1018 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1952 



The Fatigue Test as Applied to Lead Cable Sheath. G. R. Gohn^ and 

 W. C. Ellis'. Proc. A.S.TJI., 51, pp. 721-740, 1951. 



This puper discusses the more important factors affecting the design of labora- 

 tory test metliods suitable for ol)taining significant fatigue data from reversed 

 bending tests on cantilever-beam specimens of lead cable sheathing alloys. 

 Data are presented to show the effect of cycling rate, temperature, shape of 

 specimen, alloy additions, and aging on fatigue life. The close correlation be- 

 tween bending fatigue tests on sti'ip specimens and full size sections of cable is 

 demonstratefl. The fatigue data are analyzed in terms of (1) cycle life versus 

 deflection, (2) cycle life versus strain, and (3) cycle life \'ersus stress. Photo- 

 micrographs illustrating representative laboratory and field failures are included. 



Thermal Conductivity of Germanium. A. Grieco' and H. C. Mont- 

 gomery\ Phys. Rev., 86, p. 570, May 15, 1952. 



Bell System Cable Sheath Problems and Designs. F. W. Horn' and R. B. 

 Ramsey'. Trans. A.I.E.E., 70, Part 2, pp. 1811-1816, 1951. (Monograph 

 1917). 



Powdered Standards for Spectrochemical Analysis. E. K. Jaycox'. 

 Applied Spectroscopy, 6, pp. 17-19, May, 1952. (Monograph 1978). 



Engineering for Low Product Cost and High Product Quality at the 

 Western Electric Company. A. C. Jones^ Ind. Quality Control, 8, pp. 

 53-59, May, 1952. 



The Approximation unth Rational Functions of Prescribed Magnitude 

 and Phase Characteristics. J. G. Linvill'. References. Proc. I.R.E., 

 40, pp. 711-721, June, 1952. 



A successive-approximations method is applied to the selection of network 

 functions having desired magnitude and phase variation with frequency. The 

 first ajjproximation, the first set of pole and zero locations, can be selected on 

 the basis of known solutions to similar problems or through use of a set of curves. 

 In succeeding approximations the i)ole and zero locations are adjusted to decrease 

 the deviation of the earlier approximations from the desired characteristics. The 

 process adjusts the magnitude and phase characteristics simultaneously. Its 

 flexibility permits accommodation of practical constraints not possible with 

 other methods. 



The Magnetic Structure of Alnico 5.E. A. Nesbitt' and R. D. Heiden- 

 reich'. Elec. Eng., 71, pp. 530-534, June, 1952. (Monograph 1981). 



In the investigation of Alnico 5, two problems arose. What is the mechanism 

 which enables the alloy to respond to heat treatment in a magnetic field? What 

 causes the alloy to have a high coercive force of 600 oersteds? The first prol:)]em 

 has been solved and progress has been made toward solving the second. 



1 Bell Telephone Laboratories 



2 Western Electric Company 



