Heavy Anode Gas Discharge Tube

Ref. B18

This is a 23” (57 cm) long with a 7” (18 cm) bulb and of unknown make. The etching on the anti-cathode around the target reads “Patented Sept.5 1911” and, on the lower side of the anti-cathode, a serial number “325”. 

The centre of the tungsten target shows moderate erosion.

The regeneration device in the auxiliary chamber consists of a small glass tube stuffed with what looks like two types of material: the base of the tube (to the right in the picture below) contains some black material, probably of carboniferous nature, while the rest of the tube is stuffed with a whitish fibrous-looking content, very likely asbestos.