ON THE ACTION OF AIR AND WATER UPON IRON. 37 
Box £. No. 2, First immersion. 
Wrought Iron and Steel. 
Character of Corrosion, 
of Surface, 
Standard Bar. 
ight of Water 
absorbed, 
|e 
Loss of Weight 
referred to 
per square inch 
Loss of Weight 
Fibre straight, developed all over, most at the ends 
Fibre straight, developed all over, most at the ends ........ edepesiaced 
Fibre straight, developed all over, most at the ends 
Fibre straight, developed uniformly all over...... Pouetvstbncsansse wieGee 
Fibre tangled, corrosion local and pitted 
Sides smooth, slightly pitted, edges and ends lamellar 
Fibre straight, developed all over, but unequally.......... ss ate paite due 
Fibre finely developed, corrosion nearly uniform at ends and sides . 
Fibre straight, corrosion nearly uniform, most at ends .....s0.... hey: 
Fibre tangled, corrosion principally at the edges, local and pitted... 
Fibre badly developed, corrosion chiefly at the edges, local and pitted.|Cold 
Fibre straight, deeply and beautifully developed........ CHAU Pts Cold 
Lamellar on the edges, sides smooth, corrosion local and in pits ...|Cold 
Fibre developed at the ends, sides and edges smooth, corrosion local, 
Fibre developed at edges and ends, very deep at one end, corro- 
sion local 
Fibre straight, strongly developed, corrosion local and pitted 
Fibre developed uniformly all Over ..........ssecsccnececceseeecesconeeee --|Cold 
Fibre developed at ends only, corrosion uniform at sides and edges. 
Corrosion nearly uniform, metal locally removed in mammillary 
Pits, fibre or spicula at ends 
Corrosion uniform, crystalline structure developed (crystals cross- 
ing at angles of 60° and 120°), silvery plumbago i 
Fibre uniformly developed, edges lamellar 
Fibre uniformly developed, edges lamellar, corrosion slightly local... 
* | Corrosion almost uniform, no fibre developed 
0: Fibre straight, imperfectly developed, corrosion local in mammil- 
Lary pitas nevec CHM sites vspuevvaes Wetted, atITit atenteten ahd 

18:29 
26:68 
15-76 
14:79 
28°28 
24°05 
31°82 
16°65 
| 26-46 
| 14:67 
| 14:76 
| 19°68 
| 16-84 
” 
Cold 
ax 
SOP PS F FSS S SESSSSSOSSSOSCSS 

Cast and Wrought Iron. First immersion. 

1 855 1965 |0-0 Fibre visible at ends, sides smooth, zinking, black, brittle and easily 
detached. 
3-04 13-44 19-0 Paint still discernible, as a coat of mixed oxides of zine and iron, yi 
pitted in some spots : & 

