bn:00077272n
Noun Concept
Categories: Navigational equipment, Time balls, Horology
EN
time-ball  time ball  Timeball Station  time balls  timeball tower
EN
A ball that slides down a staff to show a fixed time; especially at an observatory WordNet 3.0
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EN
A ball that slides down a staff to show a fixed time; especially at an observatory WordNet 3.0 & Open English WordNet
A time ball or timeball is a time-signalling device. Wikipedia
Time-signalling device Wikidata
A large wooden or metal ball that drops at a predetermined time to enable sailors to check their marine chronometers from their boats offshore. Wiktionary
WordNet 3.0 & Open English WordNet
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