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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<
chap
id
="
N10D00
"
n
="
2
">
<
pb
xlink:href
="
X03/01/229.jpg
"/>
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/>
<
p
type
="
head
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<
s
id
="
N12940
">第八十六款 藤線用力最省,其費時必相反。</
s
>
<
s
id
="
N12943
">
<
lb
/>
藤線之弦二倍于股,用力一半足矣,
<
lb
/>
但費時必二倍于垂線。</
s
>
<
s
id
="
N12949
">如上圖,用力
<
lb
/>
在o,一垂重至u,一重斜至a。</
s
>
<
s
id
="
N1294E
">一時
<
lb
/>
用力,u重到o,a重止可到p。</
s
>
<
s
id
="
N12953
">再費一
<
lb
/>
時,方得到o。</
s
>
<
s
id
="
N12958
">然a重用力止可二斤,
<
lb
/>
u重則須用力四斤。</
s
>
<
s
id
="
N1295D
">所以用力一半
<
lb
/>
者,路必二倍,故費時與省力相反也。</
s
>
<
s
id
="
N12962
"/>
</
p
>
<
p
type
="
head
">
<
s
id
="
N12967
">第八十七款 藤線器之料有三:鋼一,木一,銅一,</
s
>
</
p
>
</
chap
>
</
body
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</
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