DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.18826#0108
ON PERSPECTIVE.
[LECT. II.
PLATE XXVII.
No. L As all horizontal and vertical planes, and
objects, in every fituation, however diverfified, fol-
low the rules already laid down ; we prefume what
has been faid may fufnce to explain the method of
reprefenting them in perfpective: we proceed now
to illuftrate the nature of planes not perpendicular,
or parallel, to the picture, but inclined to it.
In this example, C is the center of the picture,
C I its diftance, H L the vanifhing line of the ground
plane R Q,. The line R * marks the inclination of
the plane to be reprefented, with the picture (and
is here fuppofed 70 degrees.) Through C, draw
C G, parallel to the line R *, and of equal length to
the diftance CI; perpendicular to C G, erect CS:
through S, draw A S B parallel to C G; this is the
vanifhing line for the plane propofed, S its center
and S G equal to its diftance.
This object has faces in three different inclina-
tions ; firft, that lying on the ground, which accord-
ingly vanifhes in the vanifhing points to the ground,
as rf/and ek\ fecondly, other faces perpendicular
to the ground, aseklg-, thirdly, an inclined face
not parallel to either, as dflg; which is our im-
mediate object. EDFis an original plan, whofe
lines being continued ftrike the ground line in R,
and Q, &c. Rule R to L, being coincident with
the ground plane; and Q, and its parallel to H; by
which we obtain df for the reprefentation of DF:
and by the fame means, we obtain e k} which now
completes the perfpective plan of the object. From
d draw d B; from / draw f B : erect on e a per-
pendicular, which cuts d B in I; and from / rule IL,
CUtting/B in g\ which completes the figure.
M K Shews the fide-elevation of this object.
PLATE
[LECT. II.
PLATE XXVII.
No. L As all horizontal and vertical planes, and
objects, in every fituation, however diverfified, fol-
low the rules already laid down ; we prefume what
has been faid may fufnce to explain the method of
reprefenting them in perfpective: we proceed now
to illuftrate the nature of planes not perpendicular,
or parallel, to the picture, but inclined to it.
In this example, C is the center of the picture,
C I its diftance, H L the vanifhing line of the ground
plane R Q,. The line R * marks the inclination of
the plane to be reprefented, with the picture (and
is here fuppofed 70 degrees.) Through C, draw
C G, parallel to the line R *, and of equal length to
the diftance CI; perpendicular to C G, erect CS:
through S, draw A S B parallel to C G; this is the
vanifhing line for the plane propofed, S its center
and S G equal to its diftance.
This object has faces in three different inclina-
tions ; firft, that lying on the ground, which accord-
ingly vanifhes in the vanifhing points to the ground,
as rf/and ek\ fecondly, other faces perpendicular
to the ground, aseklg-, thirdly, an inclined face
not parallel to either, as dflg; which is our im-
mediate object. EDFis an original plan, whofe
lines being continued ftrike the ground line in R,
and Q, &c. Rule R to L, being coincident with
the ground plane; and Q, and its parallel to H; by
which we obtain df for the reprefentation of DF:
and by the fame means, we obtain e k} which now
completes the perfpective plan of the object. From
d draw d B; from / draw f B : erect on e a per-
pendicular, which cuts d B in I; and from / rule IL,
CUtting/B in g\ which completes the figure.
M K Shews the fide-elevation of this object.
PLATE