Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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oculo ad centrum applicato perpendiculum
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indè ſuſpenſum cadere parallelum perpendi
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culo, quod ex extremâ diametro pendet, &
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conſtituere angulum cum diametro æqua
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lem illi, quem cum eâdem diametro facit
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perpendiculum ex eius extremitate ſuſpen
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ſum. </
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<
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>Quare ſola centri altitudo ſupra terræ
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ſuperficiem, aſſumenda eſt tanquam oculi
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obſeruatoris altitudo. </
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Guld.
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<
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> Vel ſi minùs placeat perpendiculo
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vti, Quadrantis latus horizontaliter iacens
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duplicetur, & in extremâ diametro fiat cen
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trum, circa quod conuerſa dioptra tantiſper
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eleuetur, dum linea fiduciæ congruat radio
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optico terram tangenti; nam ſemiſsis anguli
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ad centrum facti cum latere horizontaliter
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iacente inſiſtentis eidem arcui, eſt angulus
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depreſsionis infra horizontem, æqualis an
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gulo ACD facto in centro terræ; cuius com
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plementum eſt quæſitus angulus CAD. </
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Gal.
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<
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> An non operæ pretium facturus eſ
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ſet, qui illud demum in praxim deduceret,
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quod ego olim aliud neſcio quid meditans
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perficiendum iuſsi, ſed aliis curis diſtractus
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ad exitum non perduxi? </
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<
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verticali lineam horizontalem longam pe
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des Rom. ferè quinquaginta, & in eius ex
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tremo puncto, quod eam cæli plagam re-</
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