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For a century and a half medicine depended increasingly on graphic registration methods and clinical images. Technical developments were not the only condition for that. In the middle of the 19th century the scientists got another perspective of their research-object - the organism. This concept of an experimental and more physical medicine led to the idea, that the graphic curve registrated by an appartus was identical with the inner organic processes. Consequently, connected with this principle of visualization, the diagnostic and the therapeutic strategies were influenced, and also the comprehension of illness.