Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for extent]
7. distance measuring devices
8. linear distance measuring devices
9. rulers (measuring devices)
10. [rulers by form]

Anotations

Scope note:

Rulers composed of light strips of wood joined so that the individual pieces fold and usually pivot in more than one plane; most commonly in 2-foot lengths with four folds. Historically superseded by zigzag rules, which are generally longer and have strips that all fold, zigzag fashion, in a single plane and by metal tape rules.