American Educational Cast Iron Magdeburg Hemisphere, 4-1/2' Diameter x 5-1/2' Height

Cast iron magdeburg hemisphere. Machined from cast iron, this is an excellent replica of the traditional magdeburg hemisphere. One of the hemispheres contains a mounted brass valve for withdrawing and sealing a vacuum. The hemispheres are joined and the air is evacuated with the use of an air pump. Once the air has been removed, your students will find it almost impossible to separate the discs. Reintroduced, the discs separate easily. Instructions provided. Measures 4-1/2' diameter by 5-1/2' height. 4lbs Weight.For better functioning ensure that handles are not be twisted as this may pull the halves apart and prevent vaccum to be sealed.