Benedetti, Giovanni Battista de
,
Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]
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[Item 6.50.]
Page: 428 (416)
[Item 6.51.]
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Page: 437 (425)
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xml:space
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OPERATIONVM
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PERSPECTIVAE.</
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<
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cauſas
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operationis perſpectiuæ perſectè docuerit, operæpre-
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cium exiſtimaui
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de ijs diſputationem ſuſcipere.</
s
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<
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<
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xml:space
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">Multi enim
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, qui huiuſmodi operationis regulas
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præſcribunt, cum eius effectuum veras cauſas igno-
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rent, varios
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type
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errores committunt, vt exempli
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gratia in ſubſcripta figura ſuperficiali
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>.A.</
var
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volentes degra
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dare (vt dicunt) rectangulum
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>.q.a.</
var
>
in triangulo
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>.i.d.q.</
var
>
du-
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cunt
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parallelam
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type
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ipſi
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à puncto
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>.B.</
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interſecationis lineæ-
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o.l. cum latere
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>.i.d.</
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trianguli, & (idem) indifferenter, ean-
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dem quoque à puncto
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>.Z.</
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interſecationis ipſius
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>
cum perpendiculari
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ducunt.
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">neſcientes hunc ſolum eſſe verum modum, n onitem alium, quia ſi alius, talis eſſet,
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hic, verus non exiſteret, nam ſi vellent ſeſe excuſ are, quòd ducendo dictam paralle-
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/>
lam à puncto
<
var
>.B.</
var
>
hoc fiat præſupponendo planum ipſius
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>.i.d.q.</
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>
verſus rectangulum
<
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>.
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q.a.</
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orizontale inclinatum, ſecundum angulum
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hæc excuſatio accipien-
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da non eſſet, quia horum conſenſu, præſupponendo planum
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inclinatum,
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anguli inferiores rectanguli degradati, non tam acuti, quam ſunt duo
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et
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>.i.q.
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d.</
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eſſe deberent, quod facilè eorum ratione innoteſcet, quæ de figura corporea
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>.
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A.</
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>
hîc ſubſcripta mox proponam, præter id, quòd volentes deinde aſpicere qua-
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dratum degradatum, oporteret huiuſmodi planum reſpectu oculi ita collocare,
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quemadmodum ſe habet linea
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reſpectu
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>
quod factu nimis arduum eſſet.</
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<
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ad
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>
à puncto
<
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>.Z.</
var
>
communi ip-
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ſis
<
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>.o.l.</
var
>
et
<
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>
perpendiculari ipſi
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>
.</
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