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Home > Locks (Water Transport): Lock, Karl Johanslussen, Panama Canal Locks, Louis Joubert Lock, Industrial Canal Lock, Caisson Lock, Black Sluice, Canal Pound, Marala Headworks, F(English)
Locks (Water Transport): Lock, Karl Johanslussen, Panama Canal Locks, Louis Joubert Lock, Industrial Canal Lock, Caisson Lock, Black Sluice, Canal Pound, Marala Headworks, F(English)

Locks (Water Transport): Lock, Karl Johanslussen, Panama Canal Locks, Louis Joubert Lock, Industrial Canal Lock, Caisson Lock, Black Sluice, Canal Pound, Marala Headworks, F(English)

          
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About the Book

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 32. Chapters: Lock, Karl Johanslussen, Panama Canal Locks, Louis Joubert Lock, Industrial Canal Lock, Caisson lock, Black Sluice, Canal pound, Marala Headworks, Freycinet gauge, Goejanverwellesluis, Rasul Barrage, Flash lock, Guillotine lock, Taunsa Barrage, Control lock, Lock keeper, Minuma Ts sen-bori, Weigh lock, Balance lock. Excerpt: A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to take a reasonably direct line across land that is not level. A pound lock is a type of lock that is used almost exclusively nowadays on canals and rivers. A pound lock has a chamber (the pound) 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. Pound locks were used in ancient China during the Song Dynasty (960-1279 AD), having been pioneered by the government official and engineer Qiao Weiyo in 984. They replaced earlier double slipways that had caused trouble and are mentioned by the Chinese polymath Shen Kuo (1031-1095) in his book Dream Pool Essays (published in 1088), and fully described in the Chinese historical text Song Shi (compiled in 1345): The distance between the two locks was rather more than 50 paces, and the whole space was covered with a great roof like a shed. The gates were 'hanging gates'; when they were closed the water accumulated like a tide until the required level was reached, and then when the time came it was allowed to flow out....


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Product Details
  • ISBN-13: 9781156953945
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 34
  • Series Title: English
  • Sub Title: Lock, Karl Johanslussen, Panama Canal Locks, Louis Joubert Lock, Industrial Canal Lock, Caisson Lock, Black Sluice, Canal Pound, Marala Headworks, F
  • Width: 189 mm
  • ISBN-10: 1156953944
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Weight: 82 gr


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