1again turns the toothed wheel of the upper
small axle and thus the drum to
which the clamps are fixed. In this way the chain, together with the empty
dippers, is slowly let down, close to the footwall side of the vein, into the sump
to the bottom of the balance drum, which turns on a little iron axle, both ends
of which are set in a thick iron bearing. The chain is rolled round the drum
and the dippers fill with water; the chain being drawn up close to the hanging
wall side, carries the dippers filled with water above the drum of the upper
axle. Thus there are always three of the dippers inverted and pouring
water into a lip, from which it flows away into the drain of the tunnel. This
machine is less useful, because it cannot be constructed without great expense,
and it carries off but little water and is somewhat slow, as also are other
machines which possess a great number of drums.
which the clamps are fixed. In this way the chain, together with the empty
dippers, is slowly let down, close to the footwall side of the vein, into the sump
to the bottom of the balance drum, which turns on a little iron axle, both ends
of which are set in a thick iron bearing. The chain is rolled round the drum
and the dippers fill with water; the chain being drawn up close to the hanging
wall side, carries the dippers filled with water above the drum of the upper
axle. Thus there are always three of the dippers inverted and pouring
water into a lip, from which it flows away into the drain of the tunnel. This
machine is less useful, because it cannot be constructed without great expense,
and it carries off but little water and is somewhat slow, as also are other
machines which possess a great number of drums.
A—WHEEL WHICH IS TURNED BY TREADING. B—AXLE. C—DOUBLE
CHAIN. D—LINK
OF DOUBLE CHAIN. E—DIPPERS. F—SIMPLE CLAMPS. G—CLAMP WITH TRIPLE CURVES.
OF DOUBLE CHAIN. E—DIPPERS. F—SIMPLE CLAMPS. G—CLAMP WITH TRIPLE CURVES.
The next machine of this kind, described in a few words by Vitruvius,14
more rapidly brings up dippers, holding a congius; for this reason, it is
more rapidly brings up dippers, holding a congius; for this reason, it is
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