This article investigates innovation and knowledge circulation in the North Staffordshire Potteries during the eighteenth and early nineteenth centuries. It evaluates new empirical evidence of formal and informal patterns of knowledge creation and dissemination in order to highlight tensions between forms of open knowledge sharing and the private appropriation of returns to innovative activity. By presenting new patent data it shows that formal protection was not a widespread strategy in the industry. It uses patent specifications to determine what types of knowledge were, and could be, patented in the district, and by whom. A range of sources are used to demonstrate evidence of innovation and knowledge appropriation outside of the patent system. The article identifies distinct types of knowledge in the industry and shows how differences in these led to a range of strategies being employed by potters, with the role of secrecy highlighted as a particularly prevalent and effective strategy.

This article uses trade directories and notifications in the London Gazette to reconstruct the Potteries industrial district at the firm level for 1781 to 1851, a dynamic period of growth for a knowledge-intensive industry. It cuts across the organizational spectrum of the district in terms of the scale and scope of firms traditionally examined by including both the larger lead-firms and the smaller firms for which limited or no business records survive. It addresses difficulties associated with analysis of early clusters before the late nineteenth century. Directories offer a consistent series of records that, when cross-referenced with the Gazette and local newspapers, allow for detailed examination of firm behavior and the structure of the district during a formative growth period. Analysis highlights patterns of cooperative competition in an industry in which tacit knowledge played a crucial role as a source of competitive advantage, raises questions for future research, and provides an empirical base on which to consider further investigation of the trees that made up the forest.