Geissler Discharge Tubes, Set of 6 with Stand

Description

This set of 6 premium Geissler tubes is designed to demonstrate the differing discharge characteristics of a gas discharge tube under varying degrees of vacuum. These large Geissler tubes measure approximately 16" / 40cm in length and 1" / 2.5cm in diameter. The cathode is disc shaped and the anode is pointed. All tubes are clearly identified with degree of vacuum in mm Hg and include the following:
40mm Hg
Violet streamers appear between electrodes
10mm Hg
A pink glow fills the tube, concentrated around the anode
3mm Hg
Discharge becomes faint blue, Faraday's dark space appears
1mm Hg
Faraday's dark space expands
0.10mm Hg
Cathode begins to fluoresce
0.02mm Hg
Cathode rays emerge, causing the tube sides to fluoresce
Both electrodes on these premium tubes have a full glass envelope. A plastic stand, insulated electrode and connecting wire with clip are included (as shown in product photo). A 50mm induction coil is the recommended power supply.