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EN
The Gallery of Mediaeval Art o f the National Museum in Warsaw features a Late Gothic statue of the Virgin and Child from the retable, formerly held in the church at Niedźwiedzica (district Malbork). The artistic level of this carving has attracted attention of art historians since long time. In 1996 the Laboratory of Conservation of the National Museum undertook the conservation of this statue, that enhanced its aesthetic values by filling numerous gaps of polychromy, restoring colours etc. Recently a model of the statue indubitably used by the artist was defined. J. Bier, the eminent expert on the oeuvre of Tilman Riemenschneider pointed to a wooden statue, now in a private collection in Zurich, as to a carver’s model, executed by Riemenschneider himself or in his workshop. A comparison of the Warsaw figure with the statue, discussed by Bier, indicates that the carver of the former one must have used a model combining the features of the Virgin and Child in Zurich with those of other Madonnas by Riemenschneider. A survey of these statues and their scientifically established chronology made it feasible to determine what has been borrowed from Riemenschneider’s model, as well as to precise the date of the Warsaw statue. The Riemenschneider’s model underlies the composition of numerous statues of the Virgin and Child executed in various European milieux. Their list remains far from complete.
EN
This study presents a new and original method of cleaning the surface of marble statues from plaster and impurities. The task was performed with the technique of electrodialysis, employing ionselective membranes. The statue was placed in a chamber filled with destilled water; the bottom of the chamber was covered with marble chips. The electrode chambers contained 01, n NaCl. The cleansing process which lasted uninterrupredly for 14 days, was carried out with a difference of potential amounting to 20 v. The pH level in the chamber was controlled; the same holds true for the presence of sulfate ions in the leakage from the outer chamber of the anode complex. All layers of plaster were completely removed from the surface of the object in question.
EN
This is a translation of an article which was published for the first time in a brochure entitled „Preservation Technotes”, National Park Service. U. S. Department of the Interir, Washington. D. C., Metals, number 1, August 1989, and subsequently in a report from a symposium on ,Air Pollution and Historical Monuments in Cracow”, held on 21-18June 1989 in Cracow (publ. US/ICOMOS, Washington D. C., 1991). The author discusses in great detail the conservation o f the bronze Tadeusz Kościuszko monument in Washington D. C. The removal of pollutants, bird droppings, and dirt was followed by washing the surface with a non-ionizing detergent and wallnut shell blasting. Universally applied sand blasting was considered as overly aggressive for the bronze surface which was then treated with anti-corrosion inhibitors, a protective coating of wax and buffed. Yearly control is foreseen.
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