time balls

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  3. Objects Facet
  4. Furnishings and Equipment (hierarchy name)
  5. Measuring Devices (hierarchy name)
  6. measuring devices (instruments)
  7. [measuring devices for extent]
  8. timepieces
  9. [timepieces by form]
  10. clocks
  11. [clocks by form]
  12. time balls
Scope note
Balls that are mounted on vertical poles or rods, often surmounting towers, and that move downward at predermined times to provide precise signals from a distance.
time balls
Accepted term: 13-Jan-2025