Intact working Geissler vacuum tube

 Argon Mercury 

 Tested

Manufactured by 

Tube Light Engineering.

Make sure to check out the photos. 

 The first is the tube with HV applied in a daytime lit room taken with the lights off

The second photo is taken under very bright Led lights 3 feet about the bench, so it will not look as bright. This tube is working great.

This tube was rescued from the Vassar College in NY when I cleared out the physics lab.

Included are data sheet and cardboard tube from same company 

Thanks for looking

Paul

W1VLF