DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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<
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<
chap
id
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N13F6F
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<
pb
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98
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xlink:href
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036/01/209.jpg
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id.2.1.197.4.0.0.0
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<
s
id
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id.2.1.197.4.1.1.0
">Motus vectium fit hoc modo, vectis YZ, cùm funis ſit religatus
<
lb
/>
in E, habet fulcimentum in Y, pondus in B medio appenſum, &
<
lb
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potentia in Z. </
s
>
<
s
id
="
N15C48
">& vectis PQ habet fulcimentum in P potentia in
<
lb
/>
medio, & pondus in q. </
s
>
<
s
id
="
N15C4C
">oportet enim orbiculos, quorum cen
<
lb
/>
tra ſunt BD in eandem partem moueri, videlicet vt QZ ſur
<
lb
/>
ſum moueantur. </
s
>
<
s
id
="
id.2.1.197.4.1.2.0
">& quoniam funis religatus eſt in L, erit T fulci
<
lb
/>
mentum vectis ST, qui pondus habet in medio, & potentia in
<
lb
/>
S. </
s
>
<
s
id
="
N15C59
">& quia S mouetur ſurſum, neceſſe eſt etiam R ſurſum moue
<
lb
/>
ri; & ideo F erit fulcimentum vectis FR, & pondus erit in R,
<
lb
/>
& potentia in medio. </
s
>
<
s
id
="
id.2.1.197.4.1.3.0
">orbiculi igitur, quorum centra ſunt H k,
<
lb
/>
in contrariam mouentur partem eorum, quorum centra ſunt BD:
<
lb
/>
quare partes
<
expan
abbr
="
orbiculorũ
">orbiculorum</
expan
>
PF in orbiculis deorſum
<
expan
abbr
="
tendẽt
">tendent</
expan
>
; videlicet
<
lb
/>
verſus XV. </
s
>
<
s
id
="
id.2.1.197.4.1.3.0.a
">vectis igitur VX in neutram partem mouebitur, cùm
<
lb
/>
P, & F deorſum moueantur; & VX erit tanquam vectis, in cuius
<
lb
/>
medio erit pondus appenſum, & in VX duæ potentiæ æquales
<
lb
/>
ſextæ parti ponderis C. </
s
>
<
s
id
="
N15C79
">potentiæ enim in MO hoc eſt funes PV
<
lb
/>
FX ſextam ſuſtinent partem ponderis C. </
s
>
<
s
id
="
N15C7D
">totus igitur orbiculus,
<
lb
/>
cuius centrum A ſurſum vnà cum trochlea mouebitur; non au
<
lb
/>
tem circumuertetur. </
s
>
</
p
>
<
p
id
="
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type
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head
">
<
s
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">PROPOSITIO XXV. </
s
>
</
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<
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<
s
id
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id.2.1.197.6.1.1.0
">Si tribus duarum trochlearum orbiculis,
<
lb
/>
quarum altera binis inſignita rotulis à potentia
<
lb
/>
ſupernè detineatur; altera verò vnius tantùm
<
lb
/>
rotulæ infernè
<
expan
abbr
="
cõſtituta
">conſtituta</
expan
>
, ac ponderi alligata fue
<
lb
/>
rit, circumuoluatur funis; vtroq; eius extremo
<
lb
/>
alicuibi, non autem inferiori trochleæ religa
<
lb
/>
to: dupla erit ponderis potentia. </
s
>
</
p
>
</
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>
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