Jackson — A New Method of Producing Tension in Liquids. Ill 



In this diagram the difference of the ordinates of the curves of 

 discontinuous and of continuous flow must represent the tension 

 produced in the water, plus the vapour-pressure of the water, or as 



20 30 40 50 60 70 80 90 100 110 120 130 



READINGS OF CURRENT - METER 



Fig. 3. 



the vapour-pressure is small, the difference practically represents 

 the tension produced. This evidently follows from the relation 

 p x - p 2 = F lt (0), as we have hoth the pressure pi for discontinuous 

 flow minus the vapour pressure p 2 , and the pressure <p x for con- 



