A Congreve clock (also known as Congreve's Rolling Ball Clock or Oscillating Path Rolling Ball Clock) is a type of clock that uses a ball rolling along a zigzag track rather than a pendulum to regulate the time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zigzag track, where it trips the escapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward. Thus the angle of the plate reverses and the clock hands move forward between one and four times every minute. On versions of the clock with a dial to indicate seconds, the second hand jumps forward either 15 or 30 seconds on each oscillation depending on the length of the track.
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| - Kugellaufuhr (de)
- Congreve clock (en)
- Kulklocka (sv)
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| - Die Kugellaufuhr gehört zu den und wurde im 16. Jahrhundert von Margraf und Grollier de Serriere erfunden. (de)
- A Congreve clock (also known as Congreve's Rolling Ball Clock or Oscillating Path Rolling Ball Clock) is a type of clock that uses a ball rolling along a zigzag track rather than a pendulum to regulate the time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zigzag track, where it trips the escapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward. Thus the angle of the plate reverses and the clock hands move forward between one and four times every minute. On versions of the clock with a dial to indicate seconds, the second hand jumps forward either 15 or 30 seconds on each oscillation depending on the length of the track. (en)
- En kulklocka är ett ur som drivs av en fjäder eller ett lod och regleras av en kula som rullar i zigzag över en platta av mässing och utlöser en vippimpuls som vrider fram minutvisaren. Den tillskrivs uppfinnaren William Congreve som patentsökte den år 1808. Congreve var inte den första som konstruerade en kulklocka. National Museum of Scotland har ett fungerande exemplar från 1804 och både och konstruerade liknande klockor på 1600-talet. (sv)
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| - A Congreve clock (also known as Congreve's Rolling Ball Clock or Oscillating Path Rolling Ball Clock) is a type of clock that uses a ball rolling along a zigzag track rather than a pendulum to regulate the time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zigzag track, where it trips the escapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward. Thus the angle of the plate reverses and the clock hands move forward between one and four times every minute. On versions of the clock with a dial to indicate seconds, the second hand jumps forward either 15 or 30 seconds on each oscillation depending on the length of the track. Congreve appears to have been unaware that rolling ball clocks had been invented earlier by both Nicolas Grollier de Servière and . Congreve's version differed from Grollier's rolling ball clock in that the ball travelled down a zigzag rather than straight path. While Sayller's version had also used a zigzag path, it had utilized a number of balls and a fixed table rather than the single ball and tilting table employed by Congreve. The "Extreme Detached Escapement" (as Congreve referred to his escapement design) was patented in 1808. Congreve, who was not a clock maker, hired Gravell & Tolkien to produce the first working version, which he then presented to the Prince of Wales in 1808. This version was weight-driven, but the second design, which appears to have been constructed by John Moxon, was spring-driven. The second model is in the collection of Buckingham Palace. Congreve clocks are unreliable timekeepers — the time taken for the ball to travel along the track varies greatly depending on the cleanliness of the track and ball, and since the plate is aligned horizontally, it is easy for dust to accumulate. (en)
- Die Kugellaufuhr gehört zu den und wurde im 16. Jahrhundert von Margraf und Grollier de Serriere erfunden. (de)
- En kulklocka är ett ur som drivs av en fjäder eller ett lod och regleras av en kula som rullar i zigzag över en platta av mässing och utlöser en vippimpuls som vrider fram minutvisaren. Den tillskrivs uppfinnaren William Congreve som patentsökte den år 1808. Congreve var inte den första som konstruerade en kulklocka. National Museum of Scotland har ett fungerande exemplar från 1804 och både och konstruerade liknande klockor på 1600-talet. Kulklockor är inte lika exakta som samtida pendelur eftersom kulans hastighet påverkas av smuts och damm i spåret på metallplattan. En avvikelse på upp till 15 minuter per dygn är inte ovanlig. (sv)
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