Introduction
Two Peg Check is a surveying operation carried out to find out whether or not the leveling bubble and telescope line of sight are parallel.
Goal
Peg Check is a surveying operation carried out to find out if the leveling bubble (bubble axis) and telescope line-of-sight (line of collimation) are parallel.
Instruments
Dumpy degree
Tripod Employees
Tape Bubble employees
Discipline Work Process
Every group is required to carry out a peg take a look at to examine the instrument.
Every individual within the group is report the outcomes of the Peg Check in their very own area e book.
Set out and mark on the bottom (with wood pegs pushed into the bottom) two level some 15 m aside.
Instrument is ready up halfway between two level A and B.
Employees is learn on every employees level A and level B and the peak distinction is calculated. Made positive the bubble employees is heart
Subsequent, instrument is moved about 5m behind the purpose B. nd employees at level A and level B is learn. vii. Report the info.
End result
Level A1 – level B1 =1. 312 – 1. 310 =zero. 002m Level A2 – level B2 =1. 239 – 1. 238 =zero. 001m STN 1 – STN 2 = zero. 002 – zero. 001 =zero. 001m =1mm ? < ± 2mm
Evaluation
The error is ±2mm so it may be accepted. The instrument is in good situation and may utilized in area work.
Conclusion
The instrument could be decided the leveling bubble (bubble axis) and telescope line-of-sight (line of collimation) are parallel.
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