1more useful than the first one for drawing
water out of shafts, into which
much water is continually flowing. This machine has no iron frame nor
drums, but has around its axle a wooden wheel which is turned by treading;
the axle, since it has no drum, does not last very long. In other respects
this pump resembles the first kind, except that it differs from it by having
a double chain. Clamps should be fixed to the axle of this machine, just as
to the drum of the other one; some of these are made simple and others
with triple curves, but each kind has four barbs.
much water is continually flowing. This machine has no iron frame nor
drums, but has around its axle a wooden wheel which is turned by treading;
the axle, since it has no drum, does not last very long. In other respects
this pump resembles the first kind, except that it differs from it by having
a double chain. Clamps should be fixed to the axle of this machine, just as
to the drum of the other one; some of these are made simple and others
with triple curves, but each kind has four barbs.
The third machine, which far excels the two just described, is made
when a running stream can be diverted to a mine; the impetus of the
stream striking the paddles revolves a water-wheel in place of the wheel
turned by treading. With regard to the axle, it is like the second machine,
when a running stream can be diverted to a mine; the impetus of the
stream striking the paddles revolves a water-wheel in place of the wheel
turned by treading. With regard to the axle, it is like the second machine,
A—WHEEL WHOSE PADDLES ARE TURNED BY THE FORCE OF THE STREAM.
B—AXLE.
C—DRUM OF AXLE, TO WHICH CLAMPS ARE FIXED. D—CHAIN. E—LINK. F—DIPPERS.
G—BALANCE DRUM.
but the drum which is round the axle, the chain, and the balance drum, are
like the first machine. It has much more capacious dippers than even the
second machine, but since the dippers are frequently broken, miners rarely
use these machines; for they prefer to lift out small quantities of water by
the first five machines or to draw it up by suction pumps, or, if there is
C—DRUM OF AXLE, TO WHICH CLAMPS ARE FIXED. D—CHAIN. E—LINK. F—DIPPERS.
G—BALANCE DRUM.
but the drum which is round the axle, the chain, and the balance drum, are
like the first machine. It has much more capacious dippers than even the
second machine, but since the dippers are frequently broken, miners rarely
use these machines; for they prefer to lift out small quantities of water by
the first five machines or to draw it up by suction pumps, or, if there is