the High-Tension Magneto. 377 



mnch less than fi. Points corresponding to yu/ are denoted 

 by +, and against each is marked the value of c for the 

 combination to which it refers. It will be seen that the 

 difference between /jl and // decreases with the coupling, 

 and at the smallest coupling investigated the two are nearly 

 equal. These relations, again, are suggestive for a theory 

 which would take into account the effect of the losses in the 

 iron cores. 



Fiar. 8. 



O 2 4 G 



T(orT')xlO*sez. 



As is to be expected, the damping coefficients are smaller 

 for the inductor machine than for the Thomson-Bennett 

 armature in its housing, although they are greater than 

 those for the latter out of its housing. It cannot be imme- 

 diately concluded that the difference is due to the better 

 lamination of the magnetic circuit of the inductor machine, 

 for if any part of the loss is due to hysteresis it will decrease 

 rapidly with the flux density in the iron. This flux density 

 is doubtless greatest in the Thomson-Bennett armature in 

 its housing, and probably least in that armature out of its 

 housing. The superiority of the inductor machine in this 

 respect is of considerable practical importance, whatever 



