telescopic alidade is an essential instrument in plane table surveying as it allows for the direct measurement of both horizontal and vertical distances. Its use offers advantages such as accuracy, efficiency, and versatility in surveying operations.
In plane table surveying, the telescopic alidade is used for the measurement of both horizontal and vertical distances directly. It is one of the essential instruments used in this type of surveying technique.
What is Plane Table Surveying?
Plane table surveying is a method of surveying in which a plane table, equipped with a drawing sheet, is set up at a point on the ground. The table is then oriented using a compass or by sighting known points. The surveyor can then visually measure the location of other points relative to the table.
Telescopic Alidade
The telescopic alidade is an instrument that consists of a telescope mounted on a tripod or on the plane table itself. It is used for sighting and measuring angles and distances in plane table surveying.
Measurement of Horizontal Distances
The telescopic alidade is equipped with a horizontal circle that allows the surveyor to measure horizontal angles. By aligning the telescope with two points on the ground and reading the angles from the scale, the surveyor can determine the horizontal distance between those points. This is known as the method of resection.
Measurement of Vertical Distances
To measure vertical distances directly, the telescopic alidade is equipped with a vertical staff or stadia rod. The surveyor can align the telescope with the staff and read the height directly from the scale on the staff. This is known as the stadia method.
Advantages of Telescopic Alidade
The use of a telescopic alidade in plane table surveying offers several advantages:
1. Direct measurements: The telescopic alidade allows for direct measurements of both horizontal and vertical distances, eliminating the need for complex calculations.
2. Accuracy: The use of a telescope and precise scales ensures accurate measurements of angles and distances.
3. Efficiency: The telescopic alidade allows the surveyor to quickly and efficiently measure distances in the field.
4. Versatility: The telescopic alidade can be used in various surveying applications, making it a versatile instrument.
In conclusion, the telescopic alidade is an essential instrument in plane table surveying as it allows for the direct measurement of both horizontal and vertical distances. Its use offers advantages such as accuracy, efficiency, and versatility in surveying operations.
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Which one of the following instruments is used in plane table surveying for the measurement of horizontal and vertical distances directly?a)Telescopic alidadeb)Plain alidadec)Tacheometerd)ClinometerCorrect answer is option 'A'. Can you explain this answer?
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