1248 THE BELL SYSTEM TECHNICAL JOUENAL, OCTOBER 1951 



associated with spheroids of lower mean diameters. These generalizations 

 cover suspension stabilization down to roughly 0.1% stabilizer. The con- 

 centration limits where suspending action begins are, however, of special 

 interest. Here it was found that the number of polyvinyl alcohol molecules 

 present became important — that is, for equal weight concentrations in the 

 vicinity of 0.005%, low molecular weight polymer (19,000) produced sta- 

 bilized (although large) spheres whereas the usual high molecular weight 

 polymer (95,000) was ineffective. 



Close to the maximum possible yield of well-formed spheroids was repro- 

 ducibly obtained in narrow size distribution and with average spheroid 

 diameters ranging from 5 microns to several millimeters in diameter — a 

 thousand-fold variation in dimensions. 



Elastic and Electromechanical Coupling Coefficients of Single-Crystal Bar- 

 ium Titanate. W. L. Bond^, W. P. Mason^, and H. J. McSkimin^ Letter 

 to the editor. Phys. Rev., v. 82, pp. 442-443, May 1, 1951. 



Making Small Spheres. W. L. Bond^ Rev. Sci. Instruments, v. 22, pp. 

 344-345, May, 1951. 



Submarine Telephone Cable With Submerged Repeaters. J. J. Gilbert^. 

 Electronics, v. 24, pp. 164, 168, 172+, June, 1951. 



Electrode Reactions in the Glow Discharge.* F. E. Haworth^ References. 

 //. Applied Phys., v. 22, pp. 606-609, May, 1951. 



Abstract — The reactions which occur at silver electrodes in a normal 

 glow discharge in air have been determined. These are: (1) formation of 

 AgN02 and some Ag20 at the anode at the rate of 3.4 /zg/coulomb; (2) loss 

 of metal from the cathode by chemical action at the rate of 3.5 /xg/coulomb 

 (probably the same reaction as (1) with subsequent loss of the reaction 

 products by the greater heating of the cathode, but this hypothesis has 

 not been established); and (3) normal sputtering loss at the cathode at the 

 rate of 0.4 /ug/coulomg. These processes result in building a conducting 

 layer on the anode. If the electrode separation is so small that the anode 

 extends into the region of the cathode fall, then the high electric field pulls 

 the newly formed and not very coherent growth upon the anode across into 

 a bridge between the electrodes. 



Storing Video Information.* k. L. Hopper^ Electronics, v. 24, pp. 122- 

 125, June, 1951. 



Abstract — Comparison of signal amplitudes along adjacent television 

 scanning lines can be made by storing the video information of one line for 

 63.5 microseconds. Storage is done in an ultrasonic delay line employing 

 a fused silica bar with quartz transducers. 



* A reprint of this article may be obtained on request. 

 » Bell Tel, Labs. 



