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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EPISTOL AE.
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xml:space
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cum Horologijs artificialibus.</
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Sabaudiæ Ducis Artifici.</
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conſideraui mirabilem pulchritudinem, ſimul cum vtili-
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propter diametrum limbi, minorem duobus palmis, ſeu ſemipede eſſe non oportet
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neinterſtitia horarum iuſtò breuiora ſeu anguſtiora efficiantur, etiam ne interualla
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dentium rotæ indicis nimis anguſta ſint. </
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vt ea omnia efficiantur in limbo diuiſo tantummodo in .12. horas æquales,
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inueni, qui quidem erit, efficiendo vt Tabula (in qua deſignantur cęleſtes domus,
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cum almicantarat, atque azimut) Reti ſubiectæ, mobilis ſit, tardior tamen ipſo Re-
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te cum indice, pro duplo temporis, hoc eſt, quod eo tempore, quo Aranea cum in
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nea ſeu Zodiacus cum indice, ſpacio .24. horarum perfectè circunuoluetur ſupra Ta-
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tem facias dictam tabulam tardiorem duplo temporis Araneæ cum indice, quamuis
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diuerſis modis hoc fieri poſſit, pręſtantiorem tamen iudico, ſi cum Rota indicis,
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Rotam
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vocatur, Latinè
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verò cum primo, cum
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quam ſecundi colini, varijs modis poteris inuenire, quorum primus erit, vt numerus
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ni, quorum vnus erit (dum numerus dentium primi colini par fuerit)
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vero colinum, medietatis
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numeri dentium cuius erit primus. </
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<
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dum oporteret eſſe duorum dentium, vnde motus ſecundę Rotę non eſſet ita conti-
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nuus. </
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colinus, extribus dentibus exiſtat, ſi primus ex .4. repertus fuerit, oportebit prius ex
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regula de tribus, numerum quendam inuenire quo inuento ipſum duplicare, & hunc
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duplicatum numerum conueniet ſecundam Rotam habere, vt ipſa poſſit ab illo co-
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lino
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