Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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              <s>
                <pb xlink:href="018/01/082.jpg" pagenum="74"/>
              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. </s>
              <s>Quare ſola centri altitudo ſupra terræ
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              ſuperficiem, aſſumenda eſt tanquam oculi
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              obſeruatoris altitudo. </s>
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              <s>
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              Guld.
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              </s>
              <s> 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. </s>
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            <p type="main">
              <s>
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              Gal.
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              </s>
              <s> 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? </s>
              <s>Duxeram in plano
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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-</s>
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