The Local versus the Global in the History of Relativity: The Case of Belgium

This article contributes to a global history of relativity, by exploring how Einstein's theory was appropriated in Belgium. This may sound as a contradiction in terms, yet the early-twentieth-century Belgian context, because of its cultural diversity and reflectiveness of global conditions (the principal example being the First World War), proves well-suited to expose transnational flows and patterns in the global history of relativity. The attempts of Belgian physicist Th\'eophile de Donder to contribute to relativity physics during the 1910s and 1920s illustrate the role of the war in shaping the transnational networks through which relativity circulated. The local attitudes of conservative Belgian Catholic scientists and philosophers, who denied that relativity was philosophically significant, exemplify a global pattern: while critics of relativity feared to become marginalized by the scientific, political, and cultural revolutions that Einstein and his theory were taken to represent, supporters sympathized with these revolutions

How "Facts" Shaped Modern Disciplines: The Fluid Concept of Fact and the Common Origins of German Physics and Historiography

This history of the concept of fact reveals that the fact-oriented practices of German physicists and historians derived from common origins. The concept of fact became part of the German language remarkably late. It gained momentum only toward the end of the eighteenth century. I show that the concept of fact emerged as part of a historical knowledge tradition, which comprised both human and natural empirical study. Around 1800, parts of this tradition, including the concept of fact, were integrated into the epistemological basis of several emerging disciplines, including physics and historiography. During this process of discipline formation, the concept of fact remained fluid. I reveal this fluidity by unearthing different interpretations and roles of facts in different German contexts around 1800. I demonstrate how a fact-based epistemology emerged at the University of G\"ottingen in the late eighteenth century, by focusing on universal historian August Ludwig Schl\"ozer and the experimentalist Georg Christoph Lichtenberg. In a time of scientific and political revolutions, they regarded facts as eternal knowledge, contrasting them with short-lived theories and speculations. Remarkably, Schl\"ozer and Lichtenberg construed facts as the basis of Wissenschaft, but not as Wissenschaft itself. Only after 1800, empirically minded German physicists and historians granted facts self-contained value. As physics and historiography became institutionalized at German universities, the concept of fact acquired different interpretations in different disciplinary settings. These related to fact-oriented research practices, such as precision measurement in physics and source criticism in historiography

History as a Tool for Natural Science: How Ernst Mach Applied Historical Methods to Physics

Historical methods have long been put to use in the making of natural knowledge. In this article, I examine the use of historical methods by nineteenth-century physicists, focusing on the Austrian researcher Ernst Mach in particular. I argue that Mach applied methods characteristic of the then-dominant historical and philological disciplines to his own discipline of physics. He construed history as a tool for the physicist. On the basis of a study of his notebooks and correspondence with the chemist-turned-historian Emil    Wohlwill, I explain what he sought to achieve by means of this tool, and reconstruct the practices characterizing his historical research. These practices included the reading, ordering, and comparison of textual sources. Moreover, Mach appropriated the historical-philological method of source criticism. I show that prominent fellow physicists of Mach, including Johann Poggendorff and Hermann von Helmholtz, made use of similar historical methods, even though their aims were different. Together, the cases of these history-writing physicists illustrate how history and natural science continued to intertwine in a time of increasing disciplinary fragmentation

The Local versus the Global in the History of Relativity: The Case of Belgium

This article contributes to a global history of relativity, by exploring how Einstein’s theory was appropriated in Belgium. This may sound as a contradiction in terms, yet the early-twentiethcentury Belgian context, because of its cultural diversity and reflectiveness of global conditions (the principal example being the First World War), proves well-suited to expose transnational flows and patterns in the global history of relativity. The attempts of Belgian physicist Théophile de Donder to contribute to relativity physics during the 1910s and 1920s illustrate the role of the war in shaping the transnational networks through which relativity circulated. The local attitudes of conservative Belgian Catholic scientists and philosophers, who denied that relativity was philosophically significant, exemplify a global pattern: while critics of relativity feared to become marginalized by the scientific,political, and cultural revolutions that Einstein and his theory were taken to represent, supporters sympathized with these revolutions

The Concept of Fact in German Physics around 1900: A Comparison between Mach and Einstein

The concept of fact has a history. Over the past centuries, physicists have appropriated it in various ways. In this article, we compare Ernst Mach and Albert Einstein's interpretations of the concept. Mach, like most nineteenth-century physicists, contrasted fact and theory. He understood facts as real and complex combinations of natural events. Theories, in turn, only served to order and communicate facts efficiently. Einstein's concept of fact was incompatible with Mach's, since Einstein believed facts could be theoretical too, just as he ascribed mathematical theorizing a leading role in representing reality. For example, he used the concept of fact to refer to a generally valid result of experience. The differences we disclose between Mach and Einstein were symbolic for broader tensions in the German physics discipline. Furthermore, they underline the historically fluid character of the category of the fact, both within physics and beyond.Comment: Physics in Perspective, 202

Neither slim nor fat: estimating the mass of the dodo (Raphus cucullatus, Aves, Columbiformes) based on the largest sample of dodo bones to date

The dodo (Raphus cucullatus) might be the most enigmatic bird of all times. It is, therefore, highly remarkable that no consensus has yet been reached on its body mass; previous scientific estimates of its mass vary by more than 100%. Until now, the vast amount of bones stored at the Natural History Museum in Mauritius has not yet been studied morphometrically nor in relation to body mass. Here, a new estimate of the dodo’s mass is presented based on the largest sample of dodo femora ever measured (n = 174). In order to do this, we have used the regression method and chosen our variables based on biological, mathematical and physical arguments. The results indicate that the mean mass of the dodo was circa 12 kg, which is approximately five times as heavy as the largest living Columbidae (pigeons and doves), the clade to which the dodo belongs