1) Project requirements

Two Peg Test

Before you start any project work your first task will be to carry out a two peg test to ensure your level is properly calibrated. Record in your field notes the process and state whether the test results are within the calibration limits..

Collimation error occurs when the collimation axis is not truly horizontal when the instrument is levelled. The effect is illustrated in the sketch below:

Figure 1
Figure 2

The difference between the readings Figure 1 & 2 is not the same (actual 257), therefore the the collimation error is immense and the instrument need to be serviced.

  1. Set out and mark on the ground (with wooden pegs driven into the earth, or roofing nails in tar) two point some 40 m apart. Set up the the level exactly mid-way between them.

  2. Take measurements of backsight and foresight for this first setup. The height difference DH will be free of the effects of collimation error.
  3. Next, move the level to a position just beyond the fore staff position (about 5m). The difference between the readings of the two level positions should be zero. If more than 5 mm the instrument need to be calibrated.

Instrument Level checking   (2 Peg test)

Setup and test the Instrument   ( Inst. No.________ )
                                                               0.0 m                  40.0 to 50 m       Difference

Recording from centre spot :        1 ________           2  ________         ________

Recording from 5 or 45 m spot :   1 ________           2 ________           ________

For each field exercise a level check is required.
This check must be carried out each time before you do levelling.

2) Submission dates

Project 1

refer to Learning Plan

Project 2

refer to Learning Plan

Project 3

refer to Learning Plan

Hand in your submission as soon as possible but not later as directed by your lecturer.

3) Project information


(Two Peg Test)


(Grid levelling)


(Building set out)

Be careful when setting the Profiles. Please make sure you don't damage this equipment.

Please read 'How to set out a Building using profiles'.