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Bell in Vacuum
Product Number: SB44677
In Stock (Ships within 1-2 business days)
Nature, of course, abhors a vacuum - and sound waves won’t travel through one. Prove it with a ringing bell inside a sealed glass jar. As air is gradually pumped out of the jar, the bell becomes faint, then dies. Includes jar, vacuum plate with valve, rubber seal, bell system, and instructions. You need a vacuum pump and two
AA batteries (not included). Bell may be removed for other vacuum experiments. The inside height is 8 in., and the diameter is 8 in. Includes bell jar, electric bell, base plate with seal, and instructions.
After spending $140 on this, we were never able to get it to work. We bought the hand pump that is also sold to go with this. I'm not sure if the hand pump is too cheaply made to be effective, or if the lid is not making a tight enough seal.: