Terentius, Johannes; Zheng, Wang 王徴, Yuan xi qi qi tu shuo lu zui 遠西奇器圖說錄最, [1830]

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    <archimedes>
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          <chap id="N10015" n="1">
            <pb xlink:href="X03/01/109.jpg"/>
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            <p type="head">
              <s id="N1121F"> ​第​十​款 ​有​重​線​過​地​心，​交​於​地​平，​作​兩​直​角
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              ​者​為​重​之​垂​徑​。</s>
              <s id="N11224"/>
            </p>
            <p type="main">
              <s id="N11229"> ​假​如​上​圖​。</s>
              <s id="N1122C">​圓​為​地​球，​中​有​地​心，​橫​有
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              ​地​平​線​。</s>
              <s id="N11231">​上​有​方​重，​其​線​過​地​心，​交​於
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              ​地​平​線，​作​兩​直​角​。</s>
              <s id="N11236">​故​其​立​線​為​重​之
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              ​垂​徑​也​。</s>
              <s id="N1123B"/>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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