Agricola, Georgius
,
De re metallica
,
1912/1950
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
Page concordance
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 679
>
Scan
Original
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
601 - 630
631 - 660
661 - 679
>
page
|<
<
of 679
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
pagenum
="
208
"/>
or by a horse or by water-power; if by a man, the lower board of a large bellows is
<
lb
/>
fixed to the timbers above the conduit which projects out of the shaft, and so
<
lb
/>
placed that when the blast is blown through the conduit, its nozzle is
<
lb
/>
set in the conduit. </
s
>
<
s
>When it is desired to suck out heavy or pestilential
<
lb
/>
vapours, the blow-hole of the bellows is fitted all round the mouth of the
<
lb
/>
conduit. </
s
>
<
s
>Fixed to the upper bellows board is a lever which couples
<
lb
/>
with another running downward from a little axle, into which it is
<
lb
/>
mortised so that it may remain immovable; the iron journals of this little
<
lb
/>
axle revolve in openings of upright posts; and so when the workman pulls
<
lb
/>
down the lever the upper board of the bellows is raised, and at the same time
<
lb
/>
the flap of the blow-hole is dragged open by the force of the wind. </
s
>
<
s
>If the
<
lb
/>
nozzle of the bellows is enclosed in the conduit it draws pure air into itself,
<
lb
/>
but if its blow-hole is fitted all round the mouth of the conduit it exhausts
<
lb
/>
the heavy and pestilential vapours out of the conduit and thus from the
<
lb
/>
shaft, even if it is one hundred and twenty feet deep. </
s
>
<
s
>A stone placed on the
<
lb
/>
upper board of the bellows depresses it and then the flap of the blow-hole is </
s
>
</
p
>
<
figure
number
="
121
"/>
<
p
type
="
caption
">
<
s
>A—SMALLER PART OF SHAFT. B—SQUARE CONDUIT. C—BELLOWS. D—LARGER PART
<
lb
/>
OF SHAFT.</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>