Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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cuti & tremere incipiat,
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etiam eâ immotâ ruere ædificia:
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homines pedibus inſiſtere non valentes collabi & vacillare: fa
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ctâ enim plagâ in viſceribus terræ medijs immotis impetus huc
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ſe effundit: quemadmodum percuſsâ muri parte oppoſitâ, ea
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quæ muro hærent, delabuntur. </
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<
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>Notandum ſecundò. impul
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ſum non recipi uniformiter in mobili; ſed receſſu à ſummo vi
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gore, quem infert plaga, ſenſim attenuari tam in profundum,
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quàm in latum. </
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videmus illas partes, quæ ictum exci
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pere coguntur, præ alijs frangi & collidi: nequaquam à plagâ
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remotiores. </
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>Quia nimirum cùm
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particula ſuo impul
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ſu feratur & incitetur ad motum; dum hæ præcurrere feſti
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nant, illæ ob tarditatem ſequi non valent, quà impetus magis
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urget, ſi uniones habeant ſolubiles, avelli contingit. </
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quidem in principio motûs,
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producitur impulſus:
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quam tamen inæqualitatem æquat centrum grauitatis, omni
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um vim colligendo; cùm ab omnibus urgeatur:
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ita fit, ut
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tardiores incitentur, velociores retardentur: quò eodem
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cum centro gravitatis motu ferantur. </
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>Motus ergo centri eſt principium motûs reliquorum: & cùm
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à motu fiat plaga; erit huius motus & ratio in ordine ad cen
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trum
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Itáq;
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fit utictus perpendicularis omnium ſit grauiſſimus:
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obliquorum verò tantò vim habeat minorem, quantò magis
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obliquè ferit: eo enim modo habet hic motus, quo grauitas
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in lapſu inclinato. </
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>Quòd ſi ergo corpora eiuſdem molis &
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ſoliditatis, percutias ictu latiore
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plano; videbis in medio
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plagæ ſitas partes priùs frangi, ijs quæ in ambitu ſunt
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illæſis. </
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>Porro impulſus in mobili, quia à plagâ cæpit, in aliam
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plagam deſtinatur. & ſi quidem plagam totam peregit, totus; ſi
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partem, in eadem ratione exſolvitur impulſus, ut conſtat ex
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propoſ: 37. </
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<
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>Quin motus in aëre quid aliud, quàm percuſſio
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& plaga continuata: unde in aëre craſſiore, licet ab eadem </
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