24 



AET. K». — T. TEKADA. 



near the node, is null at a certain distance from it, and thence 

 increases almost proportionally with its distance from the node. 

 c) That the correction increases with the decrease of the 

 sectional area of the passage, first slowly and then rapidly, as is 

 also shown in the following table : 



TABLE Y. 



T^ength of the diaphragm = 1 cm. 



Diameter of the 



Correction due to the diaphragm when its 

 end is at the open end. 



The intensity of resonance falls rapidly with the decrease 

 of the diameter of the passage, when it becomes small. AMien 

 the passage is narrow, the pipe is rather to be regarded as a 

 system of two resonators communicating with each other by a 

 narrow passage. In such a system, two modes of the vibration are 

 possible. The one mode which was experimented with above is 

 tliat in which the i)hase of the air motion is everywhere nearly the 

 ^ame. The other mode, in which the motions in the two parts are 

 opposite, however, was entirely left out of consideration. Indeed, 

 when the intermediate passage becomes narrow, the former mode 

 becomes faint, while the latter becomes predominant. This fact 

 may easily be shown by experiments. For the present problem, 



