Usually historians work in archives with historical documents trying to reconstruct theories or the social and cultural context of physics. But not everything about physics' history is written in the documents. Therefore, we try to access new levels of knowledge by analyzing 3d-objects and documents. Including the material aspects of science in the historical narrative can greatly enrich our knowledge about the way science works. We will introduce you to some standard approaches, such as the Winterthur model, to analyzing unknown objects. This model may be extended by considering the biography of the object, which changes in meaning over its lifetime. The seminar consists of a theoretical part and a hands-on part, in which the students analyze real historical instruments from the Friedrich Schiller University’s collections. The course will be held in three blocks: First block: presentation of theoretical approaches, second: hands on, third presentation of the results from the hands on session. To acquire ECTS an essay is required. The seminar is part of the module GdP (Geschichte der Physik) of the Master in History of Science.