212 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952 



niques will be generally applicable even though the number and volume of items 

 purchased and the number of supphers involved may in some cases differ widel}'. 

 In this presentation, stress has been placed on a discussion of the broader gauge 

 factors underlying the engineering planning of inspection procedures rather than 

 on specific sampling and control techniques. 



Analysis of Audio-Frequency Atmospherics * R. K. Potter^ Proc 

 I.R.E., 39, pp. 1067-1069, Sept., 1951. 



Sound portrayal techniques used in studies of speech and noise reveal the 

 structure of atmospheric disturbances well known to long-wave radio and ocean- 

 cable engineers as "whistlers," "swishes," and tweeks." It is suggested that 

 renewed investigation of these effects, using modern analyzing tools, might yield 

 information of considerable scientific interest. 



Reflection of Electromagnetic Waves from Slightly Rough Surfaces* 

 S. 0. RiceK Communications on Pure and Applied Math., 4, pp. 351-378, 

 Aug., 1951. 



Color Television and Colorimetry* W. T. Wintringham^ Proc. I.R.E., 

 39, pp. 1135-1172, Oct., 1951. 



The high lights of the history of color measurement and of color photography 

 are reviewed. Following this introduction, the principles of modern three-color 

 colorimetry are developed from a hypothetical experiment in color matcliing. 

 The conventional theory of "perfect color reproduction" by color television is 

 built up from colorimetric background. Some of the difficulties to be expected 

 in applying colorimetry to color television are brought out. 



Finally, there is some discussion which tends to show that colorimetry maj'' 

 not be a sufficiently powerful tool to provide answers to all of the questions which 

 wiU arise in the reproduction of scenes in color b}' television. The advantage of 

 colorimetrj^ as a background is indicated, however. 



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

 1 Bell Tel. Labs. 



