ABSTRACTS OF TECHNICAL ARTICLES 703 



Phase Angle of Vacuum Tube Tramconductance at Very High Fre- 

 quencies.* F. B. Llewellyn. Theoretical considerations indicate 

 that the transconductance of a vacuum tube exhibits a phase angle 

 when the transit time of electrons from cathode to anode becomes an 

 appreciable fraction of the high-frequency period. Measurements 

 show that such a phase angle actually occurs and that its behavior is in 

 general agreement with the theoretical predictions. 



Application of Sound Measuring Instruments to the Study of Phonetic 

 Problems.^ John C. Steinberg. This paper gives the results of a 

 period by period analysis of the vowel sound waves occurring when the 

 sentence "Joe took father's shoe bench out" was spoken. Such an 

 analysis gives an approximate picture of the time variations in r.m.s. 

 amplitude of the wave, frequency of voice fundamental, and frequency 

 regions of overtone reenforcement. Although the study is confined to 

 a few sounds and one speaker's voice, it illustrates a method of ap- 

 proach to studies of speech production and measurement. 



*Proc. I. R. E., August, 1934. 



^ Jour. Acous. Soc. Am., July, 1934. 



