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

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              quæ & calorem ex illo motu naſcentem, quo corpora tene­
                <lb/>
              reſcunt, magisq, fragilia fiunt, obtundit. </s>
              <s>Vnde adamantes, qui­
                <lb/>
              bus gemmæ ſolidiores poliuntur, ex illâ velocitate motûs ſpe­
                <lb/>
              ciem carbonis igniti aſſumunt. </s>
              <s>Differentia autem plagæ fit
                <lb/>
              pro ratione arenularum: craſſiores enim & magis duræ ma­
                <lb/>
              iora auferunt ſegmenta. </s>
              <s>
                <expan abbr="Itaq;">Itaque</expan>
              gemmas rudiores,
                <expan abbr="multúmq;">multúmque</expan>
                <lb/>
              aſperitatis habentes priùs ſaxis arenulatis, quæ molis circum­
                <lb/>
              aguntur, affricantes, illâ attritione complanant: inde lapide
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              ſmiri in farinam trito poliunt: & magis ſubtili eiuſdem polline
                <lb/>
              levigantes, demum perfectionem terrâ tripolitanâ inducunt. </s>
              <lb/>
              <s>Vitra tamen quia molliora, calce ſtanni levigantur. </s>
              <lb/>
              <s>Nec differt illarum ſectio per ſerram æream edentulam facta,
                <lb/>
              lentiſſimo tractu arenulis interfuſis radente: pro
                <expan abbr="quarũ">quarum</expan>
              diverſi­
                <lb/>
              tate mutatur
                <expan abbr="quoq;">quoque</expan>
              vulneris amplitudo. </s>
              <s>Nam craſſior arena,
                <lb/>
              inquit Plinins, laxioribus ſegmentis terit, & plus erodit mar­
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              moris,
                <expan abbr="maiúſq;">maiúſque</expan>
              opus ſcabritia polituræ relinquit. </s>
              <s>Ita ſectæ atte­
                <lb/>
              nuantur cruſtæ. </s>
              <s>Duplex ergo incommodum ab arenâ craſſio­
                <lb/>
              re: nam & plus decedit gemmis à plagâ latiore: & ſuperficies
                <lb/>
              aſpera maiorem in poliendo laborem exigit. </s>
              <s>
                <expan abbr="Itaq;">Itaque</expan>
              olim
                <expan abbr="uſq;">uſque</expan>
                <lb/>
              ad Æthiopas, & Indos arena petebatur: quarum Æthiopica
                <lb/>
              mollior,
                <expan abbr="nullâq;">nullâque</expan>
              ſcabritie ſecans. </s>
              <s>Nunc verò lapis ſmiri &
                <lb/>
              terra tripolitana in uſum polituræ ſucceſſit. </s>
              <s>
                <expan abbr="Neq;">Neque</expan>
              ſolum gem­
                <lb/>
              mæ, marmora, & vitrum arenâ, ſeu lapide arenoſo poliuntur;
                <lb/>
              ſed etiam metalla: cotibus enim ferrum atteri & pulvere ſmi­
                <lb/>
              ri levigari conſtat. </s>
              <s>Verùm hæc inſuper limam ſentiunt:
                <lb/>
              quòd gemmis non convenit. </s>
              <s>Tametſi dicat Plinius nobili­
                <lb/>
              um gemmarum ſoli Topazio id accidere: reliquas verò coti­
                <lb/>
              bus Naxijs poliri. </s>
              <s>Quod quidem de politurâ rudiori & incho­
                <lb/>
              atâ intelligendum:
                <expan abbr="neq;">neque</expan>
              enim aut reliquas gemmas cotibus:
                <lb/>
              aut topazium limâ perfici potuiſſe credendum. </s>
              <s>Noſtratem
                <lb/>
                <expan abbr="quoq;">quoque</expan>
              topazium licet molliorem reliquis gemmis, limam </s>
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