Search results
Results From The WOW.Com Content Network
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.
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]
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
A guillotine lock is a type of canal lock. The lock itself operates on the same principle as any normal pound lock , but is unusual in that each gate is a single piece, usually of steel , that slides vertically upwards when opened to allow a boat to traverse underneath.
The Pound–Drever–Hall (PDH) technique is a widely used and powerful approach for stabilizing the frequency of light emitted by a laser by means of locking to a stable cavity. The PDH technique has a broad range of applications including interferometric gravitational wave detectors , atomic physics , and time measurement standards , many of ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Marlow Lock is a lock and weir situated on the River Thames in the town of Marlow, Buckinghamshire, England, about 300m downstream of Marlow Bridge. The first pound lock was built by the Thames Navigation Commission in 1773.
If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!