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A graduation tower (occasionally referred to as a thorn house〔(【引用サイトリンク】title=Graduation House )〕)is a structure used in the production of salt which removes water from a saline solution by evaporation, increasing its concentration of mineral salts. The tower consists of a wooden wall-like frame stuffed with bundles of brushwood (typically blackthorn) which have to be changed about every 5 to 10 years as they become encrusted with mineral deposits over time.〔 The salt water runs down the tower and partly evaporates; at the same time some minerals from the solution are left behind on the brushwood twigs. Graduation towers can be found in a number of spa towns, primarily in Germany but also Poland and Austria. The mineral-rich water droplets in the air are regarded as having beneficial health effects similar to that of breathing in sea air. A large complex of graduation towers is located in Ciechocinek, Poland.〔Affelt, Waldemar: ''(Wooden masterwork of saline in Ciechocinek, Poland )'', in: Santiago Huerta (ed.): Proceedings of the First International Congress on Construction History: Madrid, 20th–24th January 2003, Instituto Juan de Herrera, Madrid 2003, ISBN 84-9728-070-9〕 This entirely wooden construction was erected in the 19th century by Stanisław Staszic. The complex consists of three graduation towers with a total length of over 2 km. Many tourists visit it for health reasons. ==Gallery== File:Bad_Duerrenberg_Gradierwerk_S.jpg|Graduation tower in Bad Dürrenberg File:Gradierwerk.JPG|18th-century schematic File:Aerozol pod teznia.JPG|Aerosol at Ciechocinek facility 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「graduation tower」の詳細全文を読む スポンサード リンク
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