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Magdeburg hemisphere

noun, Physics.
1.
one of a pair of hemispherical cups from which air can be evacuated when they are placed together: used to demonstrate the force of air pressure.
Origin
after Magdeburg, where German statesman and physicist Otto von Guericke (1602-86) constructed a pair of such hemispheres
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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