108 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1954 



iron reluctance is a major component through the full range of opera- 

 tion, 



ACKNOWLEDGMENT 



The procedures described in this article incorporate contributions pro- 

 posed or developed by H. N. Wagar, M. A. Logan, Mrs. K. R. Randall, 

 and others. 



REFERENCES 



1. R. L. Peek, Jr., and H. N. Wagar, Magnetic Design of Relays, page 23 of this 



issue. 



2. A. C. Keller, New General Purpose Relay, B.S.T.J., 31, p. 1023, Nov., 1952. 



3. H. N. Wagar, Relay Measuring Equipment, page 3 of this issue. 



4. W. B. Ellwood, A New Magnetomotive Force Gauge, Rev. Sci. Instr., 17, p. 



109, 1946. 



5. Estimation and Control of the Operate Time of Relays : Part 1 — Theorj^ R. L. 



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

 144 of this issue. 



6. Kennelly, Trans. A.I.E.E., 8, p. 485, 1891. 



