Weidler, Johann Friedrich, Jo. Friderici Weidleri Tractatus de machinis hydraulicis toto terrarum orbe maximis Marlyensi et Londinensi et aliis rarioribus similibus in quo mensurae prope ipsas machinas notatae describuntur, et de viribus earum luculenter disseritur

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          <head xml:id="echoid-head37" xml:space="preserve">PRAEFATIO.</head>
          <p style="it">
            <s xml:id="echoid-s1951" xml:space="preserve">Ad artes inueniendas et ampliſi-
              <lb/>
            candas, nulla re magis, quam
              <lb/>
            ſpe utilitatis, animi mortalium
              <lb/>
            inflammantur. </s>
            <s xml:id="echoid-s1952" xml:space="preserve">Teſtis aegyptus,
              <lb/>
            in qua nili inundationes geome-
              <lb/>
            triam pepererunt. </s>
            <s xml:id="echoid-s1953" xml:space="preserve">Et in germa-
              <lb/>
            nia, poſtquam abditae olim omnis generis metallorum
              <lb/>
            uenae, abbinc pluribus ſeculis detectae et perueſtiga-
              <lb/>
            tae ſunt, occaſio ſuppeditata eſt, geometriam ad
              <lb/>
            ſpecus ſubterraneos metiendos accommodandi. </s>
            <s xml:id="echoid-s1954" xml:space="preserve"> Haec ars etiamſi inter noſtros foſſores egregie flore-
              <lb/>
            at, tamen cum, ob faſtidia et pericula, quibus ſtipa-
              <lb/>
            ta eſt, plerumqne tantum tractetur a pragmaticis,
              <lb/>
            mathematicarum ſcientiarum minus gnaris, et pro-
              <lb/>
            pterea ab ipſis obſcurius nec ſolide ſatis tradatur,
              <lb/>
            feci periculum, eiusdem paulo accuratius formandae
              <lb/>
            et ex purae matheſeos principiis demonſtrandae.</s>
            <s xml:id="echoid-s1955" xml:space="preserve"/>
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