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Spire test is to check which of the following permanent adjustments of the theodolite?
- a)Plate level axis is perpendicular to vertical axis
- b)Horizontal axis is perpendicular to vertical axis
- c)The line of sight coincides with the optical axis of the telescope
- d)The axis of the altitude level is parallel to the line of sight
Correct answer is option 'B'. Can you explain this answer?
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Spire test is to check which of the following permanent adjustments of...
Remember the following test:
Spire test: It is a test carried out to remove Error due to non-perpendicularity of the horizontal axis and the vertical axis in surveying Instrument.
Crosshair ring Test: This test is done to make the vertical crosshair lie in a plane perpendicular to the horizontal axis.
Plate level Test: This test is done to make the plate bubbles central to their run when the vertical axis of the theodolite is truly vertical
Vertical arc Test: This test is done to make the vertical circle indicate zero when the line of sight is perpendicular to the vertical axis.
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Spire test is to check which of the following permanent adjustments of...
The Spire test is a method used to check the permanent adjustments of a theodolite. There are several adjustments that need to be checked, and the correct answer is option B, which is the horizontal axis is perpendicular to the vertical axis. Let's break down each of the adjustments that need to be checked:
1. Plate level axis: The plate level axis is the axis around which the theodolite rotates. It is important for this axis to be perpendicular to the vertical axis to ensure accurate measurements.
2. Horizontal axis: The horizontal axis is the axis around which the telescope rotates. It is important for this axis to be perpendicular to the vertical axis to ensure that the telescope remains horizontal and level during measurements.
3. Line of sight: The line of sight is the imaginary line that extends from the telescope to the target being measured. It is important for this line to coincide with the optical axis of the telescope to ensure accurate measurements.
4. Altitude level: The altitude level is used to measure vertical angles. It is important for the axis of the altitude level to be parallel to the line of sight to ensure accurate measurements.
Out of these four adjustments, the Spire test is used to check the horizontal axis. The test involves rotating the theodolite 180 degrees and checking if the horizontal crosshair remains on the same point as before. If it does, the horizontal axis is perpendicular to the vertical axis and the theodolite is correctly adjusted.
1. Plate level axis: The plate level axis is the axis around which the theodolite rotates. It is important for this axis to be perpendicular to the vertical axis to ensure accurate measurements.
2. Horizontal axis: The horizontal axis is the axis around which the telescope rotates. It is important for this axis to be perpendicular to the vertical axis to ensure that the telescope remains horizontal and level during measurements.
3. Line of sight: The line of sight is the imaginary line that extends from the telescope to the target being measured. It is important for this line to coincide with the optical axis of the telescope to ensure accurate measurements.
4. Altitude level: The altitude level is used to measure vertical angles. It is important for the axis of the altitude level to be parallel to the line of sight to ensure accurate measurements.
Out of these four adjustments, the Spire test is used to check the horizontal axis. The test involves rotating the theodolite 180 degrees and checking if the horizontal crosshair remains on the same point as before. If it does, the horizontal axis is perpendicular to the vertical axis and the theodolite is correctly adjusted.
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Spire test is to check which of the following permanent adjustments of the theodolite?a)Plate level axis is perpendicular to vertical axisb)Horizontal axis is perpendicular to vertical axisc)The line of sight coincides with the optical axis of the telescoped)The axis of the altitude level is parallel to the line of sightCorrect answer is option 'B'. Can you explain this answer?
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