PHENOMENA OF SUCTION. 



309 



would flow out ; but between b and c the pressure may 

 be considerably less than the pressure of the atmosphere, 

 and hence, if an aperture be made at d, no water will 

 flow out, but air will enter the tube, and the jet will 

 assume again the form, fig. 202 B. If, instead of at d, 

 an aperture be made at the lower side at 0, and a tube 

 e fi % 202 E, of moderate length be inserted in the 

 aperture, while the other end dips in water, the 



A 



o 



CALIFORNIA. 



FIG. 203 (real size). 



sure of the atmosphere upon the free surface of the 

 water will cause the latter to ascend in the tube ef, 

 ind to flow out with the water discharged by the tube 



These effects of efflux through tubes which become 

 suddenly wider at one point, are usually termed 'phe- 

 lomena of suction ;' they are produced by other liquids 

 is well as by water. 



