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A. M. Mayer—Researches in Acoustics. 333 
The development of the applications and of the further illus- 
trations of these discoveries would occupy too much space; 
must therefore restrict myself to mentioning some of the most 
interesting. Let a man read a sentence over and over again 
with the same tone and modulation of voice, and while he is 
so doing forcibly sound ac’ pipe (256 double vibrations), A 
remarkable effect is produced, which varies somewhat with the 
voice experimented on, but the ordinary result is as follows. It 
appears as though two persons were reading together, one with 
a grave voice (which is found by the combination of all the rea- 
der’s real vocal sounds below c in pitch, or having less than 256 
double vibrations), the other with a high-pitched voice, gener- 
ally squeaky and nasal, and, I need not add, very disagreeable. 
course the aspirates come out with a distressing promin- 
ence. Ihave observed many curious illustrations of this change 
in the quality of the tone of the voice, caused by the entire or 
partial obliteration of certain vocal components, while listening 
Pa steam whistle, or in 
ine action on the ear of all the components or partial tones, 
low it in pitch. Thus the higher the pitch of any component or 
r of lower components which 
y * 
Sound of which, after its higher components have disappeared, 
at eep simple tone. This bass sound holds its own with total 
x iperence to the clatter of horses, or to any sounds above it in 
- It dies out with a smooth gradient, generally without 
- slightest indentation or break produced by the other sounds 
the street. Indeed, in this case, as in all others where one 
