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. timepieces
8. [timepieces by form]
9. clocks
10. [clocks by function]

Anotations

Scope note:

Clocks of great accuracy containing a deadbeat escapement and temperature-compensated pendulum used for the regulation of other timepieces; usually tall case clocks in form. These were initially used in observatories and clock and watch shops as the standard of accuracy during repairs, synchronization, and manufacturing.