a 
ee ON THE ACTION OF AIR AND WATER UPON IRON. 297 
Be. 
. 
Standard Bar of Wrought Iron. 
7. 8. 9. 10. 11. 12. 13. 
pr | | | es | a | a | 
Weight of | Total loss Loss of Won “A 
ae. z Weight of | Specimen y. eight 
_ Dimensions of Seinen after oss Weight a referred to 
| Specimen. in Grains. | 381 days’ squareinch| Standard | ’ 
exposure, | 381 ps of Surface.| Bar 
Character of 
Corrosion. 
Weight of 
Water 
absorbed 
1 i i in. in. 
1375 X3X°875| 24484 | 24496 58 | 1-287 | -124 | 0+ | Uniftstriated. 
Skin removed by planing. 
P| 
b 5 x *875 | 34088 | 33922 | 166 | 2°55 | +245 | 0° | Uniform. | 
i 
& 
& 
pi 
pL 
pr otected by Paints or Varnishes. 
43064 | 43015 49 0:70 067 0: x 
42162 | 42139 23 0:33 “031 0- 
42107 | 42052 55 0:78 075 0: BE 
44277 | 44260 7 0°24 023 0: 3 
42015 | 41989 26 0:37 035 0: Sn 
: R a 
No. 5. Class No. 8. 
| te : Order of 
| _ Condition of Surface of Specimen after 381 days’ exposure. Protective 
9 Power. 
13 2 a a aE ELSE ae Of eer at 
| Rust in spots. Minute cavities 7 
| Uniform coat of soft rust ........+. 8 
| Skin sound. Blue rust in spots........ seeps Coapabeecescosodce 4 
i} sound. Rusty in spots ......... Sappslsdasensecsevacqucanyas 3 
| munbroken. Uniform rust ....... pean eeieeinekt cahiedals ansists 10 
kin unbroken. Uniform rust ......... costa pAseeros nereeee ee 9 
| Skin sound. Rusty in spots .......scseccsssccscovscceseoecenees 2 
|S carcely any Visible rust .......csscssecsscceccsscescessensee eons e 1 
Hard coat of skin. Buff rust.... ... 5 
Hard coat of skin, Buff rust ......ccceccscssssssesseseeseevens 6 
e 
i 
