DelMonte, Guidubaldo
,
Mechanicorvm Liber
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ſed ne minimum quidem eſſe, cum reperiri non poſsit, hoc mo
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do demonſtrare nituntur.
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<
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lb
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à punctiſquè DE hori
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zonti
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abbr
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perpẽdiculares
">perpendiculares</
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du
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cãtur
">cantur</
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DHEK, atq; alius
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lb
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ſit circulus LDM, cu
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ius
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expan
abbr
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centrũ
">centrum</
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N, qui FDG
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in puncto D contingat,
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ipſiq; FDG ſit æqualis:
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erit NC recta linea. </
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quoniam angulus KEC
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lb
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angulo HDN eſt æqua
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note17
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lis, angulusq; CEG an
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gulo NDM eſt etiam
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lb
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æqualis; cum à ſemidiametris, æqualibusq; circumferentiis conti
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lb
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neatur; erit reliquus mixtuſquè angulus KEG reliquo mixtoquè
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HDM æqualis. </
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">& quia ſupponunt, quò minor eſt angulus linea
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horizonti perpendiculari, & circumferentia contentus, eò pondus
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lb
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in eo ſitu grauius eſſe. </
s
>
<
s
id
="
id.2.1.11.2.1.5.0
">vt quò minor eſt angulus HD, & circumfe
<
lb
/>
rentia DG contentus angulo KEG, hoc eſt angulo HDM; ita ſe
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lb
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cundum hanc proportionem pondus in D grauius eſſe pondere in
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E. </
s
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<
s
id
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id.2.1.11.2.1.5.0.a
">Proportio autem anguli MDH ad angulum HDG minor eſt
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lb
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qualibet proportione, quæ ſit inter maiorem, & minorem quanti
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lb
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tatem: ergo proportio ponderum DE omnium proportionum mi
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nima erit. </
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>
<
s
id
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id.2.1.11.2.1.6.0
">immo neq; erit ferè proportio, cum ſit omnium pro
<
lb
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portionum minima. </
s
>
<
s
id
="
id.2.1.11.2.1.7.0
">quòd autem proportio MDH ad HDG ſit
<
lb
/>
omnium minima, ex hac neceſsitate oſtendunt; quia MDH exce
<
lb
/>
dit HDG angulo curuilineo MDG, qui quidem angulus omnium
<
lb
/>
angulorum rectilineorum minimus exiſtit: ergo cum non poſsit da
<
lb
/>
ri angulus minor MDG, erit proportio MDH ad HDG
<
expan
abbr
="
omniũ
">omnium</
expan
>
<
lb
/>
proportionum minima. </
s
>
<
s
id
="
id.2.1.11.2.1.8.0
">quæ ratio inutilis valde videtur eſſe; quia
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quamquam angulus MDG ſit omnibus rectilineis angulis minor,
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non idcirco ſequitur, abſolutè, ſimpliciterq; omnium eſſe
<
expan
abbr
="
angulorũ
">angulorum</
expan
>
<
lb
/>
minimum: nam ducatur à puncto D linea DO ipſi NC perpendicu
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lb
/>
laris, hæc vtraſq; tanget circumferentias LDM FDG in puncto
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arrow.to.target
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note18
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