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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2
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X03/01/207.jpg
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<
s
id
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N124F5
"> 如上圖。</
s
>
<
s
id
="
N124F8
">有ao不平半徑線,其柄在
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lb
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o上,下係重為c,其垂線從o到u,
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lb
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在ai平線上。</
s
>
<
s
id
="
N124FF
">軸之係重三百斤,如
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ch,與力c比例是au與ae比例。</
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<
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id
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N12504
">
<
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因au為三,ae為一,所以三百斤
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用力一百斤也。</
s
>
<
s
id
="
N1250A
">若不用重而用手,則
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在o與在i省力常等。</
s
>
<
s
id
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N1250F
">蓋因攀而斜
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下,其垂線常在輪之周也。</
s
>
<
s
id
="
N12514
">倘必欲用
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lb
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重,則于輪周加一滑車,其重之係索
<
lb
/>
</
s
>
</
p
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