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Keywords from Image Description:
Magdeburg hemispheres drawing from Fotothek . de Experiment zur Demonstration des Luftdrucks Magdeburger Halbkugeln en Experiment to demonstrate the effect of atmospheric air pressure the Magdeburg halfspheres modified Fotothek df tg Physik Vakuumtechnik Luftdruck Otto von Guericke retouched Cropped turned to grayscale cleaned