176 A. M. Mayer— Researches in Acoustics. 
the resonators to sounds not in accord with their proper notes. 
The results agreed with those previously obtained on placing 
the resonator to the ear. now mounted an Ut, fork on its 
resonant case, and sounding it strongly before all the resonators 
of the harmonic series of Ut,, I caused all of the manometric 
flames connected with these resonators to vibrate, each giving 
the same number of serrations as when the Ut, fork was 
brought near its own resonator. The same result was obtained 
when the fork was separated from its case, with this important 
difference, however, that when the face of fork Ut, was brought 
near the mouth of the Ut, resonator, the flame connected with 
produced no effect on : 
The following experiment was now made to show the want 
of precision in the Jetuiiduanion of the exact pitch of sonorous 
elements by means of resonators. We have just seen that the 
Ut, fork could not vibrate the Ut, fork when both forks were 
on their cases, and when Ut, was flattened by two beats per 
nd; and also that a departure of four beats per second 
prevented Ut, from setting Ut, in sympathetic vibration, 
when both forks were off their resonant cases, and with their 
pew accompanied by 
ork, although it developed the serrations belonging to its own 
