16 
MEASUREMENT AND DIVISION OF WATER. 
with the necessary modifications. lie terms it the spill-box, 
a more suggestive name than that proposed by Mr. Foote. 
In use, Mr. Graves constructs a weir in the canal and j 
places the box at one side, always using two if possible, j 
one at each side, to save fall and expense. The spill-box 
is about 1G feet long, 14 inches wide, set perfectly level. 
The crest next the canal is brought to a sharp edge, and 
Fig. 3 . 
so are the 2x4 pieces on that side of the box. The gate 
for opening the orifice is of galvanized iron, worked by a 
rod and wing nut from the end of the box, so that it may 
be adjusted to any desired opening and locked. The side 
of the opening is protected by strips of galvanized iron, 
with the double purpose of protecting the orifice from sur- 
