Graduation tower

Bad Kissingen, Germany
Ciechocinek, Poland
Close-up view of brushwood with mineral deposits

A graduation tower (occasionally referred to as a thorn house[1]) is a structure, used in the production of salt, that 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) that have to be changed every five to ten years, as they become encrusted with mineral deposits over time.[2] 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[by whom?] as having beneficial health effects similar to that of breathing in sea air.[citation needed]

Large graduation tower complexes are located in Ciechocinek and Inowrocław, Poland.[2] Ciechocinek's entirely wooden construction was erected in the 19th century by Stanisław Staszic. The complex consists of three towers, with a total length of over 2 km. Many tourists visit it for health reasons.[citation needed]

Partial list of towns and cities with graduation towers

View from the top of the tower at Ciechocinek, Poland
Bad Dürkheim
Bad Reichenhall

With years of initial construction where available. Does not include modern indoor facilities found in some spas.

France
Germany
Poland
Romania
United Kingdom

References

  1. ^ "Graduation House". www.thermarium.com. Archived from the original on 10 August 2014. Retrieved 9 August 2014.
  2. ^ a b Affelt, Waldemar: Wooden masterwork of saline in Ciechocinek, Poland Archived 2011-09-07 at the Wayback Machine, 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
  3. ^ "Tężnia solankowa". 22 September 2020.
  4. ^ "Graduation towers started on the promenade". www.swinoujscie.pl. Retrieved 11 May 2024.
  5. ^ "The Brine Graduation Tower Wieliczka". www.visitmalopolska.pl. Retrieved 19 September 2022.
  6. ^ "Company brings back salt-making in Scotland using ancient technique". The National. Retrieved 4 June 2023.

Media related to Graduation towers at Wikimedia Commons


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