Cornell University
Cornell University: How to Build a Cloud Chamber
A very interesting site by university physicist Andrew Foland on how to build a cloud chamber. Includes all the how-to-build information and a materials list as well as a discussion of how to use the cloud chamber and what you should see.
Nobel Media AB
The Nobel Prize: Observing the World of Particles
After some brief background information on detectors, this site breaks into information on the cloud chamber, the nuclear emulsion, the bubble chamber, and the multiwire chamber.