Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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pro veſtrâ humanitate tenuitati meæ ve
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niam dabitis, ſi quid afferre contigerit ita
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planum ac facilè, vt veſtrorum ingeniorum
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ſublimitati non reſpondeat. </
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<
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>Nihil habeo
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certi quod ſtatuam de terræ quantitate, ne
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que enim hactenus otium fuit, quæ conce
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peram, in praxim deducere. </
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<
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>Fieri autem
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poſſe exiſtimo, vt operâ non longâ propo
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ſitum ſcopum aſſequamur: duo nimirum̨
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præcognoſci oportet, quibus notis ac certis
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terrenam diametrum poſſumus inueſtigarę. </
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Primum eſt altitudo oculi ſupra maris iņ
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immenſum patentis ſuperficiem, quæ non
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æquabili planitie explicatur, ſed ſphæram̨
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æmulatur: hanc verò altitudinem certiſſi
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mè nobis innoteſcere poſſe quis neget? </
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<
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>cum
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eam funiculo vel phyſicâ aliâ menſurâ ſæ
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piùs dimetiri liceat. </
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>Alterum, quod in hoc
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negotio requiritur, eſt angulus, quem cum
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lineâ perpendiculi ad terræ centrum ductâ
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conſtituit opticus radius extremum hori
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zontem allambens: hunc ſi organo ad id
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affabrè elaborato obſeruaueris, ſereno cœlo,
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tranquillo mari, cum minima refractionis
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ſuſpicio ſubeſſe poteſt, quid certius requi
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ras? </
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<
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>cum organo eidem in dimetiendis ſy
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derum altitudinibus aut diſtantijs acquie
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ſcas. </
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<
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