Consider the following purposes of the minor equipments used in survey:
1. Abney level: It is a form of clinometer used for measuring slopes and vertical angles.
2. Sextant: It can be used to measure horizontal and vertical angles.
3. Ceylon Ghat Tracer: It is an instrument used to enlarge or reduce plans
Which of the above are correct?
1
1 and 2
2
2 and 3
3
1 and 3
4
1, 2 and 3