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The direction of the magnetic meridian isestablished at each traverse station and thedirection of the line is determined with referenceto the megnetic meridian. This method oftraversing is called
- a)fast needle method
- b)loose needle method
- c)bearing method
- d)fixed needle method
Correct answer is option 'B'. Can you explain this answer?
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The direction of the magnetic meridian isestablished at each traverse ...
Traversing using Loose Needle Method
Traversing is a technique used in surveying to determine the relative positions of points on the earth's surface. The loose needle method is one of the methods of traversing used in surveying. The following are the details of the method:
Establishing Magnetic Meridian Direction
The first step in traversing using the loose needle method is to establish the direction of the magnetic meridian at each traverse station. This is done using a magnetic compass. The magnetic compass is placed on a tripod and leveled. The compass is then oriented so that the north end of the needle points to the magnetic north. The direction of the line is determined with reference to the magnetic meridian.
Determining the Direction of the Line
Once the direction of the magnetic meridian is established, the direction of the line is determined with reference to the magnetic meridian. This is done by using a theodolite or a total station. The theodolite or total station is placed at the traverse station and leveled. The instrument is then oriented so that the line of sight points in the direction of the desired line. The angle between the line of sight and the magnetic meridian is measured.
Calculating the Bearings
The bearings of the lines are calculated based on the measured angles. The bearing is the angle measured clockwise from the north direction to the line. The bearings are recorded in a traverse table.
Closing the Traverse
The traverse is closed by measuring the distance and direction from the last station to the first station. The errors in the measurements are distributed proportionally to the length of the lines. The traverse is said to be closed if the starting and ending points coincide.
Advantages of Loose Needle Method
- The loose needle method is simple and easy to use.
- It does not require any special equipment.
- It is suitable for short traverses.
Disadvantages of Loose Needle Method
- The accuracy of the method is affected by local magnetic disturbances.
- It is not suitable for long traverses.
- The method is not suitable for precise work.
Traversing is a technique used in surveying to determine the relative positions of points on the earth's surface. The loose needle method is one of the methods of traversing used in surveying. The following are the details of the method:
Establishing Magnetic Meridian Direction
The first step in traversing using the loose needle method is to establish the direction of the magnetic meridian at each traverse station. This is done using a magnetic compass. The magnetic compass is placed on a tripod and leveled. The compass is then oriented so that the north end of the needle points to the magnetic north. The direction of the line is determined with reference to the magnetic meridian.
Determining the Direction of the Line
Once the direction of the magnetic meridian is established, the direction of the line is determined with reference to the magnetic meridian. This is done by using a theodolite or a total station. The theodolite or total station is placed at the traverse station and leveled. The instrument is then oriented so that the line of sight points in the direction of the desired line. The angle between the line of sight and the magnetic meridian is measured.
Calculating the Bearings
The bearings of the lines are calculated based on the measured angles. The bearing is the angle measured clockwise from the north direction to the line. The bearings are recorded in a traverse table.
Closing the Traverse
The traverse is closed by measuring the distance and direction from the last station to the first station. The errors in the measurements are distributed proportionally to the length of the lines. The traverse is said to be closed if the starting and ending points coincide.
Advantages of Loose Needle Method
- The loose needle method is simple and easy to use.
- It does not require any special equipment.
- It is suitable for short traverses.
Disadvantages of Loose Needle Method
- The accuracy of the method is affected by local magnetic disturbances.
- It is not suitable for long traverses.
- The method is not suitable for precise work.
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The direction of the magnetic meridian isestablished at each traverse station and thedirection of the line is determined with referenceto the megnetic meridian. This method oftraversing is calleda)fast needle methodb)loose needle methodc)bearing methodd)fixed needle methodCorrect answer is option 'B'. Can you explain this answer?
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