Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De Flamma & Fumo.
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nebant, ac tectum diſijceret. </
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<
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xml:space
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">Quapropter cautiùs operantur, qui
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ſpeculo plano excipientes Solis radium, illum in aliud ſpeculum
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intorquent, ex quo in puteum reflectitur: </
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<
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xml:id
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echoid-s6975
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xml:space
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">Mihique contigit ali-
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quando hac arte obſeruare aquæ motum in puteo alto cubitos octo-
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ginta, excepto per feneſtram ſolis radio. </
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>
<
s
xml:id
="
echoid-s6976
"
xml:space
="
preserve
">Non omnes tamen pu-
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teos, ex quibus aqua ſalſa hauritur admiſtam habere Naphtham,
<
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conſtat ex ſalinis fontibus Hallæ Saxonum, vbi operarij, vt adue-
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nis fontium profunditatem commonſtrent, in eos demittunt ſtra-
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mineas faces, ſinè tamen vllo vaporum incendio.</
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<
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<
s
xml:id
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xml:space
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">Grad. </
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<
s
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echoid-s6979
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xml:space
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">Non longè à probabilitate abeſt inferiorem putei partém
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repletam fuiſſe vaporibus illis pinguibus, qui ſubitâ flammâ exar-
<
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deſcentes tanto impetu eruperunt. </
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>
<
s
xml:id
="
echoid-s6980
"
xml:space
="
preserve
">Cœterùm ſi naphthæ guttas
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aliquot aquæ innatantes admota candela accendat, obſeruatum
<
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eſt illius ardorem in aquâ aliquanto diutiùs perſeuerare, quàm
<
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ſi in ſicco vaſe eadem naphthæ quantitas incendatur: </
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>
<
s
xml:id
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echoid-s6981
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xml:space
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">id quod
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fortaſſe tribuendum aliquis putetaquæ cohibenti, ne ſulphureæ
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particulæ toto ſuo impetu agitentur, & </
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<
s
xml:id
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xml:space
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">naphtham citiùs diſſol-
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uant; </
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<
s
xml:id
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xml:space
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">in ſicco autem vaſe nihil prohibet: </
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<
s
xml:id
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echoid-s6984
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xml:space
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">At aqua non com-
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plectitur guttarum innatantium niſi tenuiſſimam partem, quæ
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mergitnr pro ratione grauitatis ſpecificæ. </
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>
<
s
xml:id
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xml:space
="
preserve
">An ideò diu durat,
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quia ſubiecta aqua ſuo frigore nititur conſtipare ſulphureas
<
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particulas naphthæ ſibi proximas, quæ propterea languidiùs
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agitentur?</
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>
<
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<
s
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xml:space
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">Dand. </
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<
s
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xml:space
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">His aliud adnecte in artificioſis ignibus, qui in aquis
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conflâgrant, obſeruatum, videlicet eos ampliore flammâ collu-
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cere; </
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>
<
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xml:space
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">plerunque autem ex Naphtha, Sulphure, & </
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<
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xml:id
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echoid-s6990
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xml:space
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">cerâ parantur.
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</
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<
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xml:space
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">Non negârim quidem aliquid Optici Phænomeni intercedere; </
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<
s
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xml:space
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">quia
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enimea, quæ lucent, & </
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<
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xml:space
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">noctu maiora apparent, quàm inter-
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diu, & </
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>
<
s
xml:id
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"
xml:space
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">remota maiorem in oculo ſui imaginem imprimunt, quàm
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vicina, huiuſmodi verò ignium artificioſa ſpectacula in aquis exhi-
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bentur noctu, & </
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>
<
s
xml:id
="
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"
xml:space
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preserve
">à ſpectatoribus abſunt, idcirco nil mirum ſi
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amplior flamma videatur: </
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>
<
s
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="
echoid-s6996
"
xml:space
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">præterquam quod ad ſpectantium ocu-
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los non ſoli radij directi, ſed etiam ab aquâ reflexi veniunt, & </
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<
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maiorem lucis ſpeciem in oculi retinâ pingunt. </
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>
<
s
xml:id
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echoid-s6998
"
xml:space
="
preserve
">Re tamen verâ
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flammam ipſam augeri exiſtimo, calore ſcilicet accenſi ſulphuris
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aqua in vaporem ſoluta miſcetur erumpentibus igniculis, & </
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<
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amplior flamma gignitur; </
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<
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">adeoque cum nequeant tam celeriter
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auolare ſic permiſti exilientes igniculi, diutiùs flamma durat, </
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