n?OX UXDKK PEKIODIC MA(;XET!ZIN(; FOKCES. 



105 



As the induction B, approaches zero both /x„ and seem to tend 

 to definite small values (vhieh are independent of the frequency, while 

 as B, gets verv large jx^ again seems to tend to low values that are 

 independent of the frequency. 



We have been unable to find any simple formula by which the 

 relations of either /x„ or B to B^ and T can be expressed. 



9. The characteristics of the upper harmonics of the induction 

 are plotted against B, (from Table III.) in Vig. V. It will be seen 

 that ^3 is not linear in B, as was suggested by one of us in a former 

 paper. The present results were obtained in any one series with 

 practically constant wave form for all inductions, while the former 



