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A '''Ship's bells''' are used to indicate time onboard ship. One bell sounds for each half hour. One Bells are rung in pairs to make it easier to count.<ref>http://www.boatsafe.com/nauticalknowhow/shipbee.htm</ref> Thus, for a watch starting at 12:00, one bell means 12:30, two bells mean 1:00, three two bells mean pause 1 bell means 1:30, and so on until 4:00 ("eight bells"). At 4:30 the This cycle begins starts again with one for the next watch. The use of 30 minutes as the interval between bells originates from the use of a half hour glass to keep time. Each half hour, the glass would be flipped and the appropriate count of the bellwould be rung.<ref>U.S. Department of Transportation Maritime Administration [http://www.maradhistory.dotnavy.govmil/publicationsfaqs/glossary/glossaryfaq83-1.html]htm</ref>  {|border=1|-!Number of bells!colspan=3|Hour|-!One bell|12:30|4:30|8:30|-!Two bells|1:00|5:00|9:00|-!Three bells|1:30|5:30|9:30|-!Four bells|2:00|6:00|10:00|-!Five bells|2:30|6:30|10:30|-!Six bells|3:00|7:00|11:00|-!Seven bells|3:30|7:30|11:30|-!Eight bells|4:00|8:00|12:00|}