Water Glass An open tube or box having a glass bottom for making observations below the surface of the water. Water Hammer (1) Very rapid pressure wave in a conduit due to a sudden change in flow, the potentially damaging slam, bang, or shudder that occurs in a pipe when a sudden change in water velocity (usually as a result of too-rapidly starting a pump or operating a valve) creates a great change in water pressure. (2) A banging noise in steam pipes, caused by steam bubbles entering a cold pipe partially filled with water.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
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Author of the Water Words Dictionary source of text: Gary A. Horton
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