348 BELL SYSTEM TECHNICAL JOURNAL 



Mechanical design, as well as constructional work and preparation of the 

 detailed specifications for manufacture, was carried out by Y. L. Ronci, 

 D. P. Barry, F. H. Best, J. E. Clark, D. A. S. Hale, J. P. Laico and their 

 associates, including T. Aamodt, C. J. Altio, D. I. Baker, C. Blazier, R. H. 

 Griest, F. B. Henderson, W. Knoop, W. J. Leveridge, J. B. Little, C. Maggs, 

 J. A. Miller, H. W. Soderstrom, and F. W. Stubner. 



Permanent magnets were designed by P. P. Cioffi of the magnetics group 

 in the Physical Research Department. Numerous physico-chemical prob- 

 lems were solved by L. A. Wooten and his associates of the Chemical De- 

 partment. The work of J. B. Johnson and J. R. Pierce in allied fields 

 contributed to that described in this paper. In addition, many users of 

 magnetrons for radar purposes throughout the Laboratories collaborated 

 by conducting tests of magnetrons used in radar equipments. We wish to 

 acknowledge the support and advice of M. J. Kelly and J. R. Wilson under 

 whose general direction the work proceeded. 



Finally, the authors wish to thank L. M. Field, W. B. Hebenstreit, G. E. 

 Moore, A. T. Nordsieck, and N. Wax, who have read parts of the paper 

 critically. 



