" " 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.

On May 12th, 1909, green aniline was started through the pipe at _A_ at
11.00 A.M., 11.30 A.M., and 12.00 P.M. In each case it appeared at _E_ in
3 hours and 31 min. This time is 20 min. less than that observed in the
tests of the previous year, and is due to the removal of the 10-in. pipe
from the 16-in. line and to the increasing smoothness of the interior
surface of the pipe.