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BELL SYSTEM TECHNICAL JOURNAL 



In the next series of data, adjacent components had a difference in 

 loudness level of 5 db, that is, the first, third, fifth, etc., components 

 had the loudness level given opposite Ljt, and the even numbered com- 

 ponents were 5 db lower. (Tables X and XL) 



TABLE XI 

 Eleven Component Tones (AL = 5 db). 



In the following set of tests (Tables XII and XIII) the difference in 

 loudness level of adjacent components was 10 db. 



TABLE XII 

 Ten Component Tones (aL = 10 db) 



TABLE XIII 

 Eleven Component Tones (AL = 10 db) 



The next data are the results of tests made on the complex tone 

 generated by the Western Electric No. 3A audiometer. When 



