ABSTUACTS OF TEC'IIXKAL AUTKLES 1015 



.1 Scanner for Rapid MeasKrement of Kuvrlopr Dclai/ Ih'slorlion. 1.. K. 

 Hint' and \\'. .). Alhkhshkim'. Proc. I.R.K., 40. pp. l")l !")!», Ai)ril, 

 l<).VJ. (.M()ii()^rai)li l«.)(;7). 



A inoasuiin^ (Icxicc is (l('scril)e(l which instaiitaiicously (hsplays tlie envelope 

 (lolay-i'io(iu(Micy charactpristic on a cathode-ray screen. Loop and one-way 

 lueasnienients ol' long-distance racho networks can he carried out. Tlie freciuencv 

 raiii^e extends from (il) to SO nief^acycles; the hndts of accuracy are 1 niiUinncro- 

 secoiid or 2 ])ei' cent of the nieasui'cd delay ranf:;e. Comparison of two charac- 

 teristics can he cairied out hv superposition of alternate scaiming ti'aces. 



The (l('\ice has h(H'n found us(>ful in nieasurinjj; the delay distortion of the TD-2 

 radio-iclay system and in desii>;ninii; and adjusting the delay ecjualizers needed 

 to correct it. 



Numerical Integration Xcar a Sinytdarilij. E. I.. Kaplan . ./. Math. 

 rhi/s., 31. pp. 1-28, April, 1952. (Monograph 1980). 



Measurement of Diffusion in Semiconductors by a Capacitance Method. 

 K. B. AIcAfee\ W. Shockley^ and M. Sparks'. Phys. Rev., 86, i)p. 

 137-138, April, 1952. 



Probing the Space Charge Layer in a p-n Junction. G. L. Pearson , 

 \V. T. Kead' and W. Shockley'. F'hys. Rer., 85, pp. 1055-1057, March 

 15, 1952. 



Control Methods Used in a Stiid.y of the ]'owels. G. E. Peterson and 

 11. L. Barney^. J. Acoust. Soc. Am., 24, pp. 175-184, March, 1952. 

 (Monograph 1982) 



Relationship.s between a listener's identification of a spoken vowel and its 

 properties as revealed from acoustic measurement of its sound wave have been 

 a subject of study b}- many investigators. Roth the utterance and the identifica- 

 tion of a vowel depend upon the language and dialectal backgrounds and the 

 \ocal and auditory characteristics of the individuals concerned. The ijurpose of 

 this pai)er is to discuss some of the control methods that have been used in the 

 evaluation of these effects in a vowel study program at Bell Telephone Labora- 

 tories. The plan of the study, calibration of recording and measuring ecjuipment, 

 and methods for checking the performance of both speakers and listeners are 

 described. The methods are illustrated from results of tests involving some 76 

 speakers and 70 listeners. 



Current Mtdtiplication in the Type-A Transistor. W. E. Sittner . 

 Proe. I.R.E., 40, pp. 448-454, April, 1952. (Monograph 1969). 



One of the basic phenomena exhibited by transistors is current multii)lication. 

 In transistors of the point-contact ty\K^. (one of these has been called the Ty])e-A), 

 the mechanism giving rise to this effect has been somewhat uncertain. Four 



' Bell Telephone Laboratories 



