172 Dr„ A. M. Mayer's Researches in Acoustics. 



describing the sinusoids of the vibrating bar. Thus the 

 weight and friction of the cork introduced no error. In a 

 similar manner I obtained the velocity, marked M in fig, 1, 

 by vibrating a rod of aluminium. The frequency of the 



Ffc. 1. 



8 em. 



longitudinal vibrations of the rod was measured while the 

 cork at the end of the rod was vibrating in the mouth of the 

 tube. The result agrees closely with Kayser's. It is needless 

 to discuss the curves of fig. 1. 



