NEUTRON TOMOGRAPHY AS A VALUABLE TOOL FOR THE NON‐DESTRUCTIVE ANALYSIS OF HISTORICAL BRONZE SCULPTURES

This paper explains, with the example of a Roman object (the ‘Mars from Oberweningen’, Switzerland), why neutrons can be used preferentially for the non‐destructive analysis of metallic objects of relatively large size. This method is superior to the conventional X‐ray tomography method due to the higher penetration ability in metals such as copper, tin and even lead. With this method, differing materials can also easily be differentiated. In this way, the inner and outer structures of objects can be observed with the help of tools based on mathematical algorithms. Slices at arbitrary positions and segmentation of different material clusters aid the understanding of manufacturing processes and can describe the present preservation status. This helps in selecting optimal and additional conservation measures in museums for further preservation. Beside the qualitative overview on structure and inner properties of the objects, quantitative information can be derived about material content and composition. This method and the subsequently needed facilities for this method are available at PSI for similar studies on demand.     

THE WRITING'S IN THE WALL: A REVIEW OF NEW PRELIMINARY APPLICATIONS OF ELECTRICAL RESISTIVITY TOMOGRAPHY WITHIN ARCHAEOLOGY

Natural processes are known to cause significant damage to archaeological monuments. In fact, the key to understanding the decay of building materials is the internal movement of water through the mineral matrix, which influences the distribution of chemical, physical and biological deterioration processes. Electrical resistivity tomography (ERT) was traditionally used as a surveying tool within archaeology, but a new high‐resolution technique that accurately traces the movement of moisture in building materials could provide a vital tool for understanding the decay of many archaeological monuments. This paper considers current progress, the shift of ERT from soil to rock research and the impact that this development could have on future conservation, using Hertford College (Oxford) and Neolithic rock art (Golden Gate Reserve, South Africa) as case studies.     

A HYBRID APPROACH TO CREATE AN ARCHAEOLOGICAL VISUALIZATION SYSTEM FOR A PALAEOLITHIC CAVE

This paper presents a visualization system based on metric data to manage and disseminate archaeological information on the Internet. We describe the integration of two different types of sensors: laser scanning and close‐range photogrammetry. How we created an automatic and hierarchical approach based on processing and matching the images coming from a digital camera and a terrestrial laser scanner is also shown. This development has created a visualization system combining spherical photographs and georeferences for graphical and numerical data acquired by the sensors. The case study where we have applied this method is the Palaeolithic rock art of the Llonín Cave (Asturias, Spain), which has been declared a World Heritage Site by UNESCO and has restricted public access. Our results demonstrate that this tool integrates data, metadata, services and information, which simplifies the location, identification, selection and management of archaeological information.     

Imagining the Grand Duchy of Lithuania: The Politics and Economics of the Rebuilding of Trakai Castle and the ‘Palace of Sovereigns’ in Vilnius

Abstract

In 1884 the prominent nation-builder Jonas Basanavi?ius declared that castle mounds and literature were the only appropriate elements from which to build the Lithuanian nation. Basanavi?ius’s view, this article suggests, had a lasting influence on the public uses of history in twentieth-century Lithuania. The study explores the construction of two iconic images of the Grand Duchy of Lithuania, Trakai Castle and the ‘Palace of Sovereigns’ in Vilnius. Built in the fourteenth and fifteenth centuries, Trakai Castle was once the seat of the Grand Duke of Lithuania, but fell into neglect before its reconstruction in the 1960s. Dating back to the thirteenth century, the Palace in Vilnius deteriorated during the eighteenth century, was dismantled at the beginning of the nineteenth, and has been completely rebuilt since 2000. It is striking that the reconstructions of castles were the largest state investments in culture in both the Soviet and post-Soviet regimes. The reconstruction of Trakai Castle was criticized on economic and ideological grounds by Nikita Khrushchev. The rebuilding of the Palace polarized Lithuanian intellectuals. The presentation compares the intellectual, social, and political rationales which underpinned the two projects and explores the changes and continuities in the uses of the Grand Duchy of Lithuania under the Soviet and post-Soviet regimes.     

Legislation as an Instrument in South African Heritage Management: Is It Effective?

Abstract

Heritage management and cultural legislation have always existed in the African continent, even before the days of written laws. However, it is often perceived that it was with the 'taking over' of the continent that civilization and heritage legislation were first implemented. The 'new' legislation did not recognize the indigenous means of management and ignored the fact that heritage sites have existed long prior to the scramble for the continent. The first enacted legislation in South Africa was distinctively biased towards the Bushmen heritage. I argue that this was probably because it was not politically problematic as Bushmen were considered to be a dying nation with a culture going 'extinct'. Having legislation that promoted the heritage of the people you were colonizing might not have been strategically correct. Legislation over the years moved away from the 'Bushmen culture' to protecting colonial heritage sites. Whilst the post-colonial heritage legislation has improved on the previous legislation — as can be shown by its success in courts — there are still areas of concern. I find the whole heritage framework represented by the legislation to still be clearly non-African, with a top-down approach that has not much respect for African culture, especially the values that clash with Eurocentric ones. I conclude that indeed there has been significant progress made with legislation over the years, from 1911 to 1999 when the current legislation was promulgated. However, a lack of proactive measures from within heritage management, as well as external factors, are still a stumbling block to a successful implementation of heritage legislation and as a result heritage is still threatened.     

INVESTIGATING MATERIAL DECAY OF HISTORIC BUILDINGS USING VISUAL ANALYTICS WITH MULTI‐TEMPORAL INFRARED THERMOGRAPHIC DATA

This paper shows how visual analytics methodology can be used to facilitate interpretation of multi‐temporal thermographic imagery for the purpose of restoration of cultural heritage. We explore thermographic data in a visual environment from the unifying spatio‐temporal perspective in an attempt to identify spatial and spatio‐temporal patterns that could provide information about the structure and the level of decay of the material, and the presence of other physical phenomena in the wall. The approach is tested on a thermographic dataset captured on the façade of a Romanesque building from the 13th century—the Cathedral in Matera (Italy).     

Information Retrieval in Cultural Heritage

Abstract

This article discusses the opportunities and challenges of applying modern information retrieval techniques to the cultural heritage domain. Although the field of information retrieval is closely associated with computer science, it originally emerged from library science — also one of the main disciplines concerned with access to cultural heritage material. Hence we are, in a sense, exploring what happens if we bring these strands of research back together again. The article consists of three parts. In the first part, we explain the field of information retrieval and its multidisciplinary nature. In the second part, we discuss how and why the problem of providing access to cultural heritage can be cast naturally as an information retrieval problem. In the third and main part, we present a detailed case study of applying the modern information retrieval approach in practice within a museum.