3615on PERSPECTIVE.
to the Eye.
Now, as in the latter Situation,
Repreſentatious are drawn upon the Face of the
Perſpective Plane next to the Object, the Per-
ſpective Plane lying down upon its other Face;
what ought to be on the Right Hand, appears on
the Left; and that on the Left, appears on the
Right; producing exactly the ſame Effect, as
looking thro’ the Back-ſide of a Paper, at a Pi-
cture drawn thereon.
Repreſentatious are drawn upon the Face of the
Perſpective Plane next to the Object, the Per-
ſpective Plane lying down upon its other Face;
what ought to be on the Right Hand, appears on
the Left; and that on the Left, appears on the
Right; producing exactly the ſame Effect, as
looking thro’ the Back-ſide of a Paper, at a Pi-
cture drawn thereon.
Yet, notwithſtanding this Deficiency, we pre-
fer the latter way of the Perſpective Plane’s ly-
ing down to the former, for the following Rea-
ſons.
fer the latter way of the Perſpective Plane’s ly-
ing down to the former, for the following Rea-
ſons.
1.
When the Perſpective Plane lies down in
the former manner, it lies upon the Part of the
Geometrical Plane wherein Figures have been
drawn; which, together with the new Lines that
muſt be drawn, cauſes a very great Confuſion,
and always obliges one to copy his Work. An
Inconveniency which the latter Method is ſel-
dom ſubject to.
the former manner, it lies upon the Part of the
Geometrical Plane wherein Figures have been
drawn; which, together with the new Lines that
muſt be drawn, cauſes a very great Confuſion,
and always obliges one to copy his Work. An
Inconveniency which the latter Method is ſel-
dom ſubject to.
Finally, The Default we have obſerv’d, may
ſeveral ways be remedied. For, in drawing up-
on the Geometrical Plane, we need but place
that on the Right Hand which we have a mind
ſhould appear on the Left; or if the Geometri-
cal Plane be drawn upon Paper, it may be oil’d,
or dipp’d in Varniſh, which will render it tran-
ſparent; and then the Back-ſide of the Paper
may be thrown into Perſpective.
ſeveral ways be remedied. For, in drawing up-
on the Geometrical Plane, we need but place
that on the Right Hand which we have a mind
ſhould appear on the Left; or if the Geometri-
cal Plane be drawn upon Paper, it may be oil’d,
or dipp’d in Varniſh, which will render it tran-
ſparent; and then the Back-ſide of the Paper
may be thrown into Perſpective.