292 Mr. R. H. M. Bosanquet on the Present 



words, because the aerial disturbances of higher orders are 

 never small enough to bo entirely neglected*. The lower har- 

 monies can be accordingly detected in the notes of these 

 resonators by the use of analyzing resonators of proper pitch, 

 whose interiors communicate with the ear. The twelfth can 

 be detected by an experienced ear, in some cases, without the 

 use of analyzing resonators. 



Section of speaking resonator, with organ-pipe mouthpiece, siphon with 

 stop, and reservoir for tuning ; also flexible tube for putting into the 

 ear when used as an analyzing resonator. This tube can be also used for 

 gas-flame experiments. 



With a rough experimental bellows furnishing an unsteady 

 wind, and these resonators, I have been able to repeat some of 

 the less difficult of the experiments of Konig. 



The only statement made by Konig as to the notes of which 

 the beats consist, is in Phil. Mag. fifth series, i. p. 425, where 

 he says that the two notes of a harmonic interval appear alter- 

 nately, but that the observation is difficult in the case of the 

 octave. .Now in all cases where beats exist, it is possible, by 

 the use of analyzing resonators communicating with the ear, 

 to determine in the manner pointed out by Helmholtz the dif- 

 ferent notes which vary in intensity, as well as any that do 

 not vary in intensity. But Konig does not appear to have 

 attempted this analysis at all. 



^ In the cases I have examined I have succeeded in determi- 

 ning the notes which were beating. In this determination, 

 which is sometimes of difficulty, I found it useful not only to 

 employ the analyzing resonators, but to move them about, as 



* See abstract of a paper " On the Conditions of the Transformation of 

 Pendulum-Vibrations^ Report of British Association, 1876 (Transactions 



of .Sections, p. 45). 



