Check the listing for details. ANTIQUE TECHNICAL INSTRUMENT DEVICE MAGDEBURG HEMISPHERES DEMOSTRATION VACUUM. Condition: Used. Listed at 249.00 USD. A pair of large hemispheres, with mating rims. They 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 by teams of horses.
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