Magdeburg Hemisphere Definition
noun
Either of a pair of large copper hemispheres, with mating rims, that were used to demonstrate the power of atmospheric pressure . When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart even by teams of horses.
Wiktionary
Origin of Magdeburg Hemisphere
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They were designed by Otto von Guericke, a German scientist and mayor of Magdeburg , in 1656.
From Wiktionary
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