Casati, Paolo, Fabrica, et uso del compasso di proportione, dove insegna à gli artefici il modo di fare in esso le necessarie divisioni, e con varij problemi ...

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            <s xml:id="echoid-s115" xml:space="preserve">
              <pb o="7" file="0019" n="20" rhead="Fondamento."/>
            AHI, deuono eſſere nell’ iſteſſo piano; </s>
            <s xml:id="echoid-s116" xml:space="preserve">onde ſe la linea AE
              <lb/>
            foſſe ſopra vna ſupei ficie incuruata, non procederebbe la di-
              <lb/>
            moſtrazione: </s>
            <s xml:id="echoid-s117" xml:space="preserve">Perciò ſi vede, quanto ſia neceſſario, che le re-
              <lb/>
            gole ſiano così ben’aggiuſtate e ſode, che ne in ſe ſteſſe facil-
              <lb/>
            mente s’incuruino, & </s>
            <s xml:id="echoid-s118" xml:space="preserve">anche allargate ſi conſeruino nell’iſteſſo
              <lb/>
            piano Deuono poi eſſere ciaſcuna tanto larghe, che vi poſ-
              <lb/>
            ſa capire tutta la moltitudine delle linee, che vi ſi vorranno
              <lb/>
            tirare, ſenza confuſione, & </s>
            <s xml:id="echoid-s119" xml:space="preserve">in modo, che li numeri notati alli
              <lb/>
            punti delle diuiſioni ſi poſſano commodamẽte oſſeruare ſen-
              <lb/>
            za pericolo d’errore, con prender’il numero corriſpondente
              <lb/>
            ad vn punto per vn’altro.</s>
            <s xml:id="echoid-s120" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s121" xml:space="preserve">Auuertaſi eſſer neceſſario nell’o perationi prendere col Cõ-
              <lb/>
            paſſo accuratamente la lunghezza delle linee, e perciò con-
              <lb/>
            uiene, che le ſue punte ſiano ben’ acute: </s>
            <s xml:id="echoid-s122" xml:space="preserve">e ſe tali non foſſero,
              <lb/>
            ſi potranno alle gambe del Compaſſo con ſottili cordicelle
              <lb/>
            da liuto legare ſtrettamente due aghi da cucire, le cui punte
              <lb/>
            ſono ſottiliſſime, & </s>
            <s xml:id="echoid-s123" xml:space="preserve">acute, quanto baſta ad ogni più accurata
              <lb/>
            operatione.</s>
            <s xml:id="echoid-s124" xml:space="preserve"/>
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          <head xml:id="echoid-head12" xml:space="preserve">CAPO SECONDO.</head>
          <head xml:id="echoid-head13" style="it" xml:space="preserve">Come ſi diuida il Compaſſo di Proportione per le ſemplici lunghezze
            <lb/>
          di linee Rette, & vſo di queſta linea Aritmetica.</head>
          <p>
            <s xml:id="echoid-s125" xml:space="preserve">IL primo, e più facile vſo di queſto Stromento è in ordine
              <lb/>
            alle ſemplici lung hezze di linee Rette perciò da queſte ſi
              <lb/>
            comincia. </s>
            <s xml:id="echoid-s126" xml:space="preserve">Si tir
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            ano dunque dal centro A due linee rette AE,
              <lb/>
            AL, e queſte ſi diuidono nelle più minute parti vguali, che ſi
              <lb/>
            può, ſalua la diſtintione neceſſaria, per non confonderſi nel
              <lb/>
            numerarle, & </s>
            <s xml:id="echoid-s127" xml:space="preserve">hauuto riſguardo alla lunghezza delle regole.
              <lb/>
            </s>
            <s xml:id="echoid-s128" xml:space="preserve">E quì fà di
              <unsure/>
            meſtieri apportarui tutta la diligenza, per </s>
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