1252 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1952 



Binary Counter Uses Two Transistors. II, L. Trent\ Electronics, 25, 

 pp. 100-101, July, 1952. 



Various timing and registry functions are provided by transistorized counter 

 with repetition rate from to 50 kc. It Iras stability witliout the usual sacrifice 

 in sensitivity and it permits either positive or negative triggering pulses to be 

 used. 



Structural Imperfections in Quartz Crystals. W. L. Bond' and J. 

 Andrus^ Am. Mineral, 37, pp. 622-632, July-August, 1952. (Mono- 

 graph 2001). 



A method for examining the topography of atomic planes is developed and 

 apphed to quartz crystals. It is thought to have higher resolution than the 

 method of Wooster and Wooster {Nature, 155, p. 786 (1945)), or that of Rama- 

 chandran (Proc. Ind. Acad. Sci., 19A, p. 280 (1944)). Because of the higher 

 resolution it gives more detailed information. A fair percentage of ostensibly 

 perfect quartz is shown to have shght irregularities. 



Packaging Principles Employing Plastics and Printed Wiring to Im- 

 prove Reliahility. W. J. Clarke' and N. J. Eich^. pp. 133-137. A. I. E. E., 



1. R. E. and R. T. M. A. Symposium, Progress in Quality Electronic 

 Components. Proceedings, Wash., D. C, May 5-7, 1952. Wash., D. C, 

 R. T. M. A., 1952. 



Miniaturized Components for Transistor Action. P. S. Darnell^ pp. 

 51-57. A. I. E. E., I. R. E. and R. T. M. A. Symposium, Progress in 

 Quality Electronic Components. Proceedings, Wash. D. C, May 5-7, 

 1952. Wash., D. C, R. T. M. A., 1952. 



Some Basic Concepts of Quality Control. G. D. Edwards^ Shewhart 

 Medalist Address. Ind. Quality Control, 9, pp. 9-10, July, 1952. 



Effective Sum of Multiple Echoes in Television. A. D. Fowler* and H. 

 N. C^hristopherI. S. M. P. T. E., JL, 58, pp. 491-500, June, 1952. 



Observers compared the interfering effect of multiple echoes with that of 

 single echoes in black-and-white television pictures. The multiple echoes were 



2, 4 or 8 echoes of equal strength but different delays. The single echoes were 40, 

 35 or 30 db weaker than the main signal. A method for estimating addition 

 effects of several echoes is presented and demonstrated to be consistent with the 

 test results. 



Design Factors Influencing the Reliability of Relays. J. R. FRY^ pp. 

 101-107. A. I. E. E., I. R. E. and R. T. M. A. Symposium, Progress in 



1 Bell Telephone Laboratories 



