A. M. Mayer— Researches in Acoustics. 245 
little effect on the number of beats required to produce a con- 
tinuous sensation. When a great increase in intensity was 
given to the pulses, their number had to be slightly increased, 
to produce the same continuous sensation as that ex perienced 
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UT, UT, UT, soL, UT, MI, sol, UT, 
with feebler pulses; but the difference was barely measurable. 
It is also important to remark, that, after the blending of the 
pulses has been once attained, a further increase in the ve elocity 
of the disc does not change the character of the sensation. Hx- 
treme velocities, of course, produce such violent agitations at the 
mouth of the resonator as to render experimenting impossl 
I now projected the above determinations into a curve ohh 
ing on the axis of abscissas the numbers of vibrations of mi 
various sounds and on the ordinates their corresponding 
tions of residual sensations. ‘Thus was produced the full- lined 
