Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

Table of figures

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              inferioris trochleæ,
                <expan abbr="quandoquidẽ">quandoquidem</expan>
                <expan abbr="nõ">non</expan>
                <expan abbr="vterq.">vterque</expan>
              idem genus ve­
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              ctis exprimit, aut participat. </s>
              <s id="N152A4">Si igitur
                <expan abbr="orbiculũ">orbiculum</expan>
              trochleæ ſu­
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              perioris, hoc eſt ſupernè appenſæ conſideremus, eam ratio­
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              nem vèctis obtinere comperiemus, quam participat etiam
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              libra æqualium brachiorum, nempe, cuius fulcimentum in­
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              ter pondus, & potentiam collocatur. </s>
              <s id="N152B3">Porrò diameter or­
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              biculi orizonti parallela FG longitudinem vectis refert,
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              axiculus verò qui in centro eſt vbi H, fulcimentum. </s>
              <s id="N152BA">Deinde
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              diametri extremum F à quo pondus cum inferiori trochlea
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              per funem propendet, vectis extremum exprimit, cui onus
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              eſt alligatum. </s>
              <s id="N152C3">Alterum verò diametri extremum G, vectis
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              extremum deſignat, cui virtus mouentis applicatur. </s>
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              <s id="N152CA">At ſi orbiculum inferioris trochleæ conſiderare velimus,
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              aliam in eo vectis ratione deprehendemus; illam vtique
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              cuius fulcimentum conſtituitur in altero extremo, pondus
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              verò in medio, vt 1. par. </s>
              <s id="N152D3">tex. 8. Additione 1 explicuimus.
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              </s>
              <s id="N152D9">Etenim ex duobus eius diametri extremis IK, alterum nem­
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              pe K fulcitur à fune, cui veluti immobiliter innititur, eo
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              quod ipſa ſuſtineatur in D. </s>
              <s id="N152E1">Alterum verò extremum I ſur­
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              ſum attollitur verſus F per motum eiuſdem funis ibi vim
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              præcipuam imprimentis. </s>
              <s id="N152E8">Pondus denique C propendet ex
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              medio vbi L,
                <expan abbr="ibiq.">ibique</expan>
              propterea grauitat inter fulcimentum, &
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              potentiam attollentem. </s>
              <s id="N152F3">Ex quibus conſtat,
                <expan abbr="vtriuſq;">vtriuſque</expan>
              trochleæ
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              orbiculos vectis rationem habere, ſed non eandem. </s>
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            <p id="N152FC" type="main">
              <s id="N152FE">Quod ſi quæras quæ nam ex his duabus trochleis maius
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              potentiæ mouenti auxilium præſtet. </s>
              <s id="N15303">Reſpondetur, ſuperio­
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              rem trochleam non tam auxilium, quàm commoditatem,
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              ac facilitatem ad trahendum illi præbere. </s>
              <s id="N1530A">Vt enim patet ex
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              Guido Vbaldo de trochlea propoſitione prima, beneficio
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              ipſius trochleæ ſuperioris ſupernè videlicet appenſæ quan­
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              do potentia æqualis eſt ponderi inferius alligato, nullatenus
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              eleuare illud poterit, cum ita ſe habeat, ac ſi aliud eſſet ap­
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              penſum pondus, æquale ponderi prædicto cum æquali di­
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              ſtantia à centro, ſiue axiculo, circa quem diameter orbiculi
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              non ſecus ac libra conuertitur, vt clarius videre eſt in hac
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              figura, in qua linea AB diametrum referat orbiculi ABC </s>
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