a). Explain how the presence of the collimation error, "e" can be detected in a "Two Peg Test" operation.
b). A, B and C are three points on line, such that AB = 90 metres and BC = 70 metres. A leveling instrument is set up at I1 and I2 on line AB, such that AI1 = 30 metres, and I2B = 30 metres.
The data below was then collected.
I.S S.S S.R(m) Remark
I1 A 2.040 upright
I1 B 1.881 upright
I2 A 3.222 upright
I2 B 3.183 upright
I2 C 3.003 inverted
1). Determine the collimation error, e, present in the instrument.
2). Calculate the uniform slope of line AC in the form 1 in N.