ID: 
2309
Maker's Name: 
Unknown
Dimensions: 
13.5 × 4.3 × 3.6 cm

This is a gas-filled tube. It was used as an electrode in combination with a high-voltage Ruhmkorff coil. The electrode was applied to the skin of the patient, whereupon the the enclosed gas glowed, and the patient was reassured that the electrical stimulation was health-giving.