194 THE METALLURGICAL MICROSCOPE 



Such magnetic investigations can be carried- out successfully 

 only by means of a perfectly reliable permeameter and only by 

 determination of all the magnetic characteristics of the material 

 under investigation. Permeameter equipment has been recently 

 developed to a high stage of perfection, combining simplicity of 

 operation with perfect accuracy of measurements (Fahy Simplex 

 Permeameter), and since then the application of magnetic analysis 

 to metallographic investigations has made rapid progress in the 

 L^nited States, It is to be hoped that British metallurgists will 

 apply this excellent method to the solution of their problems, and 

 will co-operate with American research workers, to considerable 

 mutual benefit. 



