Hierro y Acerro de Bilbao. (The Bilbao Iron and Steel Mami- 
factnring and Blast Furnace Co. ) 
Case 5 A, — A series of fractures of crucible steel from the 
Dannemora Steel Works of Sheffield, showing the relation of com- 
position hardness and the appearance of the fracture. 
Case 10. — Bars of mild open-hearth steel tied cold into knots 
as a test of quality. A collection of all grades of scrap-iron 
and metal. It contains samples of different grades of iron and 
metal as it is sorted on leaving the scrap-iron dealer’s yard. 
No. 6 , — ^Wires for various purposes. On the wall are speci- 
mens showing the process of drawing wire. 
Nos. 7, 8 and 9. — Models of three types of hot blast stove 
used for heating the air delivered to the blast furnace. 
No. 11. — Model of a rolling mill for rolling structural iron and 
steel. This mill rolls the largest beams of any in Germany. 
No. 12. — Model of machinery and annealing furnaces used 
in preparing molds for cast iron pipe. 
No. 13, — Model of a rolling mill. The three models, Nos. 
i6, 17 and 18 show portions of the iron works of Gebrlider Stumm, 
Germany. 
Upon the walls there is a series of charts illustrating most 
of the furnaces used in the manufacture of iron. 
HALL 77. 
CLAYS AND SANDS. 
Kaolin or Clay is the basis of most of the specimens shown in 
this room. 
Case 1.— Composition of Clays. A collection designed to 
show what are the usual components of clays and what effect the 
ordinary impurities have upon the usefulness of the substance. 
Meerschaum. This is not a clay but is included here on ac- 
count of its use for pipes. 
Application of blast furnance slag to the manufacture of fine 
pottery. 
Case 2. — Fire Clays, with specimens of objects made from 
them and designed to withstand intense heat. 
