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Graduation tower



   

A graduation tower consists of a wooden wall-like frame which is stuffed with bundles of brushwood. It increases the concentration of a solution of mineral salts. The salty water runs down the tower, and — through the action of breeze and sun — partly evaporates; at the same time certain mineral content of the solution are left behind on the sticks of brushwood.


 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Graduation_tower". A list of authors is available in Wikipedia.
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