available by a partial use of the method shown in Fig. 6.

_Memoranda of Experiments tried on the mains and service pipes of the
Southwark Water Company, between 4 and 9_ A.M. _of the 31st January,
1844. The wind blowing fresh from N.N.W._

The pressure at the water-works at Battersea was kept at 120 feet
during the experiments, and every service pipe or other outlet was
kept shut.

_1st Experiment._--Six standcocks, with one length of 2-1/2 inches
riveted leather hose 40 feet long, and one copper branch 4 feet to 5
feet long, with a jet 7/8 inch in diameter on each, were placed in six
plugs on a main 7 inches diameter, in Union-street, between
High-Street, Borough, and Gravel-lane, Southwark, at distances of
about 120 yards apart. The water was brought from the head at
Battersea, by 4250 yards of iron pipes 20 inches diameter, 550 yards
of 15 inches diameter, and 500 yards of 9 inches diameter.

1st. One standcock was opened, which gave a jet of 50 feet in height,
and delivered 100 gallons per minute.

With four lengths of hose the jet was 40 feet high, and the delivery
92 gallons per minute. When the branch and jet were taken off with one
length of hose the delivery was 260 gallons per minute.

2nd. The second standcock was then opened, and the jet from the first
was 45 feet high.

3rd. The third standcock was opened, and the jet from the first 40
feet high.

4th. The fourth standcock being opened, the first gave a jet of 35
feet high.

5th. The fifth being opened, the first gave a jet of 30 feet high.

6th. All the six being opened, the first gave a jet of 27 feet in
height.

_2nd Experiment._--Six standcocks were then put into plugs, on a main
9 inches diameter in Tooley-Street, the extreme distance being 450
yards, with hose and jets as in the first experiment. The water was
brought from the head at Battersea by 4250 yards of iron pipes of 20
inches diameter, 1000 yards of 15 inches diameter, 1400 yards of 9
inches diameter. The weather was nearly the same, but the place of
experiment was more protected from the wind than in Union-street.

1st. With one standcock open, a jet 60 feet in height was produced,
and 107 gallons per minute were delivered.

2nd. The second standcock was then opened, and the difference in the
first jet was barely perceptible.

3rd. Other two standcocks being opened, the first jet was reduced to
45 feet in height, and the delivery to 92 gallons per minute.

4th. All the