340 



BELL SYSTEM TECHNICAL JOURNAL 



Appendix III 



Equivalent Transducers and Transformation Formulas 

 Transformation 1 



4 o 



-o-VSAA-'*- 



Equivalent when 



b = a(\ + a), c = 1 + a. 

 Transformation 2 



Equivalent when 



b = 



c = 



1 + a 



16 For transformations of simple equivalent two-terminal or impedance networks 

 containing two kinds of general impedances, see Appendix 111 of paper in footnote 1. 

 Also U. S. Patent No. 1,644,004 to O. J. Zobel, dated October 4, 1927. 



