112 
PKOCEEDJNGS OF THE SOCIETY. 
ANNOTATED LIST OF 
THE METALLURGICAL SPECIMENS 
PRESENTED TO THE ROYAL MICROSCOPICAL SOCIETY 
BY THE CITY OF BIRMINGHAM, 1921. 
31. Cast Beass. — Mag. : x 200. 
Dendritic structure. 
Ref. : “ Metallography ” (Desch), p 387 et seq. 
32. Stamped Beass. — Mag. : x 200. 
Structure showing the effect of work. 
Ref : As in No. 31. 
33. Cast Ieon. — Mag. : x 100. 
Compare with specimens No. 3 (Hadfield) and No. 24 (Stead). 
Ref. : “ Metallography ” (Sauveur), chaps, xxii. and xxiii. 
34. Case-haedened Steel. — Mag. : x 50. 
Note the infusion of carbon round the periphery. 
Refs. : “ Metallography ” (Sauveur), chap. xix. 
“ The Cementation of Iron and Steel ” (Giolitti). 
35. Hypo-eutectoid Rolled Steel Plate. — Mag. : x 200. C = 
'42 p.c. 
This specimen shows particularly well the elongation of structure in 
the direction of rolling. 
Ref. : “Metallography” (Sauveur), figs. 215 and 216. 
36. Mild Steel Boilee Plate. — Mag.: 200. C = '15 p.c. 
The structure is similar to No. 35, except for the greater proportion 
of free ferrite, due to lower carbon content. 
Ref. : As in No. 35. 
F. I. G. R. 
