Gravesande, Willem Jacob 's
,
An essay on perspective
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The PREFACE.
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">The Practice of Perſpective may be made
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eaſy, by the Three following Things in this
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Treatiſe: </
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xml:space
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">In giving ſeveral new
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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: </
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<
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xml:space
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">And the
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Reaſon why we have laid down ſeveral So-
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lutions, is, becauſe the ſame Way is not always
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equally convenient in all Caſes; </
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<
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xml:space
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">whence it is
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neceſſary to have ſeveral, that ſo we may
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chuſe one beſt ſuiting our Purpoſe. </
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general Methods, which have been us’d hi-
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therto, not being practicable on ſome particu-
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lar Occaſions; </
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ded others to them; </
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xml:space
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">which are indeed more
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difficult, but (in ſome Caſes) there is an ab-
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ſolute Neceſſity for them. </
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<
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ry difficult to reſolve a particular Problem,
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by means of general ones; </
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thought it convenient to give a particular So-
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lution thereof.</
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<
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becomes indeed more difficult; </
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<
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">but the Diſ-
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advantage is well recompenſed by the Faci-
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cility of the Practice, which we have entire-
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ly had in view. </
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<
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xml:space
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">It is true, that a few ge-
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neral Rules do not ſo much burthen the Me-
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mory; </
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<
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">but when one has ſeveral general
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ones, and alſo particular ones, by them we
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can abridge Matters. </
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