ON THE ACTION OF AIR AND WATER UPON IRON. 293 
7. 8. 9. 10. 11. 12. 13. 
\ Weight of | Total loss Lossof | ‘Sg 
| a 5 Weight of | Specimen y Loss of | Weight | 238 
| Dimensions of | Specimen | after | Corrosion | Weightper| referred | SR | Character of 
Specimen. in Grains. | 383 days’ in eauere inch toStandard] ‘3 2 Corrosion. 
exposure. | 383 days, |0f Surface.) “Bar, 3s 
"5 x 3x -8/5| 24380 | 24062 | 318 | 7-297 | -694 | 0: |Unif, striated. 
Gray Cast Iron. Skin removed by planing. 
Fi 
| 3x3 x 75 | 34114 
| 
0- | Uniform. | 
soar | 440 | 677 | 651 
| 5xX5x1 | 42238 | 42008 230 3:28 “315 
~5x5x1 | 42293 | 42124 169 2-41 231 
~5x5x1 | 41865 | 41582 283 4-04 ‘388 
| 5x5x1 | 42973 | 42790 183 2-61 ‘251 
5 x5x1 | 42150 | 41940 | 210 3-00 -289 
” 
th) 
” 
Bue te 9 ts 
Order of 
Condition of Surface of Specimen after 383 days’ exposure. ia aaa 
roded in pits with plumbago  ..........essessecseseose races -8 
sound, Hard rust im spots ....sssecsessessesseesesceeces 7 
uniform. Coat of hard rust ........ssecececeeceeecscesees 1 
Skin uniform. Coat of hard rust ......sssseeecssesssseessenees 2 
k coat of tubercular rust......... ss. FEC UNCEE REO ET cna? 9 
in spots, with plumbago .........sssscccescesssccesceeeecees 10 
sound. Blue rust in spots .........ccscecsessescscereees 4 
sound. Superficial rust in spots ......sessescsssscsenees 3 
sound. Hard uniform rust .......cccece0 coscecseceences 5 
6 
sound. Hard uniform rust .........ccccccecsssseescesecs 
