A simple Cherenkov detector for educational purposes

Cherenkov detectors are in use today in small experiments as well as modern ones as those at the LHC. This short note is about the construction of a small Cherenkov detector with limited resources, which could be used to observe the cosmic rays. The Cherenkov light obtained in this particular detector is read with a photo multiplier tube and its signal is observed on an oscilloscope. The detector construction can be achieved by relatively simple means and can be used as an educational tool.