408 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1952 



Equivalent Temperature of an Electron Beam. M. E. Hines ., Letter 

 to the Editor., J. Appl Phys., 22, pp. 1385-1386, Nov., 1951. 



Bell System Cable Sheath Problems and Designs. F. W. Horn^ and 

 R. B. Ramsey'., Elec. Eng., 70, pp. 1070-1075, Dec, 1951. (Monograph 

 1917). 



Engineering Planning. H. S. Osborne^. J. Eng. Educ., 42, pp. 121- 

 125, Nov., 1951. 



Acceptance Inspection of Purchased Material. J. E. Palmer^ and E. G. 

 D. Paterson\ Ind. Quality Control, 8, pp. 23-27, Nov., 1951. 



A Note on the Partial Differential Equations Describing Steady Current 

 Flow in Intrinsic Semiconductors. R. C. Prim . Letter to the Editor. 

 /. Appl. Phys., 22, pp. 1388-1389, Nov., 1951. 



General Theory of Syynmetric Biconical Antennas. S. A. ScHELKUNorF\ 

 J. Appl. Phys., 22, pp. 1330-1332, Nov., 1951. (Monograph 1922). 



This paper presents the input admittance of a symmetric biconical antenna 

 of an arbitrary angle as the limit of a certain sequence of functions. The first 

 term of this sequence approaches the exact expressions for the input admittance 

 as the cone angle approaches either zero or 90°. For this reason our conjecture is 

 that this term represents a good first approximation for all angles. 



Artificial Dielectrics for Microwaves. W. M. Sharpless\ Proc. I. R. E., 

 39, pp. 1389-1393, Nov., 1951. (Monograph 1923). 



This paper presents a procedure for measuring the dielectric properties of 

 metal-loaded artificial dielectrics in the microwave region by the use of the 

 short-circuited hne method. Formulas, based on transmission-line theory, are 

 included and serve as guides in predicting the approximate dielectric properties 

 of certain loading configurations. 



1 B. T .L. 

 ■^ W. E. Co. 



