78 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1954 



Additional cases are given permitting design relations to be extended 

 into the saturated range for the iron. 



REFERENCES 



1. Estimation and Control of Operate Time of Relays, Part I — Theory, R. L. 



Peek, Jr., page 109 of this issue. Part II — Applications, M. A. Logan, 

 page 144 of this issue. 



2. A. C. Keller, A New General Purpose Relay for Telejjhone Switching Sj'stems, 



B.S.T.J., 31, p. 1023, Nov. 1952. 



3. S. Evershed, Permanent Magnets in Theory and Practice, Institute of Electri- 



cal Engineers Journal (England) 58, 1919-1920. 



4. H. C Roters, Electromagnetic Devices, John Wiley and Sons, New York, 1941. 



5. S. P. Thompson and K. W. Moss, Proc. Physical Society of London, 21, p. 622, 



1909. 



6. W. B. f]llwood, Glass Enclosed Reed Relay, Elec. Eng. 66, p. 1104, Nov., 1947. 



7. E. B. Rosa and F. W. Grover, Bulletin Bureau of Standards, No. 169, 1912. 



8. R. L. Peek, Jr., Analysis of Measured Magnetization and Pull Characteristics, 



page 79 of this issue. 



9. Perrot and Picou, Comptes Rendus, 175, Dec. 9, 1922. 



10. R. L. Peek, Jr., Principles of Slow Release Relaj' Design, page 187 of this issue. 



