1885.] Metals during Diffusion of Salt and Fresh Water. 373 



bright polished plates, of similar manufacture and general composition 

 to the metals employed in the former paper. 



Table A. — Analysis of the Wrought Iron, Steels, and Cast Metals 



employed. 



















DO 





d 



o 





Description. 



Graphitic 

 carbon. 



Combined 

 carbon. 





Silicon. 



Sulphur. 





| Phosphor 





Manganes 



Iron (by 

 difforcn< 



Total. 









none 







•392 



0-034 







•270 







•194 



99-110 



100-000 







0-150 







•015 



0-111 







•064 







•540 



99-120 



100-000 



"Soft" Siemens-Martin steel 







0-170 







•071 



0-117 







•077 







•627 



98 -938 



100-000 









0-460 







•074 



-025 







•210 







•184 



99 -047 



100-000 









0-510 







•068 



0-113 







•087 



1 



•153 



98 -069 



100 000 





2-780 



0-390 





•340 



0-090 







•580 



e 



•450 



93-370 



100 -ooo 



Common cast metal, No. 2 



2-620 



0-670 





•940 



0-090 







•950 







•520 



93 -210 



100-000 



The exposed part of each plate was 3 inches square by J inch thick. 

 There was, however, a shank (3 inches long by J inch square) left in 

 the centre of each plate for connecting purposes. The method of 

 experimentation was as follows, see sketch, fig. 1 : various interesting 

 results were obtained by this arrangement of the cells. 



Fig, 1. 



Sketch of one set of the Diffusion Cells. 



Four plates, A, B, C, and D (cut from one large plate of each 

 of the metals, so that the four experimental plates of each set 

 were practically of the same composition, molecular structure, &c), 

 were arranged as shown in fig. 1, each plate having been previously 

 dried at 212° F., and weighed on the balance. 



