Agricola, Georgius
,
De re metallica
,
1912/1950
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
page
|<
<
of 679
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
pagenum
="
175
"/>
more useful than the first one for drawing water out of shafts, into which
<
lb
/>
much water is continually flowing. </
s
>
<
s
>This machine has no iron frame nor
<
lb
/>
drums, but has around its axle a wooden wheel which is turned by treading;
<
lb
/>
the axle, since it has no drum, does not last very long. </
s
>
<
s
>In other respects
<
lb
/>
this pump resembles the first kind, except that it differs from it by having
<
lb
/>
a double chain. </
s
>
<
s
>Clamps should be fixed to the axle of this machine, just as
<
lb
/>
to the drum of the other one; some of these are made simple and others
<
lb
/>
with triple curves, but each kind has four barbs.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>The third machine, which far excels the two just described, is made
<
lb
/>
when a running stream can be diverted to a mine; the impetus of the
<
lb
/>
stream striking the paddles revolves a water-wheel in place of the wheel
<
lb
/>
turned by treading. </
s
>
<
s
>With regard to the axle, it is like the second machine, </
s
>
</
p
>
<
figure
number
="
98
"/>
<
p
type
="
caption
">
<
s
>A—WHEEL WHOSE PADDLES ARE TURNED BY THE FORCE OF THE STREAM. B—AXLE.
<
lb
/>
C—DRUM OF AXLE, TO WHICH CLAMPS ARE FIXED. D—CHAIN. E—LINK. F—DIPPERS.
<
lb
/>
G—BALANCE DRUM.
<
lb
/>
but the drum which is round the axle, the chain, and the balance drum, are
<
lb
/>
like the first machine. </
s
>
<
s
>It has much more capacious dippers than even the
<
lb
/>
second machine, but since the dippers are frequently broken, miners rarely
<
lb
/>
use these machines; for they prefer to lift out small quantities of water by
<
lb
/>
the first five machines or to draw it up by suction pumps, or, if there is </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>