110 Scientific Proceedings, Royal Dublin Socie y 



Second Set. — Flow of Water discontinuous, 



Plotting these results, using as ordinates the calculated 

 pressures, and as abscissae the observed current-gauge readings 

 [which were heights in tenths of an inch at which the water in the 

 vertical tube stood above the centre of the efflux tube), the curves 

 shown in fig. 3 were obtained. 



It is remarkable how closely the curves approximated to straight 

 lines. This, of course, is an indication that the pressure-gradient 

 and the current-gauge reading both vary in the same way as the 

 current changes, and it is a fortunate circumstance, as it affords a 

 ready means of exterpolation. In this way, assuming that the 

 curve so long a straight line would continue as one, the dotted 

 portion of the curve of discontinuous flow in fig. 3 was obtained. 



