Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

Table of figures

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              Permirumque eſt, ſi cubiculum ſit contiguum,
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              quod oſtiolo, rimuliſve cum camera communicet,
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              & clauſis feneſtris caminum ſolùm apertum habeat,
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              ſuccedere aërem ex illo in cameram, dum alius in­
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              tereà ſupernè, atque deforis in ipſius cubiculi cami­
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              num inducitur, cuius ductus ſi ſit anguſtior, & ſub­
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              jectus ignis igne camera inualidior, aër deſcendens
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              fumum repellet, cubiculumque fumo complebit.
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              <s id="id.000807">Clarum eſt aliunde vt per hiemen ſedenti ad ignem
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              pedes antrorſum incaleſcant, ad calcem verò refri­
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              gerentur; impetente ſcilicet calcem ipſo aere frigido,
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              qui extrinſecus ad ignem contendit. </s>
              <s id="id.000808">Conſidera
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              etiam quemadmodum ignis vehementius ardeat, ſi­
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              ligna, aut carbones crate ferrea ſuſtententur, quàm
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              ſi focario lapidi, cineribuſve inſiſtant: quia videlicet
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              poteſt aër ſeſe meliûs ſupponere, & inter abigendum
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              ſurſùm ignem, ligna, carboneſve perflare: vnde &
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              Chymicorum fornax, quàm flatuoſam vocant, non
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              aliis eget follibus, quàm aëre ſubter appellente, &
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              ſuperexſtanteis carbones validiſſimo flatu ventilante.
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              <s id="id.000809">Atque ex his denique dico, eſſe quidem in Terra
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              motus rectos ſurſùm, & deorſùm; ſed illos eſſe par­
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              tium proprios (vt ſunt etiam propriæ grauitas, &
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              leuitas) non verò proprios totius Terræ, ipſique po­
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              tiùs tam grauitatis, quàm leuitatis experti, ſphæ­
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              ricáque formâ tornatæ, circularem motum aut com­
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              petere, aut non repugnare. </s>
              <s id="id.000810">Rem declararem exem­
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              plo nauis, in qua qui aſcendunt, exſcenduntque, &
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              quæ attolluntur, deprimunturque omnia non ob­
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              ſtant, quò minùs nauis ſuum curſum eat; verum res </s>
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