Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De ignis loco.
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ſe omni aëre, qui ſuâ leuitate metalli grauitatem imminuere
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valeat.</
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<
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xml:space
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tus peruadenti facilè tribui poteſt illa ponderis acceſſio, quin
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ignem propterea grauem dicamus. </
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<
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xml:space
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">Cum enim cuprum præ ar-
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gento ampliores poros habeat, plus admiſit ex illâ fuligine, ideò-
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que maius in cupro fuit quàm in argento incrementum graui-
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tatis: </
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<
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xml:space
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">& </
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<
s
xml:id
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xml:space
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">fortaſſe non æquè purum adhibitum eſt ſulphur vtri-
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que experimento, vt proinde alterius fuligines additæ fuerint
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grauiores.</
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<
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<
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<
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cauſam referenda hæc ponderis appendicula; </
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<
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xml:space
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">Nam laminarum
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cuprearum vncia vna in depreſſo crucibulo impoſita furno pro-
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batorio, ibique duas horas ſeruata, acquiſiuit ponderis grana
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triginta: </
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<
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xml:space
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">& </
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<
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xml:space
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">ramentorum cupri vncia breuiſſimo crucibulo inie-
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cta, atque tegulâ fornicatâ cooperta, in furno probatorio ad
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tres horas relicta, demum deprehenſa eſt granis quadraginta
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nouem aucta. </
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<
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xml:space
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">Similiter vncia ſtanni Anglici in catino tegulâ for-
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nicatâ cooperto poſt duas horas extracta è furno probè calcinata,
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drachmam integram lucrata fuerat. </
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<
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xml:space
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">Item ramentorum chalybeo-
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rum drachmæ quatuor per duas horas in catino ſub fornicatâ
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tegulâ detentæ incrementum ponderis acquirebant vnius drachmę
<
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& </
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<
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">granorum ſex cum quadrante. </
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<
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xml:space
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">Hìc nullæ interceſſerunt ſulphu-
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ris fuligines.</
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</
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<
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<
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<
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xml:space
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">Experimenta huiuſmodi ab ingenuo viro producta quis
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niſi plenus inconſiderantiſſimæ, ac dementiſſimæ temeritatis infi-
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cietur? </
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xml:space
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">Hìc mihi tamen ex animo euellendus eſt ſcrupulus, qui
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me non parum ſtimulans adhuc ancipitem reddit. </
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<
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xml:space
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<
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">ignis
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iſte, quem Reuerberij vocant: </
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">ſuas habet fuligines, quæ etiam
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ſub tegulam inſinuare ſe valeant in crucibulum, & </
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<
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xml:space
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ſceri, cui proinde pondus addant?</
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<
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<
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xml:space
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">At fuligini ipſi igniculos ineſſe non paucos contendent
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igneæ grauitatis aſſertores. </
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<
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xml:space
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">Certè ſi fuliginem in aquâ diſſolutam
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tandiu coquas, donec ſanguinis inſtar aqua rubeſcat, tum hanc
<
lb
/>
terreo vaſe exceptam brumali tempore exponas frigori maximo,
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adeò vt tota demum in glaciem albam concreſcat; </
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<
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xml:space
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">ſi omnia con-
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fringantur, in mediâ glacie reperies oleum maximè calidum in-
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ſtar ſanguinis rubrum, quod præſtantiſſimum dicitur </
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