POTENTIAL ANALOGUE METHOD OF NETWORK SYNTHESIS 365 



4. S. Darlington, Papers presented at meetings of the Basic Science Division of the 



A.I.E.E., January 1949 and January 1950. 



5. S. Butterworth, On the theory of filter amplifiers, Experimental Wireless, 7, pp. 536- 



541, 1930. 



For fuller information on the properties of the logarithmic potential the reader 

 might find the following texts useful: 



O. D. Kellogg, Foundations of Potential Theory, JuUus Springer, Berlin, 1929; Chap- 

 ter 12, The Logarithmic Potential. 

 W. F. Osgood, Functions of a Complex Variable, Hafner Publishing Company, New 



York, 1948; Chapter 8, The Logarithmic Potential; and Chapter 9, Conformal 



Mapping of a Simply Connected Region. 

 E. Weber, Electromagnetic Fields, Theory and Application — Volume I, Mapping of 



Fields, John Wiley and Sons, Inc., New York, 1950; Chapter 7, Two-Dimensional 



Analytic Solutions. 

 A. G. \Vebster, Partial Differential Equations of Mathematical Physics, G. E. Stechert 



and Co., New York, 1927; Chapter 5, Methods of Green, Potentials, Boundary 



Problems. 



