ON THE ACTION OF AIR AND WATER UPON IRON. 295 
1, immersed in the clear Fresh Water of the river Liffey. 
in the premises of the Royal Military Hospital, Kilmainham, in a running 
variable, from 32° Fahr. to 68° Fahr. Bottom of fine granite sand. Sunk 
nded on the 20th of August, 1839, at same hour. Hence immersed for 381 
mersed. Specific gravity of water = 1001-39. 
co tch Cast Iron. 
6. 7. | 8. 9. 10. 11. 12, 13. 
e_e_—X————— |S ———————— | EE Es 
be: a Weight of ~ 1088 | ross of = = S 3 
; a eens of ei ilo ater. Corrosion bye ay referred ta aa8 eee of 
in Grains, | 381 days’ in a Surf ch) Standard | ‘3 3 ‘orrosion. 
exposure. | 381 days, |Q}Surtace.| Bay. Ss" 3 
- in, 
xl 42994 | 42940 54 0-77 074 0: | Uniform. 
xl 43579 | 43493 86 1:22 “116 0: | Tubercular. 
Velsh Cast Iron. 
5x5xl1 42562 | 42485 7 1:10 +104 0: Uniform. 
x5~x1 43025 | 42923 102 1:45 139 4:0 | Tubercular. 
‘Staffordshire Cast Iron. 
= 
43534 | 43457 77 1:10 "104 0: | Tubercular. | 
44174 | 44095 79 1:13 “109 0: | Tubercular. 
Cast Iron. 
5 xX 5x1 43099 | 43024 75 1:07 103 0: | Uniform. 
IxX5x1 43963 | 438835 128 1:82 175 0: | Tubercular. 
’ 
' 
' 44204 | 44195 79-1 14:13 1 199° | o-'*] Pubercular. 
' 43638 | 4358) 57 | 081 | -o78 | 0: | Tubercular. 
| 
43060 42975 85 1:21 ‘116 0: Tubercular. 
fees 
