Many historians today prefer to speak of knowledge and practice rather than science and technology. Here I argue for the value of reinstating the terms science, techniques and technology as tools for a more precise analysis of governmentality and the workings of power. My tactic is to use these three categories and their articulations to highlight flows between matter and ideas in the production and reproduction of knowledge. In any society, agriculture offers a wonderfully rich case of how ideas, material goods and social relations interweave. In China agronomy was a science of state, the basis of legitimate rule. I compare different genres of agronomic treatise to highlight what officials, landowners and peasants respectively contributed to, and expected from, this charged natural knowledge. I ask how new forms of textual and graphic inscription for encoding agronomic knowledge facilitated its dissemination and ask how successful this knowledge proved when rematerialized and tested as concrete artefacts or techniques. I highlight forms of innovation in response to crisis, and outline the overlapping interpretative frameworks within which the material applications of Chinese agricultural science confirmed and extended its truth across space and time.

Solar microscopes and their techniques attracted particular attention in the second half of the eighteenth century. This paper investigates the grounds for this interest. After a general introduction to the solar microscope, it discusses the use of original instruments to gain access to the visual culture of solar microscopes and the issues raised by these re-enactments. Experiences involved in this process serve as a basis for reassessing the original source materials. Thence emerges a different account of the meaning of the solar microscope in the eighteenth century and possible reasons for its popularity.

The paper describes the author's witnessing of images projected from an eighteenth-century solar microscope made by John Dollond, now at the Deutsches Museum in Munich. Peter Heering facilitated this session as part of his research on the solar microscope. A rectangular mirror, the length of a hand, mounted outside a museum window caught the sunlight and directed it indoors into the microscope's optical tube with its specimen. Astonishing detail was displayed in the resulting image projected onto a screen at human height. Crisply delineated scales patterned the image cast by a historical specimen of a butterfly wing. Observers interacted fluidly with these images in the very dark room. In sharing what we noticed, questioned and conjectured, we contributed to a temporary community. These participant interactions relate to Steven Shapin and Simon Schaffer's notion that, in the seventeenth century, Robert Boyle used witnessing as a ‘collective act’. Here, the ‘collective act’ spanned participation across history. For example, Robert Hooke's 1665 Micrographia inspired Philip and Phylis Morrison's workshop during my college years and their collaboration with the Eames Office on a film depicting travel through ‘powers of ten’, based on Kees Boeke's 1957 picture book. Personal memories were extended and informed by historical experiences, both for Robert Hooke's subsequent interpreters and for Peter Heering's participants.

The British Association for the Advancement of Science sought to promote the understanding of science in various ways, principally by having annual meetings in different towns and cities throughout Britain and Ireland (and, from 1884, in Canada, South Africa and Australia). This paper considers how far the location of its meetings in different urban settings influenced the nature and reception of the association's activities in promoting science, from its foundation in 1831 to the later 1930s. Several themes concerning the production and reception of science – promoting, practising, writing and receiving – are examined in different urban contexts. We consider the ways in which towns were promoted as venues for and centres of science. We consider the role of local field sites, leading local practitioners and provincial institutions for science in attracting the association to different urban locations. The paper pays attention to excursions and to the evolution and content of the BAAS meeting handbook as a ‘geographical’ guide to the significance of the regional setting and to appropriate scientific venues. The paper considers the reception of BAAS meetings and explores how far the association's intentions for the promotion of science varied by location and by section within the BAAS. In examining these themes – the geographical setting of the association's meetings, the reception of association science in local civic and intellectual context and the importance of place to an understanding of what the BAAS did and how it was received – the paper extends existing knowledge of the association and contributes to recent work within the history of science which has emphasized the ‘local’ nature of science's making and reception and the mobility of scientific knowledge.

This paper explores the history of radio echo-sounding (RES), a technique of glaciological surveying that from the late 1960s has been used to examine Antarctica's sub-glacial morphology. Although the origins of RES can be traced back to two accidental findings, its development relied upon the establishment of new geopolitical conditions, which in the 1960s typified Antarctica as a continent devoted to scientific exploration. These conditions extended the influence of prominent glaciologists promoting RES and helped them gather sufficient support to test its efficiency. The organization and implementation of a large-scale research programme of RES in Antarctica followed these developments. The paper also examines the deployment of RES in Antarctic explorations, showing that its completion depended on the availability of technological systems of which RES was an integral part.