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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只用u、o垂線,則不用a、c兩點。</
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後萬法皆然。</
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">第四十一款 能力挑重中心,在地平槓上。</
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高,則用能愈少;若重愈低,則用能力
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愈多。</
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"> 假如ea槓子在i上,地平的;其垂
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線為oa,起重在上,則用能力在e。</
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從垂線o點到u,其u到i短于a
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到i之長,故用四十款之能力少也。</
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