Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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eorum g quadrata inuicem habebunt. </
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<
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xml:space
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g
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xml:space
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">_Cor. 1._
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_11.l.3._</
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ad planarum, ac ſolidarum figurarum quoq; </
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<
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reſpicerem, ſimilemque varietatem nactus eſſem, adhuc auge-
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batur admiratio; </
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<
s
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">in cono enim centrum grauitatis eſt in axe per
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xml:space
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">_Luc. Val_
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_39 l.1_</
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quartam partem diſtant à baſi, in triangulo verò ipſum gignen-
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<
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i
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xml:space
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">_Idem 19._
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_l.1._</
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te eſt in eodem axæ, dictans ab eadem per tertiam partem eiuſ-
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dem axis. </
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<
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">Similiter in conoide parabolico illiud ect in axe per
<
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<
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k
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xml:space
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">_Idë 41._
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_l.2._</
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tertiam partem diſtans à baſi, in parabola verò ipſum generante
<
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<
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l
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">_Arch. 8._
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_Se. ęquep_</
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per duas tertias eiuſdem axis remouetur ab ipſabaſi. </
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<
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go talem varietatem in plurimis alijs ſiguris ſæpius, ac ſæpè fuiſsẽ
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meditatus, vbi prius ex. </
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<
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<
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">cylindrum ex indefinitis numero pa-
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rallelogrammis, conum verò in eadem baſi, & </
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<
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">circa eundẽ axim
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cum cylindro conſtitutum, ex indefinitis numero triangulis per
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axem tranſeuntibus veluti compactum effingens, habita dictorũ
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planorum mutua ratione, illicò & </
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<
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">ipſorum ſolidor um ab ipſis ge-
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nitorum emergere rationem exiſtimabam, cum iam planè conſta-
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ret planorum rationi genitorum ab ijſdem ſolidorum rationem
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minimè concordare, figurarum menſuram tali ratione inquiren-
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temoleum, & </
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<
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">operam perdere, ac ex inanibus paleis trituram fa-
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cturum eſſe, mihi iure cenſendum videbatur. </
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<
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fundius rem contemplatus in hanc tandem deueni ſententiam,
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nempè ad rem noſtram lineas, & </
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<
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">plana, non ad inuicem coinci-
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dentia, ſed æquidiſtantia aſſumenda eſſe; </
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<
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">ſic enim in plurimis ra-
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tione inueſtigata reperij tum corporum proportioni ipſorum plano-
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rum, tum planorum proportiom ipſarum linearum proportionem
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(ſi eo modo ſumantur, quo lib. </
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<
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<
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">explicatur) ad amuſſim in
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">_Def. I._
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_& 2.l.2._</
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omnibus reſpondere. </
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non amplius per axem ſed æquidiſt anter baſiceu ſectos cõtempla-
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tus, eandem ſanè rationem habere illa comperij, quæ lib. </
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<
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omnia plana cylindri ad omnia plana coni, regula communi
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xml:space
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">_Def. 1. &_
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_2.l.2._</
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baſi (nempè circulorum congeriem, quæ intra cylindrũ, & </
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veluti vefligia plani à b aſi ad oppoſitam baſim continuò illi æqui-
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">_Def. 1. &_
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_2.l.2._</
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diſtanter fluentis quodammodo relinqui intelliguntur) ei, quam
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babet cylindrus ad conum. </
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<
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">Optimam ergo methodum figurarum
<
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ſcrutanda menſuræ indicaui prius line arum pro planis, & </
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<
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rum pro ſolidis rationes indagare, vt illicò ipſarum </
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