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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EPISTOLAE.
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nem planià meridiano, & non à dicto verticali.</
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<
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">Con ſidera primum in Munſtero cap .16. ſuæ horologiographiæ, vbi clarè docet
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accipere angulum compræhenſum inter meridianum, & planum propoſitum, vbi
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etiam ponit quandam figuram ædificij cum pariete ſuper quo deſignatum eſt quod
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dam horologium, & vbi ſe manifeſtè declarar, ita dicens.</
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">Nam ipſarum partium complementum. propoſitum indicabit angulum, quan-
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tus videlicet fuerit arcus eiuſdem circuli
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à puncto
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vſque ad productam li-
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neam meridianam interceptus, qui vnà cum ipſo
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quadrantem integrare videtur,
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vt in ſequenti figura: </
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<
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eſt ſexaginta partium, qualium
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f
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.
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nonaginta, vnde concluditur reliquam partem hoc eſt, datum inclinationis
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angulum
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,
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fore partium triginta ſimilium.</
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<
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">Orontius verò cap .13.
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vtitur verbis, cum figura ſimili ad reliqua autem ipſius
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R. Clauij, videnda nondum mihi otium fuit. </
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<
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">quod ſi dabitur, tibi libenter
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dicam
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quid ſentiam.</
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">DE MODO DVCENDI LINEAS HORARIAS
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ſuper cyllindro immobili.</
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">Hieronymo Ferrerio artium & Medicina Doctori peritißimo.</
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<
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horarias lineas ſuper cyllindro immobili, ad orizontemq́ue
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perpendiculariter erecto difficile tibi non erit, (quod à me poſtulaſti) ſi
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modum .53. cap. meæ gnomonicæ obſeruaueris, accipiendo tamen pro
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linea orizontali in tabula non aliquam rectam lineam, ſed circularem,
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ſimilemque circunferentiæ ipſius cyllindri, dico autem ſimilem, eo quod ſi gn o-
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mon
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ſupra tabulam ſignatus, & perpendicularis ipſi orizontali circulari
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>.b.i.x.</
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>
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eſſet dimidia, vel tertia vel quarta pars gnomonis cyllindro infixi, oporteret, vt
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ſemidiameter circuli
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etiam
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eſſet medietas, vel tertia, aut quar
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ta pars ſemidiametri cyllindri, vt
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omnes arcus huiuſmodi circuli in
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ter ipſos azimut intercepti ſimiles
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ſint arcubus cyllindri, quod à
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te ipſo facilè videre ſcientificè po
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teris. </
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">reliqua nihil mutanda erunt
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ab eo, quod ſcripſi circa figuram
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53.</
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cap. vt dixi. </
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cum fuerit diſtantia orizontalis
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puncti
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à pede gnomonis
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>.x.</
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nec
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non quantitas azi mutalis muralis
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<
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>b.t.</
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quæ ſemper ab orizontali per
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pendiculariter deſcendit, illicò
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punctum
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var
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horæ propoſitæ in cy-
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lindro inuenietur.</
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