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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若重在地平之下,則從垂線為o到
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f,[f]i與ai長,所用前款,力在于g,
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故力多。</
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<
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">第四十二款 揭槓在平,重心在上。</
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力愈少。</
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<
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"> 如上圖。</
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">重心起高,垂線到a。</
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">視下平
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重,去支磯愈近,故用力愈少也。</
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