Casati, Paolo
,
De igne dissertationes physicae
,
1686
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Diſſertatio Sexta.
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deſinat, obſeruaui ex pyramide percuſſâ admodum paucas ſcintil-
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las emicare, ex priſmate aliquanto plures, ſed ex baſi ſeu radice
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admodum frequentes, & </
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<
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</
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<
s
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xml:space
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">ſi verò ex aĕre attrito ignis ille gigneretur, multo magis id con-
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tingeret, quando durior, & </
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<
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chryſtalli pars, ſcilicet priſmatis, aut pyramidis angulus à radice
<
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remotior, percutitur. </
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<
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xml:space
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">Nam quod aëris attriti ea ſit vis, vt plum-
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beas ſagittarum cuſpides liquefaciat, vt ſcribit Ariſtoteles lib. </
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<
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xml:space
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de Cœlo text. </
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<
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">42. </
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<
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xml:space
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">nobis credibile non eſt, qui plumbeos (immò ne
<
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cereos quidem) globulos è fiſtulis ferreis vi ignis euibratos non li-
<
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quefieri, licèt velociùs impulſos, quàm ſagitta ab arcûs neruo
<
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excuſſa, quotidie videmus: </
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<
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xml:space
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">ſed vel ſycophanta aliquis immode-
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ratè abuti voluit Philoſophi facilitate, vel ineptus quiſpiam au-
<
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ceps calamum videns priuatum mucrone, qui fortè in motu ex-
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cidit, ſatis inſulsè exiſtimauit liquefactum plumbum perijſſe. </
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<
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terùm aliquando ex ſolo ſilice ſcintillas exilire poſſe conſtat, quia
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illas ex mutuâ duorum ſilicum colliſione abſque vllo ferro erupiſſe
<
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teſtantur plurimi (mihi quippe id videre non contigit) neque cre-
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ditu difficile eſt, nam idem pyritibus colliſis accidit, atque, ſi Ari-
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ſtoteli lib. </
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<
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<
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">adhibenda eſt fides, ex percuſſis leo-
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num oſſibus quaſi ex ſilice elicitur ignis: </
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<
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">Aliquando ex ſolo cha-
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lybe, nam memini vberes ſcintillas emanaſſe ex chalybeâ rotâ an-
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tiquiori ſclopo affixâ, quoties ſiuè caſu, ſiuè conſultò, cum prę-
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claram ferri temperationem vellem pueriliter experiri, laxato è la-
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tere rota ipſa excurreret, nec omnino pyritem tangeret: </
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<
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etiam paſſim obſeruare licet, quando circumactâ velociùs cote re-
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ſtituitur acies obtuſis nouaculis, ſæpè enim plurimæ emicant ſcin-
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tillæ, quemadmodum & </
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erutus non abundat huiuſmodi igniculis. </
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& </
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<
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xml:space
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">ex chalybe, cum vterque igniculos contineat, in vulgari
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igniario excitari ſcintillas procliue eſt opinari: </
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">ſiquidem ſi lapidem
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ferro aliquoties percutias ad excutiendum ignem, & </
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dâ papyro excipias minutiſſimas particulas, quæ ex illa colliſione
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ſeparantur, adhibito microſcopio non ſolùm lapideas arenulas
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videbis, ſed & </
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<
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in ſpeciem globi excauati, aut ſcaphij, efformatas, cuiuſmodi
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ſunt, quas Bombas vulgariter appellamus; </
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<
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ceptacula ignis, quiex ijs à reliquo ferro diuulſis, aperto </
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