Bell in a Jar - how to get better results without spending a fortune

Peter Sigsworth

If you have a standard bell in jar kit like the SciChem one here

It doesn't work as well as it should because the rubber brackets the bell sits on transfer the vibrations through the base plate.
Ditch the brackets, glue a small piece of wooden dowel in the top, screw in a hook (drill a small hole in dowel to stop air above it pushing it out during evacuation)
Hang your bell from the hook with an elastic band.
new attachment bell hanging from elastic band.jpg
An even better improvement is to ditch the bell and hang a personal attack alarm from the hook which is much louder and gives a clearer result.
And how about showing the students this


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