Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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          <pb o="85" file="0141" n="154" rhead="MATHEMATICA. LIB. I. CAP. XXI."/>
          <p>
            <s xml:id="echoid-s3555" xml:space="preserve">Orbis cum ſuſtentaculo ſuſtinetur ligno ED, in quo da-
              <lb/>
            tur lamina ferrea, cui cuſpis æneus b (fig 2.) </s>
            <s xml:id="echoid-s3556" xml:space="preserve">inſeritur. </s>
            <s xml:id="echoid-s3557" xml:space="preserve">Ita
              <lb/>
            cum pede Machinæ lignum hocce conjungitur, ut altitudo
              <lb/>
            ſulci c c cum altitudine laminarum R r congruat.</s>
            <s xml:id="echoid-s3558" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3559" xml:space="preserve">Hiſce ita diſpoſitis, liberrime cirea centrum horizonta-
              <lb/>
            liter orbis movetur, & </s>
            <s xml:id="echoid-s3560" xml:space="preserve">ut commode circumvolvatur, ei ad-
              <lb/>
            ditur, inter orbem & </s>
            <s xml:id="echoid-s3561" xml:space="preserve">ſulcum c e, rota minor, cujus ſectio
              <lb/>
            videtur in b b; </s>
            <s xml:id="echoid-s3562" xml:space="preserve">in eo loco ſuſtentaculum eſt polygonum, & </s>
            <s xml:id="echoid-s3563" xml:space="preserve">
              <lb/>
            congruit cum foramine in ipſa rota, quæ ope cochlearum
              <lb/>
            el, el; </s>
            <s xml:id="echoid-s3564" xml:space="preserve">firmatur. </s>
            <s xml:id="echoid-s3565" xml:space="preserve">Variæ tales rotæ minores requiruntur,
              <lb/>
            quarum peripheriæ, in fundo ſulci quo circumdantur, ſunt
              <lb/>
            inter ſe ut duo, tria, quatuor &</s>
            <s xml:id="echoid-s3566" xml:space="preserve">c; </s>
            <s xml:id="echoid-s3567" xml:space="preserve">rotæ omnium minimæ
              <lb/>
            diameter eſt circiter quinque pollicum.</s>
            <s xml:id="echoid-s3568" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s3569" xml:space="preserve">Orbis B, priori ſimilis, eodem modo, in parte oppoſita
              <lb/>
            pedis C circa centrum rotatur. </s>
            <s xml:id="echoid-s3570" xml:space="preserve">Parva tamen inter ambos
              <lb/>
            datur differentia; </s>
            <s xml:id="echoid-s3571" xml:space="preserve">hujus orbis ſuſtentaculi pars inferior et-
              <lb/>
            iam eſt perforata, ut i b (Fig. </s>
            <s xml:id="echoid-s3572" xml:space="preserve">4.)</s>
            <s xml:id="echoid-s3573" xml:space="preserve">; </s>
            <s xml:id="echoid-s3574" xml:space="preserve">commode nihilominus
              <lb/>
            circumvolvitur, in h applicatur lamina metallica perforata,
              <lb/>
            cui inſeritur tubus inhærens laminæ aliæ M, cujus ſectio
              <lb/>
            verticalis videtur in L, & </s>
            <s xml:id="echoid-s3575" xml:space="preserve">quæ in ligno
              <emph style="sc">E</emph>
            D pedis C hæret
              <lb/>
            in m. </s>
            <s xml:id="echoid-s3576" xml:space="preserve">Perforatur etiam lignum ED, in loco reſpondenti
              <lb/>
            foramini ſuſtentaculi, ita ut filum a ſuperficie orbis per to-
              <lb/>
            tum ſuſtentaculum & </s>
            <s xml:id="echoid-s3577" xml:space="preserve">lignum ED trajiciatur.</s>
            <s xml:id="echoid-s3578" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3579" xml:space="preserve">Rota ut b b, quæ huic orbi B additur, cum eo cohæret,
              <lb/>
            & </s>
            <s xml:id="echoid-s3580" xml:space="preserve">eſt æqualis minimæ illarum quæ orbi A ſeparatim anne-
              <lb/>
            ctuntur.</s>
            <s xml:id="echoid-s3581" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3582" xml:space="preserve">Orbes A & </s>
            <s xml:id="echoid-s3583" xml:space="preserve">B, aut conjunctim, autſeparatim, celeriter
              <lb/>
            circumvolvuntur, ope rotæ majoris & </s>
            <s xml:id="echoid-s3584" xml:space="preserve">verticalis Q, cujus
              <lb/>
            pars ſuperior in eodem datur plano horizontali cum rotis
              <lb/>
            minoribus ut b b. </s>
            <s xml:id="echoid-s3585" xml:space="preserve">Cum pede C conjungitur machina quæ
              <lb/>
            in fig. </s>
            <s xml:id="echoid-s3586" xml:space="preserve">5. </s>
            <s xml:id="echoid-s3587" xml:space="preserve">repræſentatur; </s>
            <s xml:id="echoid-s3588" xml:space="preserve">conſtat hæc ex plano ligneo, cui
              <lb/>
            perpendiculariter inhæret parallelopipedum, in cujus ſuperfi-
              <lb/>
            ciei ſuperioris extremitatibus verticaliter inſeruntur tro-
              <lb/>
            chleæ v, v, & </s>
            <s xml:id="echoid-s3589" xml:space="preserve">a latere in extremitate altera datur trochlea
              <lb/>
            tertia horizontalis t, cæteris pollice fere magis elevata. </s>
            <s xml:id="echoid-s3590" xml:space="preserve">Superfi-
              <lb/>
            cies ſuperior Machinæ, eſt in eodem plano horizontali cum </s>
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