As sociologists learn more about how scientific knowledge is created, they give historians the opportunity to rework their accounts from a more contextual perspective. It is relatively easy to do so in areas with large theoretical, cosmological or overtly ideological components. It is more difficult, but equally necessary, to open up very empirical accomplishments, and recent sociological analysis of the process of science gives us some interesting insights. This paper employs some of these on the apparently unpromising subject of the (...) ‘discovery of secular magnetic variation’ in 1634 by the Gresham professor Henry Gellibrand. (shrink)

Historians must have an understanding of the present both to reconstruct the past and to explain that reconstruction to a contemporary audience. One criticism of presentism is that it is an interpretation of the past in terms of current values and ideas, and fails to provide a complete picture of the historical context. Regardless of such practices, however, the historian is limited to the methodological and archival tools available during his own time. Meaning, reason, and truth are different for different (...) periods and peoples. The clarity of his language, the consistency of his logic, and the validity of his proofs are relative to the historian's time and culture. The act of historical inquiry is influenced by the contrasts between past and present. Only by consciously addressing his dependence on the present can the historian adequately understand the past. (shrink)

The magnet served three interests of Restoration mechanical philosophers: it provided a model of cosmic forces, it suggested a solution to the problem of longitude determination, and evidence of its corpuscular mechanism would silence critics. An implicit condition of William Gilbert's ‘magnetic philosophy’ was the existence of a unique, immaterial magnetic virtue. Restoration mechanical philosophers, while claiming descent from their compatriot, worked successfully to disprove this, following an experimental regime of Henry Power. Magnetic philosophy lost its coherence and became subsumed (...) in the study of effluvia. This contradiction of a distinct, yet mechanical magnetic philosophy came to a head in 1684 in an argument between Robert Hooke and Martin Lister. An effluvial explanation of magnetism introduced great complexity to the North-seeking behaviour of compass needles, and undermined the already troubled longitude programme. Thus magnetic philosophy no longer furthered the interests which had maintained it, and it was abandoned. (shrink)