18UL] 



The Passive State of Iron and Steel. 

 Table VIII. 



485 



were cut from one larger wronght-iron plate and were thus practically 

 of uniform composition, thus ensuring an accurate comparison of the 

 relative passivity of the wrought iron compared with the different 

 types of steels, and at the same time indicating relatively the 

 influence of varied composition and structure on the passivity of the 

 different classes of steel under observation. In each experiment, a 

 polished wrought-iron plate and a polished steel plate were firmly 

 placed in two small holes drilled through a thick plate-glass cover ; 



VOL. XLTX. 2 K 



