Gravesande, Willem Jacob 's, An essay on perspective

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          <pb o="ix" file="0017" n="17" rhead="The PREFACE."/>
          <p style="it">
            <s xml:id="echoid-s145" xml:space="preserve">In the Eighth Chapter, are laid down
              <lb/>
            ſome Mechanical ways for making the Uſe of
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            Perſpective eaſy, by means of Rulers and
              <lb/>
            Threads, (eaſily to be gotten by any body,
              <lb/>
            and not difficult to be put in practice) they
              <lb/>
            being eaſier to uſe than any of the Inſtru-
              <lb/>
            ments that have hitherto been invented for
              <lb/>
            this Purpoſe.</s>
            <s xml:id="echoid-s146" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s147" xml:space="preserve">The laſt Chapter ſhews the Uſefulneſs of
              <lb/>
            Perſpective in Dialling.</s>
            <s xml:id="echoid-s148" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s149" xml:space="preserve">Such is the Plan of this ſinall Work;
              <lb/>
            </s>
            <s xml:id="echoid-s150" xml:space="preserve">wherein I have not ſo much endeavour’d to
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            advance Curioſities, as Things of real Uſe; </s>
            <s xml:id="echoid-s151" xml:space="preserve">
              <lb/>
            hoping that, without making a Shew of Skill
              <lb/>
            ill beſtow’d, I ſhall make my Book good enough,
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            if by its Uſe I make it neceſſary. </s>
            <s xml:id="echoid-s152" xml:space="preserve">For which
              <lb/>
            Reaſon, I have endeavour’d to lay down the
              <lb/>
            whole, ſo as to be underſtood by thoſe who
              <lb/>
            have only read the Elements of Euclid. </s>
            <s xml:id="echoid-s153" xml:space="preserve">And
              <lb/>
            tho’ I have deviated from this Rule in ſome
              <lb/>
            few Place; </s>
            <s xml:id="echoid-s154" xml:space="preserve">they are printed in Italick, that
              <lb/>
            ſo they may be paſs’d over without any Hin-
              <lb/>
            drance to the Learner.</s>
            <s xml:id="echoid-s155" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s156" xml:space="preserve">Here I muſt not forget to mention, that in
              <lb/>
            Reviſing this Eſſay, I had the Happineſs of
              <lb/>
            meeting with an able Painter; </s>
            <s xml:id="echoid-s157" xml:space="preserve">who has ſe-
              <lb/>
            r
              <unsure/>
            iouſly conſider’d every Thing of his Profeſ-
              <lb/>
            ſion, neceſſary to be known, among </s>
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