The 1830s and 1840s witnessed a European movement to accumulate data about the terrestrial environment, enterprises including the German and British geomagnetic crusades. This movement was not limited to geomagnetic studies but notably included an important meteorological component. By focusing on observation practices in sedentary and expeditionary contexts, this paper shows how the developing fields of geomagnetism and meteorology were then intimately interlinked. It analyses the circulation and cross-connections of the practices and discourses shared by these two research fields. Departing (...) from a Humboldtian historiography, the paper especially stresses the role of Adolphe Quetelet, director of the Brussels Observatory, whose importance in the development of the earth sciences has until now been largely neglected. It reassesses the involvement of the French scientific community in the British and German geomagnetic crusades, moving beyond the well-known account of Arago's opposition to these undertakings. It is hoped thereby to contribute to a better historical understanding of the renewal of the earth sciences in the second quarter of the nineteenth century. (shrink)

Stargazing Knight Errant, beware of the day When the Hottentots catch thee observing away! Be sure they will pluck thy eyes out of their sockets To prevent thee from stuffing the stars in thy pocketsIf Herschel should find a new star at the Cape, His perils no longer would pain us He will salt the star's tail to prevent its escape And call it ‘The Hottentot Venus’.Astronomy has long been recognized as a tool of empire. Its service to navigation and (...) geography have made it indispensable to European expansion. Britain in particular excelled at this brand of control; each day when the sun set on the British empire, its telescopes continued to enhance imperial power.While the above claims are no longer controversial, we have hardly begun to understand the extent to which imperialism subsequently changed the nature of the physical sciences. (shrink)