MAGNETIC ALLOYS OF IRON, NICKEL, AND COBALT 465 



was first used, for commercial purposes on a large scale. The other 

 alloys are still in the commercial development stage, but interesting 

 results have been obtained which make us feel confident that both the 

 perminvars and the iron-cobalt alloys will take their places beside 

 permalloy as important magnetic materials in electrical communi- 

 cation. 



