XEE4146922 Otto von Guericke\'s Magdeburg hemispheres experiment, which demonstrated atmospheric pressure - Experience by Otto von Guericke (Otto de Guericke, 1602-1686) with Magdeburg hemispheres on atmospheric air pressure (vacuum made in hemispheres that 16 horses fail to detach each other) Engraving in ??????Sciences mises ? la la la scope of all - popular physics and chemistry??????by Alexis Clerc - End 19th century - Private collection by French School, (19th century); Private Collection; (add.info.: Otto von Guericke\'s Magdeburg hemispheres experiment, which demonstrated atmospheric pressure - Experience by Otto von Guericke (Otto de Guericke, 1602-1686) with Magdeburg hemispheres on atmospheric air pressure (vacuum made in hemispheres that 16 horses fail to detach each other) Engraving in ??????Sciences mises ? la la la scope of all - popular physics and chemistry??????by Alexis Clerc - End 19th century - Private collection); Stefano Bianchetti; French, out of copyright.