Agricola, Georgius, De re metallica, 1912/1950

Table of figures

< >
[Figure 261]
Page: 531
[Figure 262]
Page: 537
[Figure 263]
Page: 539
[Figure 264]
Page: 542
[Figure 265]
Page: 546
[Figure 266]
Page: 548
[Figure 267]
Page: 552
[Figure 268]
Page: 555
[Figure 269]
Page: 557
[Figure 270]
Page: 560
[Figure 271]
Page: 563
[Figure 272]
Page: 565
[Figure 273]
Page: 566
[Figure 274]
Page: 568
[Figure 275]
Page: 570
[Figure 276]
Page: 572
[Figure 277]
Page: 575
[Figure 278]
Page: 581
[Figure 279]
Page: 585
[Figure 280]
Page: 587
[Figure 281]
Page: 589
[Figure 282]
Page: 591
[Figure 283]
Page: 592
[Figure 284]
Page: 593
[Figure 285]
Page: 594
[Figure 286]
Page: 595
[Figure 287]
Page: 597
[Figure 288]
Page: 599
[Figure 289]
Page: 601
[Figure 290]
Page: 605
< >
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="caption">
              <s>
                <pb pagenum="224"/>
              anyone coming at an inopportune moment might disturb his thoughts when
                <lb/>
              they are intent on the work. </s>
              <s>It is also necessary for him to place his balances
                <lb/>
              in a case, so that when he weighs the little buttons of metal the scales may
                <lb/>
              not be agitated by a draught of air, for that is a hindrance to his work.</s>
            </p>
            <p type="main">
              <s>Now I will describe the different things which are necessary in assaying,
                <lb/>
              beginning with the assay furnace, of which one differs from another in
                <lb/>
              shape, material, and the place in which it is set. </s>
              <s>In shape, they may be
                <lb/>
              round or rectangular, the latter shape being more suited to assaying ores.
                <lb/>
              </s>
              <s>The materials of the assay furnaces differ, in that one is made of bricks,
                <lb/>
              another of iron, and certain ones of clay. </s>
              <s>The one of bricks is built on a
                <lb/>
              chimney-hearth which is three and a half feet high; the iron one is placed
                <lb/>
              in the same position, and also the one of clay. </s>
              <s>The brick one is a cubit high,
                <lb/>
              a foot wide on the inside, and one foot two digits long; at a point five digits
                <lb/>
              above the hearth—which is usually the thickness of an unbaked
                <emph type="sup"/>
              2
                <emph.end type="sup"/>
              brick—
                <lb/>
              an iron plate is laid, and smeared over with lute on the upper side to prevent
                <lb/>
              it from being injured by the fire; in front of the furnace above the plate is a
                <lb/>
              mouth a palm high, five digits wide, and rounded at the top. </s>
              <s>The iron plate </s>
            </p>
            <figure number="129"/>
            <p type="caption">
              <s>A—OPENINGS IN THE PLATE. B—PART OF PLATE WHICH PROJECTS BEYOND THE FURNACE.
                <lb/>
              has three openings which are one digit wide and three digits long, one is at
                <lb/>
              each side and the third at the back; through them sometimes the ash falls
                <lb/>
              from the burning charcoal, and sometimes the draught blows through the
                <lb/>
              chamber which is below the iron plate, and stimulates the fire. </s>
              <s>For this
                <lb/>
              reason this furnace when used by metallurgists is named from assaying, but
                <lb/>
              when used by the alchemists it is named from the wind
                <emph type="sup"/>
              3
                <emph.end type="sup"/>
              . </s>
              <s>The part of the
                <lb/>
              iron plate which projects from the furnace is generally three-quarters of a
                <lb/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum