Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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DP, ita GH ad DI; erit
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GH maior quam DI, Dico GK
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ad GH maiorem rationem habere, quàm DL ad DI. </
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<
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>Quia
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enim HK eſt æqualis IL, erit per lemma 2. maior ratio GK ad
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DL, quàm GH ad DI: & permutando GK ad GH, quàm DL
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ad DI. </
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<
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>Eſt autem ut GK ad GH, & DL ad DI, ita motus in
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clinati ad motum verticalem per theorem: 8. </
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<
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>Igitur motus
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quadrati AEFC eſt velocior motu trianguli ABC in eodem
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plano inclinato AN. </
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THEOREMA XVI.
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Figura rectilinea & æqualis, quæ plura habet latera, minùs gra
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uitat in eodem plano inclinato.
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>Nam ſemidiameter figuræ motús, hoc eſt grauitas tota, ſeca
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tur ab hypomochlio in eam, quæ mouet, & in eam quæ in hy
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pomochlio quieſcit, per theorema 9. </
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>Eſt autem maior grauitas
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mouens in figurâ plurilaterâ per theor. 15. minor ergo huius
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pars quieſcit; ac proinde minùs grauitat. </
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THEOREMA XVII.
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Grauitas eiuſdem parallelogrammi mutato ſitu inæqualiter mouet,
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& grauitat in eodem plano inclinato.
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<
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>Moueatur in plano BO
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parallelogrãmum
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ABCD: Dico
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ex mutato laterum ſitu inæqualiter moveri: velociùs quidem,
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ſi minus latus CD, tardiùs verò ſi maius latus BD fiat paralle
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lum eidem plano BO. </
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Educãtur
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ex angulis CD lineæ hypomo
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chlij CG. DM: & ex centro figuræ E ſemidiametri figuræ motûs
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EF. EK. </
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<
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>Et quia in duobus triangulis ſimilibus MBD. GDC
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maior eſt DB quàm CD; erit
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BM maior quàm DG. </
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<
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>Et </
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