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Monitoring & metering


Juselius Mausoleum. Copyright: Tiina Sonninen


sandstone walls and interiors richly decorated with frescos, the mausoleum presents a major preservation challenge. The original frescos were destroyed in the early years by excess moisture, and were repainted later. The Jusélius Foundation, which owns and maintains the building, has recently invested in the latest technology to continuously monitor humidity and temperature to keep this exceptional building in good condition. This monitoring capability is growing in importance as climate change increases the frequency of precipitation. The Sigrid Jusélius Mausoleum was


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commissioned by Fritz Arthur Jusélius (1855-1930), in memory of his daughter Sigrid Maria, who was born in 1887, but died of tuberculosis at the age of 11.The architect Josef Stenbäck worked with Jusélius on the project in conjunction with the famous painter, Akseli Gallen-Kallela. Built in the neo-Gothic style, the octagonal


building is adjoined on the east side by a small vestibule and on the west side by a semi- circular chancel. The vaults and walls in the central part are supported by buttresses and the high windows are topped by triangular pediments. The base was built of Finnish grey granite and the façade was made of yellow sandstone from local coastal areas. Akseli Gallén-Kallela painted the frescos on the interior walls and the ceiling in 1901–1902. The frescos represent folklore and symbolism and typify Gallen-Kallela’s national romantic style. The themes of the paintings come from the Kalevala tradition and the Bible, but they also show references to theosophy and occultism. Together with the mausoleum, they form a unique entity in Finnish art history.


Damaging environmental effects


In an unheated and unventilated building made of porous sandstone, the frescos started to decay almost immediately. Moisture penetrated the


sandstone walls, dissolving the potassium nitrate in the mortar, and the water-soluble salts in the


Monitoring the effects of climate change in


historic buildings 26 April 2021 Instrumentation Monthly


he Sigrid Jusélius mausoleum was built in 1901-03 and is a significant cultural site in Pori, Western Finland. With


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