Gravesande, Willem Jacob 's, An essay on perspective

Table of figures

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[41] page 64Plate. 18.d v
[42] Fig. 41E b a G F H C B A D
[43] Fig. 42G Q A M I S E H T B L Z F P a X Y N C D R O
[44] page 68Plate. 19Fig. 43B D E a G H I C F L
[45] Fig. 44O V X S H I T
[46] Fig. 45Q F V X S a H B C D E L M P T A
[47] page 72Plate. 20Fig. 46V I X a E M P A T
[48] Fig. 47V F X a Q G H D N A T R
[49] Page 34.Plate. 21Fig. 48F O D X S b a G N A E T B P C
[50] Fig. 49H F O D G X a M N L R Q
[51] Page 36Plate 22Fig. 50O R E G N S M
[52] Fig. 51I H T a X
[53] Fig. 52C D X I H G a F E L b T
[54] Fig. 53H I F T x d X L B C
[55] page 64.Plate 23.Fig. 54O M P Q t A X x Q R N
[56] Fig. 55G F b T L a
[57] Fig. 56I F a X b E T C P
[58] page 66.Plate. 24.Fig. 57E A Z C P B
[59] Fig. 58F O D I a b
[60] Fig. 59F E Z C A B
[61] page 88.Plate. 25.Fig. 60O G F f Z L R P D I T S M a Q E R H N A C B
[62] Plate 26Fig. 61O I F T N S Q S H E R M A
[63] Fig. 62C D S Q L C D R P H
[64] page 96.Plate. 27Fig. 63D E C F M H I G P A Q N
[65] Fig. 64X S D E T C R L F H I G P M B O V Q N
[66] page 98.Plate. 28Fig. 65L M F G D H C E I A B
[67] Fig. 66A B VII VIII IV V H C VI VI P V VII IV S VIII E O I III II I XII XIX IX F D
[68] page 100Plate. 29Fig. 675 6p 7 8 9 10 S V VI VII VIII IX X o XI ll l
[69] Fig. 68c P G e o Q
[70] Fig. 69P c G o e Q
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          <pb o="v" file="0013" n="13" rhead="The PREFACE."/>
          <p style="it">
            <s xml:id="echoid-s82" xml:space="preserve">The Practice of Perſpective may be made
              <lb/>
            eaſy, by the Three following Things in this
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            Treatiſe: </s>
            <s xml:id="echoid-s83" xml:space="preserve">Viz. </s>
            <s xml:id="echoid-s84" xml:space="preserve">1. </s>
            <s xml:id="echoid-s85" xml:space="preserve">In giving ſeveral new
              <lb/>
            and eaſier Ways (than thoſe commonly uſed)
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            of ſolving the moſt general Problems upon
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            which the whole Practice is founded: </s>
            <s xml:id="echoid-s86" xml:space="preserve">And the
              <lb/>
            Reaſon why we have laid down ſeveral So-
              <lb/>
            lutions, is, becauſe the ſame Way is not always
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            equally convenient in all Caſes; </s>
            <s xml:id="echoid-s87" xml:space="preserve">whence it is
              <lb/>
            neceſſary to have ſeveral, that ſo we may
              <lb/>
            chuſe one beſt ſuiting our Purpoſe. </s>
            <s xml:id="echoid-s88" xml:space="preserve">2. </s>
            <s xml:id="echoid-s89" xml:space="preserve">The
              <lb/>
            general Methods, which have been us’d hi-
              <lb/>
            therto, not being practicable on ſome particu-
              <lb/>
            lar Occaſions; </s>
            <s xml:id="echoid-s90" xml:space="preserve">to remedy this, we have ad-
              <lb/>
            ded others to them; </s>
            <s xml:id="echoid-s91" xml:space="preserve">which are indeed more
              <lb/>
            difficult, but (in ſome Caſes) there is an ab-
              <lb/>
            ſolute Neceſſity for them. </s>
            <s xml:id="echoid-s92" xml:space="preserve">3. </s>
            <s xml:id="echoid-s93" xml:space="preserve">When it is ve-
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            ry difficult to reſolve a particular Problem,
              <lb/>
            by means of general ones; </s>
            <s xml:id="echoid-s94" xml:space="preserve">then we have
              <lb/>
            thought it convenient to give a particular So-
              <lb/>
            lution thereof.</s>
            <s xml:id="echoid-s95" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s96" xml:space="preserve">By this means, the Study of Perſpective
              <lb/>
            becomes indeed more difficult; </s>
            <s xml:id="echoid-s97" xml:space="preserve">but the Diſ-
              <lb/>
            advantage is well recompenſed by the Faci-
              <lb/>
            cility of the Practice, which we have entire-
              <lb/>
            ly had in view. </s>
            <s xml:id="echoid-s98" xml:space="preserve">It is true, that a few ge-
              <lb/>
            neral Rules do not ſo much burthen the Me-
              <lb/>
            mory; </s>
            <s xml:id="echoid-s99" xml:space="preserve">but when one has ſeveral general
              <lb/>
            ones, and alſo particular ones, by them we
              <lb/>
            can abridge Matters. </s>
            <s xml:id="echoid-s100" xml:space="preserve">And this Method </s>
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