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Stone deterioration is a non-linear process that is difficult to observe in a short period. The current study documents surface changes related to material loss using terrestrial laser scanner (TLS) and explains the differences in weathering of lithotypes and different wall orientations of various weathering forms. Ruins of a medieval church constructed from weathering-prone porous limestone were surveyed prior to and after a winter period in a five-month interval with two scan phases. Thirty-five stone surfaces of exposed and sheltered wall sections of different compass orientations were compared to assess the short-term material loss and weathering. The study revealed that more than 30% of the selected surfaces show a major surface retreat of more than 4 mm. Three to nine percent of the scanned areas show countable deterioration. The most significant material loss was recorded at rain exposed but partially wind protected walls facing Northeast. Lithology also controls the surface loss and the rate of weathering. Ooidal porous limestone is the most sensitive lithology to weathering. The minor heterogeneities of the stone ashlar and the co-existence of weathered and seemingly intact areas even within one stone block were also considered. Comparing two time-lapses allows for recognizing even minor surface loss. Scans could be made before and after the weathering threshold, but it cannot be predicted when the threshold is reached.
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Since the 19th century, the church of Zsámbék was continuously a focus of scholars' interest. The present paper intends to research the church ruins with a new aspect. Using an accurate terrestrial laser scan survey, the geometry of the plan is analysed in order to find proportions among the dimensions. The main goal of the study is to gather information about the design logic of the first masters of the 13th-century Premonstratensian abbey. In addition, our goal was to detect contributions to the 13th-century construction history of the church, that cannot be found in archives of graphic sources. The latest archaeological excavation achieved excellent results concerning several crucial historical points; however, the periodization of the church is still not entirely clarified. From the 19th century, different scholars have proposed various hypotheses about this topic, without consensus.
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The forgotten frescoes of Zsámbék. The assessment of the frescoes of the Premonstratensian church by a pupil of Giovanni Battista Cavalcaselle in 1895
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