A Minimum-Impact Method for Measuring Corrosion Rate of Steel-Hulled Shipwrecks in Seawater

Current research on USS Arizona is focused on a minimum-impact technique for calculating corrosion rate of the battleship's steel hull by analysing physical and chemical properties of marine encrustation covering the exposed hull. An equation is derived that allows concretion thickness, density, and total iron content to be used to calculate corrosion rate of steel hull plate.
© 2006 The Authors     

Investigating archaeological site formation processes on the battleship USS Arizona using finite element analysis

Scientists from the National Institute of Standards and Technology (NIST) worked in a collaborative partnership with archaeologists from the National Park Service's (NPS) Submerged Resources Center (SRC) to develop a finite element model (FEM) of the battleship USS Arizona. An FEM is a computer-based engineering model that calculates theoretical stresses, propagation of force, and shape changes to a structure under loads using thousands or even millions of individual elements whose individual responses are well understood. NIST researchers created an FEM of an 80 ft. (25 m) midships section of the Arizona site to analyze archaeological site formation processes on the sunken battleship, in particular to determine the current condition of the wreck and predict its future strength and structural integrity as it continues to corrode. The NIST's FEM study is one aspect of a larger project under the direction of the NPS, the USS Arizona Preservation Project, whose goal is to determine the nature and rate of corrosion affecting USS Arizona, and to model its long-term structural deterioration. The FEM incorporates findings from other key components of the USS Arizona Preservation Project, such as steel hull corrosion rates, structural surveys of the vessel, sediment compaction studies, and analysis of the concretion that covers the ship's hull, into a single tool that is being used to predict how the wreck will degrade in the future.     

To Watch or Restrain: Female Convict Prisons in 19th-Century Tasmania

As institutions established to manage exiled British felons, the Tasmanian female factories consisted of four women's prisons located throughout the island colony. The material world of these institutions mediated internal power relations. Superintendents, Convict Department Officials, and the female prisoners themselves manipulated site landscapes. Today, one of these institutions remains as a managed historic site. Tourists experience a tidy and unthreatening landscape of Australia's heroic convict heritage. By juxtaposing excavated archaeological remains with public presentations of convict sites, I explore the position of female convicts from the original penal landscape to the shadows of Australian history.     

“That’s Just a Family Thing, You Know”: Memory, Community Kinship, and Social Belonging in the Hagg Cottages of Cheshire, North-West England

The Alderley Sandhills Project (ASP) was designed to archaeologically explore the transformative roles of industrialization and de-industrialization on the working communities of rural England. Collection of oral histories was an intrinsic element of fieldwork, with project participants including elderly former residents and neighbors of the excavated cottages. Their narratives provided a crucial source for understanding social meanings of the archaeological objects and places within this study site, particularly over the inter-war decades of the early twentieth century. Drawing from elements of this multi-year project, this paper will explore the dynamic maintenance of community life through the composition of social memories, and the materiality of social belonging, to illuminate the inner world of the Hagg Cottages of Alderley Edge, Cheshire.     

Ghosts of Sorrow,Sin and Crime: Dark Tourism and Convict Heritage in Van Diemen’s Land,Australia

Established as a British imperial penal colony, Van Diemen’s Land received approximately 75,000 convicts before cessation of convict transportation in 1853. A vast network of penal stations and institutions were created to accommodate, employ, administer, and discipline these exiled felons. Popular interpretations of Australia’s convict past highlight dynamics of shame, avoidance and active obliteration that characterized Australia’s relationship to its recent convict past. Yet, closer examination of these colonial institutions suggests a far more ambivalent relationship with this “dark heritage,” evidenced by continuous tourism and visitation to these places of pain and shame from the mid-nineteenth century to the present.