L20 TKOGEEDINGS OF THK SOCIP^TV. 



25. Segregatiox of Manoanehe' Sulphide (MnS) from Blast 

 Furnace Bear. — Heat-tinted. Man. '• x ^''<*- Constituents : 

 White = iron. <^rey = MnS. Dark = graphite. 



Ref. : " Proceedings of the f 'leveland Inst, of Engineers " (Stead), 

 li)13-l!)14, p. 169. 



2(), 27, 28, 29. Electrically Treated Steels. — May. : x loo. 



C = 25 p.c. o-fi8 p.c, 0-S2 p.c, 1-32 p.c, respectively, showing 

 strong line of demarcation of structure. 



Ref. : " Value of Science in the Smithy and Forge " (Cathcart), 

 chap. vii. 



30. Inoot Steel. — C = o-3 p.c, P = 0-3 p.c. 3Iag. : x loo. 



After forging from C in. ingot to 2 in. bar. The effect of mechanical 

 work on the structure is illustrated consecutively by this specimen, which 

 consists of four pieces. 



Ref. : " Metallography " (Sauveur), chap. xiv. 



