Description:
A glass bulb with four open side tubes. The two widest and shortest ones face each other and have cork stoppers with electrodes attached to them. They both can slide in and out of the bulb. One other side tube, on top, is narrower and longer and make a right angle turn. The thicker one can hold the tube attached to a special stand that has a hole for the end of the tube to pass through. The electrodes have ends shaped like spheres and face each other at a close distance forming a spark gap.