Über die Aufhänge- und Anzeigevorrichtung der ägyptischen Waage der Pharaonenzeit

A number of different and partly contradictory interpretations about the suspension and the indicator system of the ancient Egyptian balance has been given so far. In this article previous explanations of these devices are presented and critically considered; at the same time the balance of the Egyptians is included in the complete evolution of this instrument. Based on original Egyptian colour drawings on papyrus taken from the Book of the Death and considering weighing techniques, it is stated that all interpretations given so far are not capable of providing a satisfactory explanation of the function of these devices. The interpretation given already in 1888 by Sir Flinders Petrie comes closest to the real function of the indicator system: According to his assumption the device consisted of a solid pointer attached to the beam, in relation to which a plumbline was observed after the oscillations had stopped. This interpretation, however, has to be varied or to be complemented by taking into consideration the special drawing technique of the ancient Egyptians: Processes were drawn in a reproduction technique which consisted in the simultaneous combination of a top view and a side view. A new hypotheses about the function of the suspension and the indicator system of the ancient Egyptian balance is presented, which has the advantage of agreeing completely with the Egyptian drawing technique and which, in addition, ensures optimum precision of the weighing procedure.     

Geschichte als leitende Orientierungswissenschaft im 19. Jahrhundert

The nineteenth century has sometimes been dubbed “the age of historical science”, taking account of the hegemonic position occupied by historiography vis-à-vis the natural sciences and also its fellow humanities. The “historical method” was widely adopted by all kinds of Kulturwissenschaften. Moreover, public interest focussed on historiography to a quite exceptional degree since it combined scholarly inquiry and the purposes of general education and personal cultivation. Historiography reached the peak of its influence during the two decades leading up to the revolution of 1848. During this period, the ideas of historians on the national state, on the social order and on cultural affairs carried considerable weight. In the second half of the nineteenth century, historiography gradually lost its position of a “pilot discipline”. Sciences such as economics and sociology were better equipped to respond to the needs of German society in the age of industrialization.     

Spezialisierung und Bildungsanspruch. Zur Geschichte der Technischen Hochschulen im 19. und 20. Jahrhundert

In the late 19th century at the “Technische Hochschulen” the understanding of “Wissenschaft” and “Bildung” changed considerably. During the 19th century the “Polytechnische Schulen” and “Technische Hochschulen” adopted the neo-humanistic standards of “Bildung”, established by the universities and the “Humanistische Gymnasium”. At the end of the century they joined the “realistische Schulbewegung” which emphasized the value of mathematics and natural sciences, taking issue with the classical languages. At the same time, systematic experimentation was added to mathematics, natural sciences and technical experience to constitute the specific methodology of engineering sciences. Attempts to define specific technical elements of “Allgemein-bildung” did not succeed as a result of the rapidly increasing differentiation and specialization of engineering sciences.     

„… daß Sie Ihre Tätigkeit einstellen müssen”︁: Die Entlassung Sergej Tschachotins aus dem Heidelberger Kaiser-Wilhelm-Institut 1933

“…that you must have to stop working here.” How Sergej Chakhotin was forced to leave the Kaiser Wilhelm Institute at Heidelberg in 1933. - In this essay the author presents some basically unpublished material according to the dismissal of the Russian natural scientist Sergej Chakhotin, a former assistant of I. P. Pavlov. Chakhotin, who got a sholarship granted by an American institution, worked since 1930 at the newly established Kaiser Wilhelm Institute at Heidelberg, as a scientist. Moreover, he practically engaged himself in the political struggle of the German Social Democrats against Nazism and, in 1932, created the at that time well-known symbol of the Three Arrows. But he was - being a Soviet citizen - a guest in Germany. His political activity was the very reason for his discharge in April, 1933, and even the engagement of some prominent academic collegues was not able to stop the administration measure. So Chakhotin became a political refugee like some of his German collegues.     

Technische Intelligenz im Exil. Zum Einfluß emigrierter deutschsprachiger Ingenieure auf die Ingenieurwissenschaften in Großbritannien 1933 bis 1945

This article deals with the emigration and the experiences of the professional group of engineers in their British exile, trying to evaluate the influences these refugee engineers had on the British engineering science. The approach is not limited to engineering research at universities or technical colleges, but tries to include the aspect of research and development on the level of the firm. Limits and constraints of gaining influence in British engineering are discussed, such as different values and traditions as well as the different traditions in technical education and the role of the engineering graduate in industry. Finally attempts are made to establish some fields of engineering where an identifiable influence can be traced without exaggerating the general influence of these German speaking refugee engineers. Those identifiable fields are machine tools, fuel technology and district heating.     

Das Problem der “entscheidenden Experimente”

In this historical essay an attempt is made to discuss the problem of decisive experiments both from the point of view of History of Science and of Philosophy of Science. The first part deals with Francis Bacon's idea of instantiae crucis and with the use of the term experimentum crucis mainly in optics. With respect to the experimental confirmation of Maxwell's electrodynamics the Duhem-Quine Thesis is discussed. Duhem had argued that not a single hypothesis but only a complete theory is examined by experiment. So a single experiment neither can prove nor can disprove a single hypothesis. With regard to Bucherer's and Neumann's data concerning the velocity-dependence of the electron's mass the question of the certainty of conclusions arising from experimental tests is treated. In the last parts the really historical problem of the decisive experiments is considered, namely the gap between the context of design of an experiment and the context of evaluation of an experiment in retrospect. The examples here are the Michelson-Morley experiment, the Franck-Hertz experiment, and the Compton-Effect. In the conclusion parity violation is discussed. Perhaps due to the possibility of a single alternative in theory and an unambiguous result of the experiment this test really was crucial. In general, however, the experimentum crucis will prove to be a very seldom event.     

Georges Canguilhem als Medizinhistoriker

The work of the French philosopher Georges Canguilhem is introduced here. Medical historiography is not the ultimate aim of Canguilhems work, but rather a tool for the analysis ef epistemological questions. These questions are to be investigated, as well as the art of medical history that Canguilhem considers to be helpful for such investigations. French ?epistemology”?, a direction of philosophy of science to which Canguilhem belongs, is discussed first. Canguilhem's epistomology does not aim at a rational reconstruction of decontextualized scientific results, but at an historical reconstruction of science. It analyses the functioning of scientific concepts in relation of their historical context. The main themes of Canguilhems work (biological normality, scientific ideology and history of physiology) are summarized in a second part of this study. Finally we investigate the importance of Canguilhem for modern research in history of medicine.