Marci of Kronland, Johannes Marcus, De proportione motus, seu regula sphygmica ad celeritatem et tarditatem pulsuum, 1639
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              <p id="N10AEF" type="main">
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                ſit una, lineæ verò obliquæ infinitæ. </s>
                <s id="N10E45">Confirmatur ex
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                modo agendi reliquorum agentium naturalium, quæ
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                non niſi per lineas rectas operantur. </s>
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            <subchap1 id="N10E4C">
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                Propoſitio IV.
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                </s>
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              <p id="N10E56" type="main">
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                Impulſus in quolibet puncto circuli per lineam fit tangentem.
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                </s>
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              <p id="N10E5F" type="main">
                <s id="N10E61">QVia enim motus eſt rectus per pro: 3. talis autem
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                eſſe non poteſt in circulo, igitur ſi incipiat ab ali­
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                quo puncto circuli, cadet immediaté poſt illud pun­
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                ctum extra peripheriam illius circuli: non poteſt au­
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                tem cadere intra circulum, cadet igitur extra circulum.
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                Probatur, punctum circuli immediatè ante contactum
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                verbi gratia
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                a
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                impellit
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                o
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                ad motum rectum:
                  <expan abbr="punctũ">punctum</expan>
                ergo
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                immediatè poſt illum contactum erit cum duobus pun
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                ctis
                  <emph type="italics"/>
                a
                  <emph.end type="italics"/>
                &
                  <emph type="italics"/>
                o
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                in lineà rectà, aut certè ad hujus rectitudinem
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                quam proximè fieri poteſt, accedet: at verò intra peri­
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                pheriam circuli nullum eſſe poteſt punctum, quod cum
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                duobus illis punctis
                  <emph type="italics"/>
                a
                  <emph.end type="italics"/>
                &
                  <emph type="italics"/>
                o
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                ſit in lineà rectà, aut ad natu­
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                ram lineæ rectæ quam proximè accedat, verum ad ma­
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                iorem curuitatem: cùm neceſſariò ſit in peripheria ali­
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                cujus circuli minoris. </s>
                <s id="N10EA8">Cadat enim, ſi fieri poteſt, intra </s>
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            </subchap1>
          </chap>
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