DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.18826#0072
32 on perspective. [lect. IIc
your candour, the Diftance for which a picture is con-
ftrucled, and from which it mould be viewed,—fome-
what like rules, or an advance towards them, may be
attained : it is, I- fay, poffible to fuggeft regulations
for the Distance of the picture.
Perfpeciive fuppofes, that, objects may be fituated
fo clofe to a fpecrator, that he cannot fee them; and,
In fact, our daily practice toward objects of any conH-
derable magnitude, juftifles this fuppofition ; fmce we
conftantly recede from fuch objects, to a proper dif-
tance at which to view them, as obferved on a former
occafion. An additional remark may confirm this idea.
I conceive it needs little proof, that the boundary
of the fpace of vifion, or of the rays received by the
eye, is a circle ; for fince the orifice of the pupil is cir-
cular, it cannot well be otherwife. Now as the two
outlines, or boundaries, of the vifual ravs from the
two eyes, at a little diftance from the perfon, have
precifely the effect of one only; it appears clearly,
that nature never intended any object, whofe diameter
is too large to be comprifed within the fpace of that
circle, mould be furveved clofer than that flation,
which produces the effect of compounding thefe circles.
In fact, the internal humors of the eye are obliged
to affume a form different from their ufual one, when
they with to accommodate themfelves to the infpec-
tion of objects introduced within this diftance; which,
perhaps after all, are ufually feen with one eye (the
other becoming quiefcent), or are at lea ft, beft feen
with one eye only.
4 A fimijar
your candour, the Diftance for which a picture is con-
ftrucled, and from which it mould be viewed,—fome-
what like rules, or an advance towards them, may be
attained : it is, I- fay, poffible to fuggeft regulations
for the Distance of the picture.
Perfpeciive fuppofes, that, objects may be fituated
fo clofe to a fpecrator, that he cannot fee them; and,
In fact, our daily practice toward objects of any conH-
derable magnitude, juftifles this fuppofition ; fmce we
conftantly recede from fuch objects, to a proper dif-
tance at which to view them, as obferved on a former
occafion. An additional remark may confirm this idea.
I conceive it needs little proof, that the boundary
of the fpace of vifion, or of the rays received by the
eye, is a circle ; for fince the orifice of the pupil is cir-
cular, it cannot well be otherwife. Now as the two
outlines, or boundaries, of the vifual ravs from the
two eyes, at a little diftance from the perfon, have
precifely the effect of one only; it appears clearly,
that nature never intended any object, whofe diameter
is too large to be comprifed within the fpace of that
circle, mould be furveved clofer than that flation,
which produces the effect of compounding thefe circles.
In fact, the internal humors of the eye are obliged
to affume a form different from their ufual one, when
they with to accommodate themfelves to the infpec-
tion of objects introduced within this diftance; which,
perhaps after all, are ufually feen with one eye (the
other becoming quiefcent), or are at lea ft, beft feen
with one eye only.
4 A fimijar