Bulletin 831, U. S. Dept. of Agriculture. 



PLATE XII, 



Fig. I. — Model of Testing Siphon. 



Dotted line at foot of model shows approxi- 

 mate shape of discharge lip of the models 

 used in the Throop College experiments. 



Fig. 2. — Model with Gage Board 

 and Several Piezometers At- 

 tached. 



Connections for piezometer tubes were of |- 

 inch brass tubing soldered flush to the inside 

 face of the siphon. 



