MAGNET STEELS AND PERMANENT MAGNETS 



385 



ence of a magnet of the sum of these characteristics could be expressed 

 in terms of the values of Br and He for the material. Such an assump- 

 tion, if valid, would simplify the problem considerably. 



It is true that in the literature on the subject there are several 

 papers^''''' describing more or less accurate methods by means of 

 which a designer may predict the flux of a given magnet provided the 

 demagnetization curve for the steel is known. But these methods are 

 laborious, and unless a complete redesign is worked out for each case, 



Fig. 1 — Hysteresis loop of magnet steel. 



they do not answer such questions, for example, as how much a certain 

 change in Br or He will affect the remanence of a given magnet, other 

 factors remaining constant. 



Because the flux value of a magnet is affected by shape as well as 

 other factors, and because magnets are made in a bewildering variety 

 of shapes, it was decided to confine the investigations to straight bar 

 magnets and leave the matter of the effect of shape on flux for a later 

 study. 



^ For references see end of paper. 



