Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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<
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<
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pagenum
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209
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closed. </
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<
s
>The bellows, by the first method, blows fresh air into the conduit
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through its nozzle, and by the second method blows out through the nozzle
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the heavy and pestilential vapours which have been collected. </
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<
s
>In this
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latter case fresh air enters through the larger part of the shaft, and the miners
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getting the benefit of it can sustain their toil. </
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<
s
>A certain smaller part of the
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shaft which forms a kind of estuary, requires to be partitioned off from the
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other larger part by uninterrupted lagging, which reaches from the top of the
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shaft to the bottom; through this part the long but narrow conduit reaches
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down nearly to the bottom of the shaft.</
s
>
</
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<
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type
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main
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<
s
>When no shaft has been sunk to such depth as to meet a tunnel driven
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lb
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far into a mountain, these machines should be built in such a manner that
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the workman can move them about. </
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>
<
s
>Close by the drains of the tunnel
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through which the water flows away, wooden pipes should be placed and
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lb
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joined tightly together in such a manner that they can hold the air; these
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lb
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should reach from the mouth of the tunnel to its furthest end. </
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>
<
s
>At the mouth
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of the tunnel the bellows should be so placed that through its nozzle it can
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blow its accumulated blasts into the pipes or the conduit; since one blast </
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>
</
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<
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number
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122
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<
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<
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>A—TUNNEL. B—PIPE. C—NOZZLE OF DOUBLE BELLOWS.</
s
>
</
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</
chap
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</
body
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</
text
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