ON THE ACTION OF AIR AND WATER UPON IRON. 285 
id Bar Wrought Iron. 
SS S| SS ee eee ee ae 
Weight of| Totalloss| Loss of Loss of 
Weight of| Specimen by Weight Weight 
Specimen | after 387 | Corrosion | per square| referred to ‘ 
in Grains.| days’ in inch of Standard 
exposure. | 387 days. | Surface. Bar. 
Dimensions of 
Character of 
_ Specimen. 
Corrosion. 
Weight of 
Water 
absorbed 
75 x 3 x -875| 23977| 23436 | 541 12:57 | 1186 |. 0+ |Uniform str. 
ay Cast Iron. Skin removed by planing. 
5x5x -75 | 34131 ssi | 981 | 18°55 | 1-278 0: | Uniform. | 
y Cast Iron, protected by Paints or Varnishes. 
“5x5x1 | 43050! 42071! 979 | 1398 | 1819 | o- 5 
—5x5x1 42940 | 42295 | 645 7:22 ‘681 | 0 ss 
| 5x5x1 41668 | 41257 | 411 5:87 554 | 0 as 
~5x5x1 41568 | 41288 | 280 400 | 377 | 0 3 
—5x5x1 42480 | 42166 | 314 4-48 | -623 | 0- i 
B. No.2. Class No. 8. 
Order of 
Condition of Surface of Specimen after 387 days’ exposure, Protective 
Power. 
a 
mm Com DS OVO ST 0 SO 
sound, hard rust 
sound, hard rust 
