1of a palm, that it may be able to take the end
of the pipe which
follows. And each length of pipe is fixed with iron clamps to the timbers of
the shaft, that it may remain stationary. Through this continuous series
of pipes, the water is drawn by the balls of the chain up out of the sump as
far as the tunnel, where it flows out into the drains through an aperture in
the highest pipe. The balls which lift the water are connected by the iron
links of the chain, and are six feet distant from one another; they are made
of the hair of a horse's tail sewn into a covering to prevent it from being
pulled out by the iron clamps on the drum; the balls are of such size that
one can be held in each hand. If this machine is set up on the surface of
the earth, the stream which turns the water-wheel is led away through openÂ
air ditches; if in a tunnel, the water is led away through the subterranean
drains. The buckets of the water-wheel, when struck by the impact of the
stream, move forward and turn the wheel, together with the drum, whereby
the chain is wound up and the balls expel the water through the pipes. If
the wheel of this machine is twenty-four feet in diameter, it draws water from a
shaft two hundred and ten feet deep; if thirty feet in diameter, it will draw
water from a shaft two hundred and forty feet deep. But such work requires
a stream with greater water-power.
follows. And each length of pipe is fixed with iron clamps to the timbers of
the shaft, that it may remain stationary. Through this continuous series
of pipes, the water is drawn by the balls of the chain up out of the sump as
far as the tunnel, where it flows out into the drains through an aperture in
the highest pipe. The balls which lift the water are connected by the iron
links of the chain, and are six feet distant from one another; they are made
of the hair of a horse's tail sewn into a covering to prevent it from being
pulled out by the iron clamps on the drum; the balls are of such size that
one can be held in each hand. If this machine is set up on the surface of
the earth, the stream which turns the water-wheel is led away through openÂ
air ditches; if in a tunnel, the water is led away through the subterranean
drains. The buckets of the water-wheel, when struck by the impact of the
stream, move forward and turn the wheel, together with the drum, whereby
the chain is wound up and the balls expel the water through the pipes. If
the wheel of this machine is twenty-four feet in diameter, it draws water from a
shaft two hundred and ten feet deep; if thirty feet in diameter, it will draw
water from a shaft two hundred and forty feet deep. But such work requires
a stream with greater water-power.
The next pump has two drums, two rows of pipes and two
drawingÂ
chains whose balls lift out the water; otherwise they are like the last pump.
This pump is usually built when an excessive amount of water flows into the
sump. These two pumps are turned by water-power; indeed, water draws
water.
chains whose balls lift out the water; otherwise they are like the last pump.
This pump is usually built when an excessive amount of water flows into the
sump. These two pumps are turned by water-power; indeed, water draws
water.
The following is the way of indicating the increase or decrease of the
water in an underground sump, whether it is pumped by this rag and chain
pump or by the first pump, or the third, or some other. From a beam which
is as high above the shaft as the sump is deep, is hung a cord, to one
end of which there is fastened a stone, the other end being attached to a
plank. The plank is lowered down by an iron wire fastened to the
other end; when the stone is at the mouth of the shaft the plank
is right down the shaft in the sump, in which water it floats. This
plank is so heavy that it can drag down the wire and its iron clasp and
hook, together with the cord, and thus pull the stone upwards. Thus, as
the water decreases, the plank decends and the stone is raised; on the
contrary, when the water increases the plank rises and the stone is lowered.
When the stone nearly touches the beam, since this indicates that the water
has been exhausted from the sump by the pump, the overseer in charge of the
machine closes the water-race and stops the water-wheel: when the stone
nearly touches the ground at the side of the shaft, this indicates that the
sump is full of water which has again collected in it, because the water raises
the plank and thus the stone drags back both the rope and the iron wire;
then the overseer opens the water-race, whereupon the water of the stream
again strikes the buckets of the water-wheel and turns the pump. As
workmen generally cease from their labours on the yearly holidays, and
water in an underground sump, whether it is pumped by this rag and chain
pump or by the first pump, or the third, or some other. From a beam which
is as high above the shaft as the sump is deep, is hung a cord, to one
end of which there is fastened a stone, the other end being attached to a
plank. The plank is lowered down by an iron wire fastened to the
other end; when the stone is at the mouth of the shaft the plank
is right down the shaft in the sump, in which water it floats. This
plank is so heavy that it can drag down the wire and its iron clasp and
hook, together with the cord, and thus pull the stone upwards. Thus, as
the water decreases, the plank decends and the stone is raised; on the
contrary, when the water increases the plank rises and the stone is lowered.
When the stone nearly touches the beam, since this indicates that the water
has been exhausted from the sump by the pump, the overseer in charge of the
machine closes the water-race and stops the water-wheel: when the stone
nearly touches the ground at the side of the shaft, this indicates that the
sump is full of water which has again collected in it, because the water raises
the plank and thus the stone drags back both the rope and the iron wire;
then the overseer opens the water-race, whereupon the water of the stream
again strikes the buckets of the water-wheel and turns the pump. As
workmen generally cease from their labours on the yearly holidays, and