The Royal Institute explains.
KrazyKat42says...

I made one of these in 8th grade for the science fair. I got top grade. The judges said they had heard of these, but had never seen one work.

iauisays...

Neat! I remember seeing one of these at a science fair when I was a wee tyke. If he'd put the radioactive metal in line with the plane of the alcohol vapour we'd have seen a full-length supernova of particles in the bubble chamber.

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