LOUDNESS 



415 



TABLE IX 

 Eleven Component Tones (AL = 0) 



the data pertains to the loudness levels of the tones. Opposite Lk are 

 given the common loudness levels to which all the components of the 

 tone were adjusted for a particular test, and in the next line the results 

 of the test, that is, the observed loudness levels (Lobs.), are given. 

 Directly beneath each observed value, the calculated loudness levels 

 (Lcaic.) are shown. The three associated values of Lk, Loha., and 

 Lcaic. in each column represent the data for one complete test. For 

 example, in Table VIII, the first tone is described as having ten com- 

 ponents, and for the first test shown each component was adjusted to 

 have a loudness level (L^) of 67 db. The results of the test gave an 

 observed loudness level (I-obs.) of 83 db for the ten components acting 

 together, and the calculated loudness level (Lcaic.) of this same tone 

 was 81 db. The probable error of the observed results in the tables is 

 approximately ± 2 db. 



TABLE X 



Ten Component Tones (AL = 5 db) 



