1264 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER, 1953 



Slade, F. D.' 

 Mechanized Billing of AMA Toll Messages, A.I.E.E., Trans. Com- 

 mun. and Electronics, 6, pp. 175-182, May, 1953. 



Slepian, D.^ 

 On the Number of Symmetry Types of Boolean Functions on n 

 Variables, Can. J. Math., 5, pp. 185-193, 1953. 



Tanenbaum, M., see G. L. Pearson. 



Van Siclen, H. E.' 



What We Did to Cut Costs of Finishing Telephone Woodwork, Ind. 

 Finishing, 29, pp. 44-52, Apr., 1953. 



Van Tassel, E. K., see J. A. Coy. 



Williams, H. J.,^ and R. M. Bozorth^ 



Magnetic Study of Low Temperature Transformation in Magnetite, 

 Rev. Mod. Phys., 25, pp. 79-80, Jan., 1953. 



Wood, E. A.' 



Simple Attachment for Low Temperature Use of an X-Ray Diffraction 

 Camera, Rev. Sci. Instr., 24, pp. 325-326, Apr., 1953. 



Wooley, M. C.,^ G. T. Kohman,^ and W. McMahon,^ 



Polyethylene Terephthalate — Its Use as a Capacitor Dielectric, 

 A.I.E.E. Trans. Commun. and Electronics Sect., 5, pp. 33-37, Mar., 

 1953 (Monograph 2125). 



The steady increase in the severity of operating conditions for capacitors 

 and the need for more diverse characteristics has spurred the search for 

 new and better capacitor dielectrics. The synthetic plastics industry, which 

 is the source of a number of useful dielectric materials, has recently produced 

 a new and promising dielectric in film form known as polyethylene tereph- 

 thalate or "Mylar." This material is unusually strong, has a high softening 

 point, and is available in very thin films which makes it especially suitable 

 for capacitor insulation. The electrical characteristics of capacitors wound 



» Bell Telephone Laboratories. 



» American Tele|Dhone and Telegraph Company. 



» Western Electric Company, Inc. 



