Gravesande, Willem Jacob 's, An essay on perspective

Table of figures

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[Figure 1]
[2] fronting page 8Plate 1.Fig. 1.C A D B e E
[3] Fig. 2.M T O V R L A N D F S I H B G C
[4] Fig. 3.O b B F a A G
[5] Fig. 4.c C b d F B D a A G
[6] Plate 2.page 16.Fig. 5.@ O H F c d E D C G
[7] Fig. 6.E D O @ c F a b A C B G
[8] Fig. 7.D F H V C X a I B G E Z A
[9] Plate. 3.page 20Fig. 8.O Y D C X æ B E Z A
[10] Fig. 9.O I Y H G D V X a B E F C Z L A
[11] Plate 4.Page 24.Fig. 10.f F O G g V D N L a P E H I M A
[12] Plate 5.page 26.Fig. 11.O Y b X a E Z A B
[13] Fig. 12.M O Y F S C L D X a E B Z A
[14] Plate 6.page 28.Fig. 13.O D c b a g E G B A C
[15] Fig. 14.O b 1 2 3 a c 1 2 3 g D A C 3 1 2 2 1 3 B G
[16] page 28.Plate. 7Fig. 16Fig. 15O G F I Vl d c e m n b a h B A H M N C E P D L
[17] page 36.Plate 8Fig. 17O G F c d b a A B D C
[18] Page 36.Plate 9Fig. 18.G F C S V I E B A
[19] Fig. 19.O i M X L D @ b a
[20] Fig. 20.S x G n H S V D l R f Q m P t
[21] Fig. 21.I X f T L B N A C l M E F
[22] page 38Plate 10.Fig. 22.V F I N a G H M P D E B C L A
[23] Fig. 23.O F I H a G D E B C L A M
[24] Fig. 24.@ o f X a e A
[25] page 42Plate 11.Fig. 25.S F V M I N P H a L D E G C A B
[26] Fig. 26.Fig. 27.S V P Q R n l g h G H B N I A C M L
[27] page 46Plate 12.Fig. 28.
[28] Fig. 29.F S V q q q E L p p p I G H q D P n n n T R m m m C B Q A
[29] Fig. 30.O X E L N M G Z Y D
[30] Fig. 31.f 3 c l n m g 4
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              <pb o="vii" file="0015" n="15" rhead="The PREFACE."/>
            This I have done ſometimes; </s>
            <s xml:id="echoid-s118" xml:space="preserve">but it often
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            would have been very long and troubleſome.
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            </s>
            <s xml:id="echoid-s119" xml:space="preserve">In Geometry, the eaſieſt and ſhorteſt Way, is
              <lb/>
            not always that which leads to Diſcoveries.</s>
            <s xml:id="echoid-s120" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s121" xml:space="preserve">In the following Chapter, the Practice of Per-
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            ſpective upon the perſpective Plane, or Picture,
              <lb/>
            conſider’d as upright, is explain’d: </s>
            <s xml:id="echoid-s122" xml:space="preserve">Wherein,
              <lb/>
            among the different Ways laid down for the
              <lb/>
            Solution of general Problems, you will find
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            ſome effected by a Ruler only; </s>
            <s xml:id="echoid-s123" xml:space="preserve">ſo that after
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            ſome Preparations, all Kinds of Objects may
              <lb/>
            be drawn without Compaſſes, and that eaſier
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            than by the common Operations. </s>
            <s xml:id="echoid-s124" xml:space="preserve">In that
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            Problem, to find the Appearance of a Point
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            out of the Geometrical Plane, it is commonly
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            conſider’d as the Extremity of a Perpendicu-
              <lb/>
            lar, whoſe Repreſentation muſt first be found,
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            before that of the Point can be had. </s>
            <s xml:id="echoid-s125" xml:space="preserve">But here
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            we avoid this round-about Way, and ſhew how
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            to find the Appearance of the Point given,
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            without being obliged to find the Perſpective
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            of its Seat.</s>
            <s xml:id="echoid-s126" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s127" xml:space="preserve">As to the Appearance of a Cone and Cy-
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            linder, we determine the viſible Portions of
              <lb/>
            the Baſe, and by this means avoid the uſe-
              <lb/>
            leſs Operations which the common Way is
              <lb/>
            ſubject to. </s>
            <s xml:id="echoid-s128" xml:space="preserve">It is very difficult, if not impoſ-
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            ſible, to throw a Sphere into Perſpective, by
              <lb/>
            means of general Problems; </s>
            <s xml:id="echoid-s129" xml:space="preserve">and in the Re-
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            preſentation of the Torus of a Column, it </s>
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