Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              cuti & tremere incipiat,
                <expan abbr="atq;">atque</expan>
              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. </s>
              <s>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. </s>
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                <expan abbr="Itaq;">Itaque</expan>
              videmus illas partes, quæ ictum exci­
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              pere coguntur, præ alijs frangi & collidi: nequaquam à plagâ
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              remotiores. </s>
              <s>Quia nimirum cùm
                <expan abbr="unaquæq;">unaquæque</expan>
              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. </s>
              <s>Ita
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              quidem in principio motûs,
                <expan abbr="quouſq;">quouſque</expan>
              producitur impulſus:
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              quam tamen inæqualitatem æquat centrum grauitatis, omni­
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              um vim colligendo; cùm ab omnibus urgeatur:
                <expan abbr="atq;">atque</expan>
              ita fit, ut
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              tardiores incitentur, velociores retardentur: quò eodem
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              cum centro gravitatis motu ferantur. </s>
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              <s>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
                <expan abbr="Itáq;">Itáque</expan>
              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. </s>
              <s>Quòd ſi ergo corpora eiuſdem molis &
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              ſoliditatis, percutias ictu latiore
                <expan abbr="eóq;">eóque</expan>
              plano; videbis in medio
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              plagæ ſitas partes priùs frangi, ijs quæ in ambitu ſunt
                <expan abbr="quandoq;">quandoque</expan>
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              illæſis. </s>
              <s>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. </s>
              <s>Quin motus in aëre quid aliud, quàm percuſſio
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              & plaga continuata: unde in aëre craſſiore, licet ab eadem </s>
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