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Encyclopedia > Caisson lock
Operation of caisson lock
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Operation of caisson lock

A caisson lock is a type of canal lock in which a Narrowboat is enclosed in a sealed box and raised or lowered between two water levels. Canal locks in England. ... Moored narrowboats near Tardebigge, Worcestershire, England A narrowboat is a boat or small barge used on narrow beam canals in Britain. ...

Contents


History

It was patented in 1792 as the ‘Hydrostatick Caisson Lock’. The box would probably have displaced about 270 tonnes and weighed about 170 tonnes together with the water in it, so about 100 tonnes of ballast would have been needed to give neutral buoyancy. The box could have been strong enough to withstand the pressure of 50 feet of water i.e. about 3,000 lb/sq.ft. (150 kPa) at the bottom of the chamber.[1]


The use of caisson locks was proposed by Robert Weldon (b:?1754 to d:1810) for use on the Somerset Coal Canal at Combe Hay around 1800 to overcome water supply problems. Each lock was 80 ft long and 60 ft deep and contained a closed wooden box which could take a barge. This box moved up and down in the 60ft (18.2m) deep pool of water, which never left the lock. The box was demonstrated to the Prince Regent (later George IV), but had various engineering problems, possibly including the fuller's earth rock stratum in this area[2] and was never successful commercially or built elsewhere.[3] [4] The Somerset Coal Canal (otherwise the Somersetshire Coal Canal) was a narrow canal from Paulton to Limpley Stoke where it joined the Kennet and Avon Canal so giving ready access from the coal fields of Somerset, which at their peak contained 80 collieries, to London. ... Combe Hay is a village in the English county of Somerset. ... Self propelled barge carrying bulk crushed stone A barge is a flat-bottomed boat, built mainly for river and canal transport of heavy goods. ... Prince Regent (or Prince Regnant, as a direct borrowing from French language) is a prince who rules a country instead of a sovereign, e. ... George IV (George Augustus Frederick) (12 August 1762 – 26 June 1830) was king of the United Kingdom of Great Britain and Ireland and Hanover from 29 January 1820 until his death. ... Fullers earth is any nonplastic clay or claylike material that can be used to decolorize, filter, and purify animal, mineral, and vegetable oils and greases. ...


Dimensions

  • height: 20 meters (66 feet)
  • width: from 3 to 6 meters (from 11 to 20 feet)
  • length: 27 meters (88 feet)
  • toothed rack: 14 meters (46 feet)
  • rotation: approximately 7 minutes

Tests

  • No 1: February 1798: cracks
  • No 2: June 1798: success
  • No 3: April 1799: success
  • No 4: April 1799: success, in the presence of the Prince Regent
  • No 5: April 1799: success, transport of 60 passengers
  • No 6: May 1799: box blocked by a projecting stone

Prince Regent (or Prince Regnant, as a direct borrowing from French language) is a prince who rules a country instead of a sovereign, e. ...

See also

  • Robert Weldon's Somersetshire Coal Canal caisson lock (article in French).

References

  1. ^ The Combe Hay Caisson Lock. Bath Royal Literary and Scientific Institution. Retrieved on 2006-10-08.
  2. ^ History of the Somersetshire Coal Canal. The Somersetshire Coal Canal (Society). Retrieved on 2006-10-08.
  3. ^ The Somerset Coal Canal. Bath Royal Literary and Scientific Institution. Retrieved on 2006-10-06.
  4. ^ History of the Caisson Lock On the Somersetshire Coal Canal. The Somersetshire Coal Canal (Society). Retrieved on 2006-10-06.

2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 8 is the 281st day of the year in the Gregorian Calendar (282nd in leap years). ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 8 is the 281st day of the year in the Gregorian Calendar (282nd in leap years). ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 6 is the 279th day of the year (280th in leap years). ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 6 is the 279th day of the year (280th in leap years). ...

External links

  • Somersetshire Coal Canal Society

 
 

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