Agricola, Georgius, De re metallica, 1912/1950

Table of figures

< >
[Figure 191]
Page: 372
[Figure 192]
Page: 373
[Figure 193]
Page: 374
[Figure 194]
Page: 375
[Figure 195]
Page: 376
[Figure 196]
Page: 378
[Figure 197]
Page: 379
[Figure 198]
Page: 380
[Figure 199]
Page: 381
[Figure 200]
Page: 383
[Figure 201]
Page: 384
[Figure 202]
Page: 385
[Figure 203]
Page: 386
[Figure 204]
Page: 387
[Figure 205]
Page: 388
[Figure 206]
Page: 389
[Figure 207]
Page: 390
[Figure 208]
Page: 395
[Figure 209]
Page: 396
[Figure 210]
Page: 397
[Figure 211]
Page: 399
[Figure 212]
Page: 403
[Figure 213]
Page: 406
[Figure 214]
Page: 408
[Figure 215]
Page: 410
[Figure 216]
Page: 411
[Figure 217]
Page: 412
[Figure 218]
Page: 413
[Figure 219]
Page: 415
[Figure 220]
Page: 421
< >
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="161"/>
              which they unload separately and crush and wash. </s>
              <s>When they draw up
                <lb/>
              buckets of water they empty the water through the hopper into a trough,
                <lb/>
              through which it flows away.</s>
            </p>
            <figure number="88"/>
            <p type="caption">
              <s>A—TIMBER PLACED IN FRONT OF THE SHAFT. B—TIMBER PLACED AT THE BACK OF THE
                <lb/>
              SHAFT. C—POINTED STAKES. D—CROSS-TIMBERS. E—POSTS OR THICK PLANKS.
                <lb/>
              F—IRON SOCKETS. G—BARREL. H—ENDS OF BARREL. I—PIECES OF WOOD.
                <lb/>
              K—HANDLE. L—DRAWING-ROPE. M—ITS HOOK. N—BUCKET. O—BALE OF THE
                <lb/>
              BUCKET.</s>
            </p>
            <p type="main">
              <s>The next kind of machine, which miners employ when the shaft is
                <lb/>
              deeper, differs from the first in that it possesses a wheel as well as cranks.
                <lb/>
              </s>
              <s>This windlass, if the load is not being drawn up from a great depth, is turned
                <lb/>
              by one windlass man, the wheel taking the place of the other man. </s>
              <s>But if the
                <lb/>
              depth is greater, then the windlass is turned by three men, the wheel being
                <lb/>
              substituted for a fourth, because the barrel having been once set in motion,
                <lb/>
              the rapid revolutions of the wheel help, and it can be turned more easily.
                <lb/>
              </s>
              <s>Sometimes masses of lead are hung on to this wheel, or are fastened to the
                <lb/>
              spokes, in order that when it is turned they depress the spokes by their weight
                <lb/>
              and increase the motion; some persons for the same reason fasten into the
                <lb/>
              barrel two, three, or four iron rods, and weight their ends with lumps of lead.
                <lb/>
              </s>
              <s>The windlass wheel differs from the wheel of a carriage and from the one </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum