Stock Photo - History Under Pressure -- (Fourth Of Six) Otto Von Guericke himself works his air pump to evacuate The air from the Iron Sphere just before the horses try to pull the hemispheres apart. Two teams of eight horses each failed to overcome the outside Air Pressure on the vacuum sphere. This re-enactment for filming took place on a field near Libertyville, Illinois. April 08, 1955. (Photo by United Press).

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