Heron Alexandrinus, Mechanica, 1999

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    <archimedes>
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            <pb n="2">
              <s id="A18-1.02.01">2. On the wheels.</s>
              <s id="A18-1.02.02">The wheels attached to an axle always move in one direction, namely the direction in which the axle moves.</s>
              <s id="A18-1.02.03">The wheels that are resting on two axles and whose cogs mesh with each others', move in two different directions, so that the one goes to the right, the other to the left.</s>
              <s id="A18-1.02.04">If both wheels are equal, the rotation of the one to the right entirely corresponds to the rotation of the other to the left; if they are, however, unequal, so that one is larger than the other, the smaller one rotates more often, until the larger one rotates once, according to their sizes.</s>
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    </archimedes>
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