Can anyone tell me exactly what this is ?

[soddingtinkerbell]

This piece of equipment (gas welding furnace ??) is extremely old. Embossed on it is the following info: isKasenit Ltd London SE1.
Manufacturers of hardening compounds and heat treatment furnaces
It shows Type No. B11
Order No. Z1353
Air pressure 67
Gas Pressure 3
Many thanks !View attachment 139751

 

[the snooper]

Brazing hearth

 

[soddingtinkerbell]

Brazing hearth

Thank you ! Are they still used in this style ?