Agricola, Georgius, De re metallica, 1912/1950

Table of figures

< >
[Figure 91]
Page: 203
[Figure 92]
Page: 205
[Figure 93]
Page: 206
[Figure 94]
Page: 208
[Figure 95]
Page: 209
[Figure 96]
Page: 211
[Figure 97]
Page: 212
[Figure 98]
Page: 213
[Figure 99]
Page: 215
[Figure 100]
Page: 216
[Figure 101]
Page: 217
[Figure 102]
Page: 218
[Figure 103]
Page: 220
[Figure 104]
Page: 221
[Figure 105]
Page: 223
[Figure 106]
Page: 225
[Figure 107]
Page: 227
[Figure 108]
Page: 229
[Figure 109]
Page: 231
[Figure 110]
Page: 232
[Figure 111]
Page: 233
[Figure 112]
Page: 235
[Figure 113]
Page: 237
[Figure 114]
Page: 239
[Figure 115]
Page: 240
[Figure 116]
Page: 241
[Figure 117]
Page: 242
[Figure 118]
Page: 243
[Figure 119]
Page: 244
[Figure 120]
Page: 245
< >
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="56"/>
            <p type="main">
              <s>Others, on the contrary, run from north to south.</s>
            </p>
            <figure number="18"/>
            <p type="caption">
              <s>A, B, C—VEIN. D, E, F—
                <emph type="italics"/>
              Seams in the Rocks.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>The seams in the rocks indicate to us whether a vein runs from the
                <lb/>
              east or from the west. </s>
              <s>For instance, if the rock seams incline toward the
                <lb/>
              westward as they descend into the earth, the vein is said to run from east
                <lb/>
              to west; if they incline toward the east, the vein is said to run from west
                <lb/>
              to east; in a similar manner, we determine from the rock seams whether
                <lb/>
              the veins run north or south.</s>
            </p>
            <p type="main">
              <s>Now miners divide each quarter of the earth into six divisions; and by
                <lb/>
              this method they apportion the earth into twenty-four directions, which they
                <lb/>
              divide into two parts of twelve each. </s>
              <s>The instrument which indicates these
                <lb/>
              directions is thus constructed. </s>
              <s>First a circle is made; then at equal
                <lb/>
              intervals on one half portion of it right through to the other, twelve
                <lb/>
              straight lines called by the Greeks
                <foreign lang="grc">διάμετροι,</foreign>
              and in the Latin
                <emph type="italics"/>
              dímetíentes,
                <emph.end type="italics"/>
                <lb/>
              are drawn through a central point which the Greeks call
                <foreign lang="grc">κέντρον,</foreign>
              so that
                <lb/>
              the circle is thus divided into twenty-four divisions, all being of an equal
                <lb/>
              size. </s>
              <s>Then, within the circle are inscribed three other circles, the outer­
                <lb/>
              most of which has cross-lines dividing it into twenty-four equal parts; the
                <lb/>
              space between it and the next circle contains two sets of twelve numbers,
                <lb/>
              inscribed on the lines called “diameters”; while within the innermost circle
                <lb/>
              it is hollowed out to contain a magnetic needle
                <emph type="sup"/>
              3
                <emph.end type="sup"/>
              . </s>
              <s>The needle lies directly </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum