Agricola, Georgius
,
De re metallica
,
1912/1950
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451 - 480
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<
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pagenum
="
179
"/>
<
figure
number
="
101
"/>
<
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type
="
caption
">
<
s
>A—POSTS. B—AXLE. C—WOODEN BARS. D—PISTON ROD. E—SHORT PIECE OF WOOD.
<
lb
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F—DRAIN. G—THIS MAN IS DIVERTING THE WATER WHICH IS FLOWING OUT OF THE DRAIN,
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TO PREVENT IT FROM FLOWING INTO THE TRENCHES WHICH ARE BEING DUG.
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own weight, the piston is pushed in. </
s
>
<
s
>In this way, the water which the pipe
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contains is drawn through the openings in the disc and emptied by the piston
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through the spout into the drain. </
s
>
<
s
>There are some who place a hand-bar
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lb
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underneath in place of the short piece of wood. </
s
>
<
s
>This pump, as also the last
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lb
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before described, is less generally used among miners than the others.</
s
>
</
p
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<
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type
="
main
">
<
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>The fourth kind is not a simple pump but a duplex one. </
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>
<
s
>It is made as
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lb
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follows. </
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>
<
s
>A rectangular block of beechwood, five feet long, two and a half
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lb
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feet wide, and one and a half feet thick, is cut in two and hollowed out wide
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lb
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and deep enough so that an iron axle with cranks can revolve in it. </
s
>
<
s
>The axle
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lb
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is placed between the two halves of this box, and the first part of the axle,
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which is in contact with the wood, is round and the straight end forms a
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journal. </
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>
<
s
>Then the axle is bent down the depth of a foot and again bent so
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lb
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as to continue straight, and at this point a round piston-rod hangs from it;
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lb
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next it is bent up as far as it was bent down; then it continues a little way
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lb
/>
straight again, and then it is bent up a foot and again continues straight,
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at which point a second round piston-rod is hung from it; afterward it </
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>
</
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</
chap
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</
body
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</
text
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</
archimedes
>