4. MODELS, APPARATUS, AND SPECIMENS TO ILLUS- 

 TRATE THE PRODUCTION OF IRON, STEEL, AND 

 OTHER METALS. 



The following are shown in the Machinery and Inven- 

 tions' Section of the Science Collections, and are fully 

 described in the catalogue of that division. 



Model of early blast furnace and blowing engine. 



Model of Ayresome Iron Works, 1890. 



Specimens of pig iron, &c. 



Model of Whitwell's hot-blast stove. 



Root's blower, by Thwaites. 



Sectional model of Root's blower, by Samuelson. 



Sectional model of Baker's blower. 



Sectional model of Stewart's foundry cupola and receiver. 



Specimens of malleable iron castings. 



Fletcher's crucible furnace. 



Morgan s graphite and salamander crucibles. 



Model of a reverberatory puddling furnace. 



Model of Thornycroft's rotary squeezer for puddled balls. 



Model of Sheffield steel plant for producing and working 



crucible steel. 



Specimens of Swedish iron and steel. 

 Siemens' open -hearth steel melting furnace. 

 Model of plant of Bessemer Steel Works, 1860. 

 Sectional model of converter, used in the Bessemer process. 

 Tuyere for converter. 

 Specimens of Bessemer steel. 

 Model of Bessemer Steel Works, 1890. 

 Diagrams of plant for compressing fluid steel. 

 Hadfi eld's manganese-steel castings. 

 Drawing of Swedish gas- welding furnace. 

 Siemens' electric pyrometer. 



Cupellation furnace for separating silver from lead. 

 Drawing illustrating the separation of silver and lead by the 



Pattinson process. 



Model of plant for the Pattinson process. 

 Ladle for the Pattinson process. 

 Ingot moulds for lead. 

 Lead fume condenser. 

 Model of Cornish tin smelting furnace. 



