Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for engineering and building trades]
8. surveying instruments

Anotations

Scope note:

Instruments consisting of a flat brass bar with sights at the ends and a circular brass box in the middle, containing a magnetic needle, which plays over a graduated circle; the whole being supported on a staff or tripod.