.IX i.i.r.crRic.-u. i-RF.Qrr.xcy ax.m.yzek .ii5 



|)\ ilu' Imdon; .i prim.iry series h.niiin for its fiiiul.iincntal llie 

 driving li"i'(|iK'iu-\-, I'lO CNcles, and a sul)si(liary series, ha\iiin for 

 its fniul.imenlal hall ihe (lri\inn fre(|ueiu-y or '22") cycles. The even 

 harmonic components of the secondary series coincide, of course, 

 with the freciuencies of the primary series. The primary series can 

 be accounted for by the fact that with such large amplitudes the 

 changes in resistance are not a linear function of the amplitude of 



Tt* af* 1014 iin 



:5" 





rwcautucf 



Fig. 11 — Analysis of Organ F'ipe Tones 



motitjn. The subsidiary series is due to the non-symmetrical effect 

 of the inertia of the carbon grains in vibration, the motion being so 

 violent that some of the grains are thrown free from their contacts. 

 For small amplitudes such as those ordinarily encountered in a trans- 

 mitter, a record would show only 4.50 cycles, the other frequencies 

 occurring in negligible amount; for intermediate amplitudes the 

 primary- series only occurs. 



The analyzer has been used in connection with the study of sus- 

 tained sounds and of the performance of acoustical apparatus. Fig. 9 

 is a record of the noise in a room originating from a buzzer as 



