The experiment of Magdeburg

Dear Friends
in our excursion to Magdeburg, Jean-Luc and me were particularly attracted by the living reevocation of the historical experiment of Otto von Guerike of 1656 named also experiment of the hemispheres of Magdeburg
http://en.wikipedia.org/wiki/Magdeburg_hemispheres . With this experiment it was possible, for the first time, to create the vacuum and demonstrate the pressure of our atmosphere. In the reevocation, up to six pairs of horses at each side were unable to separate the joined hemispheres. Only at the end by restoring the normal pressure inside, the hemispheres disjoined themselves. The images give you an impression of the exciting atmosphere of the reevocaton.
Salutations
Giancarlo