Bell for demonstrating electro-magnetic operation of apparatus and verifying that sound waves sound waves do not propagate in a fine vacuum (< 1 hPa).
Open acrylic housing with 4-mm safety sockets.

Power supply: 6 V AC
Dimensions: 100x95x50 mm³

Vacuum Bell Jar (U21851) and Vacuum Experiment Plate (U21850) sold separately.