Heron Alexandrinus, Mechanica, 1999

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    <archimedes>
      <text>
        <body>
          <chap n="2">
            <pb n="6">
              <s id="A18-2.06.01">6 If the screw is used by itself, it happens in this way.</s>
              <s id="A18-2.06.02">If one uses it however differently, in connection with another power, namely the one effective through the shaft with the fitted wheel, it happens in the following way.</s>
              <s id="A18-2.06.03">Let us assume cogs on the wheel on the shaft, while a screw stands opposite the wheel, either perpendicular to the ground or parallel to the plane of the ground.</s>
              <s id="A18-2.06.04">The cogs are to mesh with the screw thread and the ends of the screw lie in two round holes in two firm supports, as described before.</s>
              <s id="A18-2.06.05">Let there be at the one end of the screw a protrusion jutting out from the firm support, to which is attached a quadrangle with holds, or we drill holes into this jutting protrusion in order to fasten spokes in them, with which we turn the screw.</s>
              <s id="A18-2.06.06">If we want to lift any load with this tool, we tie the ropes that are fastened to the load to the shaft on both sides of the wheel.</s>
              <s id="A18-2.06.07">Then we turn the screw that we had the cogs of the wheel mesh with, then the wheel will rotate with the shaft and that load will rise.</s>
            </pb>
          </chap>
        </body>
      </text>
    </archimedes>
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