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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<
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N10015
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1
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X03/01/118.jpg
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<
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N113A3
"> 第二十二款 有體求其重心。</
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N113A6
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<
s
id
="
N113AB
"> 假如上無法之面,欲求重心。</
s
>
<
s
id
="
N113AE
">先於上
<
lb
/>
作平線繫a。</
s
>
<
s
id
="
N113B3
"> 次於e垂一直線緊靠
<
lb
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一邊,又次於i亦作一垂線緊靠一
<
lb
/>
邊。</
s
>
<
s
id
="
N113BA
">即從a上往下,以墨直點作線。</
s
>
<
s
id
="
N113BD
">e
<
lb
/>
至o,i至u兩線,是徑之面。</
s
>
<
s
id
="
N113C2
">復轉繫
<
lb
/>
體,再如e o、i u,作兩線如前,就得
<
lb
/>
第二徑之面。</
s
>
<
s
id
="
N113C9
">即向上端下端看兩線,
<
lb
/>
十字交處,即得重之徑也。</
s
>
<
s
id
="
N113CE
">又將繫體
<
lb
/>
橫轉,從c處繫於a上,求徑線至ch,
<
lb
/>
亦向十字交處看之,則得k,是重心也。</
s
>
<
s
id
="
N113D5
"/>
</
p
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</
chap
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</
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</
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