1stream can turn it.
This water, falling into a race, runs therefrom on to a
second high and heavy wheel of a lower machine, whose pump lifts the water
out of a deep shaft. Since, however, the water of so small a stream cannot
alone revolve the lower water-wheel, the axle of the latter is turned at the start
with a crank worked by two men, but as soon as it has poured out into a pool
the water which has been drawn up by the pumps, the upper wheel draws
up this water by its own pump, and pours it into the race, from which it
flows on to the lower water-wheel and strikes its buckets. So both this
water from the mine, as well as the water of the stream, being turned down
the races on to that subterranean wheel of the lower machine, turns it, and
water is pumped out of the deeper part of the shaft by means of two or
three pumps.16
second high and heavy wheel of a lower machine, whose pump lifts the water
out of a deep shaft. Since, however, the water of so small a stream cannot
alone revolve the lower water-wheel, the axle of the latter is turned at the start
with a crank worked by two men, but as soon as it has poured out into a pool
the water which has been drawn up by the pumps, the upper wheel draws
up this water by its own pump, and pours it into the race, from which it
flows on to the lower water-wheel and strikes its buckets. So both this
water from the mine, as well as the water of the stream, being turned down
the races on to that subterranean wheel of the lower machine, turns it, and
water is pumped out of the deeper part of the shaft by means of two or
three pumps.16
If the stream supplies enough water straightway to turn a higher and
heavier water-wheel, then a toothed drum is fixed to the other end of the
axle, and this turns the drum made of rundles on another axle set below it.
To each end of this lower axle there is fitted a crank of round iron curved
like the horns of the moon, of the kind employed in machines of this
description. This machine, since it has rows of pumps on each side,
draws great quantities of water.
heavier water-wheel, then a toothed drum is fixed to the other end of the
axle, and this turns the drum made of rundles on another axle set below it.
To each end of this lower axle there is fitted a crank of round iron curved
like the horns of the moon, of the kind employed in machines of this
description. This machine, since it has rows of pumps on each side,
draws great quantities of water.
Of the rag and chain pumps there are six kinds known to us, of which
the first is made as follows: A cave is dug under the surface of earth or in a
tunnel, and timbered on all sides by stout posts and planks, to prevent either
the men from being crushed or the machine from being broken by its collapse.
In this cave, thus timbered, is placed a water-wheel fitted to an angular axle.
The iron journals of the axle revolve in iron pillows, which are held in timbers
of sufficient strength. The wheel is generally twenty-four feet high,
occasionally thirty, and in no way different from those which are made for
grinding corn, except that it is a little narrower. The axle has on one side
a drum with a groove in the middle of its circumference, to which are fixed
many four-curved iron clamps. In these clamps catch the links of the chain,
which is drawn through the pipes out of the sump, and which again falls,
through a timbered opening, right down to the bottom into the sump to a
balancing drum. There is an iron band around the small axle of the
balancing drum, each journal of which revolves in an iron bearing fixed to a
timber. The chain turning about this drum brings up the water by the
balls through the pipes. Each length of pipe is encircled and protected by
five iron bands, a palm wide and a digit thick, placed at equal distances from
each other; the first band on the pipe is shared in common with the
preceding length of pipe into which it is fitted, the last band with the succeedÂ
ing length of pipe which is fitted into it. Each length of pipe, except the
first, is bevelled on the outer circumference of the upper end to a distance
of seven digits and for a depth of three digits, in order that it may be inserted
into the length of pipe which goes before it; each, except the last, is reamed
out on the inside of the lower end to a like distance, but to the depth
the first is made as follows: A cave is dug under the surface of earth or in a
tunnel, and timbered on all sides by stout posts and planks, to prevent either
the men from being crushed or the machine from being broken by its collapse.
In this cave, thus timbered, is placed a water-wheel fitted to an angular axle.
The iron journals of the axle revolve in iron pillows, which are held in timbers
of sufficient strength. The wheel is generally twenty-four feet high,
occasionally thirty, and in no way different from those which are made for
grinding corn, except that it is a little narrower. The axle has on one side
a drum with a groove in the middle of its circumference, to which are fixed
many four-curved iron clamps. In these clamps catch the links of the chain,
which is drawn through the pipes out of the sump, and which again falls,
through a timbered opening, right down to the bottom into the sump to a
balancing drum. There is an iron band around the small axle of the
balancing drum, each journal of which revolves in an iron bearing fixed to a
timber. The chain turning about this drum brings up the water by the
balls through the pipes. Each length of pipe is encircled and protected by
five iron bands, a palm wide and a digit thick, placed at equal distances from
each other; the first band on the pipe is shared in common with the
preceding length of pipe into which it is fitted, the last band with the succeedÂ
ing length of pipe which is fitted into it. Each length of pipe, except the
first, is bevelled on the outer circumference of the upper end to a distance
of seven digits and for a depth of three digits, in order that it may be inserted
into the length of pipe which goes before it; each, except the last, is reamed
out on the inside of the lower end to a like distance, but to the depth