"It is one of the most convenient and versatile instruments for preliminary surveying on the surface or underground."
"It is suitable for forestry, geological and mining purposes, and for simple contour and tracing work."
"Its main part is a magnetic compass with a 5 cm long magnetic needle pivoting on an agate cap."
The given statements are true for:
1. special compasses
2. a mountain compass-transit
3. a convertible transit level
4. a Brunton universal pocket transit