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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            <s xml:id="echoid-s2318" xml:space="preserve">
              <pb o="16" file="0132" n="137" rhead="GEOMETRIA SVBTERRANEA."/>
            partem
              <emph style="sc">Voigtel</emph>
            cum curioſis communicauit Parte 4.
              <lb/>
            </s>
            <s xml:id="echoid-s2319" xml:space="preserve">p. </s>
            <s xml:id="echoid-s2320" xml:space="preserve">30. </s>
            <s xml:id="echoid-s2321" xml:space="preserve">ſq. </s>
            <s xml:id="echoid-s2322" xml:space="preserve">ex quibus nonnulla hic repetere et ſubinde illuſtrare
              <lb/>
            atque augere, operae pretium uidetur. </s>
            <s xml:id="echoid-s2323" xml:space="preserve">1. </s>
            <s xml:id="echoid-s2324" xml:space="preserve">Nota eſt uariabilis ma-
              <lb/>
            gnetis declinatio a meridiana, quae in diuerſis locis differt, et
              <lb/>
            eodem quoque loco, interiecto aliquo temporis interuallo, mutatur. </s>
            <s xml:id="echoid-s2325" xml:space="preserve">
              <lb/>
            Vnde ſaepe linea pyxidis corrigi debet ad ductum meridianae, de
              <lb/>
            qua dixi in inſtitutionibus aſtron. </s>
            <s xml:id="echoid-s2326" xml:space="preserve">ſphaer. </s>
            <s xml:id="echoid-s2327" xml:space="preserve">§. </s>
            <s xml:id="echoid-s2328" xml:space="preserve">29. </s>
            <s xml:id="echoid-s2329" xml:space="preserve">30. </s>
            <s xml:id="echoid-s2330" xml:space="preserve">Ceterum
              <lb/>
            illud experimentum hic inprimis commemorari meretur, quo in-
              <lb/>
            notuit, declinationem acus tam eſſe inſtabilem, ut quandoque in
              <lb/>
            locis, quae duobus ſaltem milliaribus diſtant, differat, quapropter
              <lb/>
            opera danda, ut prope cauernas, in quibus anguli compaſſo capti
              <lb/>
            ſunt, inſtrumento lineationis ichnographia fodinarum abſoluatur. </s>
            <s xml:id="echoid-s2331" xml:space="preserve">
              <lb/>
            v. </s>
            <s xml:id="echoid-s2332" xml:space="preserve">
              <emph style="sc">Voigtel</emph>
            p. </s>
            <s xml:id="echoid-s2333" xml:space="preserve">113.</s>
            <s xml:id="echoid-s2334" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2335" xml:space="preserve">2. </s>
            <s xml:id="echoid-s2336" xml:space="preserve">Impeditur uis acus magneticae frigore, quo quippe me-
              <lb/>
            talla conſtringuntur. </s>
            <s xml:id="echoid-s2337" xml:space="preserve">Quare antequam bieme in fodinas defera-
              <lb/>
            tur compaſſus, prius in conclaui calefacto temperandum frigus, et
              <lb/>
            uapor in eum incidens leniter detergendus eſt.</s>
            <s xml:id="echoid-s2338" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2339" xml:space="preserve">3. </s>
            <s xml:id="echoid-s2340" xml:space="preserve">Curandum, ut accurate in centro figatur ſtilus, cui
              <lb/>
            acus tanquam fulcro immineat, alias enim diuerſae fient diuerſis
              <lb/>
            in arcubus graduum indicationes.</s>
            <s xml:id="echoid-s2341" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2342" xml:space="preserve">4. </s>
            <s xml:id="echoid-s2343" xml:space="preserve">Tam fulcrum acus, quam conus uel pileolus aeneus,
              <lb/>
            in quem illud immittitur, magna induſtria poliri debent, ut eo li-
              <lb/>
            berior acui motus permittatur.</s>
            <s xml:id="echoid-s2344" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2345" xml:space="preserve">5. </s>
            <s xml:id="echoid-s2346" xml:space="preserve">Stili cuſpis nec acuminata nec obtuſa nimis ſit.
              <lb/>
            </s>
            <s xml:id="echoid-s2347" xml:space="preserve">Idem ſtilus, cochleae beneficio, intruditur, ut attolli aliquantum et
              <lb/>
            demitti acus queat.</s>
            <s xml:id="echoid-s2348" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2349" xml:space="preserve">6. </s>
            <s xml:id="echoid-s2350" xml:space="preserve">Inter acum et uitrum, quo tegitur, ſpatium iuſtum
              <lb/>
            interſit, neceſſum eſt. </s>
            <s xml:id="echoid-s2351" xml:space="preserve">Cum autem demitur, et iterum imponitur,
              <lb/>
            pyxidi uitrum, caue ne in acum cadat, et cuſpidis acumen
              <lb/>
            obtundat.</s>
            <s xml:id="echoid-s2352" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2353" xml:space="preserve">7. </s>
            <s xml:id="echoid-s2354" xml:space="preserve">Acus a ferro et ipſo magnete remoueatur. </s>
            <s xml:id="echoid-s2355" xml:space="preserve">Siqui-
              <lb/>
            dem utroque a ſolita directione auocatur, et ſi idem ſaepe contin-
              <lb/>
            gat, alacritas eiusdem impeditur. </s>
            <s xml:id="echoid-s2356" xml:space="preserve">Propterea etiam compaſſus in
              <lb/>
            ferrifodinis inutilis eſt.</s>
            <s xml:id="echoid-s2357" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s2358" xml:space="preserve">8. </s>
            <s xml:id="echoid-s2359" xml:space="preserve">Rudis et nondum elaborati magnetis poli ſic inueni-
              <lb/>
            untur. </s>
            <s xml:id="echoid-s2360" xml:space="preserve">Ponitur nempe aliquo loco uas rotundum, et ibidem immo-
              <lb/>
            tum relinquitur, in eoque, uel obſeruatione ſolis, quemadmodum </s>
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