the motion of Liquids through short Efflux Tubes. 189 



The general influence of the charge upon the number of vibra- 

 tions can be easily rendered sensible by inclining the tube during 

 the efflux of the liquid. In this manner, by a gradual inclina- 

 tion from a vertical to a nearly horizontal position, the tone fell 

 rapidly, whereas by raising it more towards the vertical, the 

 tone rose higher and higher ; and, what is worthy of remark, 

 the differences in intensity were incomparably less now than when 

 the tube was fixed. The tone could be easily rendered constant 

 by inclining it gradually towards the vertical, according as the 

 level of the water fell. 



2. Influence of the diameter of Efflux Tube. 



In a preceding memoir Savart demonstrated that when a 

 liquid issues through a circular orifice in a thin plate, pulsations 

 are produced whose number is proportional to the square root of 

 the charge, and inversely proportional to the diameter of the 

 orifice. 



It has just been shown that with short efflux tubes the number 

 of vibrations conforms to the first of these laws, and what follows 

 will prove that the second law is also fulfilled. 



The experiments were made with efflux tubes of various dia- 

 meters, adapted successively to a tube 1"70 metre in height and 

 5 centimetres in diameter. From the following table it will be 

 seen that the numbers of vibrations may be considered inversely 

 proportional to the diameters of the efflux tubes. 



But here also it is evident that this law can be but an ap- 

 proximation to the true nature of the phienomcuou, inasmuch as 

 the tone makes sudden changes, and rises always some what higher 

 after each maximum of intensity has been passed. 



