The Magdeburg hemispheres demo was part of a series of experiments he did for Emperor Ferdinand III of the Holy Roman Empire. Otto von Guericke , Encyclopaedia Britannica, last updated 7 May 2019 The ...

May 8, 1654.—One of the most striking demonstrations in physical science made during the seventeenth century was that of Otto von Guericke, who on May 8, 1654, before the assembled princes at ...