﻿On the Instability of Gaseous Jets. 













J£, 



s~ 





O-002O 

























a/ / 



/ 







V 







// 



























C-OOIO 

































o 0005 









; 







In the upper curve there is great irregularity in the 

 neighbourhood of the flaring-pressure; this appeared in all 

 the curves. The flaring-pressure is shown by the arrow in 

 the curve. 



Conclusion. 



The instability of a jet depends upon the vorticity at its 

 surface. Any tubularity of the orifice from which the jet 

 issues communicates stratified formation to the jet, and thus, 

 in general, lowers the pitch of the sonorous disturbances to 

 which it is sensitive, and diminishes the sensitiveness. The 

 flaring-pressures of the flames from holes in thin plates are 

 very much higher than those of the flames from tubes ; on 

 this account the flames from the former orifices are long and 

 stiff. The transition of velocity at the surface of such jets 

 is sudden, the pitch of the sonorous disturbances to which 

 the jets are sensitive is very high, and the sensitiveness is 



