This paper tries to motivate three desiderata for historical epistemologies: (a) that they should be reflective about the pedigree of their conceptual apparatus; (b) that they must face up to the potentially relativistic consequences of their historicism; and (c) that they must not forget the hard-won lessons of microhistory (i.e. historical events must be explained causally; historical events must not be artificially divided into internal/intellectual and external/social “factors” or “levels”; and constructed series of homogenous events must not be treated as (...) quasi-organisms). Ian Hacking’s work on styles of reasoning and Lorraine Daston’s and Peter Galison’s investigation into epistemic virtues are used to identify the costs of neglecting these desiderata. (shrink)

Abstract…observations of skylfull pylotts is the onlye waye to bring it in rule; for it passeth the reach of naturall philosophy. – Michael Gabriel, 1576 (Collinson, 1867, p. 30)Abstract The tension between empirical data and formal theory pervades the entire history of geomagnetism, from the Middle Ages up to the present day. This paper explores its early-modern history (1500–1800), using a hybrid approach: it applies a methodological framework used in modern geophysics to interpret early-modern developments, exploring to what extent formal (...) conjectures shaped observation and vice versa. A range of pertinent case studies supports classification of this entire period as proto-scientific, characterised by the initial formation of theories being largely disconnected from observational constraints, and their subsequent evolution being advanced primarily by their empirical falsification, and not necessarily associated with the introduction of an alternative. The few exceptional instances of purely data-driven discovery were essentially due to an improved signal-to-noise ratio. (shrink)