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Search "Lock"
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About 33 pages (9,947 words) in 3 products |
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Encyclopedia and Summary Information
summary from source:
 Canal and Canal Lock Summary
599 words, approx. 2 pages Canals—manmade waterways—divert water from natural sources to facilitate transportation, irrigate or drain land, and supply water. Irrigation canals were a feature of most ancient civilizations. The Nahrwan Canal, l85 mi. (300 km) long, was... summary from source:
 Lock Information
9,199 words, approx. 31 pages
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 whose water level can be varied; whereas in a caisson lock, a boat... 
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About 33 pages (9,947 words) in 3 products |
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