1054 
Journal of Agricultural Research 
Vol. V, No. 23 
water-tight by flat rubber gaskets. The water passing through the 
notches or orifices falls into a concrete spill box 4 feet deep, 10 feet wide, 
and 9 feet long, which is connected with an auxiliary or waste reser¬ 
voir by one channel and with the calibrated tanks by another. The 
two 22-inch circular openings leading to these channels are separated 
by a steel plate, and a single disk on the lever arm makes a double shear 
