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.
" " 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.
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