Alberti, Leon Battista, L' architettura

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        <div xml:id="echoid-div175" type="section" level="1" n="85">
          <p>
            <s xml:id="echoid-s8039" xml:space="preserve">
              <pb o="174" file="178" n="178" rhead="DELLA ARCHITETTVRA"/>
            curatamente. </s>
            <s xml:id="echoid-s8040" xml:space="preserve">Sono certamentele Ruote in gran parte molto ſimili a Curri:
              <lb/>
            </s>
            <s xml:id="echoid-s8041" xml:space="preserve">percioche ſempre da vn ſol punto a piombo premono a lo in giù: </s>
            <s xml:id="echoid-s8042" xml:space="preserve">Ma ecci que-
              <lb/>
            ſta differentia che i curri ſono piu eſpediti, & </s>
            <s xml:id="echoid-s8043" xml:space="preserve">le ruote per l’infragneruiſi dentro
              <lb/>
            il perno, ſanno l’officio loro piu tardo. </s>
            <s xml:id="echoid-s8044" xml:space="preserve">Le parti de le Ruote ſono tre, il circui-
              <lb/>
            to maggiore di ſuori di eſſa ruota, il Perno del mezzo, & </s>
            <s xml:id="echoid-s8045" xml:space="preserve">quel buco, doue entra
              <lb/>
              <note position="left" xlink:label="note-178-01" xlink:href="note-178-01a" xml:space="preserve">5</note>
            il Perno. </s>
            <s xml:id="echoid-s8046" xml:space="preserve">Queſto Perno alcuni ſorſe lo chiameranno il polo, ma a noi, percio-
              <lb/>
            che egli in alcuni inſtrumenti ſta ſaldo, & </s>
            <s xml:id="echoid-s8047" xml:space="preserve">in alcuni altri ſi gira, ſia lecito il chia-
              <lb/>
            marlo Perno. </s>
            <s xml:id="echoid-s8048" xml:space="preserve">Sela Ruota ſi girerà ſopra vno Perno groſſo, ſi girerà con ſatica;
              <lb/>
            </s>
            <s xml:id="echoid-s8049" xml:space="preserve">ſe intorno ad vn ſottile non reggerà a peſi, ſe il circuito di ſuori di eſſa ruota ſa-
              <lb/>
            rà ſtretto, ſi come dicemmo de Curri ſi ſiccherà nel piano; </s>
            <s xml:id="echoid-s8050" xml:space="preserve">ſe ſarà largo, andrà
              <lb/>
              <note position="left" xlink:label="note-178-02" xlink:href="note-178-02a" xml:space="preserve">10</note>
            vagellando hor da una parte, & </s>
            <s xml:id="echoid-s8051" xml:space="preserve">hora da l’altra; </s>
            <s xml:id="echoid-s8052" xml:space="preserve">& </s>
            <s xml:id="echoid-s8053" xml:space="preserve">ſe perauentura le ruote ſi ha-
              <lb/>
            rãno a ſuolgere, o da deſtra, o da ſiniſtra, obbediranno malageuolmente; </s>
            <s xml:id="echoid-s8054" xml:space="preserve">ſe il cer
              <lb/>
            chio in che ſi gira il Perno ſarà largo piu che il biſogno, rodendo egli ſe n’eſce,
              <lb/>
            ſe troppo ſtretto, non gira, infra il Perno, & </s>
            <s xml:id="echoid-s8055" xml:space="preserve">il Cerchio in che ei ſi volge biſogna
              <lb/>
            che ſia vn mezzano che lo lubrichi, perche l’uno di queſti ſerue per il piano, & </s>
            <s xml:id="echoid-s8056" xml:space="preserve">
              <lb/>
              <note position="left" xlink:label="note-178-03" xlink:href="note-178-03a" xml:space="preserve">15</note>
            l’altro per il ſondo del pe
              <unsure/>
            ſo. </s>
            <s xml:id="echoid-s8057" xml:space="preserve">I Curri, & </s>
            <s xml:id="echoid-s8058" xml:space="preserve">le Ruote ſi fanno d’olmo, & </s>
            <s xml:id="echoid-s8059" xml:space="preserve">di leccio.
              <lb/>
            </s>
            <s xml:id="echoid-s8060" xml:space="preserve">I Perni d’Agriſoglio, & </s>
            <s xml:id="echoid-s8061" xml:space="preserve">di Corniolo, o piu preſto di Ferro, il miglior cerchio di
              <lb/>
            tutti gli altri in cui ſi gira il Perno, ſi ſa di Rame meſcolatoui vn terzo di ſtagno; </s>
            <s xml:id="echoid-s8062" xml:space="preserve">
              <lb/>
            Le Girelle ſono ruote piccole, le ſtanghe, o Manouelle ſono de la ſpetie de razi
              <lb/>
            dele Ruote. </s>
            <s xml:id="echoid-s8063" xml:space="preserve">Ma tutte queſte coſe qualunque elle ſieno, o ſiano Ruote grandi
              <lb/>
              <note position="left" xlink:label="note-178-04" xlink:href="note-178-04a" xml:space="preserve">20</note>
            volte da gli huomini con lo andarui dentro, o ſiano Argani, o Viti, ne quali in-
              <lb/>
            ſtrumenti le ſtanghe, o Ruote piccole, o qual ſi voglia coſa ſimile, ſono la impor
              <lb/>
            tanza, la ragione del farle certo tutta naſce da principij de la Bilancia. </s>
            <s xml:id="echoid-s8064" xml:space="preserve">Dicono
              <lb/>
            che Mercurio per queſto piu che per altro fu tenuto diuino, che ſenza fare ge-
              <lb/>
            ſto alcuno di mani, pronuntiaua con le parole ſole, quelle coſe, che ei diceua, di
              <lb/>
              <note position="left" xlink:label="note-178-05" xlink:href="note-178-05a" xml:space="preserve">25</note>
            maniera, che egli era inteſo larghiſsimamente: </s>
            <s xml:id="echoid-s8065" xml:space="preserve">& </s>
            <s xml:id="echoid-s8066" xml:space="preserve">ſe bene io dubito di non po-
              <lb/>
            tere fare queſto, io me ne sforzerò nondimeno quanto piu potrò: </s>
            <s xml:id="echoid-s8067" xml:space="preserve">Concioſia,
              <lb/>
            che io mi ſono deliberato di parlare di queſte coſe, non come Mathematico,
              <lb/>
            ma come vno artier, & </s>
            <s xml:id="echoid-s8068" xml:space="preserve">non dire ſe non quello, che a me paia di non potere la-
              <lb/>
            ſciare in dietro. </s>
            <s xml:id="echoid-s8069" xml:space="preserve">Fa per imparare queſto di hauere in mano vno dardo: </s>
            <s xml:id="echoid-s8070" xml:space="preserve">Io
              <lb/>
              <note position="left" xlink:label="note-178-06" xlink:href="note-178-06a" xml:space="preserve">30</note>
            vorrei, che in eſſo tu vi conſideraſsi tre luoghi, i quali io chiamo punti, i duoi
              <lb/>
            eſtremi capi, cìoè il ſerro, & </s>
            <s xml:id="echoid-s8071" xml:space="preserve">la impennatura; </s>
            <s xml:id="echoid-s8072" xml:space="preserve">& </s>
            <s xml:id="echoid-s8073" xml:space="preserve">il terzo il laccio del mezzo;
              <lb/>
            </s>
            <s xml:id="echoid-s8074" xml:space="preserve">& </s>
            <s xml:id="echoid-s8075" xml:space="preserve">i duoi ſpatii, che ſono inſra duoi eſtremi capi, & </s>
            <s xml:id="echoid-s8076" xml:space="preserve">il laccio io gli chiamo rag-
              <lb/>
            gi. </s>
            <s xml:id="echoid-s8077" xml:space="preserve">Non voglio diſputare, perche coſi ſia; </s>
            <s xml:id="echoid-s8078" xml:space="preserve">Percioche il ſatto ſarà chia-
              <lb/>
            ro da la eſperienza. </s>
            <s xml:id="echoid-s8079" xml:space="preserve">Concioſia che ſe il laccio ſarà collocato nel mezzo
              <lb/>
              <note position="left" xlink:label="note-178-07" xlink:href="note-178-07a" xml:space="preserve">35</note>
            del dardo, & </s>
            <s xml:id="echoid-s8080" xml:space="preserve">il capo de la impennatura corriſponderà al peſo del capo del
              <lb/>
            ſerro, ſtaranno certamente amendue le teſte del dardo ſcambieuolmente v-
              <lb/>
            guali, & </s>
            <s xml:id="echoid-s8081" xml:space="preserve">bilanciate: </s>
            <s xml:id="echoid-s8082" xml:space="preserve">Ma ſe perauuentura la teſta del ferro ſarà piu graue,
              <lb/>
            l’altra de la impennatura ſarà ſuperata; </s>
            <s xml:id="echoid-s8083" xml:space="preserve">nondimeno in eſſo dardo ſi trouerà v-
              <lb/>
            no determinato luogo piu vicino a la teſta piu graue, nel quale riducendo tn
              <unsure/>
            il
              <lb/>
              <note position="left" xlink:label="note-178-08" xlink:href="note-178-08a" xml:space="preserve">40</note>
            laccio i peſi ſubito ſi bilanceranno l’vno l’altro; </s>
            <s xml:id="echoid-s8084" xml:space="preserve">& </s>
            <s xml:id="echoid-s8085" xml:space="preserve">queſto ſarà quello punto dal
              <lb/>
            quale queſto raggio maggiore ſoprauanza tanto il minore, quanto queſto pe-
              <lb/>
            ſo minore è auanzato dal maggiore. </s>
            <s xml:id="echoid-s8086" xml:space="preserve">Percioche coloro, che vanno dietro à
              <lb/>
            queſte coſe, hanno trouato, che i raggi diſuguali ſi aggiuſtano con peſi </s>
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