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XXXVII. An Apparatus to show, simultaneously to several 

 hearers, the Blending of the Sensations of Interrupted 

 Tones. By Alfred M. Mayer, Ph.D.* 



IN the March number of this Journal, of the current year, 

 I described several forms of apparatus used in my ob- 

 servations on the frequency of the interruptions of simple 

 sounds required to blend these sounds and obtain from them 

 continuous and uniform sonorous sensations. These experi- 

 ments gave the data for the law connecting the pitch of a 

 sound with the duration of its residual sensation. 



The various apparatus described in that paper are, how- 

 ever, unsuited to exhibit the phenomena to more than one 

 hearer at a time. To enable many hearers to observe the 

 phenomena simultaneously, I have devised the apparatus 

 shown in the figure. 



H> 



J__J I L 



). ,, I 1 1 L 



A brass tube, T, of 1'25 centim. interior diameter and 1*8 

 centim. long, is cemented in a hole in the bottom of the glass 



* Communicated by the Author. 



