Share 'Can anyone fix a 1960 French boilers lamp?'

Does anyone know what type of lamp this is or how I could get it working again.  I think it is French and form the 60/70s.  I bought it c 1990.  I took it out after 10 years just now and liquid bubbled around for 20 minutes when the light was on but then stopped. Does anyone know how I could replace the liquid? Many thanks