Hydraulics, 14!
other, and were supported at the juncture by a
prop.

They filled up the two openings round the ends
with lime and small stones, making them as tidy
as they could, and fitting small slides by which
Willie could close up the passages for the water
when he pleased. Nothing remained but to
solder a lead pipe into the top of the iron one,
guide this flexible tube across the ups and downs
of the ruins, and lay the end of it into the
trough.

At length Willie took his stand at the sluice, and
told Sandy to scramble up to the end of the lead
pipe, and shout when the water began to pour
into the trough. His object was to find how far
the sluice required to be shut down in order to
send up just as much water as the pipe could
deliver. More than that would cause a pressure
which might strain, and perhaps burst, their
apparatus.

He pushed the sluice down a little, and waited
a moment.

“Ts it coming yet, Sandy?” he cried.

“Not a drop,” shouted Sandy.

Willie pushed it a little further, and then knew
by the change in the gurgle below that the water
was rising in the well; and it soon began to spout
from the hole in the cover through which the
sluice-handle came up.