No. I. 
ON THE ACTION OF AIR AND WATER UPON IRON, 
275 
a Iron, immersed in clear Sea Water, Kingstown Harbour. 
and one half fathoms water, at half tide, ona clean sandy bottom. Tide rises 
The length of the Box lies east and west. 
. 
q Ww elsh Cast Iron. 
the period of immersion = 387 days. 
in Kingstown Harbour = 1027:80. 
Sunk at one o'clock p.m., 
Sunk a second time January 11th, 
6. fe 8. 9. 10. 11. 12. 13. 
Weight of | Total loss | Loss of Loss of | 6 og 
Dimensions | Weight of | Specimen by _|Weightper| Weight | #39 Character 
of Specimen after Corrosion |square inch) referred to| "sos" of 
Specimen. | in Grains, | 387 days’ in of Standard | 832 Corrosion. 
exposure, | 387 days, |. Surface. Bar. 3” 3 
Sejin, in. in. 
mex 5s xl 43011 42720 291 4:16 392 0- Uniform P. 
5x5 x °25| 11871 11384 487 8°85 834 0: Uniform. 
5x5xl 43777 43452 325 4°64 ‘437 0- Local pitted. 
5 x 5 x 25} 12665 12209 456 8:29 782 0: | Local. 
5x4xl 34843 34469 374 6°45 608 0- Uniform. 
5x5x1 43558 43200 358 5-11 482 0: Uniform P. 
5x5 x :25| 12185 11759 426 7:74 730 0 Uniform. 
5x5x1 41257 | 41176 81 1:16 109 0: | Tubercular. 
5x5 x *25| 10846 10576 270 4-90 A462 0- Tubercular. 
5x5x1 41864 41547 317 4:53 ‘A27 0- Uniform P. 
5x5 x :25| 11665 11169 496 9-01 *850 0: Uniform P. 
5x5x1 43785 43638 147 2:10 198 0- | Local. 
5x5 x -25| 12929 12839 590 10-70 1-009 7:0 | Local pitted. 
J 
Irish Cast Iron. 
x 5 x -25| 10922 10479 443 8°05 759 0- Uniform P. 
x5x1 40670 4033] 339 4:84 457 0: Uniform P. 
x 5 x 25! 11886 11453 433 7:87 F742 0- Uniform P. 
x5 xl 42915 42695 220 3:14 “296 0- Uniform P. 
Shropshire, and Gloucestershire Irons. Cast. 
19X5 ~x-25| 12197 11789 408 7:40 698 0: Tubercular. 
15x5 x1 | 44690 44352 338 4:83 *456 0: Tubercular. 
5x4 x1 | 34814 34412 402 6-93 654 0: Local. 
moexe <1 | 34112 33770 342 5°76 543 0: Local. 
5x3°63x 1 | 31818 31530 288 5°37 507 0- Local. 
‘\5x5 = x:25| 12454 11900 554 10-07 941 3° Local. 
5x3-75x 1 | 32736 32527 209 3°62 341 0- Local. 
[8x35 x1 29617 28773 844 16°23 1:531 0- Local. 
re Pz 
