Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Furnishings (hierarchy name)
5. furnishings (works)
6. [furnishings by form or function]
7. lighting devices
8. [lighting devices by form]
9. lamps (lighting devices)
10. [lamps by form]
11. mechanical lamps

Anotations

Scope note:

Mechanical lamps which have a spring-loaded piston in the reservoir which forces oil up through an elaborate control mechanism to the burner. These lamps may be identified by the large flat key below the burner used to compress the spring.