Consider the following statements related to set out the curve using two theodolite method :
To set out the curve,
1. set up a theodolite over T1 and another over T2.
2. set the vernier of each of the instruments to zero.
3. direct the instrument at T1 to the ranging rod at the point of intersection B and bisect it.
Which of the above statements are correct ?
1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3