Full text: Gravesande, Willem Jacob: An essay on perspective

An ESSAY their accidental Point F, afterwards find the Re-
preſentation of their Baſes: This being done,
denote the Appearances of the Lines wherein
the Shores meet the Wall, upon the Perſpective
of the Wall; the Appearances here are the
Lines p t, r s, which repreſent Lines parallel to
the Geometrical Plane, from the Suppoſition,
that the Shores are parallel between themſelves,
and their Baſes equally diſtant from the Wall. Finally, draw Lines from the Angles of the Re-
preſentations 1 2 3 4, to the Point F, which
will be terminated by their Interſections with
p t and r s, and will give the Appearances ſought,
as you ſee in the Figure.


Fig. 38.

108. Example II.

To throw ſeveral parallel Roofs of a Houſe into

Having found the accidental Points G and Q
of the ſaid Roofs, in the Repreſentation of
the Wall ſuſtaining them, denote the Points
a b c d, wherein the ſaid Roofs meet the Wall: Then from the Point G draw Lines through the
Points a b c; and from the Point Q others to
the Points b c d; theſe Lines by their mutual
Interſection will determine each other, and give
the Repreſentations ſought.


Fig. 39.

109. Conclusion .

74. From what has been already ſaid, it will
not be difficult to throw any Objects whatſoever
into Perſpective. But ſince it is very difficult,
and indeed impoſſible for a Painter to make a
Deſign entirely according to the Rules we have
preſcribed; the Number of Points to be found
being almoſt infinite: therefore the Figures


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