This article tries to throw some light on the historical development of disinfection, a most active and aggressive form of purifying. Before the "bacteriological revolution" in the 1880s, the theoretical bases of the struggle against epidemics were very vague and diverse, so that "disinfection" and "deodorization" were often synonymous. An influence of disinfection campaigns on the epidemiological transition, however, is still to be discussed. With the systematic investigations on disinfection carried out by Robert Koch, the disinfecting machine was started properly. The social construction of this machinery however, is at least as important as the technological development. So the professionalisation of disinfectors and vermin exterminators is to be examined with regards to the institutional framework. Equipped with modern methods of pest control and with respect to etiological knowledge, vermin extermination became predominant in administrative discourse concerning disinfection since World War I. Later metaphors, thought and practice of Nazism are linked to these concepts of purification and destruction.
Schülerinnen und Schüler sehen historische Quellen in der Regel nur in Form von Abschriften. Stempel, Unterschriften, handschriftliche Notizen und ähnliche optische Merkmale fehlen. Damit gehen nicht nur wichtige zusätzliche Informationen, sondern auch der Reiz des Authentischen verloren. Das vorliegende Heft präsentiert deshalb 28 relevante Quellen zur Frühphase der Weimarer Republik aus den Beständen des Bundesarchivs als hochwertig reproduzierte Faksimiles. Die Quellen sind jeweils mit einem übersichtlichen Kommentar versehen: Hinweise zur Einordnung in den historischen Kontext und zur Überlieferung sowie didaktische Erläuterungen und Vorschläge für Arbeitsaufträge verkürzen die Zeit für die Unterrichtsvorbereitung auf ein Minimum.
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