A. M. Mayer — Researches in Acoustics. 



85 



velocities are those of Keyser, who closed the end of the tube 

 with a cork attached to the end of a steel-bar, while the other 

 end of the bar was securely clamped. The frequency of the 

 transverse vibrations of the bar was registered by a style 

 describing the sinusoids of the vibrating bar. Thus the 



em. 



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 aluminum. The frequency of the vibra- 

 tions of the rod were measured while the cork at the end of 

 the rod was vibrating in the mouth of the tube. The result 

 agrees closely with Keyser's. It is needless to discuss the 

 curves of fig. 1. 



