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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        <div xml:id="echoid-div76" type="section" level="1" n="56">
          <pb o="20" file="0136" n="141" rhead="GEOMETRIA SUBTERRANEA."/>
        </div>
        <div xml:id="echoid-div78" type="section" level="1" n="57">
          <head xml:id="echoid-head74" xml:space="preserve">CONSECTARIVM.</head>
          <p>
            <s xml:id="echoid-s2445" xml:space="preserve">37. </s>
            <s xml:id="echoid-s2446" xml:space="preserve">Vſus huius inſtrumenti eſt, ut beneficio regulae mobilis
              <lb/>
            ſpecus cuiusdam directio in mundi plagam, ſiue diſceſſus
              <lb/>
            a linea meridiana, inueſtigetur, et quia in tali pyxide regula
              <lb/>
            horam alicuius cauernae axi debitam monſtrat, non opus
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            eſt plagarum ortus et occaſus permutatione; </s>
            <s xml:id="echoid-s2447" xml:space="preserve">adeoque hic
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            compaſſus ſimilis eſt uulgarium, qui circumferuntur, et tantum
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            diuiſione peripheriae diſtinguitur. </s>
            <s xml:id="echoid-s2448" xml:space="preserve">Aetate Agricolae, ſeculo
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            16, eiusmodi compaſſum prae ceteris fuiſſe in uſu, apparet ex
              <lb/>
            libro s. </s>
            <s xml:id="echoid-s2449" xml:space="preserve">eiusdem de re metallica, p. </s>
            <s xml:id="echoid-s2450" xml:space="preserve">105.</s>
            <s xml:id="echoid-s2451" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div79" type="section" level="1" n="58">
          <head xml:id="echoid-head75" xml:space="preserve">SCHOLION.</head>
          <p style="it">
            <s xml:id="echoid-s2452" xml:space="preserve">38. </s>
            <s xml:id="echoid-s2453" xml:space="preserve">Cum uero breuis acus magnetica non ſatis accurate indicet
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            in circulo horario punctum, finitores aliam compaſſi iacentis
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            formam, quae figura 15. </s>
            <s xml:id="echoid-s2454" xml:space="preserve">ob oculos ponitur, inuenerunt. </s>
            <s xml:id="echoid-s2455" xml:space="preserve">Nimirum
              <lb/>
              <note position="left" xlink:label="note-0136-01" xlink:href="note-0136-01a" xml:space="preserve">Figur 15.</note>
            ex ligno duriore conficitur rectangulum, 6. </s>
            <s xml:id="echoid-s2456" xml:space="preserve">digitos longum, 1. </s>
            <s xml:id="echoid-s2457" xml:space="preserve">dig.
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            </s>
            <s xml:id="echoid-s2458" xml:space="preserve">altum, et in medio eiusdem, pro acu locanda, cauum orbiculare pa-
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            ratur, cuius diameter eſt 2 {1/2} digitorum. </s>
            <s xml:id="echoid-s2459" xml:space="preserve">Circa hoc cauum foramen
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            orbiculus aeneus tranſuerſariis diametris firmatur, in quo horarum
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            diuiſiones et numeri ſcripti ſunt. </s>
            <s xml:id="echoid-s2460" xml:space="preserve">In centro autem harum diametro-
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            rum, ſtilus figitur, intra regulae MNO medium inſerendus,
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            ut circa hunc ſtilum, ueluti circa axem ſuum, regula aenea, diame-
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            tro compaſſi panlo maior, altero extremo unco praedita, uoluatur. </s>
            <s xml:id="echoid-s2461" xml:space="preserve">
              <lb/>
            Ita enim fiet, ut etiam hoc organo reperiantur ſpecuum ſubterra-
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            neorum directiones, quando funiculus parietibus fodinae parallelus,
              <lb/>
            unco M regulae annexus, una ducit regulam, ut angulus, quem
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            cum linea meridiana funiculus efficit, innoteſcat, Si hoc inſtru-
              <lb/>
            mentum fulcro inſtruatur, erit aa praxin tanto commodius.</s>
            <s xml:id="echoid-s2462" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div81" type="section" level="1" n="59">
          <head xml:id="echoid-head76" xml:space="preserve">DEFINITIO XVII.</head>
          <p>
            <s xml:id="echoid-s2463" xml:space="preserve">39.</s>
            <s xml:id="echoid-s2464" xml:space="preserve">Circuli horarii (Stunden - Scheiben) ſunt orbes aenei,
              <lb/>
              <note position="left" xlink:label="note-0136-02" xlink:href="note-0136-02a" xml:space="preserve">Figur. 16.</note>
            diametri 4. </s>
            <s xml:id="echoid-s2465" xml:space="preserve">digitorum, habentes peripheriam in ho-
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            ras, conſueta menſoribus ratione, diuiſam. </s>
            <s xml:id="echoid-s2466" xml:space="preserve">Inſtruuntur
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            praeterea ſinguli duabus laminis recuruis, </s>
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