Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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fortè ſydera rotantur; qui tamen non eſt acceleratus per ſe, propter ra
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tionem prædictam. </
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<
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">Obiiceret fortè aliquis; </
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">eadem ratio quæ probat motum naturalem
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deorſum accelerari, eadem probat circularem naturalem etiam intendi:
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quippè ſemper adeſt principium intrinſecum applicatum. </
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<
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">Reſpondeo
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negandam eſſe paritatem; </
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<
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">quia naturalis motus grauium non accelera
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tur fruſtrà; </
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<
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">Nunquam enim recedit à ſuo fine; </
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<
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">at verò, ſi motus circula
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ris ſyderum acceleraretur, tandem abiret in infinitum, quod reuerâ eſſet
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contra finem à natura inſtitutum; quippè carerent ſuo fine, & vſu corpo
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ra cœleſtia, ſi longè celeriori motu rotarentur. </
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">Obiiceret alius, motus circularis naturalis non acceleraretur, igitur
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tardiſſimus eſſet, qualis reuerâ motus naturalis grauium deorſum, quod
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eſt contra experientiam. </
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<
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">Reſpondeo, vel determinatum impetus gradum,
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eumque valdè intentum produxiſſe iuxta inſtitutum ſuæ naturæ, vel per
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aliquot minuta ſeſe mouiſſe motu recto naturaliter accelerato; ſed de
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hoc motu ſyderum agemus fusè aliquando, cum de cauſis corporum cœ
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leſtium. </
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">Obiicies deſcenſum funependuli, qui eſt naturaliter acceleratus; ſed
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profectò ille motus eſt tantùm per accidens circularis. </
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Scholium.
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<
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">Obſeruabis ex dictis ſatis conſtare, quàm temerè mirentur aliqui tan
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tam motuum cœleſtium celeritatem, cum motus circularis velocitas in
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infinitum augeri poſſit: Obſeruabis præterea, ſi fortè motus rectus corpo
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rum cœleſtium præceſſit per aliquot minuta, motum illum, qui deinde
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ſucceſſit, non eſſe perfectè circularem, ſed mixtum, quem aliquando ex
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plicabimus, & ex eo cauſas Apogæi, Perigæi, declinationis, &c. </
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<
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que anomalias deducemus ſuo loco. </
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Theorema
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21.
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Rota circulo verticali parallela circa axem mobilis addito minimo im
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petu per ſe moueri poteſt
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; </
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<
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">ſit enim ABCD plano verticali parallela circa
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centrum E volubilis; </
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<
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">ſitque in perfecto æquilibrio, & accedat minima
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vis impetus in A v.g. haud dubiè punctum E deſcendet deorſum, alio
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quin maneret æquilibrium, & non maneret: dixi per ſe; </
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<
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">nam cùm non
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poſſit volui circa centrum E, niſi vel cum mobili axe duobus hinc inde
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lunatis fulcris ſuſtentato, vel facto foramine circa axem immobilem, vel
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circa geminos apices conicos immiſſos iuſtis apothecis in plano rotæ
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excauatis, quales videmus in acu magnetica; atqui non poteſt volui rota
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ſiue primo, ſiue ſecundo, ſiue tertio modo voluatur ſine multa compreſ
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ſione partium, id eſt, ſine aliquo affrictu, in quo multæ particulæ vnius
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plani cum particulis alterius quaſi pectinatim commiſſæ, motum & im
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petunt ſiſtunt. </
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Theorèma
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22.
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Rota minor in eodem ſitu de quo ſuprà æquè facilè moueri poteſt, ac maior
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