The social agency of instruments of surveying and exploration c.1830-1930.

This paper utilizes the concept of the agency of material objects, proposed as a tenet by several historians of science in the late twentieth century. It argues that scientific instruments have agency in the field due to their value and fragility, both of which attributes served to dictate a social hierarchy of activity. Furthermore, the resulting numerical outputs served to discriminate between various groups. The principal focus is the role of instruments used by travellers sponsored by the Royal Geographical Society, London, but it also looks at the role of instruments on a larger triangulation; the project to survey the African part of the arc of the 30th meridian east of Greenwich. Seeing the instruments as material objects allows insights into the social arrangements and interactions taking place. It is argued that instruments, and the results of instrument use, entrenched existing power hierarchies, imparting greater prestige to those who were previously endowed with privilege. It is argued the instruments contributed to 'othering' both in the field and in the publications resulting from the expeditions.