Externally fed combustion chamber of a fire box supporting structure for a boiler. Top: Boiler support structure with combustion chamber. Bottom: Fire box door embossed with Walsh & Weidner Boiler Co. Chattanooga Tenn USA. This company, formed in 1889 to produce pressure vessels and both fire and water tube boilers, was subsequently consolidated as Hedges, Walsh, Weidner Co. in 1928.