Geissler tube
= Geissler tube
{wiki=Geissler_tube}
A Geissler tube is a type of glass discharge tube that is used to demonstrate the properties of gases and the effects of electrical current passing through low-pressure gases. Invented by Heinrich Geissler in the mid-19th century, these tubes contain a gas at low pressure and are sealed to allow the observation of various phenomena when high voltage is applied across electrodes at either end of the tube.