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. watches

Narrower term/s

• digital watches

Anotations

Scope note:

Timepieces, usually worn on the wrist, that are powered with a "resonance drive," in which a tiny tuning fork driven electrically provides the motive power. First produced in 1953, the resonance drive type, properly called an electronic watch maintains accuracy since it operates at a frequency higher than that customarily used with balance-type watches. When the battery is too weak to operate the tuning fork, the watch simply stops, without deterioration. Power is provided by miniature high-energy-density batteries.