92 



S. D. Shushakov 



125 



lOO 



75 



50 



25 



100 



75 



50 



25 



, H/2 



-Q / / 



^^5H 



lo) 



(b) 



Fig. 11. Graphs showing intensity A of multiple waves as a function of the number 

 of multiples n at various distances from source; predominant frequency 60c/s; 

 reflectmg layers: a— aluminium 0.62 cm, a^r 16° 48'; {a202)liaiQi) = 9.32; 6— glass 

 —0.6 cm, o^r = 15° 34', (a202)/(aiei) = 9.10; c— organic glass— 1.6 cm, a^r = 32°04', 



(azQiili^iQi) = 2.26 



