586 BELL SYSTEM TECHNICAL JOURNAL 



and in the lower class "constant k" and M-type wave-filters from 

 formulae (21) to (31). Owing to the large number of intermediate 

 equations which it was necessary to obtain before direct com|)uta- 

 tions could suitably be made for the charts, these equations will not 

 be given here, but only a brief designation of the resulting charts 

 together with the approximations involved, if any. 



The units employed throughout are the attenuation unit and the 

 radian. The former unit applies to A, D, Lm, Lx, Gmi, Gxi, P, L, 

 and L, and the latter unit to B, S, //,„■.., Ih- and Q. 



Transfer Loss 

 This is determined through the propagation constant, r=A-{-iB.\ 



Charts 1, 2, and '.i. — .1 and cB in and about transmitting^ band; 

 (■ = ± 1 has the sign of V. 



Churl 4. — A in attenuating band; 



V- negligible compared with {U+ JT-)>0. 



Chart ."). — -1 at maximum attenuation; 



{U-\-U") negligible compared with 1'-. 



Terminal Losses, L,„ and Lx 



Chart G. — L,„ in transmitting band; 

 Vk neglected. 



Chart 7. — L,„ at eritical frequencv; 

 Uk=-l. 



Chart 8. — L,„ in attenuating Inind; 

 Vk neglected. 



Chart y. — -Lm at maximum attenuation of M-lype; 

 1 — »r 



Chart 10. — Lx in transmitting Imnd; 

 Vk neglected. 



Chart 11. — Lxat eritical frequency; 

 Uk=-\. 



Chart 12. -Lx in attenuating band; 

 Vk neglected. 



