: ne ampetion of the Poddle River therewith. 
. 
_ Specimen. 
$ 
' 
re 
\ 
‘ 
oa 
5x5x1 
o3x5x1 
Scotch Cast Iron. 
7. 8. 9. 
Weight of | Total loss 
Weight of Spagimnen by 
Specimen after Corrosion 
in Grains. | 383 days’ in 
exposure. | 383 days. 
41449 | 41145 304 
43295 | 42885 410 
{ staffordshire Cast Iron. 
Trish Cast Iron. 
42462 | 42181 281 
43333 | 42903 430 
44976 | 44857 119 
43760 | 43478 282 
40741 | 40305 436 
42675 | 42241 434 
44799 | 44473 326 
42454 | 42147 307 
42318 | 41981 337 
U2 
f 
ON THE ACTION OF AIR AND WATER UPON IRON. 297 
Depth of water four feet at ebb, 
10, 
Loss of 
square 
inch of 
Surface. 
4:34 
5°85 
4:01 
6:14 
1:70 
4:03 
6°23 
6-20 
4:65 
4:38 
4:81 
11. 
Loss of 
Weight per| Weight 
referred to 
Standard 
Bar. 
‘A417 
562 
378 
590 
163 
373 
599 
598 
‘447 
“421 
462 
absorbed. 
2? 
2? 
very brackish at flood. Bottom soft putrid mud. Temperature of water 
lock p.m. Weighed and landed again on the 24th of August, 1839, at same 
o’clock p.m., January 13th, 1840, and now immersed. Specific gravity of 
13. 
Character of 
Corrosion. 
Local P. 
Tubercular. 
Local P. 
Tubercular. 
Tubercular. 
Tubercular. 
Local P. 
Tubercular. 
Tubercular. 
Tubercular. 
Tubercular. 
