Marci of Kronland, Johannes Marcus, De proportione motus, seu regula sphygmica ad celeritatem et tarditatem pulsuum, 1639
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                habens cauitatem in parte ſuperiore, & à plagâ auerſa,
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                centrum verò grauitatis in
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                ne dum labitur ſe inuertat:
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                quód ſi ergo alium globum
                  <expan abbr="quocunq́">quocunque</expan>
                ; exceſſu leuio­
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                rem conſtituas in illà cauitate, eádem cum illo vaſe ce­
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                leritate feretur. </s>
                <s id="N14495">At verò ſi inæqualitas motus eſſet
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                à grauitate, oporteret illud vas magis ponderoſum
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                præcurrere, globum verò leuiorem attolli, & longo poſt
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                tergum interuallo relinqui. </s>
                <s id="N1449E">Obiicies grauitas eſt impul
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                ſus, impulſus verò per Prop: 2. motum producit ſibi æ
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                qualem; à majori ergò grauitate major, ac proinde velo­
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                cior motus: quòd ſi ergò libra una in
                  <expan abbr="quinq́">quinque</expan>
                ; ſecundis
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                per ſpatium mouet cubitorum 100, mouebit hujus du­
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                plum in eodem, vel æquali tempore per ſpatium
                  <expan abbr="duplũ">duplum</expan>
                .
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                Deinde plaga inducitur ex motu; non enim manus à la­
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                pide in eà quieſcente, ſed ubi iram ex motu concepit, vul
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                neratur: at verò majus pondus æquali lapſu magis vulne
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                rat, velocior ergo motus. </s>
                <s id="N144BB">Reſpondeo grauitatem eſſe
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                impulſum, & velocitatem motus in eá ratione, in quá eſt
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                grauitas ſeu impulſus; dupla ergo grauitas in eodem, vel
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                æquali tempore mouebit per ſpatium duplum. </s>
                <s id="N144C4">At verò
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                cùm inferunt libras duas Vg: plumbi in duplà ferri celeri
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                tate ad libram unam, falluntur; propterea quòd illa gra­
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                uitas in alio ſit ſubiecto, cuius partes omnes æquali gra­
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                uitate mouentur: ſicuti enim pars extra totum Vg. libra
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                una â ſua grauitate mouetur cum tantà velocitate, ita </s>
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