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

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              <s>
                <pb xlink:href="018/01/090.jpg" pagenum="77"/>
              mentatis tribus tigillis, ducatur recta AB
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              vnciarum 10. ex. </s>
              <s>gr. & ſuper eâ fiat triangu­
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              lum æquilaterum AEB. </s>
              <s>Quod ſi tigilli ni­
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              mis longi eſſent, interuallo A
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              e
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              deſcribantur
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              duo arcus ſe inuicem ſecantes in
                <emph type="italics"/>
              i
                <emph.end type="italics"/>
              , & inter­
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              uallo A
                <emph type="italics"/>
              u
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              arcus ſe ſecantes in
                <emph type="italics"/>
              o
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              : per hæc enim
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              puncta ductâ lineâ ex A, accipi poterit AE
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              æqualis ipſi AB, & erit angulus BAE gr. 60.
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              Relinquitur autem tigillus EF longior, vt in
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              FA ſecundùm rectam EA productam in F
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              conſtituatur tubulus H infundibuli in mo­
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              rem excauatus, per quem viſus rectâ traii­
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              ciatur in deſtinatum ſcopum per aciculam
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              in E perpendiculariter erectam, ex qua de­
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              pendet perpendiculum; hoc enim facit cum
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              lineâ EA angulum diſtantiæ obiecti à verti­
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              ce obſeruatoris. </s>
              <s>Quantitas verò huius an­
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              guli per Trigonometriam reperitur ex datis
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              lateribus AE, & A
                <emph type="italics"/>
              u
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              & angulo
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              u
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              AE compre­
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              henſo gr. 60. ex conſtructione. </s>
              <s>Vel ſi fortè
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              breuiùs operari placeat, fingatur ex E puncto
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              in ſemiſſem lateris AB cadere linea perpen­
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              dicularis, cuius quantitas facilè innoteſcit:
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              deinde illâ aſſumptâ vt Radio, vt Tangentę
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              verò diſtantiâ perpendiculi à medio lineæ
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              AB, angulus quæratur, quem facit perpen­
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              diculum cum fictâ illâ perpendiculari; hic
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              enim angulus additus gradibus 30. ſi perpen­</s>
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