Bui. 854, U. S. Dept. of Agriculture. 
Plate VI. 
B. P. R. D-628 
Fig. I— Changing the Grade of the Flume. 
Note 12-incli plank laid along top of flume for men to work on while changing grade. 
p. R. D-«99 
Fig. 2.— Laying 10- Inch Concrete Tile in the Flume. 
