DelMonte, Guidubaldo, Mechanicorvm Liber

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              <s id="id.2.1.175.1.2.1.0">PROPOSITIO XVIII. </s>
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              <s id="id.2.1.175.2.1.1.0">Si vtriuſq; duarum trochlearum binis orbicu
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              lis, quarum altera ſupernè à potentia ſuſtineatur,
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              altera verò infernè, ibiq; annexa, collocata fue­
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              rit, funis circumnectatur; altero eius extremo
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              alicubi, non autem ſuperiori trochleæ religato,
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              alteri verò pondere appenſo; quadrupla erit
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              ponderis potentia. </s>
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            <p id="id.2.1.175.3.0.0.0" type="main">
              <s id="id.2.1.175.3.1.1.0">Sit trochlea inferior, duos habens orbiculos,
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              quorum centra AB; ſit 〈qué〉 trochlea ſuperior
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              duos ſimiliter habens orbiculos, quorum cen­
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              tra CD; funiſq; EFGHKLMNOP ſit cir­
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              ca omnes orbiculos reuolutus, qui ſit religatus
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              in E; & in P appendatur pondus Q; ſitq; po­
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              tentia in R. </s>
              <s id="id.2.1.175.3.1.1.0.a">dico potentiam in R quadruplam
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              eſſe ponderis q. </s>
              <s id="N1536C">Cùm enim ſi duæ intelligan
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              tur potentiæ, vna in k, altera in D, potentia
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              in k ſuſtinens pondus Q fune k LMNOP æ­
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              qualis erit ponderi; erunt duæ ſimul potentiæ,
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              vna in D, altera in k, pondus Q ſuſtinentes,
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              triplæ eiuſdem ponderis. </s>
              <s id="id.2.1.175.3.1.2.0">Potentia verò in C
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              dupla eſt potentiæ in k, & per conſequens pon
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              deris Q; idem enim eſt, ac ſi in k appenſum eſ
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              ſet pondus æquale ponderi Q, cuius dupla eſt
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              potentia in C; duæ igitur potentiæ in DC qua­
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              druplæ ſunt ponderis q. </s>
              <s id="N1538B">& cùm potentia in R
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              orbiculis ſuſtineat pondus Q, erit
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              in R,
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              ac ſi duæ eſſent potentiæ, vna in D, altera in C,
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              & vtræq; ſimul pondus Q ſuſtinerent. </s>
              <s id="id.2.1.175.3.1.3.0">ergo po­
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              tentia in R quadrupla eſt ponderis q. </s>
              <s id="N1539C">quod
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              oportebat demonſtrare.
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