684 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1956 



lizing the exponential character of the forward characteristic. However, 

 as is to be expected from devices with the characteristics described in 

 this paper, the most immediate apphcation will be found in power sup- 

 plies. 



ACKNOWLEDGMENTS 



It is obvious that the work reported in this paper is not the result 

 of one man's labor. Much of the stimulus and many of the ideas are 

 those of K. D. Smith. Other members of the Semiconductor Device 

 Department who have contributed considerably to the development of 

 these devices are R. L. Johnston, R. Ruhson, and R. C. Swenson. D. A. 

 Kleinman, J. L. Moll and I. M. Ross have been most helpful in dis- 

 cussing the theoretical aspects of these devices. The author wishes to 

 thank H. R. Moore for his suggestions on protecting the silicon rectifiers 

 against large overloads. 



