// 
f 
126 Barrerr, Brown, AnD Haprietp—Researches on a Sertes of Alloys of Iron. 
about 10 per cent. of the total area. (2) White patches in relief are seen in 
certain photo-micrographs of 1167 H. These are probably aluminium which has 
either not dissolved in the iron, or, if it has dissolved in the molten alloy, has 
separated out on cooling. If this is the case, the iron is purer than that in 898 K, 
which appears to retain the whole of the silicon—other than that oxidised to 
silica—in solution. Part of the aluminium has been oxidised to alumina. It is 
curious that the white patches in relief, distributed fairly uniformly through 
1167 H, are absent from 1167 H drawn down. 
“The light etching effects obtained with rods 1167 H turned down and 898 E 
are very noticeably similar. They indicate that minute particles of alumina and 
silica respectively are distributed through the rods. The action of aluminium and 
silicon in these rods may consist (as suggested in Barrett, Brown, and Hadfield’s 
paper) in removing oxygen or decomposing oxide of iron, and thus purifying the 
iron, thereby raising its magnetic permeability. If this is really the case, it must 
be taken into account in considering the cause of the high magnetic permeability 
GH WINGY Jel” 
