Abstracts of Technical Articles by Bell System Authors 



Computation of Inter facial Angles , Interzonal Angles, and Clinographic Pro- 

 jection by Matrix Methods} W. L. Bond. A way of setting up the general 

 crystallographic axes a, b, c on unit orthogonal axes x, y, z is used to afford a 

 matrix method of computing interfacial angles and zonal angles. It also 

 affords a method of making clinographic projections. 



A Current Distribution for Broadside Arrays which Optimizes the Relation- 

 ship between Beam Width and Side-Lobe Level? C. L. Dolph. A one- 

 parameter family of current distributions is derived for symmetric broadside 

 arrays of equally spaced point sources energized in phase. For each value 

 of the parameter, the corresponding current distribution gives rise to a 

 pattern in which (1) all the side lobes are at the same level; and (2) the beam 

 width to the first null is a minimum for all patterns arising from symmetric 

 distributions of in-phase currents none of whose side lobes exceeds that level. 



Design curves relating the value of the parameter to side-lobe level as well 

 as the relative current values expressed as a function of side-lobe level are 

 given for the cases of 8-, 12-, 16-, 20-, and 24-element linear arrays. 



Paper Capacitors Containing Chlorinated Impregnants — Mechanism of Sta- 

 bilization? L. Egerton and D. A. McLean. The stabilization of paper 

 capacitors containing chlorinated aromatic impregnants with small quanti- 

 ties of organic additives is well established commercially. Although for 

 practical reasons anthraquinone was chosen for initial commercial applica- 

 tion, other quinones are also effective, as are the nitroaromatics, maleic 

 anhydride, and sulfur. Evidence is given that the mechanism of stabiliza- 

 tion consists of the formation of barrier films on the electrodes. These bar- 

 rier films, which in certain cases may cover only the active points on the 

 electrode surface, reduce the catalytic decomposition of the chlorinated im- 

 pregnant by the electrode metal, prevent attack of the electrodes by liberated 

 hydrogen chloride, and hinder electrolytic action. It appears likely that the 

 film-forming properties of the stabilizers are dependent upon their oxidizing 

 power. A secondary effect of stabiHzers may be the formation of complexes 

 with aluminum chloride to diminish the activity of the latter or change the 

 nature of the reactions which it induces. Conductivity measurements in 



^American Mineralogist, Vol. 31, pp. 31-42 (1946). 

 ^Proc. LR.E. attd Waves and Electrons, June 1946. 

 ^ Indus, and Engg. Chemistry, May 1946. 



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