Bulletin 1026, U. S. Dept. of Agriculture. 



PLATE VII. 



Fig. I. — Common Type of Division Box in which the Dividing Board 

 IS Movable and is held in Place by a Chain Hooked over Nails in a 

 Cross Piece. 



Fig. 2. — Division Box on the Roberts Lateral 

 of the Larimes and Weld Canal. The Divid- 

 ing Board is Controlled by Wheels Work- 

 ing on Threaded Rods Fastened to the 

 Board. 



