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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
<
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
="
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
>