Investigating the production provenance of iron artifacts with multivariate methods

The quest for suitable data, data treatments and statistical methods for identifying the provenance of iron artifacts has led to a variety of analytical strategies. Researchers working on the problem have been slow to develop or adopt the use of multivariate statistical techniques, despite their successful implementation in other archaeomaterials sourcing frameworks. This paper explores the analytical potential of a comprehensive multivariate statistical strategy for identifying the primary production origins of bloomery iron artifacts using bulk chemical analyses of bloomery smelting slag and slag inclusions in iron artifacts. This strategy includes a multivariate model for identifying distinct slag inclusion types introduced during smelting and refining. Principal component analysis and linear discriminant analysis are then applied to smelting slag training sets to create multivariate provenance fields, the chemical distributions of which are defined by kernel density estimation. Single and multi-group evaluation methods are examined. Appropriate data transformations are discussed to facilitate the projection of the chemistry of “unknown” slag inclusions into the multidimensional space generated by the smelting slag groups of known provenance. The efficacy of this strategy is demonstrated through its application to a previously examined data set derived from three iron production experiments and a published archaeological example. Results indicate that an appropriately designed multivariate strategy can be an effective tool for evaluating provenance hypotheses for bloomery iron artifacts.     

The United Kingdom and the Negotiation of the 1969 New York Convention on Special Missions

During 1968–9, members of the United Nations, meeting in the Legal Committee of the General Assembly, negotiated a Convention on Special Missions, sometimes known as the New York Convention, setting out the privileges and immunities of ad hoc embassies between states. The negotiation was part of a process through which the UN sought to clarify the status and rights of official representatives, so that diplomacy could function with security and certainty. This article looks at the role of one leading power, the United Kingdom, in the talks. It explores how British interests were defined, the tactics used to secure them and how London came to terms with pressure from other states to redefine its approach. The focus is on the overall political thrust of the British negotiating position, as formulated mainly by the Foreign Office, rather than the detailed talks on such thorny issues as tax avoidance and diplomatic property. The article shows that, while London was keen to see a codification of diplomatic law, cold-war considerations made it less than enthusiastic about an upsurge in the number of special missions that the New York Convention might encourage.