3 : Sources of Error in Levelling and etc. Flashcards
1
Q
- Instrument out of adjustment
- Rod not of standard length
- Defective tripod
A
Sources of Error in Levelling
2
Q
- Bubble not centered
- Parallax
- Faulty rod readings
- Rod not held plumb
- Incorrect setting of target
- Unequal backsight and foresight distances
A
Personal Errors
3
Q
- Curvature of the earth
- Atmospheric refraction
- Temperature variations
- Wind
- Settlement of the instrument
- Faulty turning points
- Curvature of the earth
- Atmospheric refraction
- Temperature variations
- Wind
- Settlement of the instrument
- Faulty turning points
A
Natural Errors
4
Q
- Misreading the rod
- Incorrect recording
- Erroneous computations
- Rod not fully extended
- Moving turning points
A
Common Mistakes in Levelling
5
Q
A two peg test checks whether your dumpy level is
capable of showing a true horizontal reading. This is
vital to ensure your measurements are accurate and
reliable.
A
Two Peg Test
