Agricola, Georgius
,
De re metallica
,
1912/1950
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Thumbnails
List of thumbnails
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 679
>
131
132
133
134
135
136
137
138
139
140
<
1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 400
401 - 410
411 - 420
421 - 430
431 - 440
441 - 450
451 - 460
461 - 470
471 - 480
481 - 490
491 - 500
501 - 510
511 - 520
521 - 530
531 - 540
541 - 550
551 - 560
561 - 570
571 - 580
581 - 590
591 - 600
601 - 610
611 - 620
621 - 630
631 - 640
641 - 650
651 - 660
661 - 670
671 - 679
>
page
|<
<
of 679
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
p
type
="
main
">
<
s
>
<
pb
pagenum
="
227
"/>
hearth, for it does not project beyond the wall. </
s
>
<
s
>The hide of the bellows is
<
lb
/>
fixed to the bellows-boards with its own peculiar kind of iron nails. </
s
>
<
s
>It joins
<
lb
/>
both bellows-boards to the head, and over it there are cross strips of
<
lb
/>
hide fixed to the bellows-boards with broad-headed nails, and similarly
<
lb
/>
fixed to the head. </
s
>
<
s
>The middle board of the bellows rests on an iron bar,
<
lb
/>
to which it is fastened with iron nails clinched on both ends, so that it cannot
<
lb
/>
move; the iron bar is fixed between two upright posts, through which it
<
lb
/>
penetrates. </
s
>
<
s
>Higher up on these upright posts there is a wooden axle, with
<
lb
/>
iron journals which revolve in the holes in the posts. </
s
>
<
s
>In the middle of
<
lb
/>
this axle there is mortised a lever, fixed with iron nails to prevent it from
<
lb
/>
flying out; the lever is five and a half feet long, and its posterior end is
<
lb
/>
engaged in the iron ring of an iron rod which reaches to the “tail” of the
<
lb
/>
lowest bellows-board, and there engages another similar ring. </
s
>
<
s
>And so when
<
lb
/>
the workman pulls down the lever, the lower part of the bellows is raised and
<
lb
/>
drives the wind into the nozzle; then the wind, penetrating through the hole
<
lb
/>
in the middle bellows-board, which is called the air-hole, lifts up the upper
<
lb
/>
part of the bellows, upon whose upper board is a piece of lead, heavy enough
<
lb
/>
to press down that part of the bellows again, and this being pressed down
<
lb
/>
blows a blast through the nozzle. </
s
>
<
s
>This is the principle of the double bellows,
<
lb
/>
which is peculiar to the iron hoop where are placed the triangular crucibles in
<
lb
/>
which copper ore is smelted and copper is melted.</
s
>
</
p
>
<
figure
number
="
130
"/>
<
p
type
="
caption
">
<
s
>A—IRON HOOP. B—DOUBLE BELLOWS. C—ITS NOZZLE. D—LEVER.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>I have spoken of the furnaces and the iron hoop; I will now speak of
<
lb
/>
the muffles and the crucibles. </
s
>
<
s
>The muffle is made of clay, in the shape
<
lb
/>
of an inverted gutter tile; it covers the scorifiers, lest coal dust fall into
<
lb
/>
them and interfere with the assay. </
s
>
<
s
>It is a palm and a half broad, and the
<
lb
/>
height, which corresponds with the mouth of the furnace, is generally a palm, </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>