22 



AET. 10. T. TERADA. 



TABLE TV. 



o : diameter = 0.5 cm. 

 ©: „ =1.0 cm. 



Distances of holes from the OjDen end =0.8, 6.75, 11.75, 16.75 

 and 21.75. 



t=is° C 



4. Effects of Knots. 



Lord Rayleigh^^ proved that any sliglit contraction or ex^Dan- 

 sion of the section of a cylindrical resonator affects more or less 

 its natural pitch and that a broadening at the loop or a con- 

 traction at the node raises the natural pitch. The case treated 

 by him is confined to the case where the variation of the section 

 is very gradual. In the case of the syakuhati, the cliange of 

 the section due to the knots is rather abrupt thougli small in 

 amount. In order to test the effects due to diaphragms placed 

 in a cylindrical resonator, the following simple experiments 



1) Rayleigh, Theory of Sound. II. 



