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

Table of figures

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              <s>Hæc de levigatione. </s>
              <s>Politura eundem finem habet; nimi­
                <lb/>
              rum ſuperficiem erugatam,
                <expan abbr="terſámq;">terſámque</expan>
              : differentia eſt in modo
                <lb/>
              & medijs ad hunc finem. </s>
              <s>Nam levigatio deprimit, aut in lacu­
                <lb/>
              nas transfert: politura adimit ſcabritiem efficientes partes. </s>
              <lb/>
              <s>Quæ quidem differentia in materiâ fundatur: cuius partes
                <expan abbr="neq;">neque</expan>
                <lb/>
              comprimi valent,
                <expan abbr="neq;">neque</expan>
              aliò transferri: Talia ſunt vitra, gemmæ,
                <lb/>
              lapides,
                <expan abbr="atq;">atque</expan>
              omnia
                <foreign lang="grc">ἀπιες ὰ χ
                  <gap/>
                ̀ θζαυ
                  <gap/>
                ὰ</foreign>
              . </s>
              <s>Igitur quædam
                <expan abbr="utroq;">utroque</expan>
                <lb/>
              modo hunc finem conſequuntur, & politurâ & levigatione, ut
                <lb/>
              metalla: quædam ſolâ levigatione, ut papyrus, lintea, cera:
                <lb/>
              quædam non niſi politurâ, ut gemmæ, lapides, vitra. </s>
              <s>Ratio
                <lb/>
              eſt quia nequeunt dividi in partes minimas: ſiue ob viſcidita­
                <lb/>
              tem magis tenacem, ſiue ob craſſitiem. </s>
              <s>
                <expan abbr="Itaq;">Itaque</expan>
              fit, ut dum plus,
                <lb/>
              minúſue à ſcabritie aufert politura; prior inæqualitas con­
                <lb/>
              tinuò aliâ permutetur. </s>
              <s>Deinde levigatio in multis incipit à
                <lb/>
              politurâ: cùm nimirum maior eſt aſperitas, quàm compreſſio
                <lb/>
              eſſe poſſit; neceſſe ergo illum exceſſum adimi, quò reliqua ſu­
                <lb/>
              perficies levigationem habeat magis expeditam: ita enim ligna
                <lb/>
                <expan abbr="atq;">atque</expan>
              metalla non niſi ferro acciſa levigantur. </s>
              <s>
                <expan abbr="Neq;">Neque</expan>
              idem eſt
                <lb/>
              modus polituræ in omnibus;
                <expan abbr="neq;">neque</expan>
              idem principium. </s>
              <s>Nam pro­
                <lb/>
              ut materiâ, & ſuperficie magis & minùs aſperâ à ſe differunt;
                <lb/>
                <expan abbr="atq;">atque</expan>
              ab alijs plus, ab alijs minùs eſt auferendum; ita
                <expan abbr="quoq;">quoque</expan>
              inſtru­
                <lb/>
              menta varia ſunt inventa. </s>
              <s>Saxa enim & marmora malleo de­
                <lb/>
              cuſſis, aut ferro acciſis promontorijs æquantur: gemmæ verò
                <lb/>
              affricatione adlapidem arenarium molâ circumactum, corti­
                <lb/>
              cem priùs, quò veſtiuntur, exuunt; inde ſerrâ obtusâ in
                <expan abbr="ſegmẽ-ta">ſegmen­
                  <lb/>
                ta</expan>
              dividuntur: demum arenâ
                <expan abbr="atq;">atque</expan>
              huius polline levigantur. </s>
              <lb/>
              <s>Ligna verò ſecuri, cuneo, ſerrâ finduntur & ſecantur: dein­
                <lb/>
              de aſciâ, tornóve poliuntur. </s>
              <s>Eſt autem nobis propoſitum non
                <lb/>
              niſi de motu & impulſu agere, quo ſuperficiem politam obti­
                <lb/>
              nemus; nequaquam verò de arte poliendi, quæ ſuis Magiſtris
                <lb/>
              eſt relinquenda. </s>
              <s>Incipiam verò à Lignorum politurâ, </s>
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