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Unlike civil clock bells, the strikes of a ship's bell do not accord to the number of the hour. Instead, there are eight bells, one for each half-hour of a four-hour watch. In the age of sailing, watches were timed with a 30-minute hourglass.
The Kremlin Clock on the Moscow Kremlin rings in 2012.. The most basic sort of striking clock simply sounds a bell once every hour; this is called a passing strike clock. . Passing strike was simple to implement mechanically; all that must be done is to attach a cam to a shaft that rotates once per hour; the cam raises and then lets a hammer fall that strikes t
For example, while six bells have 720 permutations, eight bells have 40,320; furthermore, 10! = 3,628,800, and 12! = 479,001,600. Estimating two seconds for each change (a reasonable pace), one finds that while an extent on six bells can be accomplished in half an hour, an extent on eight bells should take nearly twenty-two and a half hours.
The majority of bell towers have the ring of bells (or ropes) going clockwise from the treble. For convenience, the bells are referred to by number, with the treble being number 1 and the other bells numbered by their pitch (2, 3, 4, etc.) sequentially down the scale.
Unlike civil clock bells, the strikes of a ship's bell do not accord to the number of the hour. Instead, there are eight bells, one for each half-hour of a four-hour watch. Bells would be struck every half-hour, and in a pattern of pairs for easier counting, with any odd bells at the end of the sequence.
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The practice of using bells to mark time dates at least to the time of the early Christian church, which used bells to mark the "canonical hours". [2] An 8th-century Archbishop of York gave his priests instructions to sound church bells at certain times, and by the 10th century Saint Dunstan had written an extensive guide to bell-ringing to mark the canonical hours.
Notre-Dame used to ring the civil hours 24 hours a day, but starting in the 19th century this was reduced to only between 8am to 9pm to avoid disturbing nearby residents. From medieval times, the hours were marked on the main bells, likely only by the number of hours struck at the top of the hour.