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In the prismatic compass
- a)the magnetic needle.moves with the box
- b)the fine of the sight does not move with the box
- c)the magnetic needle and graduated circle do not move with the box
- d)the graduated circle needle always remains in the N-S direction
Correct answer is option 'C'. Can you explain this answer?
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In the prismatic compassa)the magnetic needle.moves with the boxb)the ...
Prismatic Compass and its Components
A prismatic compass is a type of compass used for measuring azimuths or bearings of lines of sight in surveying. It consists of the following components:
1. Magnetic needle: It is a magnetized needle that aligns itself with the magnetic field of the earth and indicates the magnetic north-south direction.
2. Graduated circle: It is a circular scale that is divided into 360 degrees and is used to measure angles in surveying.
3. Sight vanes: They are two small metal plates that are attached to the compass box and used for sighting.
4. Prism: It is a triangular glass prism that reflects the image of the graduated circle and allows the observer to read the angle directly.
Functioning of Prismatic Compass
When a prismatic compass is used, the compass box is placed on the ground and leveled using the leveling screws. The magnetic needle and graduated circle are then fixed in position and do not move with the box. The sight vanes are used to sight the object, and the prism reflects the image of the graduated circle to the observer's eye.
The observer can then read the angle directly from the graduated circle without having to move the compass box. This allows for more accurate measurements and reduces errors caused by moving the compass box.
Correct Answer
Option C is the correct answer, as the magnetic needle and graduated circle do not move with the box in a prismatic compass.
A prismatic compass is a type of compass used for measuring azimuths or bearings of lines of sight in surveying. It consists of the following components:
1. Magnetic needle: It is a magnetized needle that aligns itself with the magnetic field of the earth and indicates the magnetic north-south direction.
2. Graduated circle: It is a circular scale that is divided into 360 degrees and is used to measure angles in surveying.
3. Sight vanes: They are two small metal plates that are attached to the compass box and used for sighting.
4. Prism: It is a triangular glass prism that reflects the image of the graduated circle and allows the observer to read the angle directly.
Functioning of Prismatic Compass
When a prismatic compass is used, the compass box is placed on the ground and leveled using the leveling screws. The magnetic needle and graduated circle are then fixed in position and do not move with the box. The sight vanes are used to sight the object, and the prism reflects the image of the graduated circle to the observer's eye.
The observer can then read the angle directly from the graduated circle without having to move the compass box. This allows for more accurate measurements and reduces errors caused by moving the compass box.
Correct Answer
Option C is the correct answer, as the magnetic needle and graduated circle do not move with the box in a prismatic compass.
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In the prismatic compassa)the magnetic needle.moves with the boxb)the fine of the sight does not move with the boxc)the magnetic needle and graduated circle do not move with the boxd)the graduated circle needle always remains in the N-S directionCorrect answer is option 'C'. Can you explain this answer?
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