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A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. [4] Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. [5]
A short pound on the Chesterfield Canal in England, United Kingdom. A canal pound (from impound), [1] reach, or level (American usage), is the stretch of level water impounded between two canal locks. Canal pounds can vary in length from the non-existent, where two or more immediately adjacent locks form a lock staircase, to many kilometres/miles.
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English: Sequence of operation of a canal pound lock: 1. Boat sailing upstream 2. Boat enters lock 3. Downstream gates close 4 and 5. Chamber filled 6. Upstream gates open 7. Boat leaves lock 8. Boat sailing downstream 9. Boat enters lock 10. Upstream gates close 11 and 12. Chamber emptied 13. Downstream gates open 14. Boat leaves lock
Abingdon Lock is a lock on the River Thames in England, less than 1 mile east and upstream of Abingdon, Oxfordshire, on the opposite bank of the river. It was originally built in 1790 by the Thames Navigation Commission. The weir runs across from the Abingdon side to the lock island, and has a pedestrian walkway across it.
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English-speaking countries also used a system of units of fluid measure, or in modern terminology volume units, based on the apothecaries' system. Originally, the terms and symbols used to describe the volume measurements of liquids were the same as or similar to those used to describe weight measurements of solids [33] (for example, the pound by weight and the fluid pint were both referred to ...
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