ABSTRACTS OF TECHNICAL ARTICLES 1251 



vary with ciicuit iiuluctance and with the natuie of tlic electrode surfaces. For 

 inactive silver surfaces and an inductance of 0.10 /xlt the averaj^e value of the 

 time is about 0.007 n sec, and foi' active surfaces and the .same inductance O.OI 1 

 n sec. P\)r active surfaces and an in<luctance of 5 ^/i the aNcia^e \'alu< of the time 

 is 0.02 M sec. 



The electrode separation at which an arc strikes is determined from the oscillo- 

 scope traces and from a correction for the height of the mound of metal thrown 

 up by the arc. For active silver electrodes the avei'age sejjaration (at 40 or 45 

 volts) corresponds to a gross electric field of 0.8 X 10*^ volts/cm, and for inactive 

 silver electrodes to a field of 2.3 X 10^ volts/cm. These are probabh' better values 

 than earlier measurements of these fields. There has not yet been any success 

 in interpreting these phenomena in terms of fundamental processes. 



A Carrier Telegraph System for Short-llaul Applications. J. L. Hysko , 

 W. T. Rka' and L. C. Roberts'. Elec. Eng., 71, pp. ()2o-()30, July, 1952. 

 (Monograph 200()). 



This compact frequencj'-shift carrier telegraph system provides channels in 

 and above the voice range. The channel terminal unit incorporates arrangements 

 for liandling Teletypewriter Exchange Service supervisory signals and employs 

 no electromagnetic relays. 



Some Problems in Sampling Accounting Procedure. H. L. Jones . pp. 

 209-250. Am. Soc. for Quality Control. Quality control conference papers. 

 6th Annual Convention. N. Y., Am. Soc. Quality Control, 1952. 



Photometric Determination of Beryllium in Beryllium-Copper Alloys. 

 C. L. Luke' and M. E. Campbell^ Anal. Chem., 24, pp. 1056-1057, 

 June, 1952. (Monograph 2013). 



Steady Rotational Flow of Ideal Gases. R. C. Prim'. .//. Rationed Mech. 

 and Analysis, 1, pp. 425-497, July, 1952. 



This paper concerns the stead}- rotational flow of non-viscous and thermally 

 non-conducting gases subject to no extraneous force field. For the most part 

 attention is restricted to gases having constant specific heats. However, some of 

 the results are valid for more general classes of fluids. Uniformity of total flow 

 energy (stagnation enthalpy) or of entrojoy throughout the flow is not assumed. 

 The pre.sent work is intended to be a comprehensive treatment of the status (in 

 1949) or rotational flow theory from the point of view of the establishment of 

 general properties of such flows and the discovery and study of families of exact 

 solutions to the equations governing them. 



Finishing Metal Parts for Telephones. F. 1^. Rixck'. }retal Progress, 

 61, pp. 65-70, June, 1952. 



' Bell Telephone Laboratories 

 'Western Electric Company 



