Metal Magdeburg Hemispheres, 1 Each

United Scientific® Metal Magdeburg Hemispheres by United Scientific are heavy-duty air pressure demonstration hemispheres with thick cast iron walls, large steel handles, and a plated brass valve. Precision machining helps prevent leakage, and the sphere measures 4 in. in diameter, or 4.25 in. with its sealing flanges. They are closer to the original design than plastic or rubber models and suit physics teachers who repeat the demonstration often.