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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力幾何?</
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<
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N122E0
"> 假如ch重為二千斤,其心為i;槓杆
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兩端為o、c,其體重四百斤,其重心
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在g。</
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<
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id
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N122E7
">槓杆斜起在支磯e上,ae是
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其定所。</
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<
s
id
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N122EC
">重徑為ik,kg為六分,f
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c為十二分。</
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<
s
id
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N122F1
">c用能力宜幾何?法曰:
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先求重物與槓體之重心。</
s
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<
s
id
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N122F6
">用比例法:
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lb
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</
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</
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<
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">一 二千四百斤 為重與槓兩重之數
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</
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</
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<
s
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">二 四百斤 為槓重之數
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</
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N1230E
">三 六分 為從k重心到g重心之數
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</
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<
s
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N12316
">四 一分 為從k到u之分數。</
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<
s
id
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N12319
">所以ug為五分
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</
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<
s
id
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N12321
">再用比例法:</
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</
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