The Otto von Guericke reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Otto von Guericke

Otto von Guericke (originally spelled Gericke) (November 20, 1602 - May 11, 1686) was the mayor of Magdeburg from 1646 to 1676.

During this time he investigated vacuum and air pressure, invented the vacuum pump, and made the Magdeburg hemispheres, which he demonstrated again in Berlin in 1663 with even more (24) horses.

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