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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              <s id="N12554"> ​假​如​不​用​輪​法,​欲​起​千​斤​之​重,​其​費
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              ​時​止​一​刻​耳​。</s>
              <s id="N12559"> ​若​用​此​輪​法,​則​費​時​當
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              ​須​四​刻​。</s>
              <s id="N1255E">​蓋​用​力​則​省,​而​為​時​則​多​也​。</s>
              <s id="N12561">
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              <s id="N12568">​第​六​十​三​款 ​有​重​有​力,​欲​用​輪​起​。</s>
              <s id="N1256B">​求​輪​法​。</s>
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            <p type="main">
              <s id="N12573"> ​有​重​為​六​十​斤,​能​力​十​斤​。</s>
              <s id="N12576">​用ae​直
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              ​線​為​軸​與​輪​兩​半​徑​。</s>
              <s id="N1257B">​用​比​例​法:
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            <p type="main">
              <s id="N12583">​一 ​六​十​斤 ​為​重​與​力​之​總​數
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              </s>
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            <p type="main">
              <s id="N1258B">​二 ​十​斤 ​為​力​之​數
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            <p type="main">
              <s id="N12593">​三 ​十​四​分 ​為ae​直​線​之​分​數
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              </s>
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            <p type="main">
              <s id="N1259B">​四 ​二​分 ​為ec​之​分​數,​即​得​軸​之​半​徑,​所​以ca​十
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              </s>
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            <p type="main">
              <s id="N125A3"> ​二​分​為​輪​之​半​徑​也​。</s>
              <s id="N125A6">​依​賴​前​五​十​八​款a
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              </s>
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            <p type="main">
              <s id="N125AE"> ​力​準​等​于e​係​重,​故​得​此​法​。</s>
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