319 



PIERCE. — THEORY OF COUPLED CIRCUITS. 



where Jc is determined by the equation 



(49) \i) =r 



T5v « nomtiarison of (48) and (49) with equations (41) and (44) it 

 JleseeXt the method of Case II will give sharper resonance 



FiGnKK 10. Longwave adjustments corresponding to the short-wave 

 adjustments of Figure 9. 



than that of Case I whenever ^3 < V. With the high resistance de^ 

 tectors in ordinary use in wireless telegraphy, ,3 is generally much 

 less than .. and the sharp tuning is best ^^tai^^^^^^^^ 

 Case II ; that is, by fixing the condenser circuit (Circuit IV) by succes 

 ^ve approximations to a setting somewhere near its best value for the 

 given hlident waves, and then making the final adjustment by chang- 



"Cernumerical examples are given in the curves^ of Figure 11 

 For all these curves r is assumed to be .30, and r,, is taken as 1.0. 

 The values of >?3 are marked on the respective curves. 



Application to Actual Wireless Telegraphc ^«^^^- "T ^"J.^ '0?^ 

 ponding actual wireless -telegraph resonance curves taken with coupled 

 drcuits one of which has distributed capacity, will be less sharp than 

 he coXonding curves here computed and drawn - that as soon a ' 

 we know the damping constants and the coefficient of coupling ot the 

 2eleL telegraph drLits we can select from the curves here computed 



