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
>
<
pb
pagenum
="
179
"/>
<
figure
number
="
101
"/>
<
p
type
="
caption
">
<
s
>A—POSTS. B—AXLE. C—WOODEN BARS. D—PISTON ROD. E—SHORT PIECE OF WOOD.
<
lb
/>
F—DRAIN. G—THIS MAN IS DIVERTING THE WATER WHICH IS FLOWING OUT OF THE DRAIN,
<
lb
/>
TO PREVENT IT FROM FLOWING INTO THE TRENCHES WHICH ARE BEING DUG.
<
lb
/>
own weight, the piston is pushed in. </
s
>
<
s
>In this way, the water which the pipe
<
lb
/>
contains is drawn through the openings in the disc and emptied by the piston
<
lb
/>
through the spout into the drain. </
s
>
<
s
>There are some who place a hand-bar
<
lb
/>
underneath in place of the short piece of wood. </
s
>
<
s
>This pump, as also the last
<
lb
/>
before described, is less generally used among miners than the others.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>The fourth kind is not a simple pump but a duplex one. </
s
>
<
s
>It is made as
<
lb
/>
follows. </
s
>
<
s
>A rectangular block of beechwood, five feet long, two and a half
<
lb
/>
feet wide, and one and a half feet thick, is cut in two and hollowed out wide
<
lb
/>
and deep enough so that an iron axle with cranks can revolve in it. </
s
>
<
s
>The axle
<
lb
/>
is placed between the two halves of this box, and the first part of the axle,
<
lb
/>
which is in contact with the wood, is round and the straight end forms a
<
lb
/>
journal. </
s
>
<
s
>Then the axle is bent down the depth of a foot and again bent so
<
lb
/>
as to continue straight, and at this point a round piston-rod hangs from it;
<
lb
/>
next it is bent up as far as it was bent down; then it continues a little way
<
lb
/>
straight again, and then it is bent up a foot and again continues straight,
<
lb
/>
at which point a second round piston-rod is hung from it; afterward it </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>