From the average of these figures, the velocities were:
In the 16-in. pipe, 3.792 ft. per sec.
" " 10 " " 9.695 " " "
and the discharges were:
In the 10-in. pipe, 5.287 cu. ft. per sec.
" " 16 " " 5.293 " " " "
The application of the equation for equalized relative velocities, as in the first test, gives:
Velocity in 16-in. pipe = 9.705
" " 10 " " = 3.791
Discharge of 16 " " = 5.292
" " 10 " " = 5.293
These last figures would check exactly, except for dropping figures in the fourth decimal place.
The results of these two tests, considering that 20 days elapsed between them, are in very close agreement, and establish the fact that bran is an accurate medium of measurement.
Test No 3.—The 500 ft. of 10-in. pipe in the 16-in. line near the reservoir (Fig. 2) were replaced by 16-in. pipe in the summer of 1908.