ACOUSTICAL INVKSTHiATlOX OF Till: JAPAXESK IJAAflJoO I'IIT:. 1 ') 



The eftec't of tlu» thickness of tlie pipe or of tlie plate is very 

 small, provided it is very small in comparison with the wave 

 length. The relation above obtained is, therefore, ap])licable also 

 to the case of the sf/ttl-ithaii as shown in the latter part of this 

 paper. 



3. Lateral Openings. 



Lord Rayleigli^ in his paper on resonance, has suggested a 

 method for the theoretical treatment of the lateral openings of 

 wind instruments. However, as far as I am aware, no further 

 result either theoretical or experimental has been published. 

 The necessity of investigating the functions of the lateral openings 

 for the explanation of the phenomena connected with the syahu- 

 hati, led me to undertake a series of experiments which T shall 

 now describe. 



A cylindrical pipe was made of a zinc plate, 0.'~) mm. thick, 

 with an inner diameter of 4.0cm. and a length of 1 ra. Along 

 scale printed on paper was attached to the side of the cylinder. 

 A cylindrical tank with a depth of over 1 m., was filled with 

 water in which the cylindrical pipe was inserted vertically so as 

 to var}^ the length of the air column inside the resonator when 

 the pipe was laised or lowered by hand. Lateral holes of 

 diHerent diameters were made in the side of the pipe at different 

 positions. For different positions of the holes, the lengths of the 

 air columns were determined which give respectively the maximum 

 resonance for different tuning forks. 



For the degree of accuracy required for the present purpose, 

 the raising or lowering of the pipe could conveniently ))e done 

 with one hand, while the other hand held the fork near the 



1) Ravleigli, loc. cit. 



