This essay examines the prospects and plans of a family of small-scale French papermakers, the Serves, from the 1780s to the 1830s. It explores the interplay of risk, the state, labor discipline, and technological diffusion. Pierre Serve petitioned the monarchy, the Revolutionary state, and the Napoleonic regime for a subsidy to install Hollander beaters, a machine that macerated rags, in his shops. His son pursued a law to humble the journeymen paperworkers, whose custom and skill continuously challenged the Serves' mastery of their mill. Timely responses from the state, which favored large producers, never came. Consequently, the Serves fell back on their own resources and the market, which determined their fate.

This essay addresses the historiographical question of how to study scientific instruments and the connections between them without rigidly determining the boundaries of the object under historical scrutiny beforehand. To do this, I will explore an episode in the early history of the tachistoscope — defined, among other things, as an instrument for the brief exposure of visual stimuli in experimental psychology. After looking at the tachistoscope described by physiologist Volkmann in 1859, I will turn to the gravity chronometer, constructed by Cattell at Wundt's Leipzig institute of psychology in the 1880s. Taking Wittgenstein's notion of family resemblances as a methodological suggestion to travel from one member to another to find out just how members relate to one another, I will investigate part of the family to which both the tachistoscope and the gravity chronometer turn out to belong. A detailed analysis of these instruments, using both historical sources and historical accounts of psychological instruments, may demonstrate that the instrument is not a standard package that, if well applied, will simply secure good results. Each package needs to be assembled again and again; the particular package that is assembled may differ on different occasions. Thus an alternative is developed to an understanding of instruments as univocally functioning material means.

David Bloor often wrote that Karl Mannheim had “stopped short” in his sociology of knowledge, lacking the nerve to consider the natural sciences sociologically. While this assessment runs counter to Mannheim's own work, which responded in quite specific ways both to an encroaching “modernity” and a looming fascism, Bloor's depiction becomes clearer when considered in the light of his principal introduction to Mannheim's work — a series of essays by Robert Merton. Bloor's reading and appropriation of Mannheim emerged from his background in experimental psychology and his attempts to supercede Merton's own structural-functionalist program for the sociology of knowledge. By retracing this extended trail of readings and re-readings, we may begin to understand the roots of Bloor's curious interpretation of Mannheim's sociology of knowledge, and inquire in a reflexive way about the present and future directions of science studies.

Michael Polanyi (1891–1976) is placed in the ongoing Enlightenment-reform tradition as one of the first twentieth-century scientists to propose a program to correct the gravest internal conflict of the modern Enlightenment project of radical criticism: scientific detachment and moral nihilism in conflict with humanist values. He held that radical criticism leads not to truth but to destructive doubt. Only the inclusion of the “personal element,” the judicial attitude of reasonable doubt and the acknowledgment of belief in the regulative principle of truth can overcome this end. Freedom — to reason, to criticize the method of doubt, and freedom of scientific thinking — is a precondition to reach truth. His epistemology of nonsubjective personal knowledge has redefined scientific knowing and objectivity as grounded in tacit knowing. Debate is continuing on objectivity and freedom versus the social duty of science. Polanyi's Hungarian correspondence highlights his commitment to truth and the contemporary cultural-political situation of Jewish intellectuals.