30 REPORT—1843, 
Second Course of Experiments. } 
Tape I.—Box a. No. 1. containing Specimens of Cast and Wrought Iron 
immersed in clear Sea Water. 
Sunk and moored a second time in Kingstown Harbour at the Second Buoy in from the 
Western Pier Head, in three and a half fathoms water, at half tide, upon a clear sandy 
bottom, on January 11, 1840, at one o’clock r.m. Weighed and removed again at same 
hour on January 12, 1842; hence immersed 732 days. 
Box a. No. 1. Class No.1. Welsh Cast Iron. 
_ 
we 
> 
ir) 
e-) 
=) 
| 
| 
~ 
Character 
of 
Corrosion. ~ 
Dimensions 
of 
Specimen. 
No. of Exp. and 
mark of Spec. 
Weight of Speci- 
men in Grains. 
Weight of Speci- 
men after 732 
days’ immersion, 
Total loss by Cor. 
rosion in 732 days. 
Loss of weight 
per square inch 
of Surface, 
Loss of weight 
referred to 
Standard Bar, 
Increment of 
Corrosion. 
Decrement of 
Corrosion. 
t 

in. in, in, 
5x5 x1 | 42720 | 42327 5614 | 0-633 
5x5x25 | 11384 | 10895 8-890 | 1-003 
5x5x1 | 43452 | 43059 5°614 | 0°633 
5525 | 12209 | 11886 5°872 | 0-662 
5x4x1 | 34469 | 34120 6-017 | 0-678 Uniform. 
5x51 | 43200 | 42807 | 393 | 5-614 | 0-633 Uniform P. 
0 Uniform P. 
0 
0 
0 
0 
0: . 
5x5 x25 | 11759 | 11388 6-745 | 0-761 | 0- . * | Uniform P. 
0 
0 
0 
0 
0 
0 
Uniform P. 
Uniform P. 
Uniform P. 
5x5x1 | 41176 | 40904 3°885 | 0-438 | 0°894)0- * | Local. 
5x5 x25 | 10576 | 10413 2963 | 0334 ; 
5x5x1 | 41547 | 41090 6528 | 0°736 
5x5 x25 | 11169 | 10887 5°127 | 0°578 
5x5x1 | 48638 | 43311 4671 | 0527 
5 x> X25 | 12839 | 10949 7-090 | 0:899 
COONS Or Cobo 
RReEReRRKRER 
i Local pitted. 
? , - | Uniform P. 
* | Uniform P. 
K * | Uniform. 
: : ‘0| Local pitted, deep. 





Box a. No.1. Class No. 2. Irish Cast Iron. 
a@ 14\5x5 x25 | 10479 | 10074 | 405 | 7-363 | 0-830 | 0- |4-158 0: | Local Plumbago. 
@15|/5x5x1 | 40331 | 39687 | 644 | 9-200 | 1-038 | 0-023 0- 0: | Local Plumbago. 
#16|5x5 x25 | 11453 | 11056 | 417 | 7-581 | 0°855}0- |8°862| O- | Uniform Plumb. 
217)5x5xX1 | 42695 | 42266 | 429 | 6-128 0-691} 0° (0-099) O- | Uniform Plumb. 
Box a. No. 1. Class No. 3. Staffordshire, Shropshire and Gloucestershire 
Cast Irons. 
3°536 * | Local Plumb. 
1:870 * | Local Plumb. 
4:070| 0: | Local pitted. 
2-935 | 0: | Local pitted. 
2-281 | 0: | Local pitted. 
6:927 | 2-0) Local Plumb. 
1:670| O° | Uniform. 
11-299} 0 | Local Plumb. 
| 
218|5x5 x25) 11789 | 11387 | 402 | 7-309 | 0-824 
#@19/5x5 X11 | 44352 | 43960 | 392 | 5-600 | 0-631 
@20\5x4 x1 | 34412) 34141] 271 | 4-672 | 0:527 
@21|5x4 x1 | 33770 | 33460 | 310 | 5-345 | 0-603 
a 22'5x363X1 | 31530 | 31217 | 313 | 5°843 | 0-659 
@23}5x5 25) 11900] 11573 | 327 | 5-945 | 0-670 
«a 24/5X3-75xX1 | 32527 | 32324 | 203 | 3-690 | 0-416 
@25|5xX3:5 x1 | 28778 | 28288 | 485 | 9-327 | 0-052 
SSS2CSSS 






