Mr. Wheatstohe on Resonance* IBl 



The vibrations of the tongue itself correspond with a very low 

 sound ; but being placed before the cavity of the mouth, the form 

 and dimensions of which are capable of various alterations by the 

 motions of the tongue and the lips, when the number of vibrations 

 of the contained volume of air is any multiple of the original vibra- 

 tions of the tongue, a sound is produced, corresponding to the 

 modification of the oral cavity. 



Supposing the primitive sound of the tongue to be C\ the series 



of sounds which it can produce by multiple reciprocation will be as 



follows. 



Multiples of the ordinal vibrations of the tongue, 



f. ..2* ..3. ..4.. .5. .,6. ..7. ..8. ..9. ..10. ..11. ..12. ..13. ..14... 15.!. fe etc. 32. 



Corresponding sounds. 

 Ci C2 G C3 E G Bb C* D E F+ G A- Bl, B Qs etc. C« 



If the original sound be any other note, another series will arise, 

 but the intervals of the successive sounds will always preserve the 

 above relations. By the usual Jew's harps the three first sounds 

 of the series cannot be produced, the dimensions of the cavity of 

 the mouth not being sufficiently large to reciprocate them. 



The scale above exhibited is evidently too incomplete and too 

 defective, to allow even the most simple melodies to be performed 

 on a single Jew's harp ; but the deficiencies may be supplied by 

 employing two or more of these instruments. Mr. Eiilenstein, by 

 availing himself of the resources afforded him by the scales of six- 

 teen Jew's harps, is able to modulate through every key, and to 

 produce effects truly original, and of extreme beauty. Those who 

 have heard only the rude twanging to which the performance of 

 this instrument in ordinary hands is confined, can have no idea of 

 the melodious sounds which, under Mr. Eulenstein's management, 

 it is capable of producing. 



§ 8. the following experiment will prove the accuracy of the 



