The Mystery of wet walls of Astronomical clock Solved.

Dampness that threatens the complex mechanism of Prague Astronomical clock has a simple originator: salt. It results from the chemical analysis, made by the laboratory of The National Institute for Heritage Preservation.

“Astronomical clock is in a locality that is seasonally salted on a long term basis” Ivana Kopecka, the manager of the laboratory explains. The other source of salt are nitrates in the floor of the building, originating from decaying biological material. It is for example domestic waste from times of no sanitation system. Earlier harsh repair works (including improper plaster) also contributed to the present state of the walls.

The National Institute for Heritage Preservation analysis also suggests, how to get the Astronomical clock rid of salt and so of dampness: “We suggest to put the present plaster off the walls, and to put on a special plaster which would absorb salt and is easily changeable for a new one.

Damp stains extends from the ground floor to upper floors. They appeared after the floods in 2002 for the first time. Wetness can be the reason of increasingly frequent malfunctions of the sight.

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