_Test No. 2_.--To determine these points, a second test was made, on
March 31st, 1908, twenty days after the first one. In this test, green
aniline, red potassium permanganate, and bran were used. An observer
was placed at the end of the 10-in. line at _B_ (Fig. 2), and, by
letting a small quantity of water run from a relief-valve there, he was
able to note the time of the appearance of the colors and the bran.

The green was started in the upper end of the 10-in. pipe, at _A_ (Fig.
2), at 8.30 A.M. It appeared at _B_ in 22 min., and at _E_ in 3 hours and
52 min.

The red was started at 8.45 A.M. It reached _B_ in 21-1/2 min., but it
was so faded that the time of its appearance at _E_ could not be noted
exactly.

The bran was started at 9.00 A.M. It reached _B_ in 22 min., and
appeared at _E_ in 3 hours and 51 min.

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.