It is one of the most effective exhibits we have ever built, and even if you know what is going to happen it is somehow still surprising whether you are a 2 year old, or a physics grad.

Mass Spectrometer Model

To demonstrate approximately how a mass spectrometer works for an outreach project at the Museum of Science and Industry in ManchesterĀ  I built a ball bearing deflector. It works by having a ramp, that you roll ball bearings down, and at the bottom they go past a magnet. The small ball bearings are deflected more than the large ones, a bit like the ions in a real mass spectrometer. Apparently it went down well.